Rally Car Racing - Subaru STI Rally Car Explained

[@koolio143]

I'd love to see some more videos on rally! It's definitely my favourite type of auto racing

[@EngineeringExplained]

It was awesome to watch!

[@sharpemang]

Engineering Explained could you do a video on why most rally cars are hatchbacks?

[@Nitropain]

It's been two years, but 'Launch Control' on Subaru's channel. A LOT of rally to watch!

[@lrnlrn]

Would love to watch an extended version of this. I know your just scratching the surface of what makes these race cars so unique and cool

[@EngineeringExplained]

Didn't realize the audio sounds like it's from a Yak Bak from 1995! Sounded much better prior to uploading - know that I've noted this and will approach audio differently in the future. Always learning, hope you enjoyed! :)

[@zenwuu]

Makes me proud to be an owner of a 15 sti. I'm wanting to get into racing, and then rally soon. Thank you so much for all your videos they are all great and very educational. The thing I appreciate most is you always prove thing with tests or explanations. Thanks!

[@andreagili4589]

I loved this vide and would like to see a longer, in depth video about rally cars. I know not everybody loves rallys but that would definitely leave a mark here on youtube. Just my two cents... an italian follower

[@wmc9722]

This is a really well prepared and well delivered primer on the subject. Watching rally cars on KZbin shall be a richer experience after seeing your video. Great job! Riches in your future....

[@MrRangerZr1]

Yes finally! Show video clips while you are talking, it makes it more entertaining to watch

[@pkonneker]

This is awesome. One of my favorite videos. Cool to see how a real track machine is designed. Much more pragmatic than I assumed.

[@ShafiqAdli]

Learned something new today. Thanks man!

[@fraxonthefurry21]

This was really interesting, fun video.

[@EngineeringExplained]

Happy to hear it, thanks!

[@cougarstable73]

Awesome! Now you've got to do trophy trucks, rock crawlers, and prerunners...because off-road is where it's at! Love your work.

[@benjamingazdik]

I love this episode!! Racing is everything to me, about cars and honestly in life, I wanna go fast and win races. So if you were to do more of these I would NOT be opposed!! Very good episode sir, very good!!

[@Hunedpcl7]

I liked how you explained a lot and kept it under 4 minutes. Good video.

[@gandhi770]

Can you do a video on rally suspension? I am very perplexed on how the suspension can be softer but more stiff? What makes rally suspension not bottom out over every bump?

[@WolfJustWolf]

Hari Gandhi The larger suspension travel will take care of that. He mentioned 5 times as much travel as the stock suspension. I'm assuming this is for gravel setup and the tarmac setup will be considerably harder. And +1 on a rally suspension video.

[@canadmos]

Hari Gandhi Look up some methods of compression damping. I'm not an expert in any way, but dealing with suspension on my mountain bikes has taught me quite a bit and I'm sure its not a stretch to apply the same knowledge here. You have so many factors, including springs weights, position/speed sensitive damping, low/high speed separated damping circuits, end stroke damping etc etc If its anything like my downhill bike, you can have a lot of suspension travel, which won't compress all the way over most things, but have a fast enough compression event and the suspension will compress enough to allow more travel, but also be controlled in a way at the end of the travel so it doesn't bottom out suddenly. I could be totally wrong, so take what I say with a grain of salt haha.

[@xkai69588]

Hari Gandhi To add to what the other where saying I heard that the mounting plates for the suspension are also positioned higher because of how they modify the cars giving it even more travel then you would see even on a consumer XV or an Outback which are lifted higher already than your average car.

[@SideWays8Productions]

canadmos +1 for downhill mtb! Very similar, the springs on cars are designed to take certain weight, travel and shock. Race car springs will have springs with very close coils, making it stiffer, while luxury cars will have a wider gap between coils. Most performance road cars will have a wide gap towards the bottom of the spring to be comfortable at low speeds, and get stiffer towards the top for high speed stiffness.

