OK, all you 3.6 guys. Why not a G50 too

[jmz]

I am sure some have thought about it. What made you choose the modified 915 as opposed to converting to a G50. The 87-89 cars had them so it can't be too out there.

Lately, I've been dreaming of a reliable, torquey fuel injected clean engine as opposed to my cammy, fuel spitting carbureted engine.

regards

[surflvr911sc]

Why not?

Cost, required modifications, weight, and the 915 is a nice little transmission when properly sorted.

[moazam]

Originally posted by surflvr911sc
Why not?

Cost, required modifications, weight, and the 915 is a nice little transmission when properly sorted.

Hmm, couldn't the same exact thing be said for the 3.2 vs. the the 3.6 ugrade?

[surflvr911sc]

Nice one.

Although I gained 100hp and lost 100lbs w/ my 3.6 conversion. That made the extra cost very worth it to me. Modifications aren't much more.

[Mike Feinstein]

I guess it depends on what you start with. I have to say that the two work so well together, you'd think Porsche designed it that way....come to think of it, they did!

How'd you "lose" 100 lbs with the swap? The 3.6 weighs about 10 lbs less than the 3.2.

[ischmitz]

It 's mostly that you have to shorten the bell housing ($$) or modify the the rear torsion bar tube ($$$$). Too painful for an earlier car IMHO

Ingo

[surflvr911sc]

Don't get me wrong. I didn't say G50 guys should backdate to the 915, I just don't think it's worth doing to a 915 car, the 3.6 works very well w/ it too, almost like they designed it that way.

[89911]

Why not buy a 964. 3.6. G-50. And most likely less then an 87-89 3.2!

[mjshira]

is it just me or have we beat this horse to death? Jack posted sometime back about how a tranny cooler and having one built correctly could make a 915 more than able to handle a 3.6...

[POVI]

Hi ,

Im running a 1986 ROW 915 box , with integrated oil pump and cooler and limited slip .. works great with my 3.6 .. and I dont puppy it either

No need for a G-50 ! .. just get a late model 915 trans

- Joe -

[Bill Verburg]

I used a mg case 915/49 hard for over 100k mi in front of my original C3 engine, then backing up my 964 for many more years/miles w/o any issue. It was still going strong when I swapped in the 916/67 as a prelude to another swap to an even bigger more potent engine. I don't think that the jury is in just yet but I am fairly confident that it will be fine.

A cooler is important for track use, but not in normal street use.

[Jack Olsen]

Originally posted by jmz
I am sure some have thought about it. What made you choose the modified 915 as opposed to converting to a G50.

1) It's heavier.
2) The gearing is taller, and replacement gear sets are expensive.
3) It requires moving the engine further back, which hurts weight distribution.
4) It's very expensive to adapt a G50 to a pre-87 tub.
5) More race-related mods and gearsets available for the 915.

That said, the G50 has many virtues.

[Craig 930 RS]

Ah, damning with faint praise.........!
Agreed.

Craig
ERS

[jmz]

Thanks all. It sounds like the path of least resistance is to build a nice little 915 gear box.

Jack, Do you know how much heavier the G50 is than the 915?

also, if one should use the G50-50, would you still have to move the engine further back?

[RickM]

There would be a heck of alot more G50 conversions if it were easier. It would probably be real high on the "upgrade" list around here.

[jpachard]

The G50 is only 20lbs heavier, if that. I just picked two up and they are very similar in weight. As far as gearsets go, there are TONS out there. I have my sheet from Paul Guard and I would say there must be 10-15 combinations for each gear. These transmissions are run in the GT-3(R-RS-RSR, actually the RSR now has a Hollinger 6 speed sequential) so they are pretty bulletproof. The gear sets are pricey but remember you are getting the same gears that are used in ALMS etc. thus the price. The G50 is just a great tranny but the mods. to put one in an earlier car do add up. If it's going to be a race car it's a no brainer. Missing a shift is very expen$ive.

Cheers, James

[jmz]

James, you wrote; "it's a no brainer. Missing a shift is very expen$ive."

That could be taken two ways, one is that missing a shift in a G50 will break the bank. The other is that it is so much easier to miss a shift in a 915 that a G50 is the way to go.

[jpachard]

Whoops, Missing a shift with a G50 is pretty hard, though not impossible. I have seen several missed shifts with 915 amounting to many bent valves etc. I think that once you get a 915 sorted for racing you have to put alot of money into it(Wevo shifter, coupling and rienforcment plates etc.) it would be interesting to see a cost analysis of getting a 915 race ready vs. doing the G50 install.

Cheers, James

[SprintStar]

Originally posted by Mike Feinstein
The 3.6 weighs about 10 lbs less than the 3.2.

I'm surprised. What makes a 3.6 weigh less than a 3.2? From what I see, a 3.6 has more things, like power steering pump, bigger fresh air blower, extra fan belt and pulley, dual dizzy, etc...

Sprint.

[SprintStar]

Originally posted by Bill Verburg
I used a mg case 915/49 hard for over 100k mi in front of my original C3 engine,

What's a C3 engine?

Sprint.