the reason is because the RS is a fully homologated version. So the rules in rally, you can not have an electronically controlled rear diff.

Nothing is bulletproof on the market the Evo drivetrain is one of the most robust one.

the reason why so "many" brakes usually follows at least two of these:
super gripping/ wider tires
harsh clutch system
poor driving skill.
added high hp

on the market the STI edges out only the evo drive train by a margin, but it does.

nothing wrong with the AYC and the ACD, period.

you can put 3 continues track days / driving with "journalist", and only stop for refueling. Evo drive train and engine wouldnt even blink on it.

that is i think true for the STI and many other cars.

 

The pumps fail with old age or condensation/water getting in them. The clutches themselves are not what fails. I asked TRE about it when he first built my tcase, he said ACD clutch failures typically only happen when a car gets towed improperly. Sometimes the seal leak, but not often.


So the parts that fail aren't the parts that are absorbing torque. So, it's mostly irrelevant to the Focus RS.

 

I would say the ACD pump failing is a bit different than the differential grenading.

 

Clearly, my point was that the ACD system adds complexity and more components that can potentially fail. Some people feel it is better to remove it. Whether to reduce weight, reduce items that can fail, or that the person prefers the way the car drives with non-ACD.

 

I feel like the electronics integrated with the drive system are what makes the evo what it is. That's why I like the ACD boxes/mods that people talk about.

I also understand people who want to optimize for their particular use, but that doesn't make the system less than pure mechanical systems. Under race/controlled situations the fixed nature is an asset, but that's not my arena.

 

Better remove MIVEC too, and the whole turbo system. Wouldn't want an intercooler coupling coming off.

 

the EVo AYC and ACD system is perfect for weekend warriors. Pro racing still the ACD is much appreciated. AYC many times removed, because the rules or the price to replace it. In Pro or semi pro racing the parts price are important but more the replacing time. So the AYC vs the mechanical diff like the Evo RS model has are cheaper to replace and easier. ( rule of K.I.S.S )

Drag racing I don't care, but I am sure the AYC is much less reilbale then other beefed up mechanical diffs. I am not sure the OEM IX is actually that much stronger. I would assume drag racers using different brand diffs then OEM. I might be wrong. But it would be a real testamnet if they would use over 600 -700 and above whp sticky tires with OEM rear. But I don't think so.


So for the Ford RS I think the rear will be an issue for drag racing too. But I am not an expert neither I am a follower of drag racing. I am highly emphasize that so don't get my word on those drag comments. I just saying it as my opinion what I gathered in a past years.


I am just kind of surprised about the fact , the car is not on the road yet , and yet we already hearing problems, from ford and journalist . And not one one.

 

Quite a few top tier circuit spec Hondas disable vtec (which is the same as mivec wouldn't you agree) to run a big cam 100% of the time to remove the point of failure and support reliability in that platform.

Even some mirage/cyborg mivec cup cars were modified this way... so its really not that outrageous or impossible. I suppose it depends on how far you really want to go and what you think is reasonable.

 

Quite a few are deep into the 10's and even high 9's on the stock rear diff and evo 9/rs front diff on hoosiers. But when they let go.... HOLY $$$$$ they let go!!!

 

I have one video when I am at the start line at a SCCA hill climb race and the rear diff blows up when I launch it. lol

It happens , called it racing

 

I'd prefer a mechanical LSD as opposed to the ACD setup. If I ever need a repair, I'll look into it.
I like the idea of tuning the ACD, but I can't imagine that I, personally, would notice the difference?
Less fluids, weight, etc would be a bonus.

 

ACD tune is makes a difference but not that much when you actually get a racing ACD ECU unit.

Those making a huge difference. Specially when you barking and cornering.
You would be really amazed by it, but more of your lap times In drag racing I don't think would make any note worthy difference.

But of course you need a right map for you and for your set up .

 

I honestly can't comment on drag racing an Evo. I've only tried it once LOL. The only thing I learned is that I suck at launching my car.

 

we do launching in rally - hill climbs, but its not like neck to neck its just a launch like this in the Day before race called Shakedown. Remind you I do this with my car since 2009 and been launched hundreds and hundreds of times with 480 wtq. Skinny but grippy tires.
I am still original ACD fullr front and transmission but the clutch, and OEM rear IX diff. ( bit revised , but no other components in only OEM) I blew in years only one rear diff. Also I want to remind everyone I am buying only USED rear diff.

so no , nothing wrong with the Evo ACD and drivetrain.

rally shakedown:

hill climb:




I don't know how the OEM parts at the rear will do when you do let say hill climb where you can run OEAM parts like electronically controlled rear end. And you will launch 10 or more times a day.

 

Rob im going to contact you in a couple hang tight I have an offer for you.