[@fellowsautomobile9234]

Hari Gandhi For me, all questions concerning automobile suspension can be explained through mountain bike suspension. A rally car is basically a free ride bike, it has a lot of travel, but not as much as the Dakar cars (downhill bikes). Unlike 90% of the cars, you can actually set up your bike for any specific type of riding in a matter of seconds. For instance the free ride bike usually has 180mm rear and around 180-200mm front travel. You have high and low speed compression, high and low speed rebound as well as travel adjust. So, having all that travel means you can have a very wide band of function. For a flowy trail/tarmac, you set up for harder compression. High speed is the beginning stroke and low speed the end stroke, so you would have a touch more high speed compression and if you would like to carry a bit more speed, lower the travel a bit in order to also lower the centre of gravity and have a touch more rebound in order to not bounce around as much and keep yourself planted. For a lot of rocks, jumps, rough gravel etc, you want more travel, suppleness and compliance. More travel, less high speed, more low speed compression so that you may use all the travel but as you get less and less, you do not bottom out. Again, rebound is adjusted to control the way the strut/stanchion returns based on feel and how aggressive the track is. I hope I made myself clear enough to be understood, although I think my analogy could have been explained a bit better but yeah, it's just a comment :) Cheers!

[@claudedottin1312]

I love the variety of your channel. The way it's evolving is awesome.

[@TurdFurgeson571]

Can't wait to see your review and test drive for this car!

[@BankCPlusPlus]

This is different than your other videos, I really like it.

[@snakebyte18]

So happy you covered this! thanks my man!

[@Camhin1]

Did you get to talk to Craig Drew? He is amazing, listening to him on the launch control series is great.

[@EngineeringExplained]

I did not, mostly chatted with the team engineer.

[@AlvaroQF]

Thanks for your videos, I always learn something new and they are really interesting. Regards from Spain.

[@EngineeringExplained]

Alvaro Q.F You live in a wonderful country! Salud!

[@HoaDoan-ez1jc]

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[@MrRoyalestCrown]

Very interesting - the tires, especially! That piece of rubber was made to throw stones away from the car!

[@PartTimeRonin]

The reason Subaru have to use 33mm inlet because of the engine size i guess, other team use 1.6 litre while Subaru's 2.0.

[@lawrencepll76]

I really like the videos talking about racing cars! Lots to learn about them! Keep it up! :))

[@nathangaona162]

SUBARU HAD A PERFECT SEASON FOR RALLY!!!!!! congrats to subaru rally team usa

[@AJohnson0325]

laminar flow uses the cross sectional area with an exponent of 4 as part of the formula. So any small increase in radius is actually increased to the 4th power. That is why what appears to be a small difference in diameter is actually a much larger difference.

[@The_Frizz]

you should check out dirt latemodel suspensions and see all thecomplex and crazy stuff goin on under them

[@ryanmencl]

i've been waiting for the this video for a long time!!!

[@JamieD1994]

I enjoyed this video but would love to see more indepth videos on specific areas of the car (Or rally cars in general).

[@VisceralDisgust]

Please can you do a video on rally setups. E.g. how much negative camber? any toe? damper settings? etc etc Would be AMAZING

[@WolfJustWolf]

Very nice video , as allways. You packed a lot of info in a 4 minute video. :) I really hope you can do follow up videos on this , like you did with the dragster and the Nisan GTR LM. I would love to see a video on AWD rally car differentials.

[@Gameplayery]

I have a question about the air filter, with all that debris, do they use a special method of filtering ? Dual air filters ? TopBased nozel ?

[@timcraig7282]

I would also like to know more. I noticed on a lot of the previous Sti wrc cars and on last years rally America car they have a the air filter where the intercooler normally is under the hood scoop. How do they stop this getting water in it when it rains?

[@ariellewest5024]

+Rasti Al Nope, in most of these cars many of the internals are stock or slightly modified. Unless I'm just thinking of super stock. You really just have to clean or replace the air filter often. Even a high quality filter breathes better dirty than most OTS cheap ones you'll find at a parts store.

[@Andrew_Gregg]

A lot of rally car will actually have the air intake in the passenger glove box area, not the engine bay. Clean air coming from roof air scoop is sufficient to supply it with the air it needs while relieving reduced air flow that would occur as the filter becomes dirtier throughout a stage.

[@Natesholland]

Sweet video! Would love to see more of this stuff

[@MrJewripper]

Top notch video! More SUBARU!

[@PotentialEn3rgy]

excellent video packed full of info! Thanks!

[@MatthewMaranan]

Awesome video and one hell of a car!

[@Synthwave89]

Rally is heaven.

[@vegetawrx]

GOOD JOB PHAT BOI !

[@etheain]

This is really cool man! :) Thanks

[@greym6436]

Great informative vid bro as always!

[@snoopunit]

still waiting for the video to load and i already liked it :D

[@vangt858]

Great video!! I miss my GD STi

[@drifterdatou10]

Love the video and love my Subaru!

