When To Shift Gears For The Fastest Acceleration

[@eviltyres60]

here's a trick, once you're in sixth, shift to the gear marked "R". this engages "Race" gear which will maximize speed.

[@747Durango]

Dont forget to pull up the ring to engage hyper-mode!

[@Noah-vj9vy]

Should have researched this method before trying it today :/

[@twobunz6594]

This joke is played out

[@Lurod_]

LMAO

[@ΣταυρόπουλοςΔημήτρης]

i thought r was for rocket gear:(

[@Kyegar]

I shift when I hear the bald eagles scream.

[@thebatlemasterdave]

murica!!!

[@elgatovolador3226]

hahaah so patriotic!

[@Gumbile]

to much 1320

[@EngineeringExplained]

Let freedom ring!

[@Lauren_C]

Is it OK to shift past redline, for example, a car with a redline of 6500 rpm, but the cutoff is at 7100?

[@TG93Handle]

Armed with this knowledge my civic can best anything.

[@gman3563]

Gamerred you didn't need to know this.... VTECH bests everything anyways...

[@markitoxi]

Now you can outrun some other civics yay!

[@jtisme17racing61]

Now i can beat that enzo....again

[@emperorSbraz]

swap 4th and 5th gears from an ITR and you're good to go. :)

[@MidnightMechanic]

Pffft, my Ariel Atom would beat your Civic, it's lighter. ;)

[@tor3040]

Every time I shift, I run through all these calculations in my head.

[@dyson9422]

If that is the case you are making the same mistakes. It is a good approximation but neglected the torque required to accelerate the engine and the rest of the drive chain.

[@ian_dot_com]

​@@dyson9422 it was a joke my friend

[@brentanco]

can you make a video on why mustangs always crash into crowds? I've been studying this for a awhile but I just can't find the answer. :(

[@EngineeringExplained]

Probably because crowds won't stop talking about Mustangs crashing into crowds.

[@HudsonStronck]

you see the one at houston cars and coffee the other day?

[@HudsonStronck]

MRios1128 same...

[@spencervalek2173]

basically what happens is the driver is not used to so much power, tries to do a burnout/power slide, panics, hits the breaks shifting weight off of the rear wheels and makes the slide worse

[@ryanrohauer5940]

ego and traction control function disabled.

[@TheCarPassionChannel]

Awesome video as always! I think shifting early to make more power is probably more common with cars that come with very small factory turbochargers that make a lot of midrange torque but fall off pretty hard between 6000-7000.

[@Ls3juju]

I was doing that in my twin turbo charged 335i and today I raced my buddys cammed 3v I thought I was gonna get walked similar to the last runs but I started to shift at 7k and I beat him top end my car is stock

[@krazyelr]

should do one video shifting for best fuel economy possible

[@jrchajrchasgscs1248]

Eddie Linares thats just shifting lowest rpm possible

[@krazyelr]

ya, but would just like the hear the math behind it. That's why I like to watch these videos

[@Klikkitse]

Oh absolutely! I would love to be able to do that math for my car too. It's a really small turbo diesel and could potentially get great consumption figures (3.4L/100km) but I've yet to hit those numbers. Perhaps an episode on this would let me understand my engine a little bit better.

[@mibars]

My Subaru is really unhappy at below 2000rpm, vibrating and stuff... Maybe that's part of the reason whyEJ205 has such terrible gas mileage? :)

[@mirceahorvath4285]

@klikkitse Highest gear on cruise control just below turbo's entry point(depending on the car it should be under 2000rpm or maybe a bit lower, like 1500rpm). Drive your car like that on a cool day(10-15°C) on the highway and you will get that consumption. But don't do that too much, because in my opinion it is not really healthy for the car.

[@25Newengland]

its hard for me to listen to the video and read the comments at the same time

[@scottjohnson8364]

Welcome to adhd

[@StrongestKryptonian]

Same 😂😂😂

[@DomitionX]

There should be a kickstarter to get EE a bigger whiteboard.

[@EngineeringExplained]

Or maybe a GoFundMe so you can have a larger screen. :P

[@MaacMedia]

the savagery!!

