your injectors are too small and RRFPRs are aweful .... - Saab Performance Bulletin Board - Saabnet.com
NG900 & OG93 |
Vintage Models |
Clubs & SOC |
Other Cars |
Member Photo Galleries |
Member Directory |
*Buddy Registry |
*Mileage Registry |
What's New |
Photo of the Month |
those injectors are like 18 lb hour
the stock fuel chip will hit 100% dutycycle pretty easy by 4000 rpm I got it to hit 100% by 3500rpm with a T3/60 add to that a rrfpr and you have a nasty wet spot at 3500-4000rpm and lean out from there if you were running an apropriatly sized injector
my advise is run 280 150 431 injectors and one of my chips and ditch the rrfpr... but if your rrfpr is adjustable you can turn up the pressure with your injectors and maybe not kill another engine .... the problem with running small injectors at really high pressure is that you cause the pump to run low volume high pressure ...you want to run a C900 pretty rich at full boost because of the horrible timing control so 10.5-11.0:1 is good.... your timing best setup will be like 9 or 10*BTDC which is way too advanced for over 15PSI ....if you try to retard it any further to get good full boost timing it will run horribly everywhere else because it wont be advanced enough....
if you look back on what I and others have written its all there everything you need to know is in the archives
good luck to you and have a great week
injector flow chart
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!