I've taken it to 130mph and it did feel a bit unstable. The car is just too light. I passed a semi at 125 and all that wind coming off of the semi hit me as I got in front and it literally pushed my car sideways a bit and I fish tailed (minor) and almost lost control.

I don't drive crazy like that anymore. I'm glad I didn't have to learn the hard way not to drive too fast. But I will say 100-115, it feels pretty solid.

 

18s and wide tires. Rock steady.

 

It's not that the car is light that is causing the instability -- it's because the car is an aerodynamic piece of turd.

If your tires are good, your alignment straight (add some toe-in for highspeed stablity) and you have those strakes in front of the wheels, the next best thing to do is to add a wing.

The car has a short wheelbase, which leads to quick transitions in slow-speed corners. It is part of why the S2k handles as well as it does. But at high-speeds, that short wheelbase generates lift. That is where the instability comes from. Add the fact that it's an aerodynamic brick, with no undertray aero management at all (other then the strakes), it is why racers have such a huge success from adding a wing.

Being light has very little to do with how stable/unstable the car is. Add 1000lbs to the S2k, and you'll encounter the same problems at those speeds.

 

Has anyone made the underbody more aero dynamic or done any testing with this?

 

BUMP.... i justfound this ... short wheelbase cars that handles great

Audi A3
206 GTi
Ford Focus (bit long...)
Ford Fiesta (latest)
susuki swift
renault clio
seat leon cupra
civic type r
integra type r
miata
lotus elise

 

You want stability, get the CR, it was engineered to run very well all the way to the limit.

 

I have gotten my car up to 150+ mph when i was young and didn't know better. I usually took it to at least 110 mph daily and up to about 125 mph. At those speeds, it felt solid. but any thing pass that and man it get freaky!! at 150+ mph that is where i saw euphoria and when i braked, that's where i saw hell!!!

Just keep it under 125 mph and i say that your safe. But it is not something you should try in traffic. If you are a kid and think you are invincible, please at least try to get use to it on an empty road before you do it in traffic. Better yet DON'T DO IT!!!

 

i feel find going 120+ its the braking part that scares me. When you brake harder then usual going at high speeds, the back gets kinda wiggly and maybe a rear diffuser would help that. But of course the car will be unstable at high speeds with top down.... its like driving an SUV with all the windows down driving by semi trucks.

 

lol my first car was a mazda tribute. that thing would only go to about 110 and talk about unstable!

 

I always felt my car had more stability at 80 - 120 mph.