GT3 MkII Set up?

[jeweller]

Need some advice, getting loads of conflicting info on geometry set up on GT3

Standard LHD MkII CS, Pagid RS29 SRF fluid, Michelen Pilot Sport N2

Where do you go for a good base set up? Also advice on ride height and tyre pressures for the track, I have noticed some rubbing marks on the inside of the rear wheel arch and I was getting turn-in over-steer on fast bends last time out at Bedford, are they connected?

Was getting some understeer aswell (I put this down to bad driving though!)

I know the anti-roll is full hard front, and one off on the rear, my ride height also looks higher than the other GT3's I see.

Just ragged the tyres it came with, Pilot Sport N2, chewed up on the inside rear down to the metal, fronts fine. Again too much neg camber or is it rubbing?

New Champion RG5 wheels with Toyo R888 will be on for my next day (Donnington 17th Nov)and will have the brembo floating disk upgrade when the cracks get even bigger on the OEM discs!!

All advice welcome. I am not happy with just handing the car over and being charged when I am not sure what the problems are. I had a base set up (Wheel alingment, corner weight and flat patch) but I am not convinced about what was done, hence I wont mention where the car went!

PS Please avoid the usual spend money on driver training, poor technique, etc. I do spend money on training and know that a lot of issues can be cured with practise!

[slippydiff]

Try the usual suspects Parr or JZ Machtech.
I've used JZM to set up my Mk1 GT3 (which was a total mare to drive when I first purchsed it, ( the transformation was phenomenal.
I'm no expert, but having your front ARB on full hard would most likely be increasing the understeer you mentioned.

[ULTIMA69]

Hi If you are in North of England Tech 9 at Hale (Liverpool) are very good and european GT3 Champions also www.tech9.ms they have sorted my Mk2 and can fit RSR bigger front brakes. Dave

[Dave 321]

Hey Jeweller, your roll-bar settings depend on your driving style/suspension setup. I have front bar on third setting (2 off full hard) I used to have rear on full hard till I had H&R nurburgring kit fitted. Now i have it set at one off full hard.

Mine used to rub rear arches at the ring' under hard driving. (Not anymore with stiffer springs)..
If you check out EVO mag this month they mention the arches rubbing in the new RS, dont think this is too much to worry about. That said maybe get rear bumpstops checked??!

Rear tyres will wear on inside if track setup is used. You need lots of negative camber to suit track tyres for when they "load-up".
Great cars on track when you get used to them, I found different driving style needed compared to front engine rwd. ENJOY

Oh yeah tyre pressures, I always start on 29psi and 39psi and drop them hot to 35 and 45 hot after one lap on road tyres. I found this works for me but everyone is different...

Edited by Dave 321 on Wednesday 1st November 00:22

[timmo]

If you run the pressures Dave said you will end up spinning off the track !
the ideal psi with Michelin Cup Sports are 2.1 or 2.2 all round hot ( and I mean hot )

Pirellis are slightly higher and the Toyos are higher again


tim

[jeweller]

Thanks, I thought 45 sounded a high

[Merritt]

Tim -

Dave said road tyres, not cups.. Those pressures are probably not far off for road tyres given that the sidewalls are fairly soft..

Steve

[DanH]

If you fit Toyos you may want to avoid running too much camber. They don't seem to like it, and they also seem to need higher pressure than other trackday boots. Got my first trackday on my recently fitted 888s this Saturday. Others have reported fairly alarming inner shoulder wear running low pressures with quite a hefty dose of camber.

[Dave 321]

Merritt said:

Tim -

Dave said road tyres, not cups.. Those pressures are probably not far off for road tyres given that the sidewalls are fairly soft..

Steve

Hey Steve, I was thinking of buying BBS LM's, what widths did you buy?? Tyre Sizes??

Did you find any difference in handling??

[Merritt]

Hi Dave-

Ive got a MKII car so the following wheels are almost an exact fit:

Rears: Part no. BBS 5382098 ref LM132 DS/K size 11.0 x 18.0 fit fine no spacers

Fronts: Part no. BBS 5382096 ref LM130 DS/K size 9.0 x 18.0 : The offest on these is ET50 rather than ET40 as on the standard so require 5mm spacers

There is no noticeable difference in the handling but then I have never compared them back to back with the same tyres and setup (I always run Corsa track tyres on my BBS rims whilst running Michelin road tyres on the standard ones).

Im not sure if these sizes are correct for the MKI and even if they are, you may need the arches rolled... Im sure JZ or Parr will be able to tell you though.

BTW - thats a great shot of you at the ring in your profile

Steve

[Dave 321]

Cheers Steve! Looks like you have a good bit of camber on the front of yours..??!
Tried the corsas once at the ring, i found them pretty good for wet/dry grip. Mite try cups next...
Better start writing to Santa for new wheels and tyres!