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How many turbo's here have a 915?

Now that I have a "fresh" 915. (was hoping to spend the money on a SBH930) I have begun to question the turbo plans.

I have no faith in the 915 at a transmission... so I fear if I go turbo I have to calculate the cost of a SBH930 trans into the mix.... which I assume are made of gold these days.

But then there is the stupid part of me that longs for boost and power and all the smiles and tears that go with it.

So I am wondering how many of the conversion guys are running a 915?

Do you plan to go to a different trans IE G50/SBH930?

Do you baby the 915, meaning you dont get to really enjoy the boost you have?

Old 08-22-2019, 04:20 PM
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I run a 915 in my 3.3 turbo bus. About 390+ chp. Wevo built the trans. I treat the 915 trans the same way as the 930 trans. I don’t baby it, and I don’t beat it. No plans to go to a g/50 or sbh930.
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Old 08-22-2019, 05:13 PM
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Crotchety Old Bastard
 
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I ran one in my SC with modified 930 engine for 15 years. About 10 of that was 300whp with a a stock and the last 5 went to 350whp with a WEVO modified 915. No issues if you don't beat on it. Let the turbo do the work.
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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 08-22-2019, 05:55 PM
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21 years and still going in my RST, DE tracked 10 of them, and ~400k km. Same 3.2 modified to3.4 turbo motor and 915. The 915 got new synchros in 2004 and a complete rebuild last year, just because.....not much wrong. But then I learned to be kind to my trani on a Model A crashbox so real double clutching (not pretend throttle”blipping”) comes natural to me.
Cheers,
Johan
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Old 08-23-2019, 04:04 AM
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Well, you could have had your transmission rebuilt with the 1 piece bearing retainer for next to nothing, along with the upgraded side cover with the enlarged 930 bearing. It would not make it bulletproof, but would definitely help. I did all of these things when I had mine apart after a second gear explosion. I’m definitely not easy on mine, but it is working well right now. If you aren’t willing to do a turbo conversion yourself, it’s gonna cost you a fortune. You cannot just slap a turbo kit on and call it good. You will need to convert to EFI, distributorless ignition. Etc. I would go with a 930 4 speed tranny, or G50, but it’s just too expensive. If you can buy a decent used 915 for $2000, I’d just assume have a backup transmission(which I have), and just trade them out after the next likely explosion
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1979 911SC widebody conversion. 3.1 engine, 3.2 liter heads, carrera intake, Microsquirt V3 ECU, K27 7200 High flow turbo, Tial F41 wastegate, Evo X intercooler, Ford EDIS. .7 bar. 402hp 360tq

Last edited by scottrx7tt; 08-23-2019 at 08:50 AM..
Old 08-23-2019, 08:47 AM
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Yea, I plan to do a rebuild on the engine next year or maybe the following, I want to make a decision before that on whether to turbo or not. I have a 3.2 intake already as a plan to replace the PMO carbs for turboing. I would follow that with aftermarket ECU.

Is everyone running a turbo distributorless?
Old 08-23-2019, 10:22 AM
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I use the Electromotive XDI on the 3.3 bus motor. Very simple set up.
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Old 08-23-2019, 10:54 AM
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Why run distributorless? Yes engine ignition management is more precise and flexible but certainly not mandatory. MSD units and the like will allow you to pull timing on boost.
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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
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Old 08-23-2019, 10:56 AM
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Quote:
Originally Posted by RarlyL8 View Post
Why run distributorless? Yes engine ignition management is more precise and flexible but certainly not mandatory. MSD units and the like will allow you to pull timing on boost.
Why not run distributorless? As cheap as an edis set up is these days. If you are running a boosted high compression engine. It just makes sense to be able to custom tailor a timing curve to optimize power/reliability. I have less than $100 in my whole EDIS setup, including wires. But you are correct, it isn’t mandatory, but if you are going to spend the cash to turbo and convert to EFI, you may as well while you are in there
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1979 911SC widebody conversion. 3.1 engine, 3.2 liter heads, carrera intake, Microsquirt V3 ECU, K27 7200 High flow turbo, Tial F41 wastegate, Evo X intercooler, Ford EDIS. .7 bar. 402hp 360tq
Old 08-23-2019, 12:23 PM
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915 trans will be OK if you don't subject it to wheel-hop/launches and keep the torque in check. If you wan't to go faster, make more power instead of torque. This trans is going to hold up better to a big turbo... I know it sounds counter intuitive but a bunch of torque down low is what you don't want. Size it larger than you'd think and keep the boost reasonable at peak torque and then feed it back as the revs rise/torque falls off. You'll get this nice centrifugal supercharger-like power band with flat torque that keeps parts in the case and still puts down a respectable HP number.
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Old 08-23-2019, 12:54 PM
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I do and just broke 3rd gear during a track day a couple of weeks ago. I plan to do a rebuild in a couple of months but will look for a 930 box in the meantime. if nothing surfaces or the asking price (for the 930 box) is way too much I'll proceed with the 915 rebuild with all the recommended mods for turbo power. I actually turn my boost down at the track to an unknown HP but turn it back up on the street to it's known 350-360whp. And try not to beat on it. The 915 (and my car, I'm asuming the tranny hasn't been rebuilt) had 190,000 miles on it. Not too bad for a hard working gearbox so it's ready for a well deserved rebuild.
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* 1980 911SC - 3.0l R.o.W 8.6:1 w/ Garrett 30R turbo conversion (.5 bar), Bitz MS-II EFI, Carerra intake, Zork tube, 2300lbs, 360whp