[@adrenalinejunky6553]

DomitionX dammm 😂😂😂 roasted

[@DomitionX]

XD Maybe a patreon for a yellow dry-erase marker for that sexy S2000

[@EngineeringExplained]

Ha! I've got one, but I only recommend it if you use AdBlock: www.patreon.com/engineeringexplained

[@BenJuan26]

"VTEC ̶k̶i̶c̶k̶s̶ ̶i̶n̶ ̶y̶o̶ changes it to a different cam profile"

[@solngv8]

"You rev it and rev it and rev it until the valves come out and dance on top of the bonnet, and then you change gear." - James May talking about a very small Fiat engine

[@tpz7618]

man... you go through such a great deal of mathematics to explain your videos in the greatest detail which I appreciate!!! Sad to say all 583 folks who gave you a thumbs down just wanted you to say "shift from first to second at "x" rpm" etc...

[@BAC_Mono]

Brilliant explanation Jason. Its also why for race cars you need different gear sets for different tracks, you pick the longest gear so it just redlines on the longest straight and then space the others so each down shift puts you as high up the torque curve as possible while allowing 1st and second to be short enough for the start and not leave any gaps (obviously in practice lots a bit more complicated). F3 teams literally travel with cases of gear ratios which they swap around. I geared my BAC Mono in this way for Silverstone and it makes a big difference.

[@noahcisneros1787]

TLDW: shift at redline

[@wsade1]

LOL

[@gsteel98]

What does TLDW mean

[@xidaq4998]

@@gsteel98 too long didn't watch

[@865tanman]

Lol

[@asdf52708]

thanks

[@peace7646]

I did the math for a 2.0 tdi from Audi with 140kW, which has a big drop of torque after 3000rpm. As it turns out, the gears in the 6-speed manual are perfectly matched to the engine (what should be expected). When you shift from 3. to 4. at 4500 rpm (redline) the engine drops to 3300rpm but the wheeltourque stays the same. If you shift earlier, you get less torque that in the lower gear. Same for 4. to 5. So even with a diesel engine, that has peak torque form 2k to 3k rpm, you should rev it to redline.

[@ptviwatcher]

This is very important in Diesel cars: I have a 2.2HDi car (406 coupe), and despite the fact it redlines at 5000rpm, peak power and peak torque occur at much lower RPM. The torque drop betweeen 4000 and 5000rpm is huge, and after downloading my torque curve to a spreadsheet I was able to figure out it was only logic to push 1st gear to redline, because of the output ratio difference from 1st to 2nd. All other gears should be shifted well below redline. Very nice video!

[@RamjetX]

Wrong... if you want to go faster... shift down... then down again... and when you get to the lowest gear... shift down again. Fast and Furious has taught me all I need to know about racing.

[@generationrocknroll]

In this case you could've just explained this whole thing based on power. A transmission just transforms a set of torque and rpm into another set of torque and rpm - the product of both (power) stays the same going in and out of the transmission (losses aside). So for max acceleration you just want to shift in a way that gives you more engine power (equally more wheel power) after shifting, which means shifting at max or almost max rpm with most automobile engines. There's some layouts with massive power drops in the higher rpm range (like some older truck-/van- td's) - with these you might loose too much time staying in that drop-zone for too long, even if power after shifting might be higher than when shifting earlier. Anyway... just wanted to mention that simplified power-thing - would've fit in perfectly, given your juggling with torque, rpm and gear ratio figures; even if you essentially explained the same thing and came to the same conclusions. First time I thought "well maybe I would've explained it a little differently" in one of your videos though - and I watched them all (or maybe 92% or so). Killer s2k sketch. I recognized it immediately. Cheers from a german fan and engineering colleague.

[@sayingnigromakesyoutubecry2647]

I am a little slow right now, mentally speaking, but so far your comment makes sense. Power is torque x rpm. So you are keeping all that variables in mind. It makes sense that you want the most power at all times, so, you have to be in the peak of the power curve. Normally redline hits when power starts to drop. And also, power starts to drop many rpm after torque drops off. I guess car manufacturers always tune they cars so the redline is little after you should make the shift (like 200 rpm or so). Your goal is to maintain the engine in the happy zone.

