Re: correct fuel distributor - Saab Saab Model 99 Bulletin Board - Saabnet.com
NG900 & OG93 |
Vintage Models |
Clubs & SOC |
Other Cars |
Books Movies & Music |
Member Photo Galleries |
Member Directory |
*Buddy Registry |
*Mileage Registry |
What's New |
Photo of the Month |
Sorry to be late the discussion!
The Turbo uses the same fuel distributor as non-turbo Lambda cars (Bosch 0 438 100 032). This is the easiest to use assuming you plan to use the entire Lambda system (oxygen/"lambda" sensor, modulating valve, electronic control module, wide open throttle switch, etc.) as it was installed on 1978-1980 USA spec 99 and 900 turbo cars. If you are planning to try to achieve higher than stock output from your engine, I'd suggest that you install a wide-range air-fuel ratio sensor so that you can monitor the actual operating mixture. This fuel distributor is at the outside of it's flow capacity in this application I think which may have accounted for a lot of engine failures when people raised the boost - they ran too lean.
The six-cylinder unit with 2 ports plugged was simply a way of getting a non-lambda fuel distributor with higher flow than the 005 and 023 4-port units (always try to use an 023 for not-lambda cars - it has a stainless diaphragm that won't rust and get holes in it). The six-cylinder unit will not necessarily be any better than the lambda 032 unit for fuel flow, I would not really think of it as an "upgrade", it's just non-lambda with the right fuel flow for the engine.
In an engine with 10-12 psi boost (probably the most that's reasonable with this engine given the spark control of the distributor) I would want to be running no leaner than 12.0:1 air:fuel ratio under boost, and it wouldn't hurt to be even richer than that. There is a "boost enrichment" Control Pressure Regulator 0 438 140 085 which may allow you to run richer than the stock system (I have one - thanks, Jimmy!! - but haven't tried it as I want to get the air-fuel ratio sensor installed first).
I definitely agree with the advice to get whatever Control Pressure Regulator and Fuel Distributor you will use rebuilt and then get the fuel system well-sorted before you start running the engine under boost.
Posts in this Thread:
Post a Followup
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
This is a moderated bulletin board - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the
Saabnet.com Mission and Purpose Page. Please remember that you are
not anonymous. Site Contact | Site Donations | Other Sites by SP -
Your address is: 18.104.22.168 - Using CCBot/2.0 (https://commoncrawl.org/faq/) - Logged.
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all
the Site Membership Benefits!