Things You Shouldn't Do With A New Differential

[@DENicholsAutoBravado]

I like how your sponsored content is still good content. :)

[@EngineeringExplained]

Thank you!

[@jgreen8339]

While you obviously had to display their products you didn't say specifically that we have to buy them which I thought was nice. You deserve to get some revenue from sponsorships for all your hard work.

[@JehuMcSpooran]

Yes. perfect balance of sponsorship plugging and normal content. This should be the benchmark for how to plug a brand properly

[@ec6933]

Man what are the odds, this is like the 3rd video in a row that's addressed exactly what I'm working on!?!?

[@EngineeringExplained]

Awesome! What's your current project?

[@beezap8892]

Engineering Explained earth is not a globe

[@Road2RacingPA]

Its a cube

[@AaronSwitchgear]

Engineering Explained he’s probably putting in a new ring and pinion

[@bumtracksNew]

Try not to beat on a wrench with a mallet & grasp the torque wrench properly so its more likely accurate.

[@rcse46]

Does this apply if you put it in a purple car ?

[@HK-cw1kz]

SquaresAreCube no sorry only in yellow cars....

[@EngineeringExplained]

Purple cars are magical and don't require any maintenance. The downside is purple cars tend to understeer.

[@ChrisKsan]

I've a '96 purple car, sport special 500 miles edition and the builder recommends doing 500 miles or so before doing 500 miles after which you can do 500 miles when you will have done those 500 miles you can do 500 more miles. And just to be on the safe side, do at least 500 miles. Remember, if you do 500 miles, you gotta do those 500 miles! ;)

[@Ueberdoziz]

aaaaaaaaaand i will drive 500 miles, and i will drive 500 more. just to be that purple car to drive 1000 miles to your door.

[@omarhasan2083]

yo, i love purple cars

[@jsr3793]

Last time i rebuild a diff I was helping my friend change the ring and pinion in his mustang. Filled the diff. Lowered the car. Pulled right in front of his house. Brought engine up to about 6000 RPM. Side stepped clutch. Incredible 50 yard long burnout. I haven't spoken to him in a few years. I really hope he doesn't watch KZbin

[@ForTehNguyen]

just a simple tip for changing anything with a fill and drain port. Always open the fill port first, because if for some reason you cant get the fill port open but you already opened the drain port, you are going to have one hell of a problem

[@EngineeringExplained]

Haha yep, fair point! Better to know that you can drive off and get an extra tool or part, than having an empty diff. Or you can just turn your car upside down, right? ;)

[@bunberrier]

Good point! Ill remember that.

[@That.Old.Toyota]

So, install LSD, and break in with launch control and clutch kicks? Got it.

[@Ueberdoziz]

but only the first 500 miles. afterwards you should only take on around 15-20 mile trips.

[@DickeyHepSleeve]

Hello everyone and welcome to my laboratory, where safety is number one priority.

[@EngineeringExplained]

Haha

[@jessstuart7495]

It would be interesting to see if the internal oil temperature of the differential is any hotter with the heavier gear oil. If the heavier oil runs hotter, you may not be getting as much benefit (higher film strength) as you expect. The difference might be insignificant too, with the heavier gear oil only running a few degrees warmer. Testing this might make for an interesting video.

[@LAustinSauce]

I swapped the differential in my 91' Ram last year and I put in a stock diff from a 76 Ram so i needed the axles from my 91' and make them fit into the 76' diff. I probably didn't do it 'by the book' but hell I got it to work and videos like this are the only reason i made it happen. Just a backyard mechanic here lol

[@nickolastiguan]

next video - hello, and welcome to my supercharged S2000

[@vulekv93]

Things you shouldn't do with new turbo/supercharger.

[@WarriorOfEden3033]

Are some noises normal during break in. Had a shop install mine but I have a few noises only drove 6 miles, only 2k rpm & went 45-50 mph

[@fernandoanatomia]

Where did you get that cool pump that fits in the bottle of oil and you can pump the oil up to the dif?

[@EngineeringExplained]

Bought it on Amazon, it's wonderful! amzn.to/2E95iGr

[@andrewpena100]

They’re also sold at Autozone next to the gear oil

[@spankeyfish]

That looks a lot like the pump from a soap bottle with a hose jammed onto the nozzle.

[@123456bmx]

spankeyfish basically yeah haha

[@Thommybee-85]

You can reuse the big soap pump bottles for this purpose if you have one laying about.