[@joshuareyes7442]

You're an engineer and obviously a skilled artist... That's the best blue s2000 drawing ever! (I know you were kidding, I'm just being funny)

[@mibars]

No, it's absolutely wrong! Top always down! :)

[@ΑΡΗΣΚΟΡΝΑΡΑΚΗΣ]

the S2K has even a spoiler

[@frankth3frizz]

that proportional hood length.

[@jimmesc]

I thought it looked more like a 2005 than a 2002

[@yrsplaya]

To be fair though, that drawing would have been decent if he said it was a Honda S800

[@the-real-zpero]

hey can you do a video on the cooling system as it runs through the engine? it's pretty simple in theory, it's just a heat exchanger, but I've never seen an engine block in that detail so it would be cool to see how the water flows through the engine in order to cool it :P

[@PressinPickle]

noob

[@the-real-zpero]

Thanks for your informative comment.

[@sayingnigromakesyoutubecry2647]

It has holes and the cooling liquid goes there. It's not simple to design I guess

[@HiPerformancer]

Its fantastic how you make those complicated things clear for us, thanks and hello from Russia!

[@EngineeringExplained]

Happy to hear it, thanks!

[@rizkiyoist]

It's fantastic how he made the CONCLUSION clear for us. The complicated things stays complicated, at least for me. I just wait till the end until he said, 'So that means is, basically running out to red line and then shift gears. And that's gonna be the case for tons of other cars out there...' then I was like, oh so that's how I should change gears. And then move on.

[@spencerphilippinedream3706]

7:42 question: "so when would it not be ideal to shift at redline?" my answer: "when backing up?"

[@IvanRiveraStagea]

Great video, Jason. Most modern petrol cars do behave like this. Diesels often do not, and turbo petrol/diesel engines are just more difficult to compute for. Could you make a video about dyno performance of turbocharged motors in different gears? They dyno worse in lower gears as the engine revs quicker in those gears, making lag more evident. Sometimes it makes sense to shift sooner to be on the next gear (especially for engines with a low boost threshold) and stay on boost longer than to wind out the motor while experiencing turbo lag the entire time in first or second. This video would be relevant because of the popularity of turbocharging these days. Thank you very much!

[@melody3741]

Do they not have any form of boost/lag control?

[@QuincyStick]

@@melody3741 Factory cars don't however they do usually run recirc valves which should help largely elminate lag between shifts.

[@ImKittyCow]

THANK YOU FINALLY. Ive been trying to explain this to people for MONTHS and all i hear is "no you always wanna shift at your hp peak so power doesnt fall off"

[@EngineeringExplained]

Now you can slap them with knowledge! :)

[@themisdimitriadis]

But of course this is the case for this specific car. Maybe in another car the torque drops much more vertically. You still have to do the math for your vehicle (if you don't have an S2000) to convince them :P

[@derallli1]

Now this puzzled me a bit at first, since i remember that power was torque times RPM. However, it is torque and RPM at the wheels that we maximize here (and therefore the power we get on the street). The RPM in the graph is at the engine (before the gear box that drives the wheels).

[@clapanse]

You can do all of this with power, and it's quite a bit simpler though. You do want to shift so your power doesn't fall off, but what they're missing is that if you shift at the power peak, your power falls off because you're way below the power peak in the next gear. You want to shift at the correct point so you're making just as much power in the next gear as you are in the current gear, so you want to end up straddling peak power with your shifts.

[@fortressofsoliddudes4597]

I love how you use the words "of course" so frequently, as if I know this stuff. That's why I'm here!

[@franciscofuentes2891]

dude, if it wasn't for you I wouldnt have known what I want to major in!! because of you I now know what I want to do which is mechanical engineer too but more into Motorsports engineering, I thank you for that. Keep up the great work, we're almost at 1 million subscribers.

[@manojamrish]

Gg. How did it go and what are you upto now?

[@giorx5]

To sum it up, it all depends to grear ratios and torque delivery throughout the rpm range. Nice video.

[@jamesbutler606]

This would be more interesting for a small turbo car (1.6T~150-175bhp) and a diesel car (2.0T 140-170bhp) - the kind of cars most people drive across the pond.

