998cc standard box?
Turbo Mini Forums

Ive decided to make that 998cc in my bedroom a turbo.

Cause im going more for reliable power im thinking stick with the standard box, ill probably only be talking 60-70hp is this wise people, wil h?

Cheers, Stevo

Well my NA 998 runs a standard box and that hs 60ish bananas.

The metro turbo was a standard box and they were fine upto 90bhp.

1275 and 998 boxes are identical by the way.

wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Nice1 cheers wil.

Cheers, Stevo

All 4sync gearboxes could be treated the same. If it's from a Mini 998, Metro or turbo doesn't matter at all really.
There are some small differences, and most people think that the A+ ones are better. I think not. Worse material quality and worse gear ratios. Quieter they are though.

my turbo engine is hooked up to a 998 box as the turbo box was shafted ....
It runs fine ; I think the diff ratio is different and would liked to have known what diff I have but I dont !!

Its all so confusing ; does anyone know what the standard diff ratio is on a normal 998 box ?

S

TurboLessTosser

Standard diff ratio on a 998 box?!

Take your pick......seriously, it could be either 3.76:1, 3.444:1, 3.105:1, or 2.95:1, depending on what year/model of Mini it came from...........

My mini City E was a 3.1?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

I have no idea what it was from :) next time I put them together mebe I will check :)



I have my Original Pickup engine and Box in the garage ... wonder what diff ratio that would have ..................... could use it as a screamer ???

TurboLessTosser

Early van and pickups were a 3.76:1 diff ratio from memory (to give lower gearing for carrying weight)

Mine was a bit later 1986, deffo 3.1 when i took it out. My 1989 Mayfair is also 3.1.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

The 998's changed to taller gearing in approx 1982, with the introduction of the A+ engine. The 10" wheeled cars (1982-84) used the 2.95:1 ratio, the 12" wheeled cars (1984-) used 3.105:1. This was obviously done to compensate for the slightly higher rolling radius of the 12" wheels. The carb and possibly SPi Coopers also used this 3.105:1 ratio as well I believe, although I am not 100% sure on what the SPi's ran. The MPi's as is commonly known had the 2.76:1 ratio.

Edited by Tom Fenton on 28th Jun, 2005.

3.76:1 - SO that would make a nice screamer then ???
What is a standard turbo diff ratio then ?

All these ratio questions .... its great !!!

S

TurboLessTosser

3.76:1 on 10" wheels means a top speed of about 85mph, but get there pretty damn quickly!

Standard turbo ratio is an odd ball only used in the Metro turbos, 3.2:1.

SPis are all 3,21

Are they? Learnt something new.......I thought they were 3.105:1