performance upgrades for a 911sc 3.0

[germaniac]

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

[Rot 911]

Weight reduction. Spare tire, jack, non working AC.

[JV911SYDNEY]

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

[joe payne]

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.

[Shaun @ Tru6]

sell your motor for $4500, buy a 3.2 for $5500.

[dweymer]

3.2 jug upgrade?

[sjf911]

Originally Posted by dweymer

3.2 jug upgrade?

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 .................................................. ................$

[jess p]

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.

[POORSH]

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?

[jess p]

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.

[red911sc]

Originally Posted by POORSH

has anyone done this to their 3.0?

Many here have done it, just do a search

[BART'S 911 SC]

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

[germaniac]

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?

[JR_NYC]

Originally Posted by jess p

Replacing your existing exhaust with an older style will gain you 17-22 hp.

Does this mean SSIs and e.g. an M&K or Monty exhaust will give an SC 17-22 hp more?

[dweymer]

Originally Posted by BART'S 911 SC

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

Nice looking engine! What pistons(cr, and any valve pockets) also, what venturis and jets on the webers.
Been dynoed?

[javadog]

Originally Posted by JR_NYC

Does this mean SSIs and e.g. an M&K or Monty exhaust will give an SC 17-22 hp more?

Yes and no. The biggest gain is in the midrange, where you can expect to see this difference. The area between 3,000 and 3,500 revs will show the biggest gain. There will be gains above this area and below it, but that should be where you see the biggest difference. At the power peak, the difference will be less than 10, maybe closer to 5.

JR

[BART'S 911 SC]

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

[Vincent 911]

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

[germaniac]

are these "must do" items or upgrades as we go along...

[wilke3169]

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.