[@jamesbutler606]

DuBstep115 so you want to Know for a useless vehicle Rather than have it for a vehicle You will actually drive?

[@bcubed72]

VTEC actually acts a lot like a turbo...sorta mild at low RPM, then a big kick in the butt when the turbo spools/VTEC kicks in. Your torque curve would be similar.

[@SBeckerDTD]

James Butler 5.7 useless? 😂

[@jamesbutler606]

SBeckerDTD yes, no one drives 5.7litre cars because it would cost £300 to fill the tank with dirty petrol. I, like about 58% of The population drive a diesel therefore it would be interesting to know. However I have done my own experiments and find that changing at 2000-2300 is optimal for low noise and smooth driving.

[@DannyJP29]

James Butler Weird. I don't know anyone who drives a diesel car.

[@TylertheGeek28]

I wanted to see a video of you actually shifting, the thumbnail brought me here lol

[@EngineeringExplained]

+TylertheGeek28 video coming soon of 9K in the S2000!

[@jrherita]

Can we get a version of the graph with the GT350 instead? :)

[@gabrielb.2886]

Simpler method : Max torque at the wheels is also Max power at the wheels. Assuming no losses, power at the wheels is power at the engine. Knowing the gear ratios, draw on the same graph for each gear power in function of the speed (same as power in function of rpm but scaling with the gear ratios). Always be on the curve at the top. Done

[@vizourcz8003]

Now I can smoke BMWs with my 1999 Škoda Fabia 1.4 MPI.

[@charliedee9276]

Thank you for the link to the book. I just received it and cannot put it down now. Currently working toward my BSME after a 25 year career as a chassis and suspension designer. Cut my teeth on the original Viper, not a bad way to start. I really enjoy every one of your video's, your lingo sounds as if your are a product test Engineer.

[@BigJnWorldWide]

Such a great video! My EMS allows me to set a shift light (CEL) for each individual gear. Even though I'll be autox'ing and won't leave second gear, it'll be nice to see my shift points and pay more attention to the course vs constantly eyeballing my rpms. Thanks so much!!!

[@xDRAN0x]

When? Paul Walker taught me to shift whenever I can.

[@FuchsiaShocked]

All the way into 9th gear.

[@pgluckydog]

A.K.A Ghost Rider...

[@davidfont2596]

Would you do another video on when to shift fears to get the maximum fuel efficiency?

[@b18crex]

Glad you got this answer, I don't think my s2000 saw anything but redline when I had it. Thanks for the confirmation I was doing the right thing.

[@clover7359]

Basically, power when you leave the gear equals power when you enter the next gear.

[@rizkiyoist]

Exactly Precisely

[@chrisarnold769]

So much simpler and exactly the same result. Me thinks that he doesn't understand power.

[@rcghalohell]

ExactlyPrecisely saved me 8 minutes and 39 seconds

[@SzaboStudio]

oh my God. *insert thank you gif*

[@Rajivc666]

Exactly. Usually he is good. But he should have researched this better. Heard youtube has changed payment policy. People have to make videos more often. It is making many desperate. Quality will go down.

[@chainsov]

Great video, another video would be awesome for everyday driving, 1. how to shift for for optimal fuel efficiency and another one called 2. how to shift to minimize wear on engine/turbo/particle filter/other parts split by cold engine/warm engine phases

[@TimpBizkit]

It would usually be the case that you'd shift at redline or just before the limiter in the vast majority of cars, unless you have very closely spaced gears and restrictive top end. For example my Peugeot 206 HDi seems a bit limited when you go in the 4000-5000 range, (possibly due to the computer limiting the fuel though). I used to think in terms of where the average power within the range you use the gear is greatest but it is probably simpler to think in terms of torque. Obviously if you have a CVT you'd just keep it at the power peak.

[@rjsbass]

One of the best educational YT videos out there. Good stuff.

[@0RespectMyAuthority0]

"When is shift ideal not at red line" You learn me good!

[@EngineeringExplained]

7:43 "So when would it not be ideal to shift at redline?" Seems like a normal sentence to me...

