Re: Thanks Dean, some more details ... (longish) - Saab Performance Bulletin Board - Saabnet.com
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 Performance Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Thanks Dean, some more details ... (longish)
Posted by Dean (more from Dean) on Tue, 23 Oct 2001 11:43:37
In Reply to: Thanks Dean, some more details ... (longish), Josh, Tue, 23 Oct 2001 10:31:53
Members do not see ads below this line. - Help Keep This Site Online - Signup
The Saab T5 ecu's control boost pressure and do not have air mass meters. They can have the boost taken up to near 1 bar with a MBC. Pressures that are too high cause the ecu to cut off fuel by not triggering the injectors. This is a hard abrupt fuel cut.
the Saab T7 ecu's control charge air density, computed with temperature and pressure. They have air mass meters. The throttle bodies are drive by wire, and will close the throttle in response to over boosting. This provides a soft fuel cut. So T7 MBC applications cannot create large increases in power, but can improve spool up and I beleive power in the 1st two gears.
There are some mods that also help, K&N, air box, exhuast and a couple of DIYs to remove flow restrictions.
I think that the two sensors before and after the cat are O2 sensors, not temperature sensors.
On the Saabs, the monfold pressure goes to an absolute pressure sensor which the feeds its signal to the ECU, the ECU controls the boost solenoid valve. The solenoid valve gets pressure from the compressor housing, (not the manifold). That pressure is simply a source of pressure and is not a control point.
The two way activated bypass valve is an interesting feature to remove the turbine flow resistance while on cruise, but that does nothing to dump the combustion air pressure...
posted by 208.24.17...
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!