[@peterbruschi8690]

Step 1: Weld it! 😂 JK! Pro tip though, if you're changing your diff fluid, always make sure you can take out the fill plug before you drain all of the fluid out. Sometimes things get a little stuck down there and you don't want to let all your fluid out if you can't fill 'er back up!

[@BrianNC81]

Peter Bruschi If you have drain plug. My car only has the one plug so have to vacuum it out to swap fluid.

[@peterbruschi8690]

BrianNC81 what a PITA! I had a similar issue on a lady friend's Bonneville, had to flush the supercharger with a syringe.

[@BrianNC81]

It was pretty easy with a inexpensive hand pump from harbor freight. The differential fluid was dark after 90k miles.

[@peterbruschi8690]

BrianNC81 Interesting. When I changed the diff fluid on our '66 Bronco it was as gold and smelly as the new stuff that I was putting back in. Truck's been in the family since new and my old man said it had never been done. The diff fluid also looked fine on my Subaru at 60,000 miles, but it's cheap enough and I suppose it could be different on a molecular level.

[@behelpful1435]

@@BrianNC81 if you feel like spending for the extra fluid, you can just 'flood' the diff with new fluid, until the oil fluid goes out, and just the new fluid drips clear.

[@thomasmowinman]

This is so convenient because I'm rebuilding my differential right now

[@lukemoeller8946]

Maybe you shouldn't have destroyed it

[@thomasmowinman]

I didn't break it

[@lukemoeller8946]

"I think I broke a u-joint" murders diff

[@lukemoeller8946]

Thomas Fetters do you a magnet drain plug fir the ram?

[@lukemoeller8946]

True Blake broke it

[@fredEVOIX]

another great video :) you can apply that reasoning to a new car too, I always do a 300ish miles break-in but not specifically for the engine, for every other moving parts really (last 3 cars were awd so we have our lot of diffs and clutches)

[@n8bolton]

Almost by coincidence, the rear end in my Chevelle has started to howl and squeak within the last few days. I'm almost obligated to yank the entire thing out and throw in the big ol' posi 12-bolt that I've always wanted. Good info, as always.

[@chincemagnet]

Are there are situations where a heavier oil can be detrimental? I'm running double the factory power level in my Evo X, but have been hesitant to change up from the recommended fluids.

[@EngineeringExplained]

Well it's hard to know if the flow characteristics of the new oil will be worse for the differential. In this case, I leaned on the expertise of the builder of this differential (PuddyMod) who guarantees his work and his built hundreds of these. His experience in testing out various oils led him to the recommendation based on the wear of the differentials he sees. It's a good question to ask the company you buy a diff from, as to what oil they'd recommend for higher power levels.

[@Flyanb]

When it’s -20 they don’t want to loosen up for a LONG time

[@GarageSupra]

there is a excellent video from the Drive network on youtube where they interview a dude from Redline oil called "Dispelling Myths About Oil -- /ENGINEERED"

[@edb8257]

David bearings dont get lubed as quickly when first starting out with thicker oil

[@ChrisEckeard]

Yes there are situations were a heavier oil can be detrimental. Heavier oil in smaller motors will bog them down reducing power and creating more heat which causes wear and shortens component life. The bogging down will be most noticed in engines that operate a wet sump oiling system as the crank shaft spins through the oil sump, but would also show resistance in dry sump systems. A heavier oil actually boggs down all engine sizes as seen in reduced fuel economy, but other demands require the use of heavier oil such a mass, displacement, cooling, use, and power adders. That realty applies to your own vehicle. With double the power means ~double the heat and double the mechanical load. This requires a heavier oil to help protect the mechanical load while keeping the correct viscosity under heat. As shown in the videos diagram , heat changes viscosity and correct viscosity is needed to maintain enough flow and pressure. Do your engine a favor as well as your wallet. Go to a heavier oil, make sure it's synthetic, and change it often. Remember to check it often and regardless of brand, fresh oil is the best oil.

[@csechrist1]

As is obvious from the video it is a good idea to do an oil change on the diff. after the first couple hundred miles; what is the procedure after that, especially under high-load conditions such as track driving? Maybe a video soon on any special lubrication requirements inside a differential as opposed to the engine and why it doesn't need to be changed as often?

