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Porsche Crest 1978 911 sc questions

hi ive got a 1978 911 sc with roughly 100k on the motor. its fun to drive and love the handling but want to make it alot faster
ideally 350hp turbo

what would be the smartest way to approach this project?
Old 05-28-2007, 10:13 PM
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Hate to sound flippant but I seriously think the smartest approach is to sell the SC and put the money towards a WRX. Sure, it's possible to do what you want but it wouldn't be cheap and it's one of those things that if you have to ask how to do it you probably shouldn't be trying it yourself.
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Old 05-28-2007, 10:35 PM
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well i just recently got the sc so im new to the porsche scene and would hate to have to sell it. WRX? if your speaking of the subaru im not really interested in that car. dont get me wrong great car and superb handling but ive really fallen in love with the SC. i myself wouldnt be doing the actual installation work...
just interested in a couple tips towards getting some power out of that flat six
Old 05-29-2007, 11:25 AM
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There are a few here that have done turbo conversions. You'll be limited on how much boost you can use due to the high compression. This could probably be done for about $5K to $30K depending on what you want. Another option would be to buy a 930 engine which would run about $10K.
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Old 05-29-2007, 11:46 AM
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thanks for the advice! i saw your 79 930 on a thread a couple days ago and was really impressed with your 930 looks great! know of any good websites for the 930 engine? and realistically would wou suggest the engine swap or the engine conversion?
Old 05-29-2007, 11:54 AM
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The engine swap would be the easiest. Some dismantlers that come to mind are Parts Heaven and DC Auto.
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Old 05-29-2007, 01:22 PM
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What is your budget?
I also once had a '78 SC with 80K miles and needed more power .............

The smartest way to approach the project is to sell your SC and buy a 930. This isn't about smart, it's about having fun with a project.

The way you approach the conversion directly depends on your budget. Turbocharging an SC engine with 100K miles on it is probably not a good idea unless you keep the boost really low, which defeats the purpose.

Next question: 350FWHP or 350RWHP? Huge difference in cost when you cross that line. The 915 can live at 350FWHP but not at 350RWHP.
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Old 05-29-2007, 01:51 PM
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well i just purchased the 911 recently so i dont think ill be selling it any time soon. im planning on making this a long term project and im going to a technician school this year so i bought the car to take with me there and begin the project.

i guess making the sc motor turbo is out of the question since i wont be able to boost high n make power

know of any companies that sell 930 engines or an later model engine that might be able to sustain the boost presure of a turbo?
Old 05-29-2007, 02:31 PM
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Hi Nickolas.
Like you I had a Norm Aspirated 911.
I was hungry for more power but as stated earlier the 915 tranny is your problem.
It is sad but true, you would be better off (cheaper) to buy a 930. I did this and now own both as I cannot bear to part with my 911.
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Old 05-29-2007, 03:06 PM
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buy a 930 , I have been working on a 86 GTI converted to a VR6 for 3 years and lost all desire to finish . at this point I just want to sell it to free up space so i can play cricket again(darts).
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Old 05-29-2007, 03:56 PM
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The SC engine will operate safely at 5lbs of boost and with a 7th injector at 8 to 9.
Start reading this thread, my engine started as a 79 SC I had no problems with it running 8lbs with the fuel enrichment and you will see close to 350hp.

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Old 05-29-2007, 05:24 PM
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The problem is not that your SC engine cannot produce 350HP when turbocharged, the problem is you have 100K on the engine.
I would not tubocharge an engine with that many miles on the clock unless I knew the history. A PPI won't tell the entire story.

If you really want a project you can rebuild your 3.0L with lower C/R and then turbocharge it. The 915 is your limit on power. If you want more than 300 ft/lb or torque then add a 930 4spd or a G50 to your budget.

After all that you'll want to add suspension mods and big brakes. All these costs are the reason everyone is telling you to sell your SC and buy a 930. For $25K you can buy a decent 930. 'Course then you'll want to mod it as well, ha!
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 05-29-2007, 05:52 PM
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keep the SC for daily driver and get the 930 for a quick buzz
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Old 05-29-2007, 06:06 PM
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Nicolas,
I have a nice Carrera widebody turbo conversion car that I am planning to sell (very reasonable) that will cure you appetite for power, has ALOT of expensive mods, and is as reliable as any you will find. If you decide you are seriously interested in a car like this, just send me a PM.
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Old 05-29-2007, 06:07 PM
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I just got my SC running tonight, on a total rebuild with an old BAE kit (well, the design is old, every freaking thing in it is rebuilt or modded).
I still have to get it sorted a bit more, and take it to the dyno. I think 350 HP on an SC with a turbo is unattainable for practical purposes.

Unless you have lots of money, time, and expertise in these matters, or want to hand it to someone to put in a kit for you, I'd go the 930 route. This is not bolt on HP.

Pat
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Old 05-29-2007, 06:53 PM
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I built my 79 SC engine up with 91 3.3 turbo pistons and cylinders and offset modified rod bushings giving it a slightly longer stroke. The SC engine is a good base engine to start with to turbo, very strong and has good cams, I added a euro fuel distributor and an 86 turbo intake to it , twin plug and 930 oil pump that is basically it. I have a K27 7200 with Tial wastegate and Bov. Should make for a nice little 3.1 engine.
I am getting closer to getting the engine back in the car, I will let everyone know how it turned out.
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Old 05-29-2007, 07:00 PM
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I bought a hybrid car with uprated wheels, tires, brakes, torsion bars and a mildly-tweaked RoW 930 motor for close to what it cost the previous owner to buy a used 930 motor and give it a top-end rebuild.

I've had to replace the original 915 with a late 3.2 alu one - modified to (hopefully) help it last.
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Old 05-30-2007, 01:35 PM
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you guys have been very helpful and ive learned alot in this thread so i gata tahnk you guys.
i am going to keep the SC as a daily driver and will be looking into a possible 930 purchase but we'll see how things go
Old 05-30-2007, 02:06 PM
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