The banner above is an advertisment - if it asks you to download software, please ignore.
Site News -
7/1: Members: Log In to See Fewer Ads! |
5/28: SAAB Evolutions/TSN T-Shirts $14
[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]
[Main C900 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: No turbo boost on gauge!!!!!!
Posted by JohnB (more from JohnB) on Tue, 9 Jan 2001 07:41:36
In Reply to: No turbo boost on gauge!!!!!!, Ken Westers, Mon, 8 Jan 2001 22:12:41
Members do not see ads below this line. - Help Keep This Site Online - Signup
With engine off the needle should be straight up at the border between yellow and green or white, usually a white band. Indicates zero vacuum or atmospheric pressure. Note this position is the same whether at sea level or 10K feet altitude. This is why the car loses some power at altitude due to gauge pressure rather than absolute pressure engine control (ok, waste gate is gauge pressure too, as is pressure transducer for fuel pressure).
If the needle goes to the left indicating vaccuum but doesn't go to the right indicating pressure, it is possible the gauge is bad but more likely you have a pressure leak (and maybe a vacuum leak that is overcome by the engine, otherwise it wouldn't idle) under load. Round up the usual suspects and check for vacuum leaks at the intercooler (if you didn't have this problem before you did the intercooler and the new apc, wallah!). I wouldn't be surprised if your hooter valve or compressor bypass valve was also leaking, which would bleed pressure off around the compressor and give you these symptoms...ok vacuum, little boost.
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.
StateOfNine.com
![](/tsn/xyz/stateofninebutton.gif) |
SaabClub.com
![](/tsn/xyz/scnabutton.gif) |
Jak Stoll Performance
![](/tsn/xyz/jakstollbutton.gif) |
M Car Covers
![](/tsn/xyz/mcarcoversbutton.gif) |
Ad Available
![](/tsn/xyz/buttonavailable.gif) |
![](/tsn/images/tsnmap.gif)
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!