I am going through my suspension and will eventually need to realign the car. I have always used about 1/16" of toe out in race cars. Seems to give better turn in but can make a car "hunt" or dart on the straights. I was reading the Radical manual and they suggest toe in on the front. This would make the car feel better on the straights but what of the turn in?
Please discuss......
Toe in?
I was told 1mm of toe out up front and 3mm toe in at the back by the guys from Spring Mountain.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming 'WOW-What a Ride!'"
Keep in mind that the Radical RS manuals are giving the set-up information for Dunlop tires and Spring Mountain is likely giving information on set-up for the Michelin tires. The alignment is very different for the two tires.
Charley
Ah, point well taken. I'm in an 8 with Michelins.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming 'WOW-What a Ride!'"
Are the Michelin's and Dunlop's radials? I am running Hoosier bias ply slicks.
I've got Hankooks on my '8. I am quite interested in alignment differences between tire brands (and why).
Are the Michelin's and Dunlop's radials? I am running Hoosier bias ply slicks.
Yes they are both radials.
Charley
I've got Hankooks on my '8. I am quite interested in alignment differences between tire brands (and why).
There are a few differences. First the tire size is different. The sidewall stiffness is different. And the edge design is different. When Spring Mountain first switched to the Michelins they used the standard Dunlop alignment and the Michelins were slower. They experimented and found an alignment that they say is faster than the Dunlop’s and lasts longer. I don’t know if that is fact or marketing hype. The most noticeable visual difference is the Dunlop’s use much more front camber.
Charley
Without wanting to add complexity to the subject, we've been trying out Pirelli P Zero Corsa tyres on our own rental cars and on our customer cars (SR8 and 3's)... We've been using standard Radical recommended setup (as for Dunlops) with great results (also on pressures)... The DM (Dry Medium) pirellis don't seem to last as long as Dunlops (maybe 30% less track time) but the grip seems to be on par if not better. Not tried any other components on slicks but they are available in H, M, S of SS (Super soft). As a side note, I think the Dunlops are comparable to M's in the Pirelli range. Pirelli's also seem to require slightly less warm up times.
We are also considering to reduce the front camber slightly as the Pirellis seem to wear a bit lot more on the inside.
In the Pirelli specs, despite being notes as 25 mm wider than the Dunlops (both front and rear), they appear to be only about 5 mm wider when places next to each other (Pirelli and Dunlop):
Front: 225/580 x 15
Rear: 285/605 x 16
https://www.pirelli.com/tyres/en-ww/motorsport/catalogue/circuit
