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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Thread: Stg. III Viggen Boost Reply to Thread
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Topic Review (Newest First)
08-18-2008 08:13 PM
chriscam84
Quote:
Originally Posted by 99VIG View Post
I think NahumCC touched on this issue where you can "set your boost gauge where ever you want," The service manual says, that, when you have your key in the "ON" position (NOT RUNNING), The boost gauge should read right in the middle of white and yellow. That is the "Atmosphere" reading. if it is either a little above (yellow) or below (white) then the TechII is reqiured to re-calibrate the gauge. I hope that helps you 'cause otherwise you could be chasing a ghost for a long time.
mmmm, definitely not Boosting, I'd be able to feel it.

Then I checked the boost gauge with the engine off, definitely not that either.

SO confused
08-16-2008 10:15 AM
99VIG I think NahumCC touched on this issue where you can "set your boost gauge where ever you want," The service manual says, that, when you have your key in the "ON" position (NOT RUNNING), The boost gauge should read right in the middle of white and yellow. That is the "Atmosphere" reading. if it is either a little above (yellow) or below (white) then the TechII is reqiured to re-calibrate the gauge. I hope that helps you 'cause otherwise you could be chasing a ghost for a long time.
08-09-2008 05:23 AM
lms Have you pressurized the system to look for leaks? My viggen ran pretty damn, good (18-21 psi) depending on Temp and such. I found that the plastic pipe connection to the TB leaked in 2 areas; my hyperboost leaked as well. Fixed those and I'm off and running even better now. You want to try this as maybe; just maybe you have a leak that will rear its head at 10 psi and above.
08-08-2008 06:28 PM
SAAB9-3USA
Quote:
Originally Posted by chriscam84 View Post
So, we just tried this.... no result
Yea i have no more ideas on this one
08-08-2008 02:12 PM
chriscam84
Quote:
Originally Posted by chriscam84 View Post
Thanks, I'm gonna go try this right now!
So, we just tried this.... no result
08-08-2008 01:09 PM
chriscam84
Quote:
Originally Posted by Marksy View Post
After searching billions of 9-3 forums, I found my answer in a 9-5 forum. Since the Aero engine and management for the t7 is the same as the Viggen, I looked there. I guess the higher mileage and boosted t7's leak boost air past the evep check valves. Sorry I don't have more info, (and I don't mean to give props to other forums), but check Saabcentral and search "evap". I believe the post is something to do with the boost only going into the yellow on an aero. Character named "Godfather" had the fix. Don't laugh, but it involves a bolt, or a ballpoint pen. That's what I used. My STG 3 viggen now feels like it. : )
Thanks, I'm gonna go try this right now!
08-08-2008 01:02 PM
Marksy After searching billions of 9-3 forums, I found my answer in a 9-5 forum. Since the Aero engine and management for the t7 is the same as the Viggen, I looked there. I guess the higher mileage and boosted t7's leak boost air past the evep check valves. Sorry I don't have more info, (and I don't mean to give props to other forums), but check Saabcentral and search "evap". I believe the post is something to do with the boost only going into the yellow on an aero. Character named "Godfather" had the fix. Don't laugh, but it involves a bolt, or a ballpoint pen. That's what I used. My STG 3 viggen now feels like it. : )
08-01-2008 08:27 PM
Legit Yeah thats probably why
08-01-2008 08:20 PM
01Saab93 I keep backing it down.... i think its cause of the piece of the bpc i broke off on accident... ill buy a new one soon. i have it set to about 14 psi. it was 15 psi before i put it on.. hmm i donno.
08-01-2008 08:16 PM
Legit
Quote:
Originally Posted by 01Saab93 View Post
Well if they changed the boost gauge base to read different then yea would read what you want. Me i have the 01 93 SE with the SMBC and it will boost past red if i want but it also trips into limp home mode aswell every now and then. all i do is turn key off let engine die wait about 3 seconds and im good it will kick out of limp mode and run fine. Is it a t-7???
You have it set too high, its called fuel cut. Back it down a little
08-01-2008 08:13 PM
01Saab93 Well if they changed the boost gauge base to read different then yea would read what you want. Me i have the 01 93 SE with the SMBC and it will boost past red if i want but it also trips into limp home mode aswell every now and then. all i do is turn key off let engine die wait about 3 seconds and im good it will kick out of limp mode and run fine. Is it a t-7???
08-01-2008 06:03 PM
stevehayes01 This is essentially what you get when you put one on........ most parts stores carry them.....


