What RPM is required to do 100mph in 3rd gear in a cossie ? (205/40/17s)

Steve.

 

can i ask why

 

All depends on the diff ratio and gear ratio in the box Steve

But I would hazard a guess on approx 7200 to 7500 on a 2wd Cossie with standard diff and box ratios

 

Fookin hell theres no way i would b holdin my saph in 3rd gear that long 2 achive 100mph in 3rd, just change in 2 4th n achive it easly

 

here you go steve, you can work it all out for yourself

http://www.f-body.org/gears/

the kit i'm building can almost hit 100 in 2nd, it does 92 @ 6000

 

And potentially lose if racing or being timed to 100 for whatever reason.

 

Yer good point!!!!!!!!!!!!!! But as i said theres no way i would do it, how many cozzys would u let rev that far

 

2wd with standard diff and those tyres requires 7000rpm to see 100mph.

 

To 7000? All of them.

 

I had my rev limit set at 7200 - and that was on a nearly standard engine too

 

Surly the power start droppin off though b4 u get close 2 the limiter, i cant c the point of holdin the car i n each gear that long, surly u wanna b changin around the 6500 mark on a standard lump?

 

Don't think so, as the standard rev limit is 6800, which is why you see so many Cossies hit 157mph - as this is flat out with 17" wheels on the limiter .

 

Well I never Ive never driven a Cossie with a stock rev limit so thats new to me

 

This is why Dumped was so pissed when he went all the way to Brunters with his 400bhp car PLUS silly amounts of Nitros, but could only hit 157mph like all the other stage III cars there that day .

 

Thats what i was after, a 0-100 time.

Just wondered if its faster to change up to 4th or rev it out in 3rd

Thanks for the answers, now answer the above question please

Steve.

 

My lump ain't standard

Steve.

 

Hold the gear.

Same as with a 0-60.

 

Just trying to work out my 0-100mph time

I know the car does 0-90mph in 8.6sec (Santa Pod 1/8th time)

Was hoping its good for a 10sec 0-100mph time.

The car has 371bhp and 351lb/ft

Steve.

 

Some time back a rwd Saff with 400/400 was timed 0-100 in 10.2secs in a mag shoot.

 

you should can work out the torque generated at the output of the gearbox in each gear right through the rev range. you need a print out of the engines torque curve.

please correct me if I'm wrong but its normally an advantage to hold each gear as long as possible. (N.A. cars)
so change gear when the output torque in the next gear is greater than the output torque in the current gear.

example.
in 1st you might have output torque at 3000 rpm of 1500Nm.
in 5th at the same rpm maybe 500Nm.

I hope that sounds ok.

 

i have a stage 3 with normal gears and dif, i was pulling 100 coming on to the Dunlop staraight at Donnington on sunday, in 3rd reving (acording to standard rev counter and spedo) right on to the 7k.