[@pindrop]

The anti-lag system does not inject air into the exhaust but detonates fuel to keep the turbo spinning ....

[@KRAUSER0130]

+Darin A. It does, its called bypass valve.

[@KiG1208]

+Darin A. Fresh Air ALS dumps fresh airfrom pre throttle body into the exhaust manifold prior the turbo to mix with a rich air/fuel mixture that is set for when the ALS is activated to create an uncontrolled external combustion in the exhaust manifold to keep the turbocharger up to speed

[@rockron]

Great video, more videos on rally! Maybe something like a rally playlist that would be similar to your F1 playlist.

[@nathancotty4386]

could u do another one of these videos but older generation rally cars

[@yogaexe]

1:07 love that turn. Barely any counter steer.

[@TheDegdg]

Great video! Much love:)

[@aussiefamilybudgetcooking]

Great video!

[@toolhog10]

More Rally Videos Please!

[@prandomable]

from what I've learned in my automotive school class, the closer the cat is to the exhaust manifold the better and more efficient it is. Because Catalytic converter needs to be heat up quickly to 500 fahrenhait to work probably.

[@EngineeringExplained]

***** Right, but production cars on public roads are producing far less heat than these are.

[@prandomable]

Engineering Explained it's because these are really cars and being driven as really cars.

[@JuanRamirez-gu7dh]

I knew much of this but thanks for clarifying some other stuff.

[@nathanyamaha465]

Awesome video.

[@waclosh]

thank you for the insight

[@bulinski1987]

I'm surprised you don't use rally more for explanations given the numerous engineering applications they use in a multitude of environments. I'd like to see more rally/raid engineered videos if you haven't run out of things to explain about them already.

[@olesorensen4433]

will there be more rally videos? I realy would like to see more of these :)

[@holotape]

I was about to comment that you sound like that Engineering Explained guy...but...oh, I’m here

[@Gewehr7]

That was a really interesting video. Learned a lot that I have never heard before. Any chance you have the gear ratios and final drive? I know they are close ratios but I always wondered exactly how close.

[@postmortemspasm]

1:05 You say the anti lag system injects air, but I thought it injected fuel so there is combustion in the headers, keeping the turbo spinning... ???

[@TheMrkiddi]

Dadul Ludad it uses pressured air instead of fuel ignition to keep the turbo spooling, the added air ignites the exhaust gas and builds up pressure to keep the turbo spooling

[@11jet1331]

Dadul Ludad I thought it was to trick the o2 sensors to run the car very rich. This would cause combustion in the exhaust manifold, creating high pressure to keep the turbo spooled.

[@11jet1331]

Eric D If the PCM reads more oxygen in the exhaust manifold, then it would inject more fuel into the cylinder. This would cause the fuel to burn incompletely, then the unburned fuel would get reignited by the hot exhaust manifold/valve. Pretty simple.

[@KillerAngelM40A3]

Eric D Eric 's right, there is no need to "trick" the ECU. The ECU knowingly adds a rich mixture to the cylinders. All available air is then burned with some of the fuel, with the unburned fuel getting pumped out with the exhaust. Fresh air is then injected into the exhaust stream where it mixes with the unburned fuel, and ignites when it reaches its flash point due to the hot exhaust components.

[@Magnacier]

To anyone interested in Subaru rallying, check out the Launch Control series on Subaru's own channel or on /Drive; it's really quite awesome!

[@dacunffuzzledbear_1358]

Thanks I want to be rally racer when I'm older and can afford!

[@TWIRKNOLOVE]

Why does the motor roughly last only 1200 stage miles? Is this some sort of safety precaution gauge in miles to prevent future breakdowns or does the engine literally last 1200 miles before needing to be replaced? Assuming it is tuned properly, I don't see a reason for why it would cause much issue unless they are tuning for the leanest, but shortly manageable, setting that produces the most power?

[@todorpetrovic]

TWIRKNOLOVE Stress lol. The engine spends much of its time near the redline. A road car won't last very long either if it is being driven under such stress. Especially one that's pushing 40 psi boost.

[@shift9303]

***** Manufacturers tune their engines for production cars very conservatively so that they are reliable even if they are abused by some random idiot like me. Even on performance cars the engine setup is still on the conservative side. For example, you can see people getting more power from just an ECU flash. Subaru's rally power plant is much more high strung and they probably limit the mileage turn over to keep the engine fresh and in tip-top shape.

