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-   -   3.0l CIS upgrades? (http://forums.pelicanparts.com/porsche-911-technical-forum/1032022-3-0l-cis-upgrades.html)

Kwalls 06-12-2019 01:07 PM

3.0l CIS upgrades?
 
3.0l CIS and need guidance/suggestions on upgrading HP
http://forums.pelicanparts.com/uploa...1560373389.jpg

Jack Stands 06-12-2019 01:15 PM

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 06-12-2019 01:21 PM

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 06-12-2019 01:32 PM

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 06-12-2019 01:48 PM

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 06-12-2019 01:50 PM

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

Trippyloaf 06-12-2019 05:04 PM

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

http://forums.pelicanparts.com/uploa...1560387819.jpg

LakeCleElum 06-12-2019 06:08 PM

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 06-12-2019 06:34 PM

Quote:

Originally Posted by Kwalls (Post 10489587)
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.... :D

especially is you are already considering cams.

Trackrash 06-12-2019 06:45 PM

Quote:

Originally Posted by juanbenae (Post 10489859)
carbs are the best way to get more HP out of a CIS equipped car.... :D

especially is you are already considering cams.

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

Rawknees'Turbo 06-12-2019 07:40 PM

Quote:

Originally Posted by juanbenae (Post 10489859)
carbs are the best way to get more HP out of a CIS equipped car.... :D

especially is you are already considering cams.

http://www.puppetdesignstudio.com/wp...veman_club.jpg

pmax 06-12-2019 08:53 PM

Quote:

Originally Posted by juanbenae (Post 10489859)
carbs are the best way to get more HP out of a CIS equipped car.... :D

especially is you are already considering cams.

http://forums.pelicanparts.com/uploa...1560401577.png

Jonny H 06-12-2019 10:23 PM

See post 206.

http://forums.pelicanparts.com/porsche-911-technical-forum/894670-classic-retrofit-cdi-dyno-results-11.html#post10483546

Bill Douglas 06-12-2019 10:45 PM

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

Flojo 06-13-2019 12:35 AM

SSI and Max&Moritz-tuning with 3.2 Pistons

Nux 06-13-2019 01:54 AM

Quote:

Originally Posted by Flojo (Post 10490013)
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 06-13-2019 05:44 AM

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 06-13-2019 07:41 AM

Quote:

Originally Posted by pmax (Post 10489953)

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

G450X 06-13-2019 02:09 PM

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 06-13-2019 02:27 PM

Also the 3.1 kit and Webcam 20/21 grind


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