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Old 08-23-2019, 03:47 PM
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Even E class PCA racers break 3rd gears. They are mostly 25-30 years old now. A new modern gear of the same ratio is significantly stronger and more reliable. Same for 2nd.
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Old 08-23-2019, 05:21 PM
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I've run my turbo 3.2 at .5 bar behind a 915 that I had completely rebuilt back in 09. Its still holding up fine but I don't launch and really only hammer it in 3rd. I guess the answer is that yes the 915 will work but it wont be as much fun since your babying it.
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Old 08-23-2019, 05:29 PM
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I've run a 915 for 10 years in a protomotive 3.2. It was rebuilt during that time but not due to the turbo. Its not a fast shifting trans, either boosted or not. No issues at all. I don't "launch" the car, no point in that.
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Old 08-23-2019, 06:06 PM
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my 930 conversion project came with a 915. dont think it was ever on a track.

I kept reading how a 915 just would not hold up on a 3.3 turbo modified and doing track work. this thread is an interesting set of experiences. in the process of rebuilding the engine keeping CIS and shooting for around 400 hp/tq.

sold the 915, and when the friend rebuilt told me the gears were in pretty bad shape. after searching for a couple years found a short BS 930 gearbox. had been rebuilt and shortened.

move along...

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Old 08-24-2019, 07:22 AM
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Yea, I think the 930 SB is the best route to go, as with boost a little is never enough!
Old 08-24-2019, 10:38 AM
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I ran two 915s; the 200K+ mag case one was in a bad way inside after 20K with a turbo. Replaced with a late Carrera one built with all the available mods and internal spray bars; that held up pretty well for about 30K miles. Apart from the 40 year old tall 2nd that the 930 ate 4 teeth off of like a corn cob one day... And running through multiple clutches to find one that would hold the torque.

915s can last, especially at lower boost - and even at higher power levels if you don't launch hard and roll on the throttle at lower RPM in the lower gears. Continually womping on the loud pedal at 2K in 2nd (when your turbo can make 6 PSI at 2400 RPM and pull until you run out of cam) will probably not end well. Eventually.

It just gets annoying driving around the limitations of the gearbox - and you never quite lose the fear that you'll break something in a moment of stupidity. 5 speeds are great with a turbo and I couldn't deal with the idea of 4, so went G50. And now feel the need to re-gear...
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Old 08-24-2019, 11:51 AM
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I am 60/40 going turbo right now, I know I want the spool, the boost, the blow off, but I know that it will become a much more expensive project and might mean I don't get my Cobra kit fix down the road.

A g50 geared for boost would be amazing, but i'm pretty sure they are made of gold these days.
Old 08-24-2019, 07:02 PM
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Before you drop a lot of cash on a conversion you should look into picking up an old 930 or converted 911 with a 930 engine and transmission then you can sell what you have. I doubt you'll be happy with .5 bar and a 915 for long and for the cost to do the conversion the way it should be done you can probably move up to what you wanted in the first place. 1 bar is very exciting, several levels above .5 bar and IMHO drives and sounds more like a race car than a n/a 911.
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Old 08-25-2019, 05:23 AM
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my original plan was to have my 930 gearbox regeared. but I have too many cars/projects and decided to initially install this gearbox as-is. I have a clutch kit that was on the car with the 915 and trying to figure out what I have and may use it too.

then somewhere down the road, if I live long enough, have it rebuild and regeared and add LSD.

if I dont stop dreaming up more things to do to it it will never get done.

about to strip/blast for paint.


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Bob Cox
84 928S, Ruby Red linen/brown interior - preferred DD
87 924S resurrect and gut and another track car...
86 944 turbo my new DE/track car.
78 930 clone project car.
Old 08-25-2019, 07:00 AM
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