GrahamF

Can anyone tell me what sort of front diff the impreza has? I have a noise on hard cornering which sounds like momentary clutch slip, but it isn't the clutch. Does the diff have any sort of plates which could be slipping under load and giving a sort of screeching noise? Or any other suggestions? Doesn't happen in a straight line, only on left hand bends.

Graham

MorayMackenzie

It kind of depends on which model of impreza you have. certain models came with a (probably optional) clutch type front diff. Most subrau imprezas, however, have open diffs up front.

Moray
bbs.22b.com

RT

Which model do you have?

To my knowledge, all the recent 220hp turbos only have viscous diffs rear and center. They should not click or clunk. The front diff is an open one which should not do so either.

Some GC JDM models have mechanical diffs. These can be noisy in tight turns, but usually only the very hardcore-racing-spec-clutch-type ones. I'd be surprised if STI fitted a noisy diff as an OEM part.

The new BUGEYE STI has AP Suretrac diffs. Have been trying to get more info on this and how it works, but have been unsuccessful thus far (can anyone explain or provide a link?).

Kevin Greeley

I thought *all* diffs had gears/cogs in them.

The viscous or clutch bits just provide a force to stop the left output going at a different speed as the right output. The force is proportional to the difference in speed hence 'limitied slip' diff.

http://www.howstuffworks.com/differential6.htm
http://www.howstuffworks.com/differential7.htm

Vernon P

My 94WRX has after-market limited slip differentials fitted.
When I bought the car they had been 'shimmed up' such that when turning at slow speeds they clunked and clicked really loudly.
I have removed the shims from the rear but have yet to brave the front. This car definitely does not suffer from wheel slip though!