thats tight. be safe at that speed. you had the straight away and you took it, which is badass.

 

The speed calculators used above AFAIK assume no drag. Since we all know that even IF you put 2.xx gears in, there's no way we could do the 200+ mph speeds calculated. Unless we drive in space somehow...

If I can find the time, I'll cook up some fancy physics equation taking drag (which is non-linear actually) into account. Although for simplicity, I'll use a constant drag coefficient.

 

I am assuming it kept pulling in 5th upto 6k rpm cuz your speed limiter has been removed? 170+mph is sick. I'd be terrified I think haha.

 

 

Edited, 173 mph @ 6150 rpm

Same car without the supercharger is 150.


5th gear in the TR3650 is 0.675:1


Norm

 

+1 on the drag coefficient being non-linear. And some of our Stangs are more "slick" than others which will also skew results from 1 car to another.

The calculations seem to be very, very close from what I've seen up to the 125 or so MPH that I've been to. It would be interesting to see at what point the coefficient really kicks in.

 

What you are really noticing as you get up within 5 mph or so of the car's top speed is that since there isn't much acceleration occurring, every little increase in drag takes in increasingly larger bite out of it. You don't see the aero wall until you're already in it.

At 150 mph, the HP required to balance the aero drag force increases by about 2% per mph. I strongly doubt that Cd increases anywhere near that rapidly.


Norm

 

Thanks, Norm. You always help shed more light on these topics.

 

the Cd doesnt change. it is determined by the shape, frontal area, and smoothness of the surface of the car. The drag force does change based on speed.

 

In the case of the OP, the calcs would be correct. Drag will limit your ability to reach redline in top gear if you do not have enough HP to overcome the drag.

However in the OP he made it to redline, this means that he had enough HP to overcome the drag. So at redline, given the gears, he would have been going 174mph. Drag is not part of the equation here because mechanically, unless he was slipping, the car was turning the RPM's with the gears and tire size to be going 174mph.

Damn fast!