3.0l CIS upgrades?

[Kwalls]

3.0l CIS and need guidance/suggestions on upgrading HP

[Jack Stands]

Have you seen Bruce Anderson’s book? I think that other than changing to 964 cams or increasing displacement, your options are limited with the CIS injection.

[darrin]

believe swapping to a 2 out (e.g. ssi) exhaust helps out too.

Kwalls, welcome to the forum -- looks like you've already hotrodded your SC -- what have you changed up on it so far?

[Kwalls]

I have not looked at his book but, will check it out! I'm thinking of 964 cams and going with PMO's just not sure if the cost levels with the gain in hp?

[Kwalls]

Love this forum! The car has had the following from the previous owner:
- engine rebuild & gearbox
- 16x7 & 9 fuchs
- open can sport muffler
- suspension upgrade

Super fun and I have a lot to learn

[jac1976]

Switch to 15s. Did I beat Bill to it?

[Trippyloaf]

What’s going on here? Looks like it might be setting you back.

[LakeCleElum]

Kay Wall(s): In my 73.5 with short gears:

My 3.0 with CIS is reportedly making 209 HP at the rear wheels. Here is a copy of the ad from when I bought the used engine: Note is has high compression 3.2 and early exhaust also:

Recently removed upgraded '81 SC engine and transmission from my '81 SC after car was damaged in front, causing parting out the car. Upgrades include 1) Max Moritz 3.2 liter pistons and cylinders, 2) 964 cams, 3) Raceware hardware, balanced rods, Carrera oil pump. New parts included: intake valve sleeves, rod bearings and rods balanced, and rocker arms.

[juanbenae]

Originally Posted by Kwalls

I have not looked at his book but, will check it out! I'm thinking of 964 cams and going with PMO's just not sure if the cost levels with the gain in hp?

carbs are the best way to get more HP out of a CIS equipped car....

especially is you are already considering cams.

[Trackrash]

Originally Posted by juanbenae

carbs are the best way to get more HP out of a CIS equipped car....

especially is you are already considering cams.

Especially if you replace the pistons as well....

[Rawknees'Turbo]

Originally Posted by juanbenae

carbs are the best way to get more HP out of a CIS equipped car....

especially is you are already considering cams.

[pmax]

Originally Posted by juanbenae

carbs are the best way to get more HP out of a CIS equipped car....

especially is you are already considering cams.

[Jonny H]

See post 206.

Classic Retrofit CDI+: Dyno Results

[Bill Douglas]

SSI exhaust system adds some HP and loses weight from behind the back wheels.

[Flojo]

SSI and Max&Moritz-tuning with 3.2 Pistons

[Nux]

Originally Posted by Flojo

SSI and Max&Moritz-tuning with 3.2 Pistons

+1

although a little expensive, this is a well proven and plug & play solution with no other mods needed. About 220-225hp.

[RarlyL8]

We supply modified CIS components for race cars. The fuel distributor is modified for higher flow and the WUR can be made adjustable if needed to compensate. This is generally done to satisfy spec class rules. If your class has no rules on induction then carbs will give a bigger bump. The difference in fuel mileage and smoothness is noticeable however and a consideration.

[juanbenae]

Originally Posted by pmax

OK pnutz, that one made me laugh out loud....

[G450X]

You didn’t mention what year your SC is, but from what I’ve read, early (‘78/‘79) U.S. or euro CIS is a bit simpler and flows better, and will better compliment the 964 cams, higher compression stock pistons & cylinders (or Max Moritz 98mm), SSI’s, exhaust, etc..

If you find additional coin, a 915 with shorter gears, or R&P swap can enhance the mechanical advantage as well.

Good luck, an SC on a bit of a diet with a slightly tweaked engine can be fun and reliable...

[jac1976]

Also the 3.1 kit and Webcam 20/21 grind