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Join Date: Jan 2004
Location: Sacramento
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Turbo 915?

Will a 915 hold up to a turbo conversion w under 400hp.

Mostly a street car w LSD and no more than 245 Toyo R1's tires under a narrow body?

Would not be beating it w spin the tire launches.

Would a reinforced side cover solve much of the issues.

Would it hold up for a 20 min DE event?

Thx in advance.
Old 06-02-2008, 07:47 AM
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Crotchety Old Bastard
 
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There are many things you can do to help the 915 live in a high torque environment. The most important being don't beat on it. No drag racing and no wheel hop.
WEVO makes a nice bearing retainer that gives reinforcement, a late model side plate cover will help as well as an LDS. A trans oil cooler is manditory if you plan to track it in a warm climate.
My personal rule of thump is to not exceed 350 ft/lb of torque. Any more than that and you can litterally destroy the tranny at will.
Others will hopefully chime in with their experiences.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-02-2008, 11:28 AM
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Max Sluiter
 
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+1 for RarlyL8

Torque is the real stress on the transmission, more so than horsepower. High horsepower through high revs and low torque can be used with much less work than high torque. High horsepower would mainly be the cooling issue and making sure oil is getting where it needs to be. Torque needs reinforcements like steel bearing retainers.

What kind of torque curve/numbers do you expect or plan on?
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Old 06-02-2008, 11:56 AM
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I think the 915 trans is strong. We tend not to give it as much credit as we
should. I have an 84 915 behind my 350 SBC with 400hp and 400 torque.
Although I don't drag race it I do punish it from time to time. It's 2 years
and still going strong. Rarly8 has some good recipes for making it even stronger.
Old 06-02-2008, 12:35 PM
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Greetings..
I knew what I was getting myself into and I just opened the gearbox up and took a look. I replace all syncros, gaskets, oil rings, etc.. I didn't touch the dogteeth, even though 1 and 2nd looked a little worn.. 3RD-5TH looked good. My gearbox slides like soft/butter. I can put my car into any gear at any speed. It can be dangerous if u have short shift as myself. I WOULD NOT DRAG RACE IN 1ST. 2ND GEAR BE CAREFUL. 3rd is my favorite gear...I normally double pump the throttle and go from 4th to 3rd...if i really want to boogie....I did tons of work on my car. I Love it...BEWARE ...Upgrade the brakes...Very dangerous...Becuz I CAN'T STOP.

Walter.



Old 06-02-2008, 12:54 PM
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Thinking of a simple low boost .5 bar blow through set up on my 85 Carrera 3.2 w no spoilers. Is supposed to be about 350 hp, do not know the torque but could back into it.
Old 06-02-2008, 08:37 PM
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