I ordered a set of JIC coilovers, so I have been reading through all the applicable threads on the subject. Some people have lowered the front more than the rear to increase rake, while others have lowered the rear more than the front to decrease rake. I don't really know what impact this would have on oversteer / understeer, but it seems like it would effect high speed stability by changing the air flow over / under the car. Is this an issue?

 

Theoretically, reducing the rake would cause a problem, but I have no S2000 specific info. On the C5 corvette, people who know have told me reducing the rake is a real problem.

I don't know why you went to the coilovers, but if you did it for performance, I'm sure you realize you should set your ride heights as low as you can w/o compromising the suspension geometry, while avoiding tire rub, and also, and this is the part it doesn't sound like you're considering, to optimize your corner weights. Of course, you need to do all of this and try to keep the rake in mind. The combination of all those will leaves you with a very small "good" ride-height range to play with.

 

To decrease oversteer set the rears lower than the fronts. To increase oversteer set the rears higher than the fronts. On my Mugen N-Zero's I have a 1/8" rake to the rear & I'm very happy w/ the performance, handling, & looks so far.
Good Luck

 

High speed stability isn't an issue for me. Although if I spent most of my time driving the S2000 on the highway at speeds over 70mph I def. would not have gone w/ coilovers.