2.95 final drive
Turbo Mini Forums

hi

i have in my shed a 3.1 fd but im thinking of using a 2.95 final drive.
do you think it will still accelerate well with a 2.95 or will it be a bit to tall a fd?
or should i just use the 3.1 i have in my old 998 box?
what standerd minis or metros can i get a 2.95 crown wheel and pinion out of? (what number of teeth should be on each one?)
o and just so you know its for a road going turbo mini and i paln on using cr/sc gearbox.


your thoughts people please

cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

i use a 3.2 diff with a c/r s/c box and 10" wheels. 1st is a little long when at tickover in traffic and when lifting the clutch in 1st. also 4th is a little short for road use as you can easily run out of revs.

it will all depend on the power of your car, size of wheels, amount of motorway use, your preffered cruising speed and revs etc, but the final drive is always a problem.

In the end the difference between a 3.1 and a 2.9 is small so i would use the one you have. you will be limited to cruising at about 80mph ish and max speed aroung 130mph. you should also be able to do 40+ in first.

yup i'd agree with that. i'm running a 3.1 on 10" wheels with a clubman gearset.

the long 1st does make driving a lot nicer, but hill starts can be a bit harsh. I've also found myself hitting the limiter in 4th a few times aswell.

"the long 1st does make driving a lot nicer, but hill starts can be a bit harsh. I've also found myself hitting the limiter in 4th a few times aswell. "

just not on the public roads officer!!!!

of course not...never been over 70 on the queens highway officer

Whats a 'Queens Highway Officer'

Ive heard of Highways Agency Officers but never one of those

well using the gear calculator iv got:
3.1=113.6mph at 6200rpm
2.95=119.3mph at 6200rpm
on 10" wheels
would it be safer to rev it more than that or is that a bit too much?

cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

my limiter is set at 6100, but thats purely because i've got a totally stock bottom end.

I have no idea what a stock bottom end can really cope with for long periods of time, but all NA MG enignes should happily rev to 6,500 in std form. Not sure how the larger/heavier turbo valves would handle this though, for valve bounce.


If it blows up dont blame me though! I did used to rev mine, mg engine with a 276, to 6,750 all the time though with a stock bottom.

Edited by andeh on 29th Jun, 2006.

I've seen the future and tbh its Pie

iwould rather have it so its a bit under reved than over reved if you know what i mean!
how does yours accelerate and cruse happily with the 3.1fd bud?

cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

mine accelerates fine and i sit at aroud 3500rpm on the motorway with no problems.

It's made the car a lot nicer since i changed to a 3.1, the 3.44 used to really do me tits in on the motorway.

i run a 2.9 in mine, i like the diff, but yes first gear is a little to long for easy fast get aways, but it's nice for motorway work.

Edited by Miniwilliams on 30th Jun, 2006.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

i think ill just use the 3.1 then as i dont really use motoways alot (only to the shows in the summer if i have to!) and i can live with sitting at 70mph so that shouldnt be a proplem. im after somthing that will be good at the lights and suprise the odd chav etc but not to bad at crusing etc.
as i have one i may as well use it realy!
just out of interest what minis have the 2.95 fd as standerd?
cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

i know the city E's had em, cant remember what else though.

not much i dont think, its certainly the only source i know of. I've been looking for a 2.95:1 for a long time now (not running a s/c c/r set in mine first time round.

Edited by andeh on 30th Jun, 2006.

I've seen the future and tbh its Pie

i think it was only the city E that had the 2.9 diff. but as shown above the 3.1 is so close.

as for revs you all seem to take it easy. standard mg metro engines rev to 7500 with no problems (way off the metro rev counter). max power on the turbo is normaly around 6000 so i set the limiter at 7000 and aim to change at 6500ish

wether your engine can take this is another question. if its standard with standard boost i would rev away. if standard but with 20psi of boost i would be very very careful!

and yes i can easily hit the limiter at 7000 revs.... hhmmmm.... how fast was that then?

i have to take mine easy, its my daily driver!

Would you guys say a 2.95 with SC is too much for a daily driver who does motorway trips, trying to work out if i should use my 2.95 diff on my turbo build or go for a shorter one.

Manchester Minis

2.9 and 10" wheels is nice on the motorway but..

1st gear is the problem. when in slow traffic at tickover you end up catching up with the car in front and dipping the clutch all the time. also when pulling away you need to slip the clutch a lot to get going. as such the clutch does not last long.

option 2 is to fit say a 3.4 and when going on motorways fit 12" wheels with high profile tyres, but again you have the same problems if the traffic is slow

i run a 2.95 with 13 on 50 tyres with a challenge gearset

and i love it

the torque of the turbo just pulls it and you are not going up and down the box like a fiddlers elbow!

mind you thats my prefrence

it does sort the chavs out as well.....lol

mine will be a daily driver just to let you know!
not sure what clutch to use (ill use a pre verto type i reckon!)

josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

daily drive then depends on what you want

a good all rounder 3.2 FD with the standard turbo metro ratios

thats just my thinking though

what about 2.76 CWP on a turbo ??

1293 Turbo mini

it'd be fine if you used a std a+ box (not economy ratios), but you'd never get it to pull away or hill start with a s/c c/r box

I've seen the future and tbh its Pie

what if you are on 10s

1293 Turbo mini