I had the opportunity to have Randy Pobst drive my car yesterday at Pitt Race. He liked it and it was neat to see areas he drove differently. He felt like he got all out of it and was able to run a similar time to my PR, actually was on a lap that would have been faster but we caught traffic. His only complaint was a trail brake induced oversteer that actually about put us off in 3. I definitely know what he means, there are times when this car just nails it, but once it goes it goes. He drove another similarly prepped S2k and said it felt more stable, except based on data it was about 1sec slower. In fairness I think it was all in the weight difference and tune as my car is probably 100-150lbs less and I have lower Vtec. I followed and was definitely a touch faster on the straights.

My car is 225/255 staggered, stock sway bars (01), Öhlins DFV 10K/10k, -2.6/-2.6 camber, .20 rear toe. The other S2k was 265/265, HKS shocks 16k springs, I think OEM sways, not sure the alignment. Both cars have similar aero with the other car having a wide body kit. We both have aftermarket brakes I have AP SBG fronts and urge rear, he has the full SBG front rear (Wilwood front). So maybe it is a brake bias issue although I think the car felt that way before I installed the BBK.

We tried adjusting my shocks, he wanted to increase the front, except I was maxed, so we decreased the rear, which just made the rear feel slower, but the issue was still there. It was crazy to see him replicate it with so much confidence, I could not do what he could and know that I wasn’t going to spin, especially it a car that wasn’t mine.

So I am trying to figure out where to go next, I personally like the 225/255 and don’t drive competitive so I don’t necessarily want to go square. Plus I don’t think that will help, in fact in may make it worse. I am sorta thinking different shocks and stiffer springs as I am maxed on my current setup. Plus, I drove a students S2k with stiffer shocks/springs and it did feel better.

For reference my PR is 2:00, which isn’t a bad time for a stock power S2k on that track, so the car is doing something right. I only want to change ONE thing at a time and am just trying to figure out where to start. If I went with stiffer springs/shocks I would bump the camber a touch as I think that would be needed.

You Tube

You see it here on entry at around 1:35. Most of the time I can catch it like it this video, but it happens too often. I am thinking it is lack of rear travel with the DFVs and softer springs.

Also an AP1, but stiffer springs. The reason I am leaning towards shock travel is it got more dramatic/sudden with aero. I need to stiffen springs, but my goal is to only add as much spring as necessary.

no BSK on either car, just the differences noted above. I could see what his rear toe is, maybe it is more than mine.