I get the 100Mph float to. The car feels stable up to about 100-105 then it feels "light" until I get into 110-115mph where it feels much more stable again. It seems like there is a 10 Mph window where it feels a bit loose.

 

Barry is completely right here. These are standard pieces of equipment that should be added to your car during prep. They look like mini mud flaps that go in front of your tires instead of behind them.

I've done 140 a few times and my car feels like it is suctioned to the cement. I've never felt any float.

 

I've had my s2k for only a week and two different experiences. At 93 on a smooth road it felt solid. At 80-85 on a less than perfect road with some breeze, it was twitchy and I backed off. Mudflap "thingys" in place, didn't even know they were there until reading this thread.

 

You know... the S2000 doesn't have traction control. Also, you may want to check out the S2000 Type V.

 

Tires deflect at high speeds causing slight variations in the contact area. Speed ratings are based, in part, on this. Tires with the same speed rating can have different delflections. This could be contributing, although not as much as irregular pavement.

Never exceed the speed rating of your tires.

Very dangerous.

 

Sounds like a wheel balance problem to me.

 

Can u guys post pictures of what the mudflaps look like? I don't know what they look like...i can't find them!!! thanks very much.

 

http://www.hondacars.com/models/exterior_g...ModelName=S2000

Go to the 360 degree view link and rotate it around, you can see the flaps in front of the wheels.

 

Yer i have removed those mudflaps...didnt think it would matter... might try put them back on and see if it feels different!
Oh and if u want more hi-speed stability:
GT Wing + Top Secret Rear Diffuser + Front Cannards

 

so the rear wheels have front flaps also...thanks!