What Is Two Step? Rev Limiters Explained

[@EngineeringExplained]

Something I obviously should have mentioned, but did not, is that with modern electronic throttle bodies, it's very easy control RPM (especially for the lower RPM rev-limit for launching) simply by limiting throttle, and then opening the throttle fully once the brake pedal is released or the clutch is engaged.

[@Chromov113]

Hey, maybe you make a video on electronic throttle bodies? How are they made, are there different types, and is there an issue that throttle valve moves slower than the driver engages the gas pedal.

[@ogdrifter9977]

Andrey Studentsov believe it or not, he kinda already has. Nissan VVEL video should show you the basics

[@jeffbeasley8235]

In a more generic sense, the ECU reduces the air charge entering the engine. Depending on the system, that can mean closing the throttle, reducing intake valve lift, reducing boost pressure, etc.This is by far the most common way that modern ECUs control engine overspeed. Additionally, leaning the mixture is not usually used to reduce torque, as very quickly you will reach a point where the mixture won't burn (lean misfire). That happens long before you are to the point of reducing net torque to 0 and is also very bad for emissions.

[@colinbarrineau3102]

Off topic but I have a question. What equation could I use to compare two veicles, and see which one would beat the other. For example a 350hp civic vs. a 440hp challenger

[@honeybadgerflys8162]

Can you do a vid on fuel like e85 and the pump gases.

[@tlick88]

do a video explaining why Mustang owners can't drive.

[@yeahnahyeah7872]

AsiaNYelloWNecK dude mustang owners CAN drive.... just ONLY in 1st gear, hit 2nd and they are up kerbs and into walls or oncoming traffic 🤙

[@joncross2369]

damn straight

[@r.o.4357]

They own mustangs the answer is in the car they purchased

[@superrad1659]

Live rear end.. there is tiny amount of side to side play from the axles to the diff. when some amateur smashes on their new GT, that tiny play actually amounts to a significant translation sometimes allowing the rear end to 'walk' or 'hop' side-side. which results in a crowd torpedo. lol There IS actually a reason for it lol.

[@zawarudo213]

See that is a question that not even science can explain.

[@rocknexus55]

me trying to play any sport: h e a v i l y r e t a r d e d t i m i n g

[@alexkersten1964]

I watched this while wearing my new EE T-shirt. It made me learn 50% more efficiently. 2-step is awesome. Anti-lag is awesomer. They are not the same. The end.

[@hawkeyestiguy]

I'm wearing mine as well. Haha. I should have bought 1 for every day of the week.

[@EngineeringExplained]

Wish my explanations could be that succinct! I am also wearing an EE shirt; it's mostly a vanity thing. Thanks y'all!

[@5555Latest]

Engineering Explained your video is all blacked out, can't view it

[@grettagrids]

but anti lag can harm the turbo or engine.

[@xxhaydenxxxxvansantxx9409]

I didn't know that

[@Kron_MM]

You look like the kind of man how can be 22 but also 45 yo

[@EngineeringExplained]

Wise for my years (that's what grey hair means, right?), young at heart.

[@killabyt3]

Engineering Explained​ Very true I got some gray hairs at 19

[@adityaputratama2]

How old is he actually?

[@Kron_MM]

no idea. somewhere between 22 and 45 is my guess XD

[@Nitrxgen]

One source dated June 2014 says he was 24... so by June this year, he'll be 27. Hard to judge in January because I can't find out the month he was born.

[@XBlockAcah]

*Honda Owners Dream explained...

[@Ms.Fowlbwahhh]

lol not a bad joke but you can add launch control with a tuning tool :)

[@DyingToLive12]

i resent that remark !

[@FreznoVX]

X Blocky mine came with 2-step stock, and with Hondata it was made more efficient lol.

[@DyingToLive12]

FreznoVX i was running AEM standalone ecu. it wasnan option but i never set it up, daily street use turbo si. no need really. i babied my car. launch control however would have been nice

[@warpath77]

Ahhh enter the generic inept "car enthusiast"

[@ItsNigisBae]

I’m so thankful for this channel. You explain all the stuff no one else cares enough to discuss.