[@BGracerBG]

TWIRKNOLOVE Mainly its because of the stress. Mostly caused by the anti-lag system as it puts a considerable amount of load on the engine and turbocharger.

[@TWIRKNOLOVE]

Peter Vladimirov I thought the stress of anti-lag is put on the manifold and turbine itself considering the combustion is now happening inside the manifold and thru the turbine rather than the motor's cylinder? Correct me if I'm wrong anywhere or if it's related!

[@TWIRKNOLOVE]

todorpetrovic But 40psi is just pressure. The stress would have to come from the torque/power the motor is producing which I thought if tuned properly, shouldn't be much of an issue damaging parts. Especially forged/reinforced/whatever expensive bits are used as preventative destruction. Isn't it only sub 400wtq? I know an early TQ power band is hard on the motor, but 1200 miles?

[@peifferunsx]

It'd be cool to have an explanation of why rally drivers tend to drift their cars around corners, while most road race vehicles don't.

[@AOthman96]

Is there a difference between the cars used in Rally America and the ones used in the WRC (World Rally Championship)?? Great video, btw. Rallying is my favorite kind of Motorsports, I hope you have more stuff to explain about rallying in your future videos

[@RossRS]

Good video

[@corporalwaffles]

Excellent video Jason! Any chance to get a HP/TQ curve for the rally car and overlay it on a chart of the stock EJ20? Also surprised that they use an EJ20 motor rather than the FA20. Perhaps the teams are slowly migrating over? Also how does get 3 bar of boost with such little lag on such a small motor and a restrictor plate? Extreme antilag tuning?

[@corporalwaffles]

Interesting that the EJ20 has gotten to such a high level of tuning. Still the FA20 should easily be able to deliver the 320 awhp as the stock FA20DIT does 223 awhp. With a bigger turbo, injectors, and supporting mods, it shouldn't be too unreliable, unless the stresses of rally are that much greater than track driving.

[@dompling]

IDEA FOR VIDEO: Does electric cars have transmissions and if not why?

[@shadowaries1516]

they dont because electric motors can reach higb RPMs. Teslas Model S motors reach about 14K RPM, and i think have a top speed of 140.

[@timvvs]

they dont need one power goes directly to electric motors which spin the wheels if im correct

[@dompling]

+Shadowaries1 Thanks for The answer! :)

[@hockuspockus911]

Instant Torque unlike an ICE.

[@mutilatedjello]

+Dominic Paré They don't really need them. However if you see his Formula E video he says some of the cars have 2 gears, some 3 and some 4 gears and some simply have one gear. I think it's because the technology is new and the teams are still playing with ideas.

[@niel80]

Im building a rally/baja car, and want to put the cat at the exhaust tip, like in the video.... is it dangerous to daily drive it like that? because of the eat and chanses to cough on fire? because Ive seen them and they glow red... thanks... any information would be apreciated.

[@alexindustries44]

Could you explain about caterpillar engines differences becouse that generates so much force posdate good video

[@kreeden666]

Seems that nearly whole car is different from stock STI. Things like exhaust restrictor and super expensive struts are well known. But there are special sub frames, suspension arms and housings and nearly whole body enforcement not only with roll cage but with some inner enforcers (actually do not know how to call in English cylindrical parts placed in the spars). There is not much information about this in the internet.

[@Montblanc1986]

Igor Bogdanov only Subaru part is the badge

[@AkshayGhatge19]

Amazing

[@beetfarmer8933]

Interesting to hear that they run the EJ20 instead of the EJ25.

[@_BrainRot]

I know this is late but I think WRC is limited to 2.0 L engines.

[@EspressBow]

Pretty sure they used to use the EJ257 not EJ25.

[@ariellewest5024]

I wish that the WRC wouldn't have implemented the rule of a 1.6L max engine size. I liked seeing Subaru in WRC.

[@wittwer427]

How would you go about making the heads capable of handling 40 psi of boost? And then I would assume new pistons and probably 115 octane fuel?

[@Mortalomena]

Why not make this longer video? Pretty crammed, I had to rewind couple times to comprehend things because you blabble along so fast :D

[@philspaghet]

Can they use active aerodynamics? Like air brakes? Or did they choose not to because it's too flimsy?

[@bloods2jzgte940]

14 tires? Sorry for my ignorance but that means 3 and a half sets? I'm assuming the extra 2 cause an interesting dilemma somewhere along the lines but I'm not sure where?

[@TWIRKNOLOVE]

Bloods2JZGTE Gotta keep things interesting/competative :D

[@d3x-dt3]

Bloods2JZGTE 3 sets and 2 spares, I am assuming.

