put my new bc coilovers on and adjusted the fronts so the wishbones are level the back i think needs to go 15ish mm down to match the arch gap on the front. the tracking is set at zero toe and the front camber mounts set at factory neutral position.standard arb's an 18inch wheels an 205 rear diff. but i drove it to pwllheli last night with some spirit for the first time because my old suspension was shocking! and on a damp road the old girl drove very well but understeered like a *bleep*......any ideas?

I would say that you need about 1.5-2 degrees camber at the front

I have all 4 spring/suspension heights the same, 2.5 degrees camber at the front and zero/parrellel toe all round.

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Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/

Double topic post
Dale's reply reproduced below:

_________________
Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/

Will wear the insides of the tyres very quick with road use, I used to run about this on my old escort.

If you can soften the front or stiffen the back should help.

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If at first you don't suck seed, try drier grain.

That's interesting...I actually run 2 clicks less (TEIN SS) damping on the rear as opposed to the front (i.e. harder setting on the front).
I do play around with tyre pressures though, i.e. @2 psi less in the rear tyres than the front.


Suspension and setup is a black art

_________________
Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/

im not sure tyre pressures will help with this amount of understeeryness! im not saying its really bad,if i go into a corner with 4000rpm an use the power the front will go where i want it, but if i coast in or balanced throttle then it wants to push on,and im running out of boxer shorts! the front tyres are fairly wide 225/40/18 i think the rears are 255/35/18 altho i dont think they are particually good make......hedge-finder2000's!

And you wonder why they just let go in the damp. Even a good make will be a bit unpedictable on slimy stuff.

My experience on 4's is that you need to go into a corner on trailing throttle / light braking to turn in otherwise it's understeer all the way. 185 worse on tight corners than 205.

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If at first you don't suck seed, try drier grain.

does it feel nervous in a straight line?

It is an understeery chassis by design with huge front weight bias but it should grip well on a good surface with good tyres. Daiyeung ditchfinders in the wet isn't a benchmark but if things are bad in the dry it's probably worth getting a full alignment check

on smooth stuff it feels nice an pointy with no nervousness,on worn road surface it likes to tram line abit but i put that to the tyres being wide. it does feel a little wooly on dry roads aswel but i was pushing on abit.

Well that I wont help for a start - in my experience the 4's prefer having equally size tyres all round.

_________________
Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/

well thats a bugger because my wheels are different widths! not sure how that would make it understeer like it does?

Mixing different size tyres on a four wheel drive car is not normally recommended. Even a slight difference in the rolling diameter will do the centre diff no favours. The mechanical and handling consequences can be unpredictable.

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Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

i'll double check the tyre sizes in the morning because im pretty sure the rolling radious is the same front to rear.

http://www.tyresave.co.uk/tyresize.html

1mm different diameter, so unlikely to cause a problem.

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If at first you don't suck seed, try drier grain.

i do have a set of 17s that could go on so i could fit equal size tyres but i really like my 18s but if thats the way to get it to stop understeering then i'll do it. but i carnt really see how the 18s are causing the understeeryness?