Stock Boost Levels - SaabCentral Forums
* site search:  
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum

Go Back   SaabCentral Forums > Saab NG900, 1994-1998 and OG9-3, 1999-2002 & '03 Convertible > Saab NG900 & OG9-3 Performance, Mods & Tuning
Saab NG900 & OG9-3 Performance, Mods & Tuning Covers Tuning & Performance modifications for the Saab NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 5th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default Stock Boost Levels

Hi. Yesterday I put in a boost gauge awaiting my MBC. Every since I got my car (4 months ago) it hasn't boosted all the way. It won't quite go through the yellow. My mechanic took a look at it, and he thought that once it got "used" to premium gas it would boost right. After about 7 tanks through it, nothing's changed. Now with my boost gauge on, it's only making about 7psi. Also, It doesn't seem to boost any less in 1st or 2nd than the rest of the gears. My question is, should I just tune the MBC to run what I want (I'm thinking about 13psi) or do I need to have it looked at to see why it's not boosting right with the ECU controlling boost? Thanks
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 5th March 2005
Stalker's Avatar
Stalker Stalker is offline
Saab Crazy
 
Join Date: Feb 2004                                                
Location: Birmingham, AL
My Saabs: 2004 MSM #3990 Ex:1999 9-3 SE
Posts: 919
Default

Well, not quite thru the yellow sounds pretty norm to me... (although the 7psi reding does sound low) Id say just throw it on there (mbc that is). You do have an intake right? And of course get gap your plugs, premium gas, and good synth oil for the mbc use.

Im afraid im gonna have to see a pic of the gauge install there...
__________________
Generally speaking, you dont need any extra incentive to murder a dry cleaner.
Reply With Quote Quick reply to this message
  #3  
Old 5th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default

Well I guess I described it wrong, it barely goes above HALF of yellow, obviously low (my mom and dad both have saab turbos and they go right up to the end of yellow). I do use premium gas, I need to change the oil soon, and i'll put in synthetic. However, for the plugs, I need to get them gapped? What would be the advantage of new plugs? Here's some pics of the gauge, it looks really cool especially with the red light. Sorry the pics are so crappy, I never get around to taking pics in the daylight.
Reply With Quote Quick reply to this message
  #4  
Old 5th March 2005
Stalker's Avatar
Stalker Stalker is offline
Saab Crazy
 
Join Date: Feb 2004                                                
Location: Birmingham, AL
My Saabs: 2004 MSM #3990 Ex:1999 9-3 SE
Posts: 919
Default

Yea you should get some new plugs. w/o the right plugs and correct gap, you can lose some power. The plugs are BCPR-7ES availible at advanced on a next day delivery basis. They should be gapped to .035" (they also carry the gapping tools) It does sound like it is underboosting a little, but since its not a huge amount i wouldnt worry, maybe just a bpc problem (which youre about to bypass anyway )

Gauge looks good. What model and make is it? Couldnt tell from the pic...

Stalker
__________________
Generally speaking, you dont need any extra incentive to murder a dry cleaner.
Reply With Quote Quick reply to this message
  #5  
Old 5th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default

It's an autometer. How bout aftermarket plugs, any suggestions, is it worth it?


http://store.summitracing.com/defaul...=egnsearch.asp
Reply With Quote Quick reply to this message
  #6  
Old 5th March 2005
mg_td's Avatar
mg_td mg_td is offline
Saab Lunatic
 
Join Date: Dec 2004                                                
Location: Auburn, ME
My Saabs: 00 Viggen
Posts: 1,327
Default

aftermarket plugs? umm, i believe you only want some ngk bcpr7es-11
Reply With Quote Quick reply to this message
  #7  
Old 5th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default

would these be worth the extra money? (do they cost more) Or should I just go with the stock plugs because my engine isn't modified that much (only a cat back exhaust)
Reply With Quote Quick reply to this message
  #8  
Old 5th March 2005
mg_td's Avatar
mg_td mg_td is offline
Saab Lunatic
 
Join Date: Dec 2004                                                
Location: Auburn, ME
My Saabs: 00 Viggen
Posts: 1,327
Default

they cost me 2.35 each. they are the preferred, and stock plug. we need special plugs because of the way the ignition crap works, they serve as a knock detector too, someone else can explain better. but those are the kind you NEED to run right
Reply With Quote Quick reply to this message
  #9  
Old 5th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default

would these be worth the extra money? (do they cost more) Or should I just go with the stock plugs because my engine isn't modified that much (only a cat back exhaust)
Reply With Quote Quick reply to this message
  #10  
Old 5th March 2005
mg_td's Avatar
mg_td mg_td is offline
Saab Lunatic
 
Join Date: Dec 2004                                                
Location: Auburn, ME
My Saabs: 00 Viggen
Posts: 1,327
Default

does a double post warrant double replies? haha, kidding... but yah bcpr7es-11 gapped to .035"
Reply With Quote Quick reply to this message
  #11  
Old 5th March 2005
redline514 redline514 is offline
Saab Lunatic
 
Join Date: Jan 2005                                                
Location: Maine
Posts: 1,059
Default

I don't want to discredit your boost gauge instal, but maybe you are loosing just a little bit of air somewhere? And factory "boost gauges" are known to be inconsistent. Trust me, mine will stay the same even when my boost gauge (calibrated) goes up and down.

