Sameer

911 2,
Our cars dont have any ECU. The CO mixture can be adjusted and I would recommend 3-4% CO for mods with CIS.
Maybe someone should post pics of how to adjust the CO??Anybody?

duxducis

And what do you guys think about rising fuel pressure instead of CO adjustment?

Miles965uk

If im right you can only rise the pressure with EFi - with CIS you only have the CO mixture and some guys have adjusted the WUR, duty cycle as well but to be honest EFi would be the way to go- i think soon all CIS will have to be converted if stricter laws come in- which could happen with all this worry about global warming...

duxducis

What do you think about this method? Can adding shims at line pressure regulator help solving problem?

Sameer

Check this out:

duxducis

As I see that is the same book.
Turning Allen screw left or right is only for idle mixture. Does this CO adjustment affect whole RPM range? I think not. Maybe I am wrong??? Realy don t know.
What do you guys think? Is it better to adjust CO on idle or increase system pressure by adding shims at line pressure regulator, or both?
I read a lot about CO idle adjustment on several Porsche forums, but I have never read something about increasing fuel pressure in the way described above.

Miles965uk

Hey now this is something new to me too... I will look into this and see but as said above I really want to ditch it anyway. The parts on our CIS babies are astromical from Porsche anyway just wouldnt make sense if something like the WUR or fuel distr' broke