[@BoziTatarevic1]

Very clear and concise explanation. Modern engine management makes 2-step much easier to implement and some aftermarket boxes now even have 3-step which is very useful for drag racers.

[@jameseastwood4984]

What's the extra step used for?

[@Mark3FocusRS]

You are awesome man! I've been watching you almost since you started and I have learned everything I know about cars from you. Thank you for all of your time and effort into your, easy to understand, videos! Sincerely, A true fan

[@jonsouth2592]

Great video man. Way to understand the "why and how" on things. Seriously, you are more of a car guy, in my opinion, than most of the "frat boy" racers that I know with with v8's.

[@renarudo1]

EE, I see what your doing. Trying to be the Mr Rogers/Bill Nye for car enthusiasts. Keep up the great work, sir.

[@aussiebloke609]

I'll go with "Bill Nye"...but he's not wearing a cardigan. :-D

[@metalshamrock55]

Really well explained. Thanks for the comparison to ALS and going through the differences.

[@twiggslax]

Had this question today, knew if I put it in KZbin, this channel would show up. Grateful for your content! Keep doing what you do!

[@prayerpowersr854]

"can i have those launch codes"

[@patw52pb1]

Ask Putin...

[@prayerpowersr854]

Poo tin?

[@harsimranPB22]

John Kyon poutine eh?

[@thecommenter9726]

Puuden

[@carlosherrera8541]

Pudding

[@potjnkye86]

always learning new stuff about cars

[@nothing2see315]

Just tell the future to give me back my handbrake

[@drink_kompot3656]

Hello this the future, unfortunately I can't deliver your handbrake.

[@jtd3d351]

🤣🤣🤣 I agree. Thankfully I have a manual transmission car that still has a handbrake. Subaru WRX 🙏🏿 can’t go wrong.

[@XFader505]

What car do you have that doesn't have a hand brake?? Lol

[@NiquidFox]

@@XFader505 new type R’s or any civics don’t have a standard handbrake; it’s an electronic one

[@manguny92]

You the man Always dropping knowledge 🙌

[@manolisarchagelakis5448]

As an automotive engineer, I find all of your videos really intresting and helpfull , keep up the good work.

[@music-maker2505]

Just came across your channel from a Google search about 2 step.. Fantastic explanation.. Definitely another well deserved subscriber here (Respect from Ireland 🇮🇪)

[@neighborsjordan95]

I'd be interested in seeing another video about 2-Step vs Anti-Lag and the ignition and fuel based cut-offs but also including short clips of how each one sounds and how each might affect the engine internals in the long haul. I understand the clips will involve a fair amount of editing so I understand otherwise

[@IntricateJake]

Find one?

[@tarantulamadness6191]

I drive a mustang and I can go in a straight line, seems like that's pretty hard for some other people according to these comments.

[@SvtCobraKid1]

Its not the car its the driver. Thats like saying guns kill people, its the person not the gun. 12 year old keyboard warriors just tryina get a reaction 😂

[@placesunseen7007]

Stang gang

[@beanapprentice1687]

Can you turn though?

[@davidsferrazzo]

I am so happy rn, I just saw a vid of a mustang with 2 step and I wasn’t sure what it was and I was just about to see if this channel had a video to explain it thanks so much!

[@DzastinasLTL]

I thought EE went full swag with that AF bois!

[@wills.5762]

Me too

[@johnnyfedpost1776]

me: "I got fired today" friend: "why?" me: "I was late...my timing was retarded..."

[@connormo95]

I love how much I learn every time I watch one of your videos

[@isaacstrand9900]

Thank you very much for explaining this so well and with visuals. I'm trying to learn more about cars and this helps a ton.

