Originally Posted by PedalFaster,Apr 15 2010, 09:48 PM

Everyone was loose on San Diego's surface. Our car was looser than it's ever been before.

As an aside, I was working the hairpin turn, and either you or your codriver was hanging himself on Sunday by downshifting to first when there was only a fraction of a second's acceleration possible before shifting up (unless you drew it out by busting the tail out, which happened more than once).

Originally Posted by PedalFaster,Apr 15 2010, 08:48 PM

Everyone was loose on San Diego's surface. Our car was looser than it's ever been before.

Originally Posted by Random1,Apr 15 2010, 10:38 PM

The photo below shows the closest I came to swapping ends on my second run on day two of the San Diego Tour. I got behind on the turn just before the turn into the finish and hit the inside cone. The car was more loose than I had experienced so far. I attribute part of that to the higher speeds and significant elevation changes with lots of off camber turns. But what about the car is causing this?

What makes a back end loose? I have a FSB at 200% of stock stiffness. The tire pressures for Dunlops were in the ball park of what others were running. The rear camber is at -2 deg. The rear toe is at -1/8" total. The shock travel in the rear is minimal. The rear springs are 600 lb/in. The rear bar was disconnected and it just provided a slightly higher speed at which the car still felt loose.

The two things I have come up with are to increase the rear toe and increase rear travel in case it's the bump stops (likely). I plan to try -1/4" total rear toe. As for rear travel I will try raising the rear ride height to start. Long term I will have to get shorter shock bodies ($330) or build new rear top hats like Jim Reyenga's or Nick's.

One more thing would be a large rear wing for higher speeds.

Any other ideas?

Originally Posted by PilotSH,Apr 16 2010, 12:32 AM

Like Steve said, SD surface is an odd surface where cars definitely get looser. When I lived there a couple years ago, I would go do events at the CalClub lot (great lot, similar grip to HPT IMO), SD Qualcomm lot, and El Toro. I was running my S2000 in the local street tire class, with OEM shocks and a big FSB, so the only thing that could be tuned were the tire pressures, and I kept those pretty constant. When I ran at CalClub, the car felt great. At El Toro, the high grip/abrasive surface made the car slightly understeery. But the biggest difference was going to SD. It was always significantly loose.

With that said, you might actually have to reconnect your rear sway bar for the Pro this weekend.

And like you said, also might be attributable to reduced bump travel. When lowered, I think that rear bump travel is an issue regardless of the shock, but exacerbated with the Penske shaft adapters. Couple that with some decent low speed rebound and possible packing down of the rear, and it doesn't surprise me that you could be on the bumpstops at the end of the SD courses, with all those transitions at the end.

James Yom

Originally Posted by josh7owens,Apr 17 2010, 08:15 AM

What tires should I run and why?

Re-11-
R-s3-
Star specs-
R1r-
ect-

I've read alot of people are on stars, r1r, and r-s3. Although I havent heard of many running the re-11s yet.

Originally Posted by josh7owens,Apr 17 2010, 05:15 AM

well the 949's will be in soon enough and its about that time to order tires. What tires should I run and why?

Re-11-
R-s3-
Star specs-
R1r-
ect-

I've read alot of people are on stars, r1r, and r-s3. Although I havent heard of many running the re-11s yet.

Thanks for the help...