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Join Date: Jun 2007
Location: Boca Raton/Atlanta
Posts: 544
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performance upgrades for a 911sc 3.0
Hi guys,
I am trying to milk to most power possible from my little 3.0 SC I know of the following upgrades: heat exchangers -or- cat by-pass air filter (minimal) what else are my options regarding power? ThaNKS, ROB
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Rob L. Currently have too many cars to properly care for ![]() |
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,496
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Weight reduction. Spare tire, jack, non working AC.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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Skunk works
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besides headers (SSI) and a sport muffler there isnt a whole lot to do that isnt going to cost $$$. you could get a new cam and a set of reconditioned weber carbs. thats about it without pulling the engine apart
+1 on the wieght reduction...rear seat, a/c, smog pump
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964 RS-4 |
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With the tough smog laws in California, I have gone with the weight reduction/better handling/improved braking route.
I also have a 3.0 litre and less weight has really improved the overall performance. I swap a cat by pass every 2 years for a cat and smog test, and the by pass seems to let it breath better. Everything else is either totally illegal or very expensive.
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jtp911 |
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Join Date: Dec 2001
Location: Cambridge, MA
Posts: 44,428
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sell your motor for $4500, buy a 3.2 for $5500.
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Tru6 Restoration & Design |
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3.2 jug upgrade?
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Donnie Currently Porsche-less..... ![]() |
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And for a little more, throw in a 3.2 crank and rods and go 3.4.
And a little more, and a little more, and a little more .................................................. ................$
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Steve Sapere aude 1983 3.4L 911SC turbo. Sold |
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Join Date: Jun 2002
Posts: 895
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Replacing your existing exhaust with an older style will gain you 17-22 hp. Going to Webers 40 ida 3c will get you 20-30 hp and better throttle response.
If you want to do internal engine mods you could install 3.2 p/c with ge 40 cams and weber carbs, older exhaust for a total of 250-260 hp. But if you really want some hp for about $800.00 install a turbo and see 300 hp and ~325 tq. You can buy a turbo(new) off ebay for $250.00. A tial valve for $50.00. misc parts and plumbing and a 914 cold start valve with pressure valve. |
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Join Date: Dec 2005
Location: Bay Area, Ca
Posts: 877
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I, too, have been thinking about this same problem with my SC. What is the longevity issue with going turbo? has anyone done this to their 3.0?
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Join Date: Jun 2002
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As long as you don't get crazy on the boost. Keep the boost no more than
.6 bar and you'll be fine. Remember, the sc is a 930 box. |
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Join Date: Jul 2004
Location: The east side of the Midwest.
Posts: 579
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Many here have done it, just do a search
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Jeff '79 Widebody SC |
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This motor was 3.0 sc some time ago...J&E pistons,964 cup cams,40 webers,backdated exhaust with dual in dual out M&K muffler
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Join Date: Jun 2007
Location: Boca Raton/Atlanta
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guys,
I like this turbo idea...anyone give me a shopping list of what I need? Expected costs to get a "pro" to install? In short, is it cheaper than buying a turbo engine?
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Rob L. Currently have too many cars to properly care for ![]() |
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Location: Chicago
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Does this mean SSIs and e.g. an M&K or Monty exhaust will give an SC 17-22 hp more?
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'82 SC pewter metallic Time and Relative Dimension(s) in Space |
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Quote:
Nice looking engine! What pistons(cr, and any valve pockets) also, what venturis and jets on the webers. Been dynoed?
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Donnie Currently Porsche-less..... ![]() |
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Join Date: Apr 2005
Location: outta here
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Quote:
JR |
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CR is 9.5:1,yes they have machinned valve pockets,as webers set up for now I have 36mm venturis,180 main jets,65 idle jets,can not drive it too much beacouse of this year chicagolands tough winter
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Join Date: Aug 2007
Location: Auburn Hills, MI
Posts: 122
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Depends on how many miles your engine has but I would start with a valve job.
While you are there change yours camshafts regrind to 964 profile: $250. Maybe 9:5 or even 9:8 pistons: $1000 new. SSI + sport muffler. Vincent
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Red 911 SC euro 78 - 964 cams, Carrera tensionners, new steel head studs, SSI & dansk 2 in 1 |
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Join Date: Jun 2007
Location: Boca Raton/Atlanta
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are these "must do" items or upgrades as we go along...
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Rob L. Currently have too many cars to properly care for ![]() |
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Join Date: Jan 2004
Location: Charleston, SC
Posts: 821
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I rebuilt mine 3 years ago. had 170,000 when I did it now has close to 190,000. 9.5:1 J&Es, 964 cams, SSIs with a Monty dual out. All done because it happened not because of a grand plan. Bought the SSIs and Monty here, One piston skirt was broken so I replaced pistons, Cylinders were out of spec so I replaced those as well. Cams just seemed to make sense while I was in there.
Lack of track experience makes the car faster than I am. I am working on that again this weekend.
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Kevin '79 Coupe |
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