[@InvictvsNox]

I didn't even know you HAD to break in diffs... glad I clicked here. :)

[@ohyou_6599]

When I regeared my front dif, I just put in gears, thats it. Reused the bolts, seals, oil, bearings, all of it. Didnt even bother setting up the gears, just kept the OEM shims. I then proceeded to do multiple launches involving breaking loose all four 35in tires in low range. Dif works fine still, I don't see all the fuss in it.

[@DELTRANIO99]

Good vid I was wondering do new gears make noise at first before it breaks in ?

[@rebeccarichards4669]

I was wondering the same thing..I just had mine done but still feeling something in back end

[@ulyanof]

man you're doing my dream job. greetings from a fellow mechanical engineer. would love to hear your story about how you started all these.

[@nooranik21]

Dude, you put that diff in forever ago. It's taken you this long to do 500 miles?! I had a truck with no gas tank and I made it drink out of a red gas can in the bed, but I was so excited I drove it every day and put 500 miles on it in like a month. I did this despite the fact I had a fully functioning daily. Put some miles on that project man! It's a sweet car, beat on it. Drive, Fix, Repeat.

[@mitchnason]

torque wrench on a drain plug? definitely an engineer... i kidd, love the videos!

[@ChrisEckeard]

Resist choking up on your torque wrench when tighting anything including drain plugs. . That pressicion measuring device is designed to be pulled at the end of the handle to produce even and smooth torque to achieve accurate measurement.

[@EngineeringExplained]

Haha oh goodness... The diff bolt has a pretty low torque (aluminum housing), so I held it closer to ensure I wouldn’t accidentally over-tighten, which is quite easy to do with lots of leverage and low torque values.

[@ChrisEckeard]

Engineering Explained good reasoning. In the field we just tighten it until the "elbow of experience" clicks rather than reaching for the torque wrench for 46 Nm. In the classroom, we use the "correct" tool. Keep it up. ☺

[@NippyMoto]

Lol just installed my LSD today perfect video ! Although this is for a freshly rebuilt diff or brand new diff right ?

[@EngineeringExplained]

Awesome, enjoy it (but be patient initially haha)! Edit: To respond to your edit, new or rebuilt (both).

[@volvo09]

Differential pro tip: don't do massive peg leg burnouts with your open diff, you overheat the spider gears and kill it. They aren't designed for that type of extreme condition. Quick burnouts are ok, but if you are trying to pop a tire you will probably end up needing a diff fairly soon.

[@123456bmx]

Good stuff! Definitely makes me feel more comfortable once I drop 2g's for an lsd on my e82 BMW.

[@EngineeringExplained]

Good ones are certainly pricey, have fun with the new diff!

[@mpasistasyalanci]

In a smaller scale, in rc models the viscosity of the oil in the differential can change the character of it, more thick oil more limited slip alike, you can see massive difference from one choice to an other.

[@manfromnantucket9544]

I recently purchased a Quaife helical LSD for my FWD Eclipse GT. Does this apply to FWD vehicles as well?

[@Norg89]

Man from Nantucket yes make sure your rear diff is well maintained.

[@manfromnantucket9544]

R N lol, no rear diff, car is FWD

[@patw52pb1]

Yes.

[@adamchristiansen3548]

on the topic of setting up new things, could you please make a video on how to setup boost ratios between turbos. so for a compound turbo kit. there is a lot of information out there that contradicts itself and i think you would be the perfect person to lay it out straight.

[@lucascarillo614]

When are you supercharging the engine? Do you need to upgrade the transmission, suspension, breaks, or anything else before you supercharge it?

[@XiMiRz54]

Hay Jason, could you a series with your S2000, where you go on track modify your car for it ? You could explain how to improve stability, lap time, for a driver standpoint (When you get more experienced) and what to do for the car ..

[@_skidge_7447]

15-20 miles for the entire 500 miles. Just installed a new gear set and differential in my truck and new to move it from my parents to where I live 554 miles away.

[@SusanMiura-q1u]

I have a question my rear differential just got replaced at the dealership. They never talked about that. We should come back in 500 miles and change out oil now should I do that I have a Nissan Marano platinum can you help me out with this? Thank you.

[@aaronhowell2011]

Does this aftermarket diff weigh less than the stock unit? Would be a great added bonus for less mass/rotational mass.

[@derekrens3169]

Can you mix oil? My Honda is getting older. the oil cap says 5w30 is it OK to maybe mix a 10w30 in the change to help with where and heat . heat not so much this time of wear.