[@0RespectMyAuthority0]

I was poking fun at what you wrote on the whiteboard :D Great vid btw!

[@Nekro9000]

you misquoted the whiteboard

[@brianfox340]

I like most of your videos, but this one is saved to watch again later and do the math for my car. Love this one

[@andy42x]

This dude always impresses me.

[@MuscleCarLover]

I feel as if this video was made for me as I've always asked whether going to redline was always the quickest way and now I know that most of the time it is. Thank you

[@blakes2k]

I usually just shift my S2000 when it starts bumping at the top and wont let me go fast no more

[@RzVids]

Blake Calabrese you're wearing out the clutch faster.

[@IIGrayfoxII]

How? Engine limiter controls fuel injection.

[@brkbtjunkie]

RzVids how's that?

[@brkbtjunkie]

RzVids how's that?

[@adolfshitler8341]

I don't even have a tachometer so I only upshift when I feel the car isn't accelerating as quickly as it could if I'm entering a highway on leaving traffic lights and stop signs. On quiet streets though I upshift by sound, to save fuel I upshift as early as possible without stalling, quiet sound = saving fuel

[@Dangnilo]

Thank you for drawing specifically my car, I feel special! Great vids btw.

[@lemonpaper]

You could simplify this by just saying "shift when horsepower in the gear you're in drops below horsepower in the next gear." Power adjusts force/torque for speed.

[@jmsterdam]

Daniel Oliver yep, my thought exactly. He should do a video for a fast diesel and determine when to shift for max acceleration...

[@Pwasercan]

I can't express how good this video-explanation is. Every new driver in the world should watch this masterclass

[@akiskev]

A more "geometric" approach would be to take dyno graphs for each gear (speed-hp plot) and see at what speed the lines cross. That's the optimal speed to change gear. IMG: s260.photobucket.com/user/cdcracing/media/ingearpower.png.html

[@karlmalone11]

akiskev yeah that graph makes it easy to understand. A lot of people think they should shift at peak horsepower because it drops after that, but they don't know shifting to the next gear results in more horsepower drop that revving it to redline

[@wobblysauce]

That is it.

[@barefeats]

akiskev An old issue of Hot Rod Magazine explained the intersecting power curve in each gear as optimal shift point. It added that, because of slight deceleration during a manual shift, you should rev slightly beyond the intersection point before shifting.

[@doc7000]

You change gears based on rpm and not based on speed....... it is so much more simple to do it this way then to try and match your shifts based on your speed.

[@bcubed72]

*"An old issue of Hot Rod Magazine explained the intersecting power curve in each gear as optimal shift point."* No, because those lines ALWAYS cross at 5252 RPM. In a truck diesel, you'd trash the engine before you got there...in a Wankel rotary, you wouldn't even be in the powerband yet! (It's probably a good estimate for a large, pushrod V8, though.)

[@grayhusky3154]

This guy does so much for the car community and saves people so much money teaching how to safely modify your car

[@0hn0haha]

#notifsquad!!!! I, like Dulcich from Engine Masters, always shift at redline.

[@EngineeringExplained]

If nothing else, do it for the sound!

[@GeorgeAllensenoV_Linx]

I have little to no car experience, and am very bad at math. But you made this veru enjoyable and even I understood the concepts. Thank you so much for a great video.

[@zodiac909]

"All we know is....HE'S NOT James May, He's James May's American Cousin!"

[@qman61698]

Thanks for this. My truck has a 5 speed featuring a very close 1-2 shift and after mathing it out, i have learned that first gear i should shift 500 rpm early and then redline every other gear

[@Trumppower]

how do i shift in automatic..? or did my auto shift ?

[@SavageSalad69]

I can make my auto upshift if i let off the gas a little bit

[@rizkiyoist]

Yours must be a fake automatic. Real automatic shifts, automatically.

[@patw52pb1]

More misconceptions and misinformation. Most automatic transmissions do shift automatically, can be manually shifted and can be tricked to shift in auto mode by manipulating the throttle. Most automatic transmissions sense the load, either by a mechanical governor or through electronic sensors controlling the shifts to maintain a compromise of performance at less than 75% full throttle or compromise fuel economy at more than 75% full throttle.

