Low Turbo Boost - Mid Yellow Only - SaabCentral Forums
*
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum


Go Back   SaabCentral Forums > Saab 9-5 Mk.I, 1998-2009 > 9-5 Performance, Mods & Tuning

Notices

9-5 Performance, Mods & Tuning Covers Tuning & Performance modifications for the 9-5

SaabCentral.com is the premier Saab All Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 23rd July 2007
shayreddy shayreddy is offline
Active Member
 
Join Date: Jun 2005                                                
Location: Columbus
My Saabs: SAAB 00 95 Aero
Posts: 40
Default Low Turbo Boost - Mid Yellow Only

OK - fellow saabers I am going crazy ... Can anyone tell me what a 2000 95 aero, no sludge, well maintained car should feel like - The only mod is a k n n filter , closed.

Eveyrone at the traffic light zips by me..? This car is way slower than my 330 i.. Off the line I expected that, but even in 3/4/5 gears? I though this car could take a Porsche???

Anyway I dont think I am getting full boost.the saab gurus dont know what it is... the stealership told me its fine.. But Ther eis no way in hell this car can be boosting fully. I pulled off one the line and drove it ..and for the first time I felt TURBO in this saab. ...

Dumpvalve,apc, vaccum everything checks out fine ... still it has sluggish performance ... No one seems to know whats wrong with this car..

HELP HELP HELP
__________________
Shay Reddy
2000 Saab 95 Aero
Mods - KnN Filter

Last edited by shayreddy; 23rd July 2007 at 03:58 PM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Have you read the three other current low boost threads?



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....
Reply With Quote Quick reply to this message
  #3  
Old 23rd July 2007
shayreddy shayreddy is offline
Active Member
 
Join Date: Jun 2005                                                
Location: Columbus
My Saabs: SAAB 00 95 Aero
Posts: 40
Default

Quote:
Originally Posted by Chris 9-5
Have you read the three other current low boost threads?

Yes I have but it seems like there is no one with the same issue. On my car everyhting checks out OK. Just cant identify the problem. I have been reading 1000s of posts ... on many websites... about to give up on this car.
__________________
Shay Reddy
2000 Saab 95 Aero
Mods - KnN Filter

Last edited by shayreddy; 23rd July 2007 at 03:59 PM.
Reply With Quote Quick reply to this message
 
  #4  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

You said the guages dropped and the ACC went off didnt you?

If you are convinced its power/boost related what have you checked / swapped out?



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....
Reply With Quote Quick reply to this message
  #5  
Old 23rd July 2007
shayreddy shayreddy is offline
Active Member
 
Join Date: Jun 2005                                                
Location: Columbus
My Saabs: SAAB 00 95 Aero
Posts: 40
Default

Tommy Turbo of Columbus checked it out and is helping me with it ..told me I am primarly getting engine poweer only and hardley any boost..

So he sawpped some partss with his car which is boosting well... and we did some swap and install tests.

BOV/Bosch valve,
APC solenoid (one with three hoses on it..right?)
Pressure switch

All three were swapped and tested with no improvement of any sorts. All three worked fine on the donor car as well.

Now on using the tech 2 the valve near the firewall clicked .. so that was the test to ensure it was working.

ALso when one pipe was detached from the turbo (wastegate pipe - i belive) The turbo boosted all the wy intothe red and for the first time I felt SAAB POWER.

So I dont know what the issue is, It also doest seem to hold boost pressure
I am thinking of installing a boost gauge so I can monitor more closely.

Dealer checked it out and said ... the fllowing ..
ENGINE had 60KPA boost and tourque output at 280 Nm peak output (Isntaht that low for an aero? I think he gave me a stadrad 2.3T valuethere...)

AARG H... I dont know if this car is fast or slow What shold a 95 aero really feel like ? ..!!!! (230 hp)
__________________
Shay Reddy
2000 Saab 95 Aero
Mods - KnN Filter
Reply With Quote Quick reply to this message
  #6  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Enough air mass? Check swap AMM?

Spark and DI - check / swap?

Check base boost?

Quote:
Originally Posted by shayreddy

AARG H... I dont know if this car is fast or slow What shold a 95 aero really feel like ? ..!!!! (230 hp)
Dunno sorry, I have the weedy 2.0



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....
Reply With Quote Quick reply to this message
  #7  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Ok here is one to try!

The Boost control valve has three pipes coming off it!

Remove the top one, and plug the pipe with a bolt.