[@DontStopReeling]

What warranted buying a new diff over a gear swap , bearing install, and possibly even a clutch refresh?

[@GarageSupra]

He is supercharging the car, so preparing the rest of it for more power.

[@rowdyhick1525]

I rebuilt my gears myself and the second oil change i still have a bit of metal gunk on the magnetic fill. Seems to be fine otherwise. My diff used to get hot when i first started driving er and id have to stop and let it cool alot but better now.

[@AnJuice219]

does this apply to brand new cars as well? or are they already broken in from factory? I didnt see anything about changing the diff fluid in the manual after first 500 miles.

[@franciscobarraza8095]

he specified, his diff manufacturer, not his stock one, and said is a point of "good practice" but theres no real problem if you dont do it. on your car manual theres the break in period you should follow

[@theravedaddy]

I got a question for ya if you pick this up. Whats the design advantage of offsetting the diff by 40-55mm from dead centre in a live rear axle? Im digging around now for the answer but not much luck. Ive got a toyota crown axle in a 34 hotrod and i was going mad because i couldnt centralise the driveshaft..... until i noticed the diff flange was 50mm off to the right. Toyota also do center and left side offsets too..... why?

[@StunnaTwo9]

When you decide to add more power check out LHTPerformance they specialize in S2000’s

[@rolandotillit2867]

Different viscosity in the diff will change the locking action since it's a torsen diff. The change is subtle, as the difference in viscosity over a straight 90w and a 75w-140 isn't that great. That said, I use 75w-140 in my S as well, and never given me a problem.

[@kevinkevin7860]

Does this apply for brand new sports cars as well? I don't believe i read anything in my manual about having it serviced within the"break in" period.

[@brakedd]

This may be a completely unrelated question but in service information I've seen more than once to do figure 8s in a parking lot with a LSD after a rebuild or fluid change. One of our TSBs involved changing rear gear oil and doing figure 8s in the parking lot. What's that about?

[@EngineeringExplained]

Ahh okay, that seems logical. Doing figure eights would force both sides of the differential to (at different times) be faster than the other side. This would put it through its full range of motion.

[@brakedd]

Thanks very much. P.S - solid content!

[@robertkaebisch1283]

When does an open differential differentiate? Assuming equal tire pressure, road conditions etc. How much difference in conditions does there have to be to make one side spin faster than the other when not turning?

[@EngineeringExplained]

When you're not turning (open diffs are great because they allow smooth turning, which happens frequently), they tend to rotate at the same rate. Only if one side loses traction will they be at different rates, in a straight line (or if the tires have different circumferences).

[@hellaspower7546]

Do the same rules apply when you install sport camshafts?

[@miami1393]

Thanks, I've seen those. Had mixed feelings about those, they seem to be too bulky while under the car, how do you like it overall? Had to enter a new comment, it wouldn't allow me to enter a reply.. go figure.

[@jbecker18jb]

I have a 97 camry with 370000 miles. Should i use 5w-30 that it calls for or should i use a thicker oil? Thanks

[@toyotabrony]

Sir ur videos are becoming more astonishing than ever. Keep making these awesome vids. Also can u make a video about Scion xB1 1.5L 1NZ-FE and Scion xB2/xB2.5 2.4L inline-4’s VVT-I explanations? And a rare TRD turbocharger discussion about why it was discontinued a while ago? Thanks man.

[@behelpful1435]

How short should the initial trips be for the first 500 miles? 5 miles? 20 miles?

[@mattiloponen92]

Does your diff have an LSD? Would be a good idea to have one after installing the supercharger.

[@EngineeringExplained]

Yes, indeed it does!

[@mattiloponen92]

Engineering Explained was not expecting any less from you!

[@matthewleising84]

Love the vid man

[@EngineeringExplained]

Thanks! 🙏

[@tannercroft5024]

This is more Motorcycle related, but can you explain what causes the "whistle" exhaust note from a triple?

[@JBaek24]

hmm... would this be required for new cars from the dealership lot too? Or would they have been already "broken-in" at the factory? For example, if you buy a brand new corvette from another state and need to drive 500 miles back home... the diff will get too hot for too long like you said, damaging it?

[@EngineeringExplained]

It's definitely ideal to break in vehicles in a varying manner, rather than a lot of highway miles at the same RPM. I have a video with a few more details: kzbin.info/www/bejne/pZzPon2kopySirs

[@Bugattilover39]

Are transaxles just as good as diffs and regular transmissions?