[@MansSuperPower]

🤣😂 I love watching this guy just because I enjoy hearing terms, language, and concepts that I cannot understand. I never have any clue what he’s actually talking about. But my eyes are glued to my phone’s screen like I’m getting it. But nah, I have no idea. But here I am about to click on another video of his. 🤣😂🤣😂

[@CedricBoisvert]

this guy told us it all clear and simple, really clear and simple, and you say that hahahahha

[@BlagovestZlatev]

Jason handling that Mustang and not crashing or killing anyone? I'm impressed!

[@EngineeringExplained]

It did get a little squirrelly though!

[@Nizacx]

can you do a video explaining suspension setups, i.e, supercars suspension is at an angle, whereas normal cars the suspension goes vertical to the strut. would be fascinating to see the math behind it all.

[@jordyvanderStraten]

Nick Nack you mean chamber right?

[@Nizacx]

no. i mean the positioning of the suspension itself.

[@lookbehindyousuka]

Nick Nack you mean like double wishbone vs leaf springs..?

[@Nizacx]

sure, and all the other stuff listed above :)

[@jabadahut50]

MusicalNinja77 i think hes talking about the difference in castor and the reason for the difference in castor is it allows more grip without negative camber as well as yo keep the car lower but still have similar spring rates ((i think on that last part. ee may have a better explination))

[@n7565j]

Mr Engineering, Have you seen the clear headed Briggs & Stratton engine? It's fascinating watching the fuel air mixture enter the chamber, burn, and then exit the chamber!!! I realize it's a very basic engine, but it's still an amazing thing to watch ;-)

[@0riginalxx0utlaw]

Ok so if I’m gettin this right 2 step isn’t about keepin the turbo spooled necessarily (like anti lag) it’s bout stayin in the desired RPM to have the best launch.

[@Andrew-my1cp]

Yup. That's exactly what it is.

[@lanceuppercut6168]

Makes sense to me now. Guy I know runs 2 step on an NA truck and I was confused because I thought why he needs it if he has no turbo to spool.

[@dknollRX7]

You should also mention that a rev limiter only works when you're accelerating and the reva are increasing. The revs will climb to the point of that limiter rev range and then the limiter kicks in to prevent any damage. If you're driving a manual and mis-shift, let's say you wanted 4th but hit 2nd, the rev limiter will not prevent engine damage due to the mechanical force and gearing up to the engine, which will mechanically cause the engine to rev higher than the set limiter value.

[@derfernerf]

Another great video. No shame in saying I actually learned something here! Keep up the good work Jason!

[@stellabckw2033]

finally a good explaination. thank you!

[@r33wz]

The moment I saw "Run lean A/F" I read it wrong in my mind. Took me couple seconds to realize that A/F stands for Air/Fuel.

[@Fosten12]

"some fuel goes out exhaust" translated: SH00TING FLAMES

[@chiefzaydoe1466]

Seven of Nine 🤣🤣💯💯

[@HomeAmongTheWise]

My dad dad would say: wasting gas lol

[@adamsteele6683]

Love the videos, but you gotta get KZbin to stop cancelling subscriptions.... This is the 3rd time, I've had to subscribe to this channel. Anyways, what's the possibility of you doing a video on anti-lag specifically? I would love to see the more in-depth dive into what it is and how it works. Thanks, keep up the good work!

[@EngineeringExplained]

I have two videos on anti-lag! :) Have a quick search on my channel. Thanks!

[@sunshine049414]

Thank you for your videos they are so insightful and awesome to watch.

[@tanguythienpondt5461]

+1 for the effort you put in the videos!!

[@brandons7272]

Well then awesome video!! You made it very clear and understandable thanks very much keep up the good work

[@danieletripodi8906]

Was just about to add a comment about the throttle to control RPM but you caught it before me. Actually what is used to control RPM depends on the time frame it needs to happen. Cutting fuel is the sledge hammer approach, very aggressive and very fast. Retarding spark is also fast (can apply at next firing) and smooth but has limited range of authority before miss fire and emissions issues. Throttle is slower and smooth without any emissions / miss fire issues. However, as you pointed out the downside of using the throttle is reduced gases to spool up the turbo. A combination of all three is good.

[@Tanner-bg2qn]

All it boils down to is set the perfect rpm for launch so you leave making the most power possible without breaking traction. it's all about having the right tune up for whatever track/highway your on.