[@SteveCJr]

Bloods2JZGTE If one tire pops you don't need to change the other 3.

[@QuiznosBear]

And to think, wrc is restricted to 6!!!

[@corporalwaffles]

I spy a BRZ at 1:49. Converted to AWD by chance?

[@corporalwaffles]

Any idea of the lap times for the BRZ vs the WRX STI?

[@matrtak_wheels]

@Engineering Explained Did you score a joy ride for doing this? Would love a video of that

[@EngineeringExplained]

psygla87 Nope, unfortunately not. I think they were doing them but I was at an event in Washington when this happened.

[@lachiemcgrath5852]

Engineering Explained

[@lachiemcgrath5852]

Engineering Explained in

[@payneinthebutt3098]

Does the car still backfire with the catalytic converter on the end of the exhaust? Also, I'm going to go see GRC this year.

[@dacunffuzzledbear_1358]

I watched the Indy 500 what's the Big and small differences of Indy cars and F1 cars? Please I have no idea

[@domenicocop7730]

Where could you buy the front bumper, side skirts and hood or were they custom built? Thank you

[@jrhcustom1450]

How do they drive through water? What are the modifications for that?

[@the-real-zpero]

does the antilag system work like any of the ones you covered in your als video?

[@modeup3175]

i think its the bypass valve anti-lag system

[@MossPalone]

With your success as a KZbinr, may I suggest you getting a higher quality mic?

[@EngineeringExplained]

Jude Lau This was a test of a new mic. Clearly a bad mic and it won't be used again. It also sounded better prior to uploading. Cheers!

[@MossPalone]

Engineering Explained I see. by the way, as an undergrat Mechanical Engineering...i really thankful that this channel exist. helps me learn a lot.

[@EngineeringExplained]

Jude Lau Happy to hear it!

[@SteveCJr]

Make sure to check out Launch Control on /DRIVE

[@ProtonFilms_Mark]

Hello there, I was wondering if you could help me lift some shroud of mystery on the matter: it always bugged me, how do rally cars stay level at speed. Is it purely the aerodynamic downforce, if the springs and sway bars are soft for rally stage, why don't we see much in the way of body roll? Supposedly the shock travel is so great to soak up the punishment of jumps and uneven roads, how do they tune the car for combined stages then? I am aware that drifting in snow for instance (as I always do when it flurries a little) reduces the weight transfer, I assume this is also the case for dirt and gravel roads, still curious about how rally cars manage their weight distribution. Cheers in advance, from Russia with love.

[@EngineeringExplained]

Mark Lee It's a combination of everything I mentioned, really. The tires and suspension are specific to the sport. But you'll notice the cars sliding around quite a lot; they're always at the limit of friction.

[@shaesmith9460]

Can you tell me if they make the wheels wells deeper too? I'm a little confused by how the suspension is set up. Thanks everyone!

[@itastain]

Have you seen the launch control series?

[@EngineeringExplained]

itastain Of course!

[@itastain]

Engineering Explained lol. do you enjoy it?

[@a.benaway_racing]

Next explained video..... Anti lag.

[@onixxx1984]

What are the different rules in Rally America compared WRC (which is getting boring with only small coke can sized cars)?

[@TheRadoman]

That possitive camber on the rear tho

[@kameronc7673]

Can you comment on why a Rally car engine Chrips when the driver let off gas, is it compressor surge?

[@nosaj626]

+Kameron C It's a wastegate. It vents unused pressure to prevent it from going back into the turbo. It allows more boost pressure to flow through the exhaust and makes the turbo more efficient.

[@oldfashionedwrx3574]

1200 stage miles is a lot lol also what do they rev too like 4k rpm ? prob makes a lot of torque and 300hp at 3.5k rpm or so. so very punchy and lots of power down low, all bottom end - mid range. can u talk more about rally cars... suspension, air filters, skid plates, steering, etc

[@vincentahlin9989]

Like the hells

[@dingus153]

Should've hooked up with the mad fellas at FYRacing :P

[@node5884]

So beast

[@josebentodecarvalho5362]

does group A rally cars usualy use straight cut gears?

[@tensevo]

nICE INSIGHTS

[@Chaz_Sohc]

Wait, the engine only lasts for 1200 miles? Does that mean they have to rebuild every 1200 miles? Is that normal for rally wear on an engine?

[@cricketcanvas8619]

nice