New shocks are awesome Options

[Joe Ricard]

Koni race 8610-1473 inserts in front
AFCO threaded aluminum Body Coilover 1473 out back.

Did a test and tune on crapped out Cantilevered slicks that no longer had any depth gauge holes.

We ran the car for nearly 4 straight hours. only shutting off to make an adjustment.
We learned that with the agressive rebound of the front shocks that the car would be held down on the front by nearly and inch after a run. I dropped the rear by that much. Gained a skid pad increase from 1.12 up to 1.21 sustained with consideraby more speed. Tweeked tire pressure and front rebound increase and went up to 1.27 with peaks of 1.31. We then started to tune throttle lift oversteer. Snapping the throttle closed and yanking the wheel and stabbing the gas just to see how we could get the car to hang out and rotate with power on.

We had to quit because it was making us sick.

Later in the day we set up a full autocross course and tuned some more with ride hieght down an 1/8" and made like 15 runns before we started to not be able top go any faster and could no longer put power down.

We thought at 1st we made some wrong adjustment. I waked to the back of the car looked at the tires and said Hey suspension is good. WE GOT STRINGS nearly 1/3 the way across the inside edge of the tire.
Put it on the trailer and called it a day. total success and we couldn't believe the tires lasted as long as they did.

[groot]

Great work, Joe!

I'm a bit surprised about your deltas, though. We do a lot of testing here and damping has only a very small effect on constant radius (skidpad) numbers. Tires, springs and bars are your hammers there.

Also, those tires must be pretty old (obvious since you corded them) because your absolute G numbers are a bit low.

[Joe Ricard]

Great work, Joe!

I'm a bit surprised about your deltas, though. We do a lot of testing here and damping has only a very small effect on constant radius (skidpad) numbers. Tires, springs and bars are your hammers there.

Also, those tires must be pretty old (obvious since you corded them) because your absolute G numbers are a bit low.

Yea, more of the story was we were starting with our old base line set ups before shocks. so the improvements were just getting the car balanced.
after we got the best we could out of constant state skid pad. then we started working on throttle lift oversteer and getting the rear end to be more predictable.

Yes I would say the tires were pretty hammered. being R600 cantilevered Goodyears I picked up used here (I think he said 3 or 4 heat cycles). I put 60 laps on them at NPR then subjected them to 4 driver back to back runs at an autocross totalling 65 runs. and then another event that we hammered on them pretty hard 15 runs. then this all day test and tune. When we started the day we had no visible depth holes.