08-01-2008 01:27 PM
chriscam84
Quote:
Originally Posted by stevehayes01 View Post
I am guessing he has an after market downpipe and the code you get is a P0331 or something similar. The 2nd O2 sensor code can be fixed with an anti fouler put in the bung on the DP and then put the O2 sensor in. This will keep it far enough out of the exhaust trail to not trip the sensor off.
Yup, 3" aftermarket DP.

That makes perfect sense Steve, now tell me more about this anti-fouler.
08-01-2008 10:23 AM
stevehayes01 I am guessing he has an after market downpipe and the code you get is a P0331 or something similar. The 2nd O2 sensor code can be fixed with an anti fouler put in the bung on the DP and then put the O2 sensor in. This will keep it far enough out of the exhaust trail to not trip the sensor off.
08-01-2008 10:02 AM
chriscam84
Quote:
Originally Posted by stevehayes01 View Post
I know on my OG9-3 SE HOT AUtomagic I boosted on a stock gauge with stock S/W right into a sliver of red.


You have to remember that the stock boost gauge is only a vague guide and is speculative at best.


Have you checked your throttle body to ensure that its not in LIMP HOME MODE?? Also you may want to check your wastegate to ensure its functioning right as well as your Recirculation Valve.
Replaced the BPV and checked the LHM when he first got it, I'll check it again though.

Quote:
Originally Posted by SAAB9-3USA View Post
I say check the TB
^^^^

Quote:
Originally Posted by lms View Post
What stage 3 SW do you have? Have you put stock ecu back in as a test or does the stock ecu have the new files? How does it run overall?
Go down to partse stor and pick up a cheap presssure gauge for 10 bucks and route it through window to test psi. What octane? How old is dic? Does cel work?
Its Nordic stage III, DI is brand new (thanks to me letting him use my spare). He uses 91-93 octane exclusively (getting harder and harder to find 93 around here). CEL works and sometimes comes on after a few hundred miles, pulled the code and it points to the 2nd o2 sensor.

Quote:
Originally Posted by NahumCC View Post
Your both partially right and wrong.

That stock dash gauge on the ng900/og9-3 is computer controlled and can be set to show whatever range you want by a Tech II. So you could have all the way to the end of the red as 5psi if you really wanted to.

However if both dash gauge settings were not changed then yes this could be relevant in comparison regardless of the T5 vs. T7 and show something isn't right with this viggen which is pretty obvious.

Check the plugs, MAF, DI, BPC, vacuum lines, and the wastegate actuator as well as were the base boost is set.
Checked all of the above, will check the base boost readings next time he's down.

-Chris (the resident Viggen mechanic)
08-01-2008 08:30 AM
dan-the-kid
Quote:
Originally Posted by NahumCC View Post
That stock dash gauge on the ng900/og9-3 is computer controlled and can be set to show whatever range you want by a Tech II. So you could have all the way to the end of the red as 5psi if you really wanted to.
X2 After putting in the TD04 in my brothers NG, while boosting to about 18PSI the needle has flown past the end of the red on the gauge.
08-01-2008 08:27 AM
NahumCC
Quote:
Originally Posted by LeGiT SaaB View Post
My buddy's stage 3 ng900 boosted to the end of red. Not sure if that is relevant.
Quote:
Originally Posted by Jameson View Post
It's not. It's a T5 car compared T7.
Your both partially right and wrong.

That stock dash gauge on the ng900/og9-3 is computer controlled and can be set to show whatever range you want by a Tech II. So you could have all the way to the end of the red as 5psi if you really wanted to.

However if both dash gauge settings were not changed then yes this could be relevant in comparison regardless of the T5 vs. T7 and show something isn't right with this viggen which is pretty obvious.

Check the plugs, MAF, DI, BPC, vacuum lines, and the wastegate actuator as well as were the base boost is set.



08-01-2008 08:25 AM
lms What stage 3 SW do you have? Have you put stock ecu back in as a test or does the stock ecu have the new files? How does it run overall?
Go down to partse stor and pick up a cheap presssure gauge for 10 bucks and route it through window to test psi. What octane? How old is dic? Does cel work?
08-01-2008 07:52 AM
SAAB9-3USA I say check the TB
07-31-2008 11:27 PM
stevehayes01 I know on my OG9-3 SE HOT AUtomagic I boosted on a stock gauge with stock S/W right into a sliver of red.


You have to remember that the stock boost gauge is only a vague guide and is speculative at best.


Have you checked your throttle body to ensure that its not in LIMP HOME MODE?? Also you may want to check your wastegate to ensure its functioning right as well as your Recirculation Valve.
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