Adding webers to 3.0 CIS Sc
 

Has anyone converted their Fuel Injection car to carbs?I was curious as to the performance/reliability/noise with this mod? Also would you have problems passing smog certification?Thanks

Illegal for smog, at least in California. Not a performance upgrade unless you change the cams. And yes, the intake noise is significant....

Mike is right, the CIS requires a very mild cam, the main reason for going to carbs is to be able to dump the CIS cams.

If you are not concerned about smog regs, it seems like a nice upgrade for an SC is to backdate to the earlier exhaust, Bruce Anderson says this alone is good for an honest 17-22 hp! If you look at the stock SC exhaust, you will see why this is possible, the stock exhaust forces the exhaust through a very small opening.

Brian

Thanks for the replys

In case you are interested, I am rebuilding my 3.0 top end. I have added the 964 cams and updated to 993 studs as one of them broke, requiring the rebuild. I also did a valve job and replaced the cam chains....Pelican did their now normal impossible job on obtaining all the parts in record time and price.

It will be done tomorrowish. I will let you know how it works out...

[This message has been edited by mikez (edited 11-01-1999).]

I'm curious to know what parts you needed to switch the 3.0 SC to the Webers. I have an '82 Targa and have been thinking about it. Thanks

You should check to see if you can even license the car for use on public roads. Don't think you can, at least in most states. Check before you do it.

A car that new w/ the FI changed to carbs would never pass at least the 'visual' emissions check...they look to see if all the original emissions equipt is there - carbs aren't original, even if you can get it to pass the tailpipe test.

Legally it shouldn't pass but I've never met a smog inspector that knew anything about 911s and if I had that problem he would be a very rare individual and I'd just drive down the street, my car has the smog pump removed along with the cat from the POs and I don't think the inspector would know the car did not come with carbs .
Even with my emission equip removed it passes with flying colors but I know carbs run dirtier which is probably why Porsche went to the FI for the new emission requirements in the 70s I am just wondering how much dirtier the car would run

[This message has been edited by jryerson (edited 11-02-1999).]

Great question because I was thinking the same thing. I have a 1979 Euro SC. I has have a letter from the EPA exempting it from visual inspection. It currently runs under half the allowable emissions on the sniff test. Would the carbs make that much of a difference?

Rich

In Colorado it wouldn't matter a bit that it passed w/ flying colors. The computer at the smog tester tells them, base on make, model, year exactly what equipment the car is supposed to have, and where on the car to find it.

Happened to me w/ a 77 BMW that was supposed to have a smog pump and hadn't for 20 years. Passed the test easily - but was red tagged because of the pump.