chaps, you may know me but i have a STi 5 type r that i am very proud of but in recent times i have been getting a little worried due to me very noisy transmission when turning in small spaces in first gear?

there seems to be a real clunking sensation along with the noise when i turn the car, i am not sure what this could be ? is it the adjustable diff comming to haunt me as that is where it feels like it is comming from or could it be as simple as a cv joint?

any ideas or comments gratefully recieved!

dave

 

It could be the rear LSD clunking. Mine does it round very tight corners.

 

it could be but it does it around the most normal t junctions, i am planning to take it to TSL for a little expert advise, is the LSD a usual thing to go bang on this model?

 

What setting are you using for the DCCD in these situations? You should back it right off during parking/reversing and other manouvres involving lots of lock and/or slow speeds.

If you're still getting odd noises with the diff backed off, then the likeliest cause of the noise is probably a worn outer CV joint on one of the front driveshafts.

 

i was unsure what setting top have this on when i purchased the car so i rang around a few places and i was told.....

always leave it on the botoom setting on the dash clock, which would be the rear wheels doing the work, having said that i have had a fiddle once or twice and it does feel better on the 'LOCK' function when doing manouvers.

is this what you mean?

 

You don't put it on lock for slow speed manouvers.

This is contrary to what the DCCD is for.
This will cause wind up .
And will cause permanant damage

Read John Felsteads Excellent report on this.

http://www.scoobynet.co.uk/bbs/thread.asp?ThreadID=143750

 

well, i rad johns translations and went and had a play, i am now happy that the clunking i haver is not that of the dccd as that makes a slightly different sound, next stop the cv joints!

any other opinions?

 

No! What you were originally told is correct. You should leave it on the bottom LED on the dash when you're pottering round.

This setting doesn't have the rear wheels doing all the work, it splits the torque 64:36 in favour of the rears, so it's still a four wheel drive car, albeit with a prominent rwd bias.

Turning the roller the other way will almost (but not quite) lock the centre diff, which can result in the diff "fighting" (the odd noise/clunking you experienced) when you're manoeuvering at low speeds.

Running with the diff locked will also encourage the car to push on (understeer) under power and is generally not recommended unless you're driving on very slippery surfaces.

If you experiment with the roller position on a quiet country road () you'll soon notice how it affects the handling. Running with the indicator at the bottom of the display will, thanks to the rear drive bias, encourage the car to oversteer (both on and off power), while running it further up will make it more and more neutral/understeery and give you more confidence under braking, albeit at the cost of some turn-in crispness.

[Edited by greasemonkey - 8/11/2003 5:54:24 PM]