What final drive should I go for?
Turbo Mini Forums

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

3.76:1 is such fun

I would never consdder going lower than 3.44 even on an all out high powered turbo motor

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

3.76 makes fourth more useble, rather than third.

How fast do you want to go, mine does 103mph at 6800rpm

id be more than delighted to hit that uphill in a 998 :)

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Is that in 3rd sprocket?

Back once again like a renegade master

Edited by T3Tone on 13th Oct, 2007.

-MINI CLUBMAN 1380 TURBO-

Remember to take into account where your peak power is and what your max revs will be, the DON has a 3.9 diff, but max revs is 9200rpm, so top speed is theoretically around 135mph, usual trap speeds are between 105 and 115 mph though on the 1/4 mile, depending on gas or not.

So havent you tried a top speed run yet?

Back once again like a renegade master

What's the point.......???

There isnt really a point suppose. :(

Well what revs are you at when crossing the line?

Back once again like a renegade master

Roughly 8k rpm on the fastest run I've done (117mph trap speed)

That car is a monster

Back once again like a renegade master

Ha ha ha
Everyones a comedian.
You knew what i meant.

Back once again like a renegade master

Back once again like a renegade master

i've got a 3.9 and with my engine its way way way to low. i'm hitting the rev limiter far too quick and not making any use of the torque i have in the 4-7k region. it maxes out at about 97mph with just over 7k on it.

mines getting a 3.1 in it over winter.

Surely you hit higher speeds quicker your times will be less with a lower terminal speed?

Id be inclined to say that if you hit the limiter before the line, i would agree the FD is too short. I would be aiming to cross the line with the engine just reaching the limiter, or if you have done the sums, cross the line with the engine at peak power

i've found this website good for calculating my final drive. i've used it to find out what my actual speed is as i've found my speedo under-read.....

http://www.guess-works.com/Gearbox/index_R.html

yup, was on the limiter before the line sprocket.

plus mine makes a lot of power lower down so it would be better to have the limiter lower and change sooner.

its a case of matching it for the engine, unfortunately i just left the FD in the box that it was built with as i was short of time and it is/was too short.

Still, better to play and find out.

Plus i'm sure it will be fine for my NA 16valver that i'll rev the knackers off.

I have just put a 3.1 in mine with clubman gearset, Been to pod and managed 93mph terminal in the top of third! Pulls like a train at only 10psi!