If you can somehow take a bike tire or basketball or something, read the psi with a proper hand-help gauge. Then compare this reading to your boost gauge. That is if you can figure out how to hook your boost gauge to the bike tire/basketball.

Otherwise, I would say maybe the factory bpc, so you won't have to worry about that for long. But I know this isn't good if there is another problem, because you would then just be ignoring it.
Reply With Quote Quick reply to this message
  #12  
Old 6th March 2005
Adrian W Adrian W is offline
Saab Crazy
 
Join Date: Sep 2004                                                
Location: Southern California
Posts: 804
Default

Redline, do you have a T7 car? On a T7 car the "boost gauge" is more like an "air-mass/combustion" gauge. If the intake temps are hot the factory gauge will read the same, but an aftermarket boost gauge will read higher. The opposite is true when intake temps are quite low.
Reply With Quote Quick reply to this message
  #13  
Old 6th March 2005
redline514 redline514 is offline
Saab Lunatic
 
Join Date: Jan 2005                                                
Location: Maine
Posts: 1,059
Default

I've got a gauge installed on both a T5 and a T7 car.
Reply With Quote Quick reply to this message
  #14  
Old 6th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default

I suppose it's possible my lines aren't all air tight. I used teflon tape on all threads and cranked them down as far as i could...so I don't know. It's always seemed a little low though, my dads car (900 vert) seems to have a little more go with it boosting where it should. What should my psi be?
Reply With Quote Quick reply to this message
  #15  
Old 6th March 2005
Stalker's Avatar
Stalker Stalker is offline
Saab Crazy
 
Join Date: Feb 2004                                                
Location: Birmingham, AL
My Saabs: 2004 MSM #3990 Ex:1999 9-3 SE
Posts: 919
Default

Did you use some airtite tape or whatever the heck its called when u made the boost tap t? Try that, how does it vaccum at idle? If theres a leak it will show on the vaccum as well. Should be around 15-20 mmHg (-).
__________________
Generally speaking, you dont need any extra incentive to murder a dry cleaner.
Reply With Quote Quick reply to this message
  #16  
Old 6th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default

It idles at about 11, and when i'm driving if i let of the gas quickly, it drops to about 20.
Reply With Quote Quick reply to this message
  #17  
Old 6th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default

but my gauge's vacuum is measured in in hg, not mm hg
Reply With Quote Quick reply to this message
  #18  
Old 6th March 2005
Stalker's Avatar
Stalker Stalker is offline
Saab Crazy
 
Join Date: Feb 2004                                                
Location: Birmingham, AL
My Saabs: 2004 MSM #3990 Ex:1999 9-3 SE
Posts: 919
Default

Sorry, i really meant inHG.... Was thinkin with my science stuff the whole mmHG. 11 inHG sounds a little low (like 13 or so would be more normal) There might be a leak in the tap somewhere.
__________________
Generally speaking, you dont need any extra incentive to murder a dry cleaner.
Reply With Quote Quick reply to this message
  #19  
Old 6th March 2005
Marks900SE's Avatar
Marks900SE Marks900SE is offline
Saab Lunatic
 
Join Date: Oct 2003                                                
Location: Arlington, VA
My Saabs: '99 9-3
Posts: 1,816
Default

Mine used to idle over 20in/HG now its just over 18. I though that was normal.

Exact psi for stock car is 7/8psi in 1st and 2nd then 10/11psi in 3rd through 5th.
__________________
'96 900SE Turbo Stage 4 - RIP
'97 900SE Turbo - Gone
'98 900SE Turbo - Gone
'99 9-3 S - Underway
Reply With Quote Quick reply to this message
  #20  
Old 6th March 2005
96Turbo 96Turbo is offline
Senior Member
 
Join Date: Jan 2005                                                
Location: Minnezona
My Saabs: T5 Turbos
Posts: 211
Default

correction, i was reading my gauge wrong. It actually idles at about 15 inhg. The dots are by 2s, not 1s. (Duh!)
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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 08:39 PM.



Powered by vBulletin® Copyright ©2000 - 2014, 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.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.