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Quote:
Originally Posted by quattrorunner View Post
I suspect it's a crapshoot. Both mine broke second gears in similar ways, coming smoothly on boost. was running .8bar boost.
That being said I'm jealous of those who still have 915 ratios.......
Was your 2nd gear a strong Guard version? I fear of this day coming, when something breaks and the car is down for a period of time. But I also really don't want to convert to a heavier G50 and related hydraulic components.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-07-2018, 11:16 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)
Brando
 
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Quote:
Originally Posted by puddy View Post
Was your 2nd gear a strong Guard version? I fear of this day coming, when something breaks and the car is down for a period of time. But I also really don't want to convert to a heavier G50 and related hydraulic components.
No it wasn’t. I know that would give more strength but even he said the width doesn’t change. Only the “freshness” of the temper. His gears would certainly help but they’re not cheap. Againbit cane down to money for me. I figured that to make my 915 strong enough for comfort it would cost me about $10k. And then I still couldn’t trust the gears completely. So I bought a short 930 and threw it in. Now I just need more power.
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Old 06-07-2018, 11:26 AM
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912-6 Turbo
 
Join Date: Jun 2014
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Quote:
Originally Posted by quattrorunner View Post
I figured that to make my 915 strong enough for comfort it would cost me about $10k. And then I still couldn’t trust the gears completely.
What are your opinions on a 930 gearbox, but with shorter R&P ? Assuming you have the stock R&P now ?

I usually start off from a light in 2nd gear anyways as first gear is useless ... so i'm driving a 4 speed the majority of the time

Cheers,

Sandeep
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1966 912 Bastid - Carrera 3.2L - GT3076R - Bosch 044 - Intercooled - 55lb injectors - 0.5 Bar - Tial 48mm - Magnesium 915 7:31 - BBS E26 15x9, 15x10 - AEM Infinity 6
Old 06-07-2018, 12:50 PM
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Brando
 
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I love my 930! till I want to go faster than 130mph in mexico. I love having the tall gear but also hate that it's so tall and my only option. I'll be fine once I get a new clutch and raise my boost.
I think the shorter r/p is great for the track and canyons but I need to get there on the freeway....
Currently with .5bar boost I struggle going faster than 130-140mph. 1-3 gears is great. Again, my problem will largely be solved with 400hp+ that 1.2 bar boost will give me.
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Last edited by quattrorunner; 06-07-2018 at 01:02 PM..
Old 06-07-2018, 12:59 PM
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I would bet that by the time you rebuild and reinforce that 915 transmission (bearing plate, machining, side cover plate, etc) you'll be more than the cost of shortening and rebuilding the G50.
Especially if you start adding gears to the 915.

More power will probably require a stronger 915 clutch, the G50 needs a clutch... probably similar monies there.

The G50 uses an altogether different shifter, so you'll need a good used one from 1987-89 Carrera.
Same goes for the pedals.
Yes, they're getting hard to find and they are pricey, and that's before you add a $600 Wevo shift lever of $300 coupler.

The factory hydraulics are so reliable, I don't think there's any reason to entertain using any other clutch release setup.
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Old 06-07-2018, 01:17 PM
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912-6 Turbo
 
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Quote:
Originally Posted by TurboKraft View Post
I would bet that by the time you rebuild and reinforce that 915 transmission (bearing plate, machining, side cover plate, etc) you'll be more than the cost of shortening and rebuilding the G50.
Especially if you start adding gears to the 915.
That's what I was thinking ... only issue for me is I don't think there is anyone local to take this project on, so that means shipping the gearbox to the States. I have to put a pricetag on the shipping label for the courier and get charged the sales tax on my own gearbox

It all comes down to $$ at the end of the day and its looking like the best option may be to put the money into the G50.

Cheers,

Sandeep
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1966 912 Bastid - Carrera 3.2L - GT3076R - Bosch 044 - Intercooled - 55lb injectors - 0.5 Bar - Tial 48mm - Magnesium 915 7:31 - BBS E26 15x9, 15x10 - AEM Infinity 6
Old 06-07-2018, 02:44 PM
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Sandeep I know a local guy who may be able to help with shortening the trans. PM sent.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-08-2018, 03:51 AM
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Look at photos of ones that have been shortened, you'll see how much needs to be removed from the bell housing and the input shaft.
Don't forget to shift the profile inside the bell housing by the same amount so you have clutch clearance.
Re-heat treating the mainshaft is a good idea, too.

Hope your G50 is in better shape than the ones we've been seeing lately -- bad 4-way bearings, bad sliders... $$$$
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Old 06-08-2018, 09:34 AM
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912-6 Turbo
 
Join Date: Jun 2014
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Quote:
Originally Posted by TurboKraft View Post
Look at photos of ones that have been shortened, you'll see how much needs to be removed from the bell housing and the input shaft.
Don't forget to shift the profile inside the bell housing by the same amount so you have clutch clearance.
Re-heat treating the mainshaft is a good idea, too.

Hope your G50 is in better shape than the ones we've been seeing lately -- bad 4-way bearings, bad sliders... $$$$
Agreed. I'll spend a few $$ to open up the G50 anyways to see what I am working with.

Cheers,

Sandeep
__________________
1966 912 Bastid - Carrera 3.2L - GT3076R - Bosch 044 - Intercooled - 55lb injectors - 0.5 Bar - Tial 48mm - Magnesium 915 7:31 - BBS E26 15x9, 15x10 - AEM Infinity 6
Old 06-08-2018, 05:04 PM
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