Try the car now............



It could be a bad fuel evap system valve





Quote:
Originally Posted by SectorNine50
Okay I figure I'm going to explain, in detail, how this system works and why it causes boost problems. I even have a pretty picture!



Alright, so as you can see I've circled the check valves that fail. These one-way valves make it so that the vacuum from the throttlebody at lower power levels pulling air from the intake cobra. It also keeps pressurized air from the throttle body from escaping and going back before the turbo since the cobra is at negative pressure from the turbo sucking in air at a rapid rate at high power scenarios. Having the check valves set-up the way they are allows the EVAP system to purge when the engine is vacuuming or boosting.

Anyway, what happens is when the top check valve fails, it allows the charged air from the throttle body (when turbo is boosting) to flow the wrong way through the EVAP purge system's tubes. This pressure flows down through the lower check valve (doesn't matter whether it's good or bad) and runs into the intake cobra and to our boost control valve through that "T." That pressure then pushes open a switch inside the BCV that is meant to resist vacuum (or pressure from inside the BCV) and is controlled by the ECU. After that pressure runs into our BCV and out through the wastegate nipple (combining with another charged air vacuum line which is the bottom nipple) and causes the wastegate to open prematurely.

When the wastegate opens, exhaust gasses bypass the hot-side turbine inside the turbo and in return, the turbo slows down. Because it is opened prematurely, the turbo never has a chance to create full boost, and the turbo gauge reflects that.

My guess is that the reason the top one-way valve fails is because it is under a lot of pressure under WOT, and then straight to vacuum when off the throttle. This is constantly happening even in normal driving conditions. The bottom one-way valve probably lasts much longer because it never sees nearly the same amount of pressure either way.

It is perfectly okay to run the car without replacing that top check valve as the purge system will still operate correctly with one correctly operating valve. However, there is probably minimal performance loss as the pressure inside the throttle body will always be bleeding back into the intake cobra. However, on a stock tune the turbo will be able to compensate for the minor loss. People with aftermarket tunes may like to replace the valves because as we all know, any little bit of boost helps in the higher RPMs when the TD-04 can't hold 21 psi.

If there are any inaccuracies, please post. Hope this helps you guys understand what's going on with this "fix."


__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....

Last edited by Chris 9-5; 26th May 2008 at 03:07 PM.
Reply With Quote Quick reply to this message
  #8  
Old 23rd July 2007
shayreddy shayreddy is offline
Active Member
 
Join Date: Jun 2005                                                
Location: Columbus
My Saabs: SAAB 00 95 Aero
Posts: 40
Default

Yeah ... I am going to check DI and see if the plugs are burnt - they were replace aboubt 10K miles ago....and so was the DI from the dealer .

ALs - can it be that there is a leak near the MAF ??

MAF is the only thing that I really didnt check , or it could be an exhaust issue. THe car feels somewhat strained - like a caged tiger... I also never hear any of the cool sounds these people are talking about . I dont have a forge BOV, all I cna hear is some sucking of the KnN filter thats all ..

Anyway ....how do yo ucheck the MAF ? I am assuming that what the AMM is right ?
__________________
Shay Reddy
2000 Saab 95 Aero
Mods - KnN Filter
Reply With Quote Quick reply to this message
  #9  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Quote:
Originally Posted by shayreddy

Anyway ....how do yo ucheck the MAF ? I am assuming that what the AMM is right ?
Tech 2 can check your MAF readings! A leak would give a check engine light on the dash!

Try the pipe thing I just posted



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....
Reply With Quote Quick reply to this message
  #10  
Old 23rd July 2007
shayreddy shayreddy is offline
Active Member
 
Join Date: Jun 2005                                                
Location: Columbus
My Saabs: SAAB 00 95 Aero
Posts: 40
Default

OK GONNA GO TRY NOW .. be back in a BIT
__________________
Shay Reddy
2000 Saab 95 Aero
Mods - KnN Filter
Reply With Quote Quick reply to this message
  #11  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Leave the pipe on the valve open but block the pipe you take off!



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....
Reply With Quote Quick reply to this message
  #12  
Old 23rd July 2007
shayreddy shayreddy is offline
Active Member
 
Join Date: Jun 2005                                                
Location: Columbus
My Saabs: SAAB 00 95 Aero
Posts: 40
Default

SIR SAAB ,

YOU ARE THE GREATEST !!!!! THANK YOU - I FELT TORQUE STEER FOR THE FIRST TIME.I LOVE THIS CAR NOW !!! FINALLY .... I cnat wait to let her RIP ON THE HIGHWAY THIS AFTERNOON ..