[@Trumppower]

did i won the election ? vote Trump and shift up.. lol

[@vinsonli9548]

TrumpCorp. I can't vote Trump, I live in Canada.

[@Smilie6669]

Lol. I'm glad I'm not the only one that looks at factory power curves in this way. This is why I'm subscribed to your channel; I can relate.

[@luisthebubble2478]

Can you Make a video showing relation between weight and horsepower. For example a race with something that weighs 200lbs with 200hp. Vs. 2000lbs with 600hp

[@maximelaplante735]

Great video. This is probably not a very useful exercise for stock cars, but definitely for anyone with major modifications.

[@627horsepowers]

math and science for (shifting, throttle input, ignition timing, manifold pressure) for best fuel economy while accelerating, cruising, and decelerating...please.

[@Bigheader]

Thanks for all your great, knowledgeable videos. I love how it's all fact/science based, gives me a ton of confidence in my SI!

[@Dnshev]

Hello, there is a mistake in calculation: when you upshift from 1st to 2nd the gear ratio drops by 34.727%, it will increase by 53.2% in case of downshifting from 2nd to 1st. Correct gear disadvantages here: 34.727% 27.58% 21.6% 16.36% 16.48% Your number are for upshifts. Your videos are super interesting for watching. Thank you.

[@tiuk23]

That really makes me want to dyno my car and apply this. Not because of the speed, but because of economy. I want to combust my fuel as efficiently as posssible, so I will probably so some research on this topic. Nice video and explanation.

[@Guranga93]

For best acceleration you always want to shift at the redline, and when your close to topspeed, kick in the *racegear* (that's the one with a R)

[@kcwalkman]

Jason, thank you for such incredible content on your channel. Always a pleasure to watch any of your content.

[@hwwhwh]

When To Shift Gears For The Fastest Acceleration : When the G29 shifting lights start blinking.

[@Rancho.Jimenez]

I really wanted to see your cluster in action. S2000 is probably one of the best looking clusters out there imo.

[@andymanic1]

'Beautiful blue Honda S2000' - Ha.

[@EngineeringExplained]

Spent weeks on that sketch. Minutes on the explanation.

[@mortadachevy6031]

im dying😂😂😂 @engineeringexplained

[@fathermush7404]

Always love this guys videos, I watch them even if I dont necessarily care about whats going on. Theyre just super well made and organized videos. No redundancy with an intro, no wasted time, and he uses math to visualize what hes talking about for morons like me who are bad at english

[@heynando]

this imperial system really fucks it up for me..

[@jimmywannstrom5151]

Very useful! Ive always just looked at the dyno curve. And shifting gears right before it starts to drop off, and lands in the beginning of the peak torque. Now I can rev my CTR to the redline again! :P

[@upthechoppa3693]

This man turned shifting in to my math teacher🤯

[@andthecowsaysmoo4]

Seriously one of the best youtubers ever. Well done!

[@norwegiantechnolover]

Off topic: I have such a hard time trying to figure out whether this guy's in his 20's or 40's. Looks like he is in his 20's however he has a bit of gray hairs going.

[@insanedeception7600]

so somewhere in his 30's?

[@NoshNosher]

i got a bunch of grey hairs and im 24, lmao.

[@kevinnorris6558]

I’m 19 and my hairline has already receded around the corners.

[@voltaoltav4686]

@@kevinnorris6558 Waay ahead of you and i am 9 years younger😂

[@kevinnorris6558]

Volta Oltav As an update, I’m almost 21 and look at least 10 years above my age.

[@jeffbeasley8235]

Should have mentioned that at a given speed, maximizing horsepower will also maximize wheel torque. Lots of people get confused about power vs torque and that statement cleanly relates them. Thanks for the video!

[@athonreas]

I'm a bit confused here. I always thought that max HP provide the actual max acceleration, whereas an increase in torque will only increase the weight that the engine can move. Power measures how fast you put torque down and if 100 lb are enough to get you moving at all, more wheel HP translate to faster acceleration, not higher torque. So with this logic, having a higher power output of the engine (which increases until 8800 in the S2000 example) matters more than the torque that falls after 7850 RPM. Am I right, or wrong?

