by Alby » Tue Jan 25, 2005 5:27 am
Hi Alpineandy,
Just a quick response for now. My V6 was 3 stud, all 4 cylinders are 4 stud. On the V6 I used 15x8 wheels on the back and 15x7 on the front with Yokohama 032 tyres all round, 225/50 on back and 205/50 on front. I used Performance mags (minilite lookalike) drilled to suit the hubs. These wheels are a bit heavy and am using the same sizes but lighter wheels on current car. Wider wheels would have been a waste of time as 15 inch semi-race type tyres (the largest diameter I could go for under our rules) don't come in larger than 225 widths.
I found I was getting bad brake fade after about 3-4 laps of most circuits so went to larger (around 290mm) ventilated discs with RX7 front calipers and a mixture of the original front and rear calipers for the back. This was a fantastic set-up but possibly overkill and large discs are heavy. I'd now try larger discs (but not as large) but stick to non-ventilated at the back, or even experiment with just other pad types and cooling ducts. I'm putting 273mm peugeot 505 disc's on my 4 cylinder which is nearly 200 kg lighter and has peugeot stud pattern.
I left the rollbars alone but used 20% firmer springs all round with adjustable Koni's and heights - after experimenting dropped the ride height about 1 inch all round. Tried much firmer springs initially, but whilst these were good on the track, they were way too stiff for tarmac rallies or for road use.
The final suspension set-up as described was excellent. Still road useable, great on tarmac rallies, pretty good on the track. However, it was very sensitive to getting the rear ride height correct. The engine in these is a bigger proportion of the overall weight than in a GTA and the rear suspension is not as developed as on a GTA. Further, height decides the amount of negative camber on the rear wheels unless you get adjustable arms made which can be a rule problem and is expensive.
Too low and you get an understeering car with snap oversteer when the heavily negative rear finally decides to let go. Too high and you get lots of oversteer but better progression. Just right and you get a good balance between these two but it will always be a car that understeers coming into a bend and oversteers under power coming out. Unless your the last of the late brakers with lots of trailing brake in which case it just oversteers everywhere which is a lot of fun but not that fast. No matter how right you get it, it will always be a twitchy car in poor conditions (eg wet) but nowhere near as bad as a 70's or 80's 911. I've had one of these and far prefer the Alpine and plenty of times beat or passed 911's on rallies and track, including 911 turbo's which are even worse.
Thats it for now - got carried away but would love to see more Alpines in competition work so hope it helps. The 310 V6 is a great track day car even in standard form whilst the above mods make it competitive with much more modified cars. If someone tells me how to post photo's I'll put some up.