[@johnreese3762]

Great Vid! My life is now complete!!

[@arman5180]

Very good explained👍

[@KrustyKlown]

Great Channel - truly unique and educational !

[@everyidistaken]

again, really nice video and easy to understand for everyone, thank you :)

[@crasychat]

you are awsome , greetings from algeria

[@stevenfarrington2361]

84YM JDM Civic Si had 2-stage rev limiter preventing the engine revving over 4000 rpm when cold. Mazda Familia GTX (JDM version) enforced the Japanese 180 km/h speed limit with a fuel cut-out. Not good when the wastegate has a T-piece tube to produce overboost and you hit the speed limiter while boosting hard in 4th... pieces of piston ring everywhere... :-(

[@Calel_S]

Clear, cut explanation. Great job.

[@RickJames-qz8vt]

you stopped showing up on my youtube feed. I have missed you

[@samiral-said1653]

can you do a video on engines with modified forged internals? do they increase your hp or allow you to achieve greater performance numbers? do they last longer than regular engines? is it wise to buy for ex: sti with built forged internals? Great videos buddy, keep it up and thanks in advance

[@valgateverga9800]

Good info thanks. It all makes better sense now. I'm slowly getting to where I'm looking to be.

[@nox_chan]

thank you very much for making these videos

[@estheresbin1083]

Tomas Valdez good

[@marnixheijerman1911]

Your videos are so useful! thanks :)

[@Delzra]

nobody told me this beforehand, but when i hit redline/rev-limit the first time unintentionally my car shook like a bucking horse. i was quite shocked since i didn't expect this. '98 civic 1.4 s

[@Delzra]

in gear, of course.

[@mihatochilov7221]

Great video, as usual. Thank You for your work! 😊

[@simonlberzouk]

Good work ! It's appreciated in Belgium !

[@capugarb]

Thanks for making this great content :) Love your videos

[@heliezerhernandez8987]

Really good explained thanks

[@367scotty]

Great explanation

[@thebuffalodude]

Wow! Well done! Love it!

[@ErikvsLenny]

Thank u very much sir , ur helping me in my mechanics exam.. :)

[@robbyking8756]

For drag racing you wanna be at redline when you launch, but you run studder box and trans brake to do this a studder box makes the car miss every other cylinder so you can floor it till you go on whichever yellow light you leave on or count if your running on a pro tree and leave with max power so you shoot off like a rocket, there's no such thing as a no lag turbo I don't care what anyone says NHRA did a study on turbos and found it takes 2-3 seconds to actually make boost, and I've always got more power from advancing my timing not retarding it

[@jesupercars9096]

Thank you this video was very helpful. Also you have the same voice as Ross from friends

[@need4speedboss]

Jason, you should do a video on Mazda's homogeneous charge compression ignition!

[@mujjuman]

he did but he didnt do a video for something else tht i requested

[@kevinchapman9285]

My 2000 mustang (manual) had a 2 step rev limiter. One at redline and the other around 3500 if the speedo didn't get a signal. Although the first wasn't really apparent unless you tried driving without the speed sensor hooked up.

[@pezni3481]

Man you helped me so much

[@jacobspeeds]

LEAN AF!!

[@JoeIsCrazyWillman]

There, do a video next about transbrakes and line-locks.

[@DirtyGloveCJay]

can you do one on tire contact patch, the advantages and disadvantages? what's the ideal size and width?

[@michaelpersons1077]

On his board it said "Run lean A/F" Thought is meant run lean as fu** 😂😂😂

[@tuner_fan4490]

Do one of two step vs als covering price, complexity, prerequisites, etc.

[@Sharrendan]

Thank you, great explanation.

[@DustyDiesel]

I can only imagine how tough it is to simply the explanation, but you did well haha! - coming from an engineer

[@joonyaboy]

I liked the zoom in on the whiteboard

[@BrotherKellerman]

I left this video more confused than when I started

[@cali562ify]

2 step is just a rev limiter and he’s explaining the different methods used to achieve desired rpm

[@hondahater5]

Great lesson. Is there any chance of you explaining how an ITB setup can be beneficial to your S2000 or any other vehicle. Keep up the great work.