[@sayingnigromakesyoutubecry2647]

That's right. Power / hp is the important. He considers torque and rpm so he is considering power. Remember that torque x rpm = power. It's sorta the same thing. I think that it's easier if you put everything in terms of power. And also, rpm in the wheels itself it's what it gives you the speed you are getting. Power makes the calculations easier since power should be equal in any stage of the transmission, having losses aside.

[@nojobnogirl]

I knew it was an s2000 from the start. Good drawing, good info, good video. Thanks!

[@jeremyj.5687]

I think revving it to the redline will be the best options for nearly every single gasoline engine / transmission combo out there. But Diesel engines might be a lot different. When you e.g. look at the more modern Audi Diesels, they have a very early peak torque (or plateau torque, to be exact). Combined with Audi's usually relatively long final gear, you´d lose heaps of wheel torque if you revved the tits off that kind of car.

[@bschaible43]

Such a good teacher you make it simple enough for everyone to understand! Can you make a video on how to figure out brake horsepower a vehicle displays and maybe compare it to track cars numbers.

[@ThisIndio]

Wish he would say "when vtec kicks in yo"

[@adamhelmers3185]

This video alone has allowed me to go against what all the drag racers have told me to do in my 1998 mustang gt. They all say i need to shift at or just after peak horse power to get the best ET at the drag strip. Well after doing the math myself armed with my own dyno graph (280hp 330trq) ive been able to get a 12.9 second pass at 104.5mph in a very slightly modified 1998 mustang gt.

[@mociczyczki]

Well they was partly correct , all depend how powergraph egzacly look like 🤷🏻‍♂️ and how big are diffrenc in gear lenght 👌🏻 if gearing allow engine to stay at constant flat peak power than you dont need to spin more rpm than rpm where peak power ending in fact you cant unless you want accelerate slower 🤷🏻‍♂️

[@adamhelmers3185]

@@mociczyczki well if you noticed, I said I did the math myself meaning using the dyno graph I have from getting dyno tuned I was able to prove what the majority of people say wrong when it comes to shifting points for my platform

[@mociczyczki]

@@adamhelmers3185 ok 👌🏻

[@LawrenceTimme]

You shift gears when you want to overtake someone in a 5 min drag race

[@amainobi]

In my experience with driving an S2000, you end up in a lot of inadvertent drag races just building torque when taking off in 1st. Especially against pickup trucks, for some reason...

[@Pigeonbutter8790]

+DuBstep115 I saw a nice yellow S2k today while in an old 4Runner and I said "hey man, want to race?" And he looked at me and sped away

[@AR-rk9nn]

DuBstep115 240hp is not underpowered, short gearing and a high peak power is why fast hondas don't work well on highways

[@bcubed72]

What sort of feckin' drag race lasts 5 minutes?!? Heck, a top-speed Bonneville run probably doesn't take that long!

[@NikkyElso]

bcubed72 come on bruh haven't you seen the real street racing documentary series from 2001 called Fast amd Furious

[@mituc]

For pretty much any NA car you'll have to shift at redline or almost rev limit. For turbo cars the situation change especially because these days even if the cars have relatively high rev limits (6500-7000rpm) the turbos are sized for better response in the most common situations (so 1500-4000rpm) which means that once you to past a certain RPM point it's either the ECU tune or the physical capabilities of the turbo that limit the output. So in petrol turbo cars, or most of them, you'd rather want to shift before 6000-maybe-6200rpm even if the rev limit is 500-1000rpms later.

[@SomeOtherGryph]

I would think you would want to shift from 3rd to 4th at about 8150 since your torque curve is dropping from 7850 on. If 8800 in 3rd = 6900 in 4th, and there's no difference between Wt@6900 and Wt@6250, that's 650 revs, so on 3rd you should shift at 8150, so you don't have as much drop, resulting in more overall power applied.

