Whats easier to get more power out of at a Cheaper cost An SC or Carrera?

[RaF944]

Well as we all know the SC as 3.0 engine and the Carerra 3.2 has a Motronic motor that can be chipped.... So I read of a few mods for both.

I know that the 3.0 can be built up to a 3.2 fairly easily with good hp results. And I read that the 3.2 can be built up to a 3.4 or 3.5 liter.

I also read about superchargers for both... but can the Carrera motor hadle more power and get that horsepower cheaper? I am thinking in the 300hp to 350hp range or anything simple that will get them up to 250hp

Thanks for the feedback

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85.5 Porsche 944

[Doug Zielke]

The con-rod bolts used in 3.2's are made of cheese. Install Raceware or hi-quality equivalent before you decide to blow on your 3.2.



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'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
The Blue Bomber's Website

[RarlyL8]

Cheap? You gotta be kidding, we're talking Porsche here.

Jokes aside, the CIS is the limitting factor for the SC engine. Motronic is tunable and will accept more mods, and you get 0.2L free.

[Formerly Steve Wilkinson]

I've taken my once-stock 3.0 SC engine to almost 3.4 liters (100mm p/cs), twin-plugged it, substituted PMO carburetors for the CIS, S cams, headers, Fabspeed "amplifier," aluminum clutch and flywheel etc. etc. (Raceware studs, ARP rodbolts, the proper valve guides and followers and all the rest going without saying, I hope.) I built the engine in my basement--first time I ever did a 911--and there weren't even any pieces left over; at least none big enough to have p/ns...) I love it. Was it a bargain? Oh, yeah... But if I'd wanted a bargain I'd have bought an off-lease C5 Corvette. What racing class am I in? I haven't the faintest idea, but the little dear sounds great.

Stephan

[rattlsnak]

If your anything like me take this advise..... I have had several 911's over the years from 3.2's on down to 2.2's that I club raced and done PCA stuff in that I have done all sorts of mods to including crankfire, digital fuel injection, cams, pistons, carbs, k&n's, etc etc, Everytime I have been totally happy with what I have done, -until I go to track events. I get so pissed when turbos blow past me. The last mod i just completed was installing a C2Turbo engine into an SC car. OMG! It is pure awesome. Not saying that my old setup or anyone elses cars are slow or not as good or as fast, but Im telling you, I wish I would have done this LONG ago!!
Just my .02 worth!

[CamB]

Originally posted by Stephan Wilkinson:
I've taken my once-stock 3.0 SC engine to almost 3.4 liters (100mm p/cs), twin-plugged it, substituted PMO carburetors for the CIS, S cams, headers, Fabspeed "amplifier," aluminum clutch and flywheel etc. etc. (Raceware studs, ARP rodbolts, the proper valve guides and followers and all the rest going without saying, I hope.) I built the engine in my basement--first time I ever did a 911--and there weren't even any pieces left over; at least none big enough to have p/ns...) I love it. Was it a bargain? Oh, yeah... But if I'd wanted a bargain I'd have bought an off-lease C5 Corvette. What racing class am I in? I haven't the faintest idea, but the little dear sounds great.

Stephan

Stephan - do you have any pictures of the car (well, the engine) - it sounds awesome.



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Cameron Baudinet
1975 911S (in bits)
1969 911T

[Early_S_Man]

As to the original question, it is neither cheap nor very productive to modify a 3.2 DME Motronic engine, unless you are talking traditional hotrodding ... throw away the entire Motronic system and start bolting on the same things you would to an SC emgine to make it go past 6500 rpm.

To modify a 3.2 DME engine, you are limited to SSIs and the 964 or 20/21 cams, and if you plan on taking it past 6800 rpm, you HAVE TO TEAR IT DOWN & PUT RACEWARE or ARP hardware inside just to keep the INSIDES -- INSIDE THE CRANKCASE!!! Otherwise, perforated crankcases and forged steel SHRAPNEL IS THE MOST LIKELY OUTCOME!

So, choosing a 3.2 to start with loses any benefit of the extra 200 cc's very quickly! The weak 9 mm rod bolts are a deficit that is expensive to overcome, and the DME system so limits your options to practically nothing, compared to cams, carburetion, displacement increases, and a 10,000 rpm redline, depending on your budget!

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

[RarlyL8]

The optimal word was CHEAP.

None of these mods listed are cheap. Cheap means keeping the stock FI system. You can't gain a lot of power with either engine given those restraints.

That said, I (obviously) would follow Rattlsnaks advice. There is NO substitute for boosting!

[epbrown]

I think the operative phrase is "SC or Carrera" actually. Which of the two is cheaper to get more horsepower out of? Me, I think "The Olsen Solution" tends to be the best bet. Snag an early car, swap engines, go to town.

For my own modest needs, I'd love to snag a 1969-1973 911T targa in one of those candy colors that screams SEVENTIES!, throw in an SC motor with SSI and Weber carbs, and let the good times roll. The combination of lighter weight, improved low-end torque, and modest horsepower gains strike me as satisfying, while not requiring a tremendous amount of modding or machine-shop work.

Emanuel

[Jack Olsen]

I like the Olsen Solution, too. You can get 250 hp without having to modify the engine and run the risk of reduced reliablity, and -- importantly -- you're off the hook for smog, at least in Californa, which opens the door for exhaust mods, PMOs, or boost. Light car plus a big, reliable engine with no limitations on improvements down the road.

Now that the oil temperatures are where I want them, I have nothing but good things to say about the whole scheme.

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Jack Olsen
My Rennlist page • My Pelican Gallery page • My Porsche Owners Gallery page

[RaF944]

Guys I never said CHEAP...you guys are puting words into my mouth... I said as epbrown stated Cheaper from the 2... That means which of the 2 would cost less to supe up?

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85.5 Porsche 944

[Natchamp]

Raf, what's your intended use for the motor? Street, Autox, speed, power, etc. What type of package?

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Mark
The Beast
mark@hargett.com

[RarlyL8]

If that is the case then I vote neither one.

You have to ditch the fuel injection systems and go inside the motor to get more out of both. That costs pretty much the same for any Carrera or earlier 911 engine.

[RaF944]

Originally posted by Natchamp:
Raf, what's your intended use for the motor? Street, Autox, speed, power, etc. What type of package?

\

I'd say for street



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85.5 Porsche 944