Okay, so Chriscam84 and I have posted multiple times about my 99 Viggen's obvious boosting issue. Since I don't currently have a "real" boost gauge, I can only say that it only boosts about halfway into the yellow, but never into the red.
Is there anything anyone can think of as to what it may be so I can just make a giant list and check everything imaginable. I am correct in assuming that a Stg 3 should be boosting fully into the red? Since I've never actually ridden in any other tuned Viggen, I have nothing to compare too.
Right now I can hold my own against Chriscam84's 9-5 Aero (Though he'll neeever admit to it) but should I be going faster still? Any help, ideas, recommendations would be greatly appreciated. Thanks everyone!
yea i agree. with stock software mine only boosted to near the end of the yellow. i have nordic stg 3 now and depending on temperature it will boost a little bit into the red at most. the middle of yellow seems a bit low for stg 3, you should pobably get a boost gauge if you can for a more accurate reading.
heres some things to check:
i would first try resetting the ecu and readapt it
check all vacuum lines and charge lines including the ic
check your sparkplugs
check boost control valve
check wastegate actuator
check bypass valve
check maf
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.
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.
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.
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.
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?
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.
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???
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.
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. : )
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.
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
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Saab Link Forums
953K posts
26.9K members
Since 2003
A forum community dedicated to Saab owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!