Saab 9000 Build - Boot Cut Issue - Help Please

A place for long term threads surrounding a specific project or SAAB build for motorsports or restoration
TurboBudapest
Posts: 59
Joined: Thu Jan 23, 2014 6:31 am
Nickname: Ed
Number of Saabs currently owned: 3

Saab 9000 Build - Boot Cut Issue - Help Please

Postby TurboBudapest » Mon Jul 25, 2016 2:28 am

Not sure if I am posting this in the right place...I have a 1997 Saab 9000 Aero. This car has been extensively rebuilt and modified over the last several years, and last year received a Maptun stage 3 chip upgrade. I have had a the car for four years now and have always had boost cut issues - even before I had it chip tuned. This summer we decided to put the T7 boost control valve in it and have the ECU modified to allow for the T7 BCV's use. The T5 boost control valve is notoriously unreiable. Still am having boost cut issues and am getting very frustrated. My tuner already sent back one ECU and still having the issue (throwing a lot of money at it).

We put a manual boost guage on it, and it is clear that the car is not boosting past 1.5 bars, so not sure why this is happening. Even more wierd is that the boost spikes to 1.5 bars then goes back down to 1.0 bar pretty much right away. I know that the boost spike was pretty standard from factory, but my Saab tuner says that this is a bigger decrease than usual. My family have owned a variety of 9000s through the years (including an Aero), and I feel that the highway acceleration is not what it would have been even with factory standard tuning.

Any ideas as to what the issue could be? I even put in a new factory blow off valve last year with no effect.

One thing I was thinking is installing an electronic boost control system. Has anyone ever done one of these conversions?

Many thanks in advance!

Ed

User avatar
Krizzie
Posts: 87
Joined: Thu Feb 11, 2016 10:19 am
Nickname: Kris
Number of Saabs currently owned: 1
Location: Netherlands

Re: Saab 9000 Build - Boot Cut Issue - Help Please

Postby Krizzie » Mon Jul 25, 2016 3:01 am

You need a 3+ bar mapsensor in order to go past 1.5bar of boost..
My ride: MY91 Saab 900 Aero T5.5 Converted, 9000 Aero interior, Xenon projectors and many more mods/upgrades

User avatar
99Super
Posts: 1061
Joined: Wed Jan 24, 2007 5:14 pm
Number of Saabs currently owned: 13
Location: Boise, ID
Contact:

Re: Saab 9000 Build - Boot Cut Issue - Help Please

Postby 99Super » Mon Jul 25, 2016 11:45 am

I agree w/ Krizzie about the 3 bar MAP sensor.
Also, there is also a parameter in T5 that limits boost to 1.5 bar max that is outside of the standard boost control.
Perhaps that parameter wasn't changed?

John
_______________________________________________
"I don't want no Commies in my car!... No Christians either!"

User avatar
Jordan
Site Admin
Posts: 4068
Joined: Fri Oct 13, 2006 2:38 pm
Number of Saabs currently owned: 6
Location: Vernon, CT
Contact:

Re: Saab 9000 Build - Boot Cut Issue - Help Please

Postby Jordan » Tue Jul 26, 2016 4:57 am

If you have a copy of the bin file or could get me the ecu I'd be happy to look at it. without that it could really be a lot of things. The biggest contributor I see to boost control problems is improper base-boost settings and too high initial boost requests.


Return to “Projects and Build Threads”

Who is online

Users browsing this forum: No registered users and 1 guest