[@kaivanderbijl4272]

Can the same method be applied to a new car in terms of changing diff and transmission oil after a break-in period?

[@jeremymitchell6224]

Video idea: Discuss the various styles of limited slip differentials.

[@EngineeringExplained]

Here you go! :) kzbin.info/aero/PL2ir4svMoaYim-RSNWEh-aIfdcM6plSly

[@jeremymitchell6224]

Thanks, I don't know I how I missed that one!

[@orlandamartin7120]

Madmax songe

[@rogerbrandt6678]

Shouldn’t of you put the horizontal for running temperature.?

[@ferdykurniawan9857]

Is this applicable for brand new cars as well?

[@Olemrac11]

Is this the same for a front wheel drive car?

[@Robbeerrtt]

Where do I buy your merchandise (t-shirts, etc.)?

[@EngineeringExplained]

Thanks for asking, would love to have your support! :) teespring.com/stores/engineeringexplained

[@Robbeerrtt]

Great, thanks for the link! Keep up the good work!

[@tmo_ls3895]

Actually just bought the blue hoodie he is wearing in this video earlier this week

[@prime6495minister]

Please explain: why more velocity does not equal more hp, since more air can get into the engine (?)

[@tonybowers9490]

Looks like the new one has some impressive cooling fins. Are those cooling fins?

[@EngineeringExplained]

Yes, they are cooling fins! The old one has them as well, they're just super dirty and not as easily seen in the video shots (on the bottom).

[@justinjohnston8704]

Hello, Could you answer a question of mine, what is the width from outside rear hub to hub on the S2000?

[@EngineeringExplained]

I'm not sure, but it would probably be extremely close to the car's width.

[@justinjohnston8704]

Engineering Explained And, what is that?

[@EngineeringExplained]

Here you go! bfy.tw/GUAt .. something about give a horse a drink. ;)

[@justinjohnston8704]

Engineering Explained Im looking the axle in your videos. Im thinking I want IRS in my 59 F100. So, Im going to have questions of this nature.

[@raiden000]

is this also true for stock diffs? my manual for my wrx said not to change it till 10,000 miles...

[@patw52pb1]

Yes.

[@mattf2535]

Hey Jason put in a downpipe, password jdm intake, nst pulleys, and flashpro.

[@hudsondonnell444]

Jason, I'm wondering how many ratio's will work with an S2000 differential?

[@EngineeringExplained]

There are a good number of aftermarket final drive ratio options. I have a 4.44 vs stock which is 4.1. I believe there is also some 3.9ish, 4.57, and 4.77 available. 4.57 is a bit hard to find, which was my original goal.

[@jacob6440]

Would you please do a video on how a locking differential work on 4x4 like Land Rover defenders? Love your videos and would love for you to explain in as they are always great videos

[@moritzaufenanger2537]

Hey Jason, awesome Videos. Could you do a Video about why tires grip up at a certain point even though torque increases most of the times? So I mean you launch the S2000 at 4500rpm and until 5500rpm the wheels keep spinning if you floor it. But then they somehow grip up even though the engine has a higher torque/hp at 5500 than on lets say 3500 while in SAME gear. Thanksn

[@EngineeringExplained]

I'm not sure what you're asking, could you clarify your question a bit? Will try to help!

[@GetTheBugSpray]

I think what he's asking is when you launch a vehicle say at 4500 RPM, you get the initial tire spin (like a rolling burn out) where the tires aren't quite gripping the ground, but when you keep applying throttle and your engines RPMs go up to like 5500, they eventually grip the ground and roll/accelerate like normal. The question is, why does this occur even though the torque output differs from the start when the tires spin, and the end when they finally get complete grip. This all being in say 1st gear. I would think it'd have to do with the speed being different where the initial launch is overcoming the inertia of the vehicle and the speed being almost 0, where as time goes on and you gain speed it allows for the wheels to now spin in a certain threshold at the speed before losing traction.

[@davidhagersten8447]

It is probably several factors that cause the early tire spin. For one there is alot of stored energy in the fly wheel and the engine before releasing the clutch. This means that there is alot of momentum built up before relasing the clutch. This gives a much higher torque to the tires momentarily contributing to cause the tires to spin. On top of that there is a big speed difference between the ground and the tires when the clutch is released forcing the tires to spin according to the gearing. Spinning tires have less grip (coefficient of friction) than rolling tires. So at higher speeds the tires have less relative speed difference to the ground therefor having rolling friction instead of sliding friction while the stored energy in the fly wheel and engine are used up. Conclusion: It is much harder to acheive spinning tires from a rolling start than from a stand still.

