actually I think the GTA *grips* very well (as in cornering g), and that its *traction* under power (especially noticeable for tightening curves) was what needed addressing - and I think a high quality LSD covers this.
BTW The GTA doesn't really have too much electronic aids , the VDC system for the 147 is not present in the 156. Apparentlly it can't be switched off for the 147 which would infuriate me. Thankfully the 156 doesn't have this but then again it has a longer wheelbase so its a bit easier to catch slides.
It does have a very well judged ASR (traction control) which can be totally disabled for the track, and once the wheels are warm on the it just needs a little sensitivity to avoid excessive wheelspin. I find with the Autodelta LSD fitted its actually tough enough to break grip with good tyres!
BTW 250 bhp is nowhere near the usable limit for a well setup GTA with LSD and quality springs/dampers.
The GTA suspension geometry and wishbone construction is probably a bit different to the standard V6 setup I think so it will be interesting to see how your assembled monster performs.
The GTA ABS calibration seemed pretty well set-up to me, which was at a more aggressive setting than for other alfas I drove - are you modifying this aspect of your to cope with the extra power and braking capabilities you are adding?
RE the tyres - With data logging I am seeing just about 1g max lateral acceleration with the PS2 tyres which is pretty good I believe .This was with the AD sportline coilovers (road springs). I didn't have the data logger when I had the GSD03s, but my seat of the pants estimate is that the PS2 were the best (and defintely had the best feel).
If its conering g's you are after, the more you lower the car obviously the lower the centre of gravity and the greater the cornering g's you can get, but you have to compromise Vs ground clearance, and possibly avoidance of fouling the wheel arches under full suspension compression.
I'm not an setup expert (or expert in anyting car related in fact
) so I'd recommend talking to a track day preparation shop.
Probably the guys you are dealing with should have at least some guidance?
Am interested in how other guys with coil-overs have got on, am sure the more experienced guys on this site would have useful info.
Hmm maybe this should be a new thread?
Originally Posted by Peter K
Comming from Actual GTA owners, it's interestesting that you both agree the GTA would benefit from more grip. Since my car does not have any of the electronic aids you have in the GTA, it really makes it obvious how much trouble i would be in without an LSD.
Anyone else got some good advice as to how i ensure maximum grip at the front?
I really dont want to go above 17" tyres. I do a lot of hard driving, and even at 17" I seem to spend a small fortune in tyres every year.
So far i've gone with Michelin Pilot Sport II. Where do they rank when we are talking grip, compared to similar priced tyres?
I've got KW Coilovers Variant II on it too, so maybe i could play around with different hight/rebound settings, front to back ?