USE CODE: IK8Y48VL - This Amazon Pick is Recommended by Saabnet.com!
Site News - 7/11: No New News Today | 5/10: Members: Log In to See Fewer Ads!
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

9000 Bulletin Board
1985-1998 [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main 9000 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Boost tweaks
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by Bob (more from Bob) on Sat, 2 Feb 2002 13:59:51 Share Post by Email
In Reply to: Fun with a boost gauge & some related questions..., LDH, Sat, 2 Feb 2002 11:38:22
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup


>> Base boost appears to be about 8 psi. Aero guy cites .42-.48 BAR for the Aero base boost (so between 6.1 and 6.9 psi). According to that, base boost looks to be too high (or the gauge is wrong). Should I try to change it?

Probably not. The side effect of changing the length of the wastegate dashpot rod, which is how you adjust base boost, is achieving more or less accelerated boost. IOW, lengthing the rod will increase base boost and boost will come on quicker with less smoothness, sort of a "turbo lag" feeling as in older 2L cars. If your boost comes in smoothly, don't worry about the adjustment. If it was low, I'd say to get it up to specs, but the reading you're getting may be an inaccuracy in the gauge. Seeing the difference between 7 and 8 psi on a gauge when you're trying to drive is difficult.

>> Other than the base boost, does any of this information sound off?

No. The max boost levels are on par with my '95 Aero's readings, using a VDO gauge in the console.

>> The problems I'm dealing with are (as mentioned in previous posts) low-rev bucking or jerkiness....

Missing during FTO sounds like a bad DI cassette, but you stated the one on your car was new.

>> ...revs dropping momentarily when coming to a stop....

Could be that your new bypass valve may be bad, or somehow not in spec for your car. Did it do this before adding the new valve? Try swapping back to the old one, if you still have it, and see if you see any change.

>> ...and the occasional fuel cut when driving hard (which would be explained by the high base boost right?).

No. Trionic regulates max boost, and increasing base boost won't make any long-term changes. It may at first until adaptation gets things back where Trionic wants it. To my knowledge, there is no effective method of changing max boost without an ECU EPROM change.

>> I think that the vacuum numbers sound pretty good, so that rules out any possible vacuum leaks.

Check around anyway. How is idle smoothness? A vacuum leak will usually cause choppy idle.


posted by 68.11.18...
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
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.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2025 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
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 - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot


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!