Technical reference for 930 CIS

[jrl]

After much reading, I'm still puzzled as to what flavor CIS / x-Jetronic (K, KE, etc.) is in the 86 930; have even read a couple of references to Motronic being in 86-87 930's. Which of the Bosch references sold by Pelican is best describing 930 injection and engine management?

Also, as a lower cost alternative to full Porsche factory manuals, would a Bentley manual (Carrera or SC?) plus the factory Turbo book be a reasonable substitute (plus Wayne's 101 and Engine Rebuild)? Not going to do much work myself, just want to understand more about the car.

[ianc]

The factory manual is actually pretty poor. The Bentley is much better and cheaper, although there are still some mistakes in it...

ianc

[Grady Clay]

This is actually a fairly complex subject and a good question.

There isn’t a concise single source I have ever seen. The Factory publications are the best and can be supplemented with the commercial manuals. There is no substitute.

Fully understanding your CIS starts with the ’73.5 911T Factory publication 4523.20 Porsche 911T K-Jetronic Service and Training Information Model 1973. There are perhaps 15+ publications in this series that explain each new variation of CIS, including the Turbo. The 911 and Carrera Factory Workshop Manuals for ’72-’83 and ’84-‘89 also contains a lot of very useful information. The Turbo specific Workshop Manuals also are necessary. Each assumes you have read and understand the prior versions including the normally aspirated 911s.

After I finish the MFI CMA2, in my next life I’ll edit a comprehensive CIS manual.

Best,
Grady.

[ianc]

Grady, you are the master of all things, but how you can describe those meandering incomplete factory workshop manuals as the best is quite beyond me. Bentley has better, more thorough, better indexed and more complete procedures for nearly everything... I'm thinking of selling my factory manuals before long. Granted there are some odd bits of rare and useful info in there, but if I had to choose only one...

ianc

[dean]

Originally posted by jrl

Also, as a lower cost alternative to full Porsche factory manuals, would a Bentley manual (Carrera or SC?) plus the factory Turbo book be a reasonable substitute

That would be the most cost effective way I think. I don't think the Bentley covers the Turbo at all. And like Grady says the factory books are the best.

There are some CIS books out there but I don't know a really good one.

Dean

[RarlyL8]

I have several manuals on CIS and factory work manuals for the SC and 930. The best information I have read concerning the specific 930 application came from two sources.

The first are the schematics included in the 930 manual. Priceless. They picture all the various CIS configurations for engines produced for different countries (including California).
The second is the book " Solving Bosch Continuous Injection System (CIS) Problems - Theory, Diagnosis, and Repair of the K-Jetronic and KE-Jetronic Family of Bosch Fuel Injection " by James Weber. Simple to read book, has pictures and descriptions of the various components of CIS.
You can use that book and the 930 schematic to identify all your components and how they work with each other.

Another source is Jim Williams CIS primer over on Rennlist.

[jrl]

Gentlemen,

Excellent advice and suggestions--I'd wondered if Weber's book might be good. Right now, I'm thinking a good library might be 1) Bentley Carrera manual, 2) factory 930 turbo manual, 3) Weber, 4) 101 Projects, and 5) Wayne's engine rebuild. Hand-wave cost is $500-550. Seem reasonable?

Appreciated,
John