[@xXUnoriginalNameXx33Meygaera]

"there's no difference between Wt@6900 and Wt@6250" You are not taking into account the gear ratio difference between 3rd and 4th gear as he explains in the video. At 6900 rpm and 6250 rpm the "ENGINE" puts out about the same torque, but torque that is applied to the wheels is less in a higher gear.

[@javedfazil6686]

great explanation by the way. I have been watching your videos for a very long period of time. keep it up

[@anmoldroid]

what about diesel engines? 2.0 tdi for example

[@MurmurMurmur-pd1ww]

I think it's actually simpler than that (although the end result is the same): for max acceleration, you should shift when the rising engine _power_ produced at the higher gear (i.e. after the RPM drop), is equal to the tapering engine _power_ produced at the lower gear. Or, if that is not possible (i.e. if even at redline, the engine power produced at the higher gear is lower), then shift at redline.

[@nikosliras8102]

engineering explained I want two stroke exhaust's. Are they not fascinating enough for a video??

[@ryanrohauer5940]

I started reading on them and their quite an engineering feat.

[@nikosliras8102]

it's like vtec for two stroke's and fully tunable!!

[@EngineeringExplained]

Watch towards the end! kzbin.info/www/bejne/sF6acp55aMybatk

[@djpee25]

Oh yeah!!! Now i'll be at work at 9:27 instead of 9:30 in the morning thanks to your video!!! ,)

[@paulsmyers203]

Yay blue S2000! ;) (2006 Laguna Blue Pearl)

[@RamjetX]

Monte Carlo Blue 2000 AP1 ;)

[@KodieCollingsGaming]

Great video. I love all the engineering explanations on your whiteboard although they can be a little confusing at times. Can you give in car examples next time?

[@flap2380]

lb.ft...aaaaargh 'Muricans and their weird systems! :P At least, when it comes to torque, use N.m as unity! Interesting explanation btw.

[@usonumabeach300]

This explains why I've read Buick 455 owners talking about shifting several hundred rpm before redline when drag racing, the Buick 455 makes peak torque very low compared to most motors

[@smanders-smanders]

Many turbocharged cars loose tons of boost at high RPMs and that torque curve dies off quickly. I would like to see a torque curve that does not justify shifting at redline.

[@bn880]

Turbo cars dont lose any boost at high RPM.

[@shadquirk607]

this was the most in depth, most complicated and most technical way of basically saying 'don't shift until redline' i've ever seen.

[@TheXtremesoundz]

When do I shift in my Turbo Diesel that has peak torque at 1900rpm which tails off very quickly?

[@alfonssiggler6652]

good question, would like to know that too :) ... what about diesel engines??^^

[@fernandofragoso4118]

You apply the same principle. You must go a bit after the peak HP because when you shift into the next gear the rev will go down and you need to be in a good point of your powerband, so is the min/max better average that you have to know. Its the same principle.

[@alfonssiggler6652]

ah thank you, nice :)

[@jjrestomods]

I also daily a turbo diesel, and this method helps: If when I upshift, I feel a loss in Torque, I should've shifted later If when I upshift, I feel an increase in Torque, I should've shifted earlier It's not very scientific, but it works! And after a couple of tries you start to shift in the exact moment

[@fernandofragoso4118]

Javier E Yep mate. Then its just a matter of checking the times.

[@markhall7173]

It would be good to see this for turbo cars where the peak torque is much lower, between 2000rpm and 4000rpm, especially for smaller turbo cars like the GTI, Focus ST etc.

[@TheTurpin1234]

Why do this without 1 flat acceleration run on the s2000? I really wanted to hear that VTECH yo,

[@elanjacobs1]

There's no 'H' in VTEC

[@TheTurpin1234]

No I meant VTECH, but there was none of that in this video either.

[@user-tl1qp9dq4e]

im going to use this to set up a shift light, thx so much. love the videos, very informative, and as always awesome white board demonstrations.

[@puffnpluky76]

From the thumbnail I thought we were finally gonna see him driving his S2000

[@EngineeringExplained]

October 16th, as of now! :)

[@puffnpluky76]

can't wait! you don't know how excited I was when I saw you bought my favourite car

[@Ninnlilium]

I love your videos and the juicy details. Good on you for the details. My favorite car channel of the year :3