Well that contradicts what I have seen for what ever reason, maybe time to get the car back on the rack and watch what the numbers do again as I load the car. Toe in under compression is also counter intuitive to how the car reacts in the real world and set up from factory.

 

My first track experience with the AP1, I found that it had a kind of initial oversteer LURCH at turn-in while on the brakes (rears in rebound from braking, both toed relatively OUT), but as braking decreased and the car heeled over with cornering g's, the outside rear would toe inward and "catch" the oversteer. Very weird behavior... Took a bit to get used to. But consistent with "toe-in with bump".

This behavior is also why so many uninitiated drivers spin AP1s. On the gas in a corner, if the back end starts to step out and you LIFT, the outside rear toes relatively OUTward (loses toe-in) as the back end rises. Double-dose of oversteer, from unloading the rears and the outside rear toe changing in the more oversteery direction.

Toe-in with bump gimmick has been repeatedly tried, particularly by the Japanese: 2nd-gen RX-7, first version of 2nd-gen MR-2, 1st iteration of NSX, and then the AP1. Perversely, the idea has been to give more understeer while cornering, but the result has always been weird nonlinear handling and SEVERE punishment of newb mistakes (I.e., LIFTING off the gas)!

 

You should be able to get decently balanced handling without "fixing" the bumpsteer (toe-change-with-bump) problem, but many use BSKs (bumpsteer kits) to minimize/eliminate the issue.

If you had a balanced setup and took out the TON of rear toe-in prescribed by the UK spec, that will give more oversteer. Which is why I suggested a stiffer front bar (with which, more front camber would probably be warranted).

Or you could just try disconnecting one of the rear sway bar links next time you're at the track and see what that does.
That's what I did when I got rid of the built-in excessive rear toe on my 240Z. Then I just removed the rear bar. Even with the loss of roll stiffness on a street/track compromise setup, I went ~1second faster at NHMS South Oval vs. the previous setup

 

Quote:

ZDan, could you give us a good description of your setup? Like ride height, springs, sway bars, shocks, shock settings and of course alignment settings to help us rear toe users figure out what we're doing wrong?

Quote:

stock '01, stock '01, stock '01, stock '01, stock '01, -1.3 front camber, zero front toe, ~5.5-6 front caster, -2.2 rear camber, 0.2deg total rear toe (~.085in. total).

I had no idea your S2000 was so stock. We drive very, very different cars. My S2000 race car runs about 7 seconds a lap quicker than the fastest stock S2000 at Summit Point. My engine is stock so the speed differential is suspension, tires and a little aero.

 

S2000 has always been my dd, never been my *track* car.

 

toe-preferences aside I realy feel if the car gets in the corner good and has good corner speed and balance its normal.
I've just never known my car not to be loose on exit especially in 2nd 3rd but then I could be doing it wrong.
I think if you go changing the swaybars or put tons of toe-in on the rear you might create more understeer and screw the car up mid corner.

try to drop the rear shocks down and see if that helps but things to check out:

Rear swaybar binding? check bushings
Something loose at rear of car? toe/control arms, subframe etc
Tires? the only time I ever felt I had borderline undriveable car out of corner my rear tires were cording

 

Just to add, I really doubt toe in is the issue. I was running 1/16th total toe in at the rears and the car was loose but controllable. Went to 1/8th total and it was better.

When I had 1/4th toe total it got very unpredictable at the limit and was extremely worrying to drive in the wet. Hope the issue is just toe for the OP

 

That was precisely my experience with too much rear toe in the pouring rain at Mt Tremblant. Down the straights, car was all over the place. But then at turn-in, it plowed like mad!

 

I had more than 1/4 toe in at rear at one point as I was just testing out settings. In the pouring Rain at about 60mph, a tiny steering movement became a entire change of lane. I was so disturbed I went immediately to reverse the toe in change.

 

My car is very stable and quick in the rain with full tread R-888 tires and 0.25 inch total toe-in.