[@kazn10]

How is it with a Torsen LSD? Do you recommend it too, not to push the car the first 500 miles? My 308 GTi will have one and now I'm not sure how to properly drive it the first few miles. (I think this car isn't available in the US market?

[@kazn10]

aljowen yes, it's new. Funny. The dealer said, psuh the car in all rpm zones so the engine learns from my driving style. I don't know if it'll be written in the manual. The dealer doesn't really know that car well. He told me that the engine has two turbochargers. But it's a twinscroll turbo. And I've never heard that a brand new car has to be pushed in every rpm. But I don't know good enough. I think he said, that the engines run for about 500 km (I think to get sure that the customer gets a good engine) before they hand it out to me. Thanks

[@kazn10]

aljowen I don't know neither. I don't know their production procedure. Maybe they only simulate the 500 km. Like they pushing the car for few minutes when the engine is cold.. I don't know. I'll ask in a forum if someone knows more about that.

[@eriklehnsherr5784]

Cant go wrong just playing it safe first 500 like EE said.

[@jaydunbar7538]

aljowen if they are putting 500km on each, I'm sure it would be on computerized dyno not people actually driving them around.

[@stanleygodspeed8103]

would you explain what will happen if i use diesel oil on my petrol car???? ( coz i did for several years for my bike, and it working, without using any problem )

[@Omar-Dawood]

Does front wheel drive cars have differential in them like my toyota Corolla 2010?

[@BrianNC81]

Omar Dawood yes you have a differential however, many front wheel drive vehicles integrate the differential with the transmission and share the same fluid.

[@Motorsportsgeek]

WHat gear fluild is better Penzoil or Redline ? Never heard of penzoil being popular with differential fluid, Im assuming he is just sponsored by them.

[@δημοςαναστασιδης]

hi jason !! i have a 99 suzuki vitara and 3rd gear has a problem . When i downshift from 4th to 3rd or upshift fast from 2nd to 3rd i have a lot of grinding noises .. do you know what the problem may be ??

[@metaleggman18]

ploutarxara 4ever sounds like a synchro is bad

[@δημοςαναστασιδης]

metaleggman18 yes it may be but the most times especially from 2nd to 3rd it shifts like a dream !! i want to add some aditives before it needs to be rebuilt !

[@EngineeringExplained]

Likely the synchros going bad. Downshifting will make this much more noticeable unless you rev-match. Upshifting it won't be as noticeable because the engine RPM is falling in the same direction your next shift will be (it's naturally rev-matching, to an extent).

[@δημοςαναστασιδης]

Engineering Explained ok jason i will try rev matching . thanks for your help !

[@metaleggman18]

Engineering Explained that sounds about right. Unless you have actual gear problems (like I did with my 09 Lancer from the factory), you're much more likely to notice it on those down shifts.

[@suryamp12]

I've never seen people put diff oil that has lsd additives into the s2k diff. I heard it might damage it

[@EngineeringExplained]

Pennzoil's is a fairly low percentage of LSD additive, it's not going to harm anything.

[@808smycarbreaks_9]

Is a welded diff a good idea for drifting or not???

[@JarHeadP3]

For drifting, absolutely as both the rear wheels will be spinning at the same speed all the time making it easier to initiate and control oversteer. For daily driving, i cant imagine it being pleasant.

[@EngineeringExplained]

If it's a dedicated drift car, it's not the worst idea. But I think a proper LSD is a more logical decision, as it keeps the car very drivable while still offering great drifting characteristics.

[@mxerable]

I drive an old merc with a welded diff. If you are drifting for fun, go for it. But if you are serious in the sport and have enough power in your vehicle, i would prefer a proper lsd. Dayly driving it is a very bad idea. Think of an slightly wet street. You will be kicked out all of a sudden. And get into a parking spot isn´t fun either.

[@stuartsaunders3238]

Yes, but drifting is not a good idea.

[@808smycarbreaks_9]

Engineering Explained alright thanks, I’ll keep that in mind whenever I start my project build

[@lelouchbritannia8728]

please do some video about.motorcycle. how to incresse topspeed

[@ThrottleJerk]

How about breaking in a new/rebuilt engine? (Particular attention to rotary engine)

[@bruckmike]

When is a Engine more efficient? High rpm and low throttle or low rpm and high throttle?

