New 5EXI - stability issues at speed

[gw302]

No- my car wasn't built with a rover as a donor, it was a SEAT Leon. I'm running new wheels with T1Rs on them.

It doesn't seem to have a prefered direction to wobble towards - it resonates from left to right across the road from the front - the equivalent of a 'tank slapper' according to someone I had in the passenger seat at the time....

[limpabit]

Try 20 psi all round. Swap the front to rears etc.

[bigrich]

20/30 psi too high.

I'd drop to 18 front, 20 rear as a trial and go from there - depends on tyre size and profile.

I'd be concerned that you can move the steering wheel that much with no wheel movement- something is not right. Track rod ends tightened up fully on rack and uprights? Joint play?

....the alignment really does alter things along with camber...for example when I first SVA'd mine I had about 1.5 deg neg camber and 2mm toe in on front.....the car wandered something terrible.

Suggest you spend some time setting up camber and toe....mine is set at approx:-

Front camber - 0.25 degrees neg
Rear camber - 0.5 degrees neg

Front toe - parrallel to 0.5mm toe out.
Rear toe - 2-3mm toe in.

This is similar to elise setup (check SELOC for different elise geometry).....pity that Marlin don't have a reference setup :-(

RIch

[limpabit]

Let us know how you get on George.
Can you post any pictures of your car?

Do you have harnesses fitted by any chance? If so could you post some pictures of how you have fitted them?

[nutter]

Hi George
Pleased you got you car through IVA.
As with you i found that the seat leon 17" would not fit.

If I am correct do you 16" rims on the rear and 15" on the front? I have been chatting with Mar recently about tyres....

What tyre sizes do you have? What rims do you have?

You wont be able to swap fronts and rear if that is the case.


Im also interested in the harness pictures, and particulary the height and fitting of the bar between the two roll cage uprights