Porsche 930 vs UN1 upgradet box?

[Robin Rydning]

I have did a lot of reading about the 4 speed 930 box on this forum.
And it looks to be very strong.

Do any know the shaft dimension on the 930 box?
And how much torque it can take?

The 5 speed UN1 upgrade from:
http://www.gtoengineering.co.uk/gtor/page1.htm (think this is what you refer to as the Cris Cole kit)
Uprated Renault Gearbox (Derek Bell)
This 2 5 speed upgrades looks vey simular and also stong compare to the 930 box.
Only that the 5 th gear on the upgadet Un1 box looks weeker.
930 have 22mm wide gears, UN1 have 20mm 1/2nd, 22mm 3/4th

Any with more info why the 930 box is much stronger than the UN1 upgrades?

 

[Russ Noble]

Off the top of my head I think 235 v 190 cw&p, also maybe beefier input shaft. Look at the 930 Failure thread, maybe ZF Failure thread, I think there's that info in one of those.

Cheers

 

[kent holst]

dont under astimate the un 1 it is a good tranny ,set up right right oil system i think it would handle a bounch of hp . i have broke a couple but anyway if u look at the cost it is ok-