Transmissions, Porsche Transmissions Options

[Randal]

I keep hearing about all the different transmission formats that can be put into a 914 (4 or 6).

One of the guys at Sundays event is building a 914 with a 993 engine with the transmission turned upside down. Now how can that work, i.e., shift patters, etc.

So what are all these different transmission numbers (914/915/?)and what are the differences?

And why are 915 transmissions so expensive?

[ArtechnikA]

....my 901 is an open diff. Would I can a bunch of time on the auto-x/TT circuit by going to a limited slip?

i'm not B, but :-) ...

are you spinning the inside rear wheel ?
LSD lets you apply traction where an open diff will spin a wheel.
it can help a lot if you want (for whatever reason) to run a rerar antiroll bar - which will tend to raise the inside wheel.

it's very useful for big-track events with elevation changes -- AX is typically flat.
it's nice in limited-traction events if you race in the rain. or drive in the snow.

you also get to decide between a Torsen 'torque biasing' type (Quaiffe, Guard) or a ZF-style clutch-pack locker. each has its advantages and i won't pretend to be able to quote them all. either way you go Paul Guard is the go-to guy, i think.