[@EngineeringExplained]

Neither of those are very efficient modes, but from a brake specific fuel consumption standpoint (BSFC is your fuel economy relative to how much power you're making), high throttle low RPM will have a better BSFC. But there are reasons why you don't want to run super high load at low RPM (like LSPI).

[@cristianaguina4128]

Quick question, does draining diff oil after 500 miles apply to new cars as well? I would assume so. Btw great content as always.

[@biribobili]

Does changing the final drive ratio affect fuel economy much?

[@EngineeringExplained]

Well it will generally put the engine at a higher RPM, which tends to put it in a lower efficiency operating condition. BSFC (which correlates with fuel economy) tends to go down as RPM gets higher, so highway mileage will be affected by a higher (numerically) final drive ratio.

[@TheBTRGarage]

Perfect! Should be getting my OS Giken differential in a month or so for my BRZ!

[@EngineeringExplained]

Nice!

[@jeffklaubo3168]

how about a video on how throttle body spacers work

[@SeanSurajJeremiah]

I don't get the part about not going on long drives. Doesn't short distance travel induce more load and wear on the on the system as it would barely reach optimum operating temperature? And wouldn't the amount of heat going into the system taper off and reach an equilibrium with the heat being dissipated at some point long a long drive?

[@EngineeringExplained]

Once it's broken in, yes, your logic is absolutely correct. But if there are high wear spots that are creating a lot of heat, it's best to let them cool down, rather than prolong the high heat scenario. It's also good to have varying speed and conditions (just like for engines), rather than long highway miles.

[@SeanSurajJeremiah]

Engineering Explained Makes sense when you put it that way. Thanks Jason.

[@miami1393]

Do you have a lift in your garage? Or is it just on jack stands?

[@EngineeringExplained]

It’s called a “quickjack.” Kinda a mix between the two.

[@JukkaKivinen]

10years ago i installed new lsd. after 5min driving i was doing donuts with that and 1.5hours home in spirited driving. No problems.

[@Ent4Udeepakyadav]

Very nice and technical video

[@RootsandTendrils]

Great Info and Advice, thanks

[@georgekuetsten8030]

Isn't 75w-140 actually a thinner viscosity, with a higher lubricating ability , due to more additives like zinc ?

[@EngineeringExplained]

75W-140 gives you the viscosity grade. 140 at operating temperature is a higher viscosity than 90.

[@zfreak2808]

But not enough power to beat my turbo miata. Hey, as you put more power on the car, go into why engine mounts and differential bushings need to be upgraded. I had to learn that the hard way.

[@EngineeringExplained]

I replaced the diff mounts when I swapped in the new diff, and in fact the original mounts were still fine even at 15 years old, so on that front I should be good!

[@zfreak2808]

I'm only running 8 psi on my 2.0L miata and the drive train hop in 1st gear at the strip is bad. All the mounts look good and it isn't a problem on regular old pavement, but the strip is so sticky and there is so much power in first gear that the whole drive train hops if the tires are allowed to slip at all.

[@laosonick]

What kind of diff did you upgrade to?

[@EngineeringExplained]

Still a torsen LSD, but from 4.1 final drive to 4.44.

[@GarageSupra]

If you have a Torsen/mechanical diff DO NOT USE FRICTION MODIFIERS in your oil! Use only the recommend viscosity oil. If you have a regular clutch type LSD friction modifiers are ok. If you are finding you are overheating your diff oil use an aftermarket diff oil cooler setup,

[@quinnsorensen1346]

How often should change the diff fluid

[@EngineeringExplained]

My owners manual recommends every 15,000 miles, best to check yours to see what the requirements are for your specific diff.

[@task5147]

Looks like you're gonna boost the S2K. Make a video comparing a turbo vs a supercharger, then eventually do it to the S2000! 👍

[@Pspgamer789]

Thanks so much Jason!

[@maverickwarden]

Is it true that if you do not change the diff oil within the first 1,000 miles then not to do it because at that point the diff is used to the metal residue thus it will damage it if changed? I find it farfetch.

[@EngineeringExplained]

Fresh oil is never a bad thing. Wasteful if you do it too often, but won't damage the vehicle.

[@Burroughsbikebuilds]

Same process for a Torson differential?

[@Edumacation95]

show your install and mechanical vids!

[@McHighler]

Very good advice