I have been looking for a while on any hard data what top speed an unlimited nongoverned str would travel at. We know its limited but what if it wasn't. Cant find any facts on it. Anyone know? Anyone guess.


MY GUESS: Considering at 165isMPH the rpms still have a way to go, with an infinite road I would guess 190mph.

 

Remember that air resistance rises very rapidly with speed. I doubt it's 190 top without more power. A fair estimate would be the top speeds of other 400HP 2 ton cars.

 

It's frontal area and drag coefficient that become the issue not weight but you are on the right track here.

 

An ungoverned STR will likely do 180 mph.

 

The reason I mentioned weight is that a much lighter car will almost inevitably be smaller and have less drag etc. I believe it's possible to look up many cars' top speeds and if doing that I wanted the OP (or anyone else) to look up only cars of similar weight so as to get a sensible result.

 

My guess is 175 to 180 mph. This is assuming some level of aero factors. To the best of my knowledge, just looking at an STR redline, you're looking at about 190 mph.

 

I'd say 175mph based on a 05/06 GTO which has similar weight and power. don't try it though, because you'll need 500ft or so to stop to zero.

 

Is that with or without new coil packs?

 

I kind of doubt that but if it does god help you if you haven't upgraded your tires ...

My guess is a bit over 170, 173 or 174. The increase HP required once you get up this high is down right staggering. The S-Type is not a low slung Lamborghini.

I have a 3,100 lb late 70's Maserati with a cd of .21 and 330hp which was super car stuff back then. It will do 160 after about 10 minutes flat out but no more.