I STUCK A PEN INSTEAD OF A BOLT CAUSE THATS ALL I CAN FIND... IHOPE THE INK DOENST GET SUCKED OUTOF HTE PEN INTO THE TURBO ...

SO WHAT' S STEP 2 TO MKAE THIS PERMANENT..... ???
__________________
Shay Reddy
2000 Saab 95 Aero
Mods - KnN Filter
Reply With Quote Quick reply to this message
  #13  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Ha!

I just need to stand up and dance around my PC

Yep thread a bolt into the end, like in my pic and zip tie it away!



Then forget all about it, mine just fine at 350+ bhp

Summit to do with the carbon filter evap canister on the fuel system thingy - you had not much more than base boost only



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....

Last edited by Chris 9-5; 23rd July 2007 at 04:54 PM.
Reply With Quote Quick reply to this message
  #14  
Old 23rd July 2007
shayreddy shayreddy is offline
Active Member
 
Join Date: Jun 2005                                                
Location: Columbus
My Saabs: SAAB 00 95 Aero
Posts: 40
Default

SO what does this mean ?
__________________
Shay Reddy
2000 Saab 95 Aero
Mods - KnN Filter
Reply With Quote Quick reply to this message
  #15  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Quote:
Originally Posted by shayreddy
SO what does this mean ?
It means you fixed it - go drive the thing fella

Summit to do with the carbon filter evap canister on the fuel system thingy - you had not much more than base boost only - just block it and forget it



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....
Reply With Quote Quick reply to this message
  #16  
Old 23rd July 2007
fusionrx fusionrx is offline
Saab Lunatic
 
Join Date: Jun 2007                                                
Location: Wisconsin, USA
My Saabs: 07 Honda Odyssey no saabs
Posts: 1,793
Default Where's the evap purge valve?

Since you have such nice pics of the engine bay, where is the Evap Purge Valve, I am having issues with mine and need to clean/hammer it to get it working again... Eventually I will replace it...
Reply With Quote Quick reply to this message
  #17  
Old 23rd July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Quote:
Originally Posted by fusionrx
Since you have such nice pics of the engine bay, where is the Evap Purge Valve, I am having issues with mine and need to clean/hammer it to get it working again... Eventually I will replace it...
No idea

Sorry.........



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....
Reply With Quote Quick reply to this message
  #18  
Old 23rd July 2007
fusionrx fusionrx is offline
Saab Lunatic
 
Join Date: Jun 2007                                                
Location: Wisconsin, USA
My Saabs: 07 Honda Odyssey no saabs
Posts: 1,793
Default

I gather it may also be known as the charcoal canister...


Got a 0455 error code, replaced gas cap so other option short of hoses is the evap purge valve (charcoal canister). Other folks on TSN said a shot of Carb cleaner in the purge valve/charcoal canister will help isolate if this is the culprit...
Reply With Quote Quick reply to this message
  #19  
Old 24th July 2007
Chris 9-5's Avatar
Chris 9-5 Chris 9-5 is offline
Saab Sage!
 
Join Date: Jun 2003                                                
Location: SaabWorld
My Saabs: .
Posts: 22,211
Default

Its inside the inner wheel arch cover on the driver side (UK) of the car



__________________
I decline to grant to SAABCENTRAL.COM a non exclusive, royalty free, worldwide, perpetual license to reproduce, distribute, transmit, sublicense, create derivative works of, publicly display, publish and perform any materials and other information I submit to any public areas....
Reply With Quote Quick reply to this message
  #20  
Old 24th July 2007
Al's Red Wagon's Avatar
Al's Red Wagon Al's Red Wagon is offline
Saab Lunatic
 
Join Date: Apr 2007                                                
Location: Newburgh, NY, USA
My Saabs: 1999, Cayenne Red 9-5, 2.3 Wagon
Posts: 2,846
Exclamation Hmm...

This looks incredibly interesting...

1.) Is this something just moded cars should look into, or should we all try this?

2.) Any pictures of just a regular engine bay doing this? The difference between Chris's and other engine bay's is like the difference between Angelina Jolie and most other women...

3.) You think state inspections with enviro evap tests will care about this?

Thanks
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:25 PM.



Powered by vBulletin® Copyright ©2000 - 2019, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.