[@tarantulamadness6191]

Thanks, I'm glad I found this, I could't figure out why my car would sometimes only go to 2000 rpm when I would floor it. Now I know.

[@alejandrozuniga4426]

This guy is awesome

[@NBSV1]

Most of the newer cars with drive by wire throttles just back off the throttle for you to limit rpm. It doesn't sound as cool but is a little easier on the engine because you don't get what is basically a controlled missfire.

[@EngineeringExplained]

+NBSV1 yes, actually the easiest method with electronic throttles, and something I should have mentioned!

[@nikashoshitashvili9938]

I think it will be great idea to make a video about how speedometer's working

[@martinspeedy5018]

Thx for the vid, helped alot.

[@sk8terscrew4life]

Very useful, thank you

[@Mitutumuch]

ooooh ok. step 1. step 2. got it.I need this

[@ramizsadek9689]

you're awesome man.

[@ryanp1467]

This is great but how can you tell you have a 2 step rev limiter? Is there something you need to activate before you launch? Is it always active so if you rev without moving it’ll cutoff always?

[@ThunderHead289]

how is leaning an engine down at high rpm and high load safe. thats a bomb. period ad period. id have to see an afr gauge to believe that. lean mix burns way hotter, detonates much easier - there must be some ignition cutoff or that just would not work. its safest to cut ignition.

[@LessTalkMoreDelicious]

Brrraaaap bap braap bap!!! 🚗💥💥 💥 💥 💥 :D

[@insertnamehere4959]

I have a question: if on the later case, you open your exhaust valve while combustion is still happening, you'll obviously have flames coming out of the exhaust. But won't that damage the exhaust system components?

[@todddembsky8321]

Launch control has been around for decades. My 68 Chrysler had launch control. We called it stall speed, when you engine cannot produce anymore power to spin the torque converted faster -- normally these were around 2200 to 2600 rpm. Nothing beat left foot braking your dad's car on main street, stomp on the gas, and spin those 120/70 R15's all the way across the intersection.

[@patw52pb1]

Totally different reasons, strategies and results.

[@todddembsky8321]

patw52pb1 A little sarcasm never hurts. But I agree with you

[@sermichael2231]

Please make a review of your crosstrek :) how are you liking it? Good and bad side of owning one.

[@ozzypresident]

1:34 that Mustang just wont stay tamed or is it just bad driver

[@jameskimmel8695]

Interesting, so to keep the RPMs lower, you can actually Kid Rock the timing. Good to know!

[@daveyboii6682]

"Makes a little bang" *laughs in Honda ak47*

[@abc8531350]

I've read an article about the rev limiter, and it claimed that cutting fuel could increase the temperature of the engine, because the fuel takes out some heat out of the engine. And the engine could overheat. If so why modern cars use this method to limit rpm? Anyone knows?

[@allaidlaw4810]

Thank you well done 👍

[@smokeybear390]

Hey, I was watching your anti-lag video, and was thinking that the anti lag was similar to a diverter valve on some turbocharged cars. How much better do you think an anti lag system would work than a diverter valve at keeping a turbo spooled? also you should think about doing a video on diverter valves, great video, alway look forward to watching

[@Andyandrwew144]

can you please explain the performance aspects of a hydrogen fuel cell installations people have been doing?? pleaseee?? oh && great video. I watch ALL your stuff

[@Saad_and_Bubbly]

Yeah I watch all your videos I would like to know how introducing hydrogen gas to your air fuel mixture would effect the stoichiometric ratio and combustion temperature

[@JoeIsCrazyWillman]

Aren't these typically used in conjunction with transbrake, or are transbrakes used separately and the driver just controls the amount of rev themselves instead via throttle control rather than the 2-step system?

[@yungblade7]

So basically your car winds all the way to whatever you set it then shifts and eind to redline?