Right has anyone had this i got some wheels from a guy who has an rs500 and he had comp mo's which are 18"x8" with 215/35/18 toyo t1s's i have fitted them on my saph and shite its unstable lol i have done the tyre pressures and tracked it but still a little freaky at speeds??? i might go and do the tracking again see if i can fine tune it help lol

 

is it on standard suspension?

 

Koni adjustables

 

Unstable in what way twitchy wandering all over the place ?, mostly rear end has a life of it's own ?
tabetha

 

215's wont be that nice on a 8j rim. Id fit 235/40/18 Then toe in 2 degree on the tracking unless you have adjustable TCA's and Compression struts. etc.

 

John means tram lining Tabetha

 

Are the tyres used? As in, did they come with the wheels? If they are then it could be that, I bought a set of wheels a few years back with really good used tyres on, I put them on my car and it was horrible, tramlined everywhere, I changed the tyres for 4 new ones and it was perfect!

 

Different tyres will tramline to a greater or lesser degree, there can be a huge difference from make to make, just have to put up with it, just try tweaking the pressures slightly either way, may improve things, as well as softening suspension if adjustable is also worth a go.
tabetha

 

it tram lines like crazy and i was doing about 100 mph on a really long bend and lifted off the gas and the back end stepped out it was pants in bum whole moment but i held it :/ when i had the rs'7s on it was lovely to drive i am defo thinking of beffing the tyres up but was going to smoke these out first then probably go for some 888's

 

Are you using a poly diff mount ?, if not then don't expect anything stable as you are being totally unrealistic due to the shit handling car the cossie is as std, if wanting ultimate stability get a 22mm rear arb, you simply won't believe the difference.
No doubt owing to the lower profile tyres they are following the road more accurately just the jelly on a plate wobbly chassis bushes can't cope with this.
On a private road I've done 150 on roads with repair patches etc on long sweeping bends and the car is one of the most stable cars I've had, with a 22mm rear arb and poly diff mount, it's horrible driving a car from the back and front at the same time, having to account for what the rear is going to do in relation to the front, the only certain thing is it won't be doing what it should be doing!!
tabetha

 

How much is a poly diff mount?

 

I think they are around Ł110, but shop around, as a few different ones on market now.
tabetha

 

Tabetha, your a clued up fella

Any pics of your car?

 

Is your car 2wd or 4x4? just out of interest

 

Mine looks 100% standard mercury grey 2wd, engine less at the moment, back in this week though, just had it's 200,000 mile overhaul, awaiting machine shop to finish my lightened slotted flywheel, engine is fairly std T3/34, T3 compressor housing machined out to take a T34 trim, std .48 turbine, lightly modded head, ends of inlet tracts cleaned up, raised CR, std cams and the usual stuff, running emerald K3 on greys, 100% spot on, emissions were 0.97% CO, 137PPM with 200,000 miles on engine, bores were so worn they nearly missed 1st oversize, and jumped to 2nd, could still crack 40mpg though, just need new clutch/box, and wheels to fit my 330mm 6 pot tarox brakes, once run in at around 380bhp, when remapped, I kept the boost low due to the mileage, is only 17/18 at the mo.
Oh and i don't know how to upload pics ha ha!!
tabetha

 

thats a very interesting spec, how comes you went for raised CR? Does it work well like that? Not the norm i rekon

you can crack 40mpg?!?
you must have an interesting technical background as you are always helping people with their issues on here

I cant beleive u cant post pics!