205 top speed

[James Taylor]

Just brought a 205 turbo for the track and am curious what the top speed would be.
Believe it has a 1.6 gearbox.
I assume it will be the gearbox that will limit its speed.

Also what would be the ideal gearbox for trackdays?
Are there any gearboxes that have a lsd that will go straight on?

[Simes205]

James Taylor said:

Just brought a 205 turbo for the track and am curious what the top speed would be.
Believe it has a 1.6 gearbox.
I assume it will be the gearbox that will limit its speed.

Also what would be the ideal gearbox for trackdays?
Are there any gearboxes that have a lsd that will go straight on?

Roughly 120 with that box.
Depends but a 1.6 box would be ok for track, there aren't many straights you'll be bouncing of the limiter in 5th.
LSD was never standard - you'd have to fit a Quaife or similar

[James Taylor]

Do you know what gearbox would be needed for higher top speed?

Would like 135-140mph........only been bedford before in an Exige and that had 135 at the end of the straight.

Dont want to max out on the straight at 120.

[DiscoStu]

I had a 1.9 box on my turbo conversion, that would take it to around 140mph (indicated speed of course) on 5th limiter. I then changed to a turbo diesel box which took the needle off the clocks!!

Also worth mentioning is that the diesel box should be a bit stronger as its designed to handle more torque loads. As for a diff you'll have to buy a Quaife or similar.

[James Taylor]

DiscoStu - Is that a diesel turbo box from a 205 and is that what you would recomend for the track?

Do you also know what the redline would be on a turbo engine or is it engine specific?

[DiscoStu]

No it was a turbo deisel box from a 306, just swapped over the pull type clutch mechanism. For the track i'd probably stick with a 1.9 box as it will get you up through the gears quicker. And from memory I think the turbo engine redlines at around 6,500rpm

[TEKNOPUG]

On my TT I used a 1.9 box with a final drive from a TD. Kept the spacings between the gears the same but dragged then all out by 10%. So 1000rpm in 5th went from 20mph to 22mph (88mph @ 4k instead of 80mph). Made a big difference to driveability. 140+mph top. Also had a Quaife diff fitted.

[James Taylor]

Do you know where you would purchase a final drive from a td.

And if i gave a mechanic a 1.9 box is this 10% dragged out possible to be done by him or is that a specialist thing.

[DiscoStu]

The final drive of a gearbox is determined by the number of teeth on the crownwheel (fitted to the differential) and pinion. By changing these it is possible to alter the gearing, so by fitting a td final drive it effectively drags the gears out by about 10%.

Best way to do this is to get a td box, give it and your 1.9 box to a decent mechanic and ask him to swap the crownwheel and pinion for you.

[James Taylor]

If i have a 1.6 box and the moment does that mean i have to buy a 1.9 and td box....or can i just purchase the final drive off a td and a 1.9 box

Thanks for the advice everyone

[DiscoStu]

It'll probably be easier for you to buy complete 1.9 and td boxes. Unless you can find someone who is splitting a gearbox for parts as new items would be quite expensive i'd imagine. Dont forget you'll get decent money for your 1.6 box as they are popular with people who have mi16 and gti6 conversions

[TEKNOPUG]

Somewhere I have a spreadsheet with every single BE3 compatible gear and FD ratio, with a calculator giving speed per 1k RPM and top speed (so that you can play about with all the many variations). I'll have a look and see if I can find it for you.

[BazT]

A 1.6 box will happily do 130+ with the poke behind it and enough revs. I have a std 1.6 that does it frequently.

Gearbox ratios;

http://www.mckeown-enterprises.co.uk/downloads/205...