Thread: Turbo on a 3.0
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RarlyL8 RarlyL8 is offline
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,356
The GT35R is too big to slap on an SC engine. If going Garrett the GT30 would be a better fit.
Garretts do not have the same oiling requirements as KKK/BW turbos. If you do not plan on using the stock 930 turbo oiling system then you can plumb specifically for the Garrett.

The Aerocharger system might be a viable option as you have to purchase the entire exhaust system anyway. The cost is a bit high but that is for you to decide. Characteristics look to be very different than a typical turbo.

Because you have an SC engine you have the advantage of larger heads and of course SC cams. Both a plus for turbocharging. The higher C/R is good as well because it is not too high and you can still run some boost. Don't get greedy and you'll have a fun car. Keeping the SC engine and adapting a turbo will be all about taking advantage of the SC's components. You'll want a turbo and exhaust system that is complementary to enhancing the current power band. The tbitz EFI with a low threshold turbo and free flowing exhaust should make for a very responsive and powerful ride.

Swaping to a 3.3L 930 engine is iffy as far as money is concerned. Yes you can buy a 930 engine for $8K and sell your SC engine for maybe $4K. You will easily spend the same $4K turbocharging your SC engine. Problem is the 930 engine you buy will likely be stock or close to it. Then you will want to change the turbo, exhaust, intercooler, etc and spend a whole lot more money. To make that (math) work you have to buy a known good 930 engine that has the goodies already on it.
You can also remove all the turbo stuff if/when you sell the car, then sell the system.

Sell SC and buy 930 will cost you $10K-$15K difference.

Consider the tranny as well. The 915 is a quick ratio fun box for the street where a 930 4spd begs to hit the interstate. If you bolt a turbo on the stock SC engine the 915 should handle the increased power and torque.

I don't mind phone calls and emails asking questions, I enjoy this stuff!
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 07-10-2010, 07:55 PM
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