Just curious... have always wondered if there was some specific reason...

Thanks

 

Strength. The gears etc are larger and lets face it it's pretty cool doing 220kph in 3rd.

 

I had been told that 5-speeds were not strong enough to handle the HP & TQ- never believed that. If they did it for strength, then, why? I mean, they didn't have to have it...? There were cars that made more HP & TQ than 1988 911 Turbos w/5-speeds weren't there? Either way, the next year, 1989, the 911 Turbo got a 5-sp & then, several years later, a 6-sp & more HP/TQ. Did they just learn ways to make stronger, gears of smaller size so they could fit them in?

I do agree w/your statement though- given enough HP, 4th gear was capable of redlining ~180mph. Redlining 3rd would have to been >120mph- pretty cool.... :-)

 

I think redline in 3rd is more like 150.

 

The 4 speed 930 gearbox was built to homologate the 935s. A 935 with 750+ ft/lbs of torque needed something far stronger than the 915 trans, which can only handle like 350 max. The later 5 speed G50/50s are totally different than the 930 trans. They didn't just add a 5th gear to a 930 box, but completely redesigned it (even the synchros are a totally different design).

 

That's my understanding, too.

 

Hello,

isnt a standard G50 strong enough to handle the
standard 930 power?


Falk

 

Sure is, but they didn't have those until 1986 and they were too long to fit in as they were which is why the G50's are shortened to squeeze them in. The alternative is to cut the car to make room around the torsion bars which means you have to switch to coil overs.

Not too sure if the G50 would take 750tq racing on a track for 24hrs though.

 

Jim Patrick says the G50 is strong enough to support well over the 500lb/ft of torque, I wouldn't bet the farm on it so I went for the G50/50.

 

Schnele, how much did the G50/50 cost you? Jim Patrick would not return my emails or calls for some reason...
I was considering putting my G50/01 out of my 930 into my 3.2 carrera and putting a G50/50 in my 930.

TIA

 

The other part of the equation is that the more time you spend shifting, the more time you will consequently spend waiting for the turbo to spool up again. Basically if you can develop enough power to stretch your 4 gears from 0 to top speed, there isnt a huge benefit to designing a 5 speed unit.

 

how much do we have to cut? if we need to. to fit the G50/50? is it a big job? the parts we have to change?

 

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I would be more than happy to share the gory details of my transaction for my g50/50 with the board but it really isn't worth my time. I will say this though, he could take some lessons in customer "FRIENDLY" service. I dropped over 13k on my geabox and when it got to my engine builder the input shaft wasn't machined to spec, I called Jim and I took an amiable posture because I needed him to make it right, the arrogant bastard told me "I do not make mistakes." Long story short he did in fact make a mistake and took the transmission back only to hold my build up with further delays while trying to get a bastard part from on of his suppliers. I voiced my displeasure with the whole deal and he made things right in fairness to him, ok I AM RANTING NOW, no one should have to deal with that kind of garbage from a vendor. In the course of my build I have dealt with numerous knowledgeable people Stephen Kaspar, Todd Knighton, Chris Carroll, Marco Manzie, Steve Weiner, Geoffrey Ring to name a few, gentlemen all. It should be noted that while Marco, Weiner, Todd and Chris gave freely of their time I haven't bought anything from them although I felt very comfortable with them and I will keep them in my thoughts for future projects, the same can't be said for Jim Patrick. If Jim had some nuts he would give me a call and say look these things happen I am sorry about the "I DON"T MAKE MISTAKES" bit, he would regain my respect and we could move past it instead he had his office manager call me to inform me when the transmission shipped.
My Humble opinion I am not out to get anyone I have no agenda, I wish Jim the best and I hope I won't be needing his services again, that is I hope my transmission lives up to its billing. Oh and by the way Jim can nice, almost a pleasure to deal with but the ocassion was so fleeting I can't remember it.
Lincoln Peter Phillip (aka Schnele because Schnell was already taken)

Update: My engine builder states that the trans is a a nice piece, but it is something you only want to do if you don't plan on doing any other discretionary spending or you have gobs of money lying around. In my case it is the former, so no other new toys, watches etc this year, I did this build to see what a well developed 930 would be like, it has been fun but the driving season is over here in Michigan is over and I still don't have my car.
InC, no cutting is necessary with a shortened bell housing transmission.

 

The above post refers to my dealings with Jim, I can't speak for others

 

The G50/50 is a stronger transmission than the G50/01, 02, 03, 10 and has a larger ring and pinion to handle the power. The gearsets are the same between the transmissions, so it is only the mainshaft and the R&P that are stronger.

"Basically if you can develop enough power to stretch your 4 gears from 0 to top speed, there isnt a huge benefit to designing a 5 speed unit."

A 5spd is a huge improvement in the 930 regardless of engine trim. A 6spd is not necessary.