Low boost with my sc - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-07-2007, 04:00 AM   #1
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Aug 2007
Location: Milwaukee, Wisconsin
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
94_SSEi is on a distinguished road
Default Low boost with my sc

From what i have been reading i think my stock boost level should be around 5
Plz correct me if i am wrong
But i am only showing about 2psi
Any suggestions would be helpful
(94 bonneville ssei)
94_SSEi is offline   Reply With Quote
Old 08-07-2007, 05:44 AM   #2
Senior Member
Posts like a Corvette
 
Join Date: Feb 2007
Location: Sanford Michigan
Posts: 1,200
Thanks: 0
Thanked 0 Times in 0 Posts
crash93ssei is on a distinguished road
Default

hmmmm.

I believe that the stock boost should be around 8 - 10 PSI at wide open throttle. I know that on my '93 SSEi, when I floor it, the boost hits around 9 PSI at about 5000 RPM.

If you are showing only approximatly 2 PSI at wide open throttle, I would say that something is wrong for sure. What would be wrong, I myself could only guess at, but I am sure that one our resident gearheads will probably chime in soon in and explain any possible problems.
crash93ssei is offline   Reply With Quote
Old 08-07-2007, 06:36 AM   #3
Senior Member
True Car Nut
 
Join Date: Jan 2003
Location: Bonney Lake/Ellensburg, Washington- WCBF '04, '05, '06, '07 Survivor-
Posts: 7,098
Thanks: 0
Thanked 0 Times in 0 Posts
driverjohn2005 is on a distinguished road
Default

I had a similar issue, it sounds like your Boost Control Actuator might be bad. Could a gearhead verify that?
driverjohn2005 is offline   Reply With Quote
Old 08-07-2007, 06:38 AM   #4
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Aug 2007
Location: Milwaukee, Wisconsin
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
94_SSEi is on a distinguished road
Default

on my way home from work today, my sc started making a lot of unusuall noises
i think i may need to rebuild it, i will see if i can get a video of the sound
94_SSEi is offline   Reply With Quote
Old 08-07-2007, 06:39 AM   #5
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Aug 2007
Location: Milwaukee, Wisconsin
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
94_SSEi is on a distinguished road
Default

i dont get above 0 until im at like 2800rpm
94_SSEi is offline   Reply With Quote
Old 08-07-2007, 06:40 AM   #6
Senior Member
True Car Nut
 
Join Date: Jan 2003
Location: Bonney Lake/Ellensburg, Washington- WCBF '04, '05, '06, '07 Survivor-
Posts: 7,098
Thanks: 0
Thanked 0 Times in 0 Posts
driverjohn2005 is on a distinguished road
Default

noise is not a good sign. have you checked the */c oil lately?
driverjohn2005 is offline   Reply With Quote
Old 08-07-2007, 07:25 AM   #7
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Aug 2007
Location: Milwaukee, Wisconsin
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
94_SSEi is on a distinguished road
Default

i just got the car like 3 days ago, so no
94_SSEi is offline   Reply With Quote
Old 08-07-2007, 08:24 AM   #8
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Please describe the sound.
BillBoost37 is offline   Reply With Quote
Old 08-07-2007, 09:37 AM   #9
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Bad bearings and/or a coupler don't reduce boost. It'* either a vacuum leak at the BCS/BCA, a bad BCA or BCS, or a sticky bypass valve.

We'll start with the sound and go from there. You should be getting 7-8 psi stock on a 94/95.
willwren is offline   Reply With Quote
Old 08-07-2007, 11:28 AM   #10
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

Where are you located? Someone nearby may be able to stop by and take a look.
J Wikoff is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Low boost, no boost problem immusicman Forced Induction 12 09-27-2009 01:05 AM
Boost Control Solenoid Maintenance and Boost Control Actuator Test for low Boost* Toddster Trouble shooting + Test Procedures 0 03-21-2009 07:24 PM
More boost via boost controller... DanCulkin Performance, Brainstorming & Tuning 14 07-02-2007 12:02 PM
low boost, low power, SES.....what happened? mikey Forced Induction 14 11-08-2005 10:58 AM
low stock Boost vs high stock boost hvactech Performance, Brainstorming & Tuning 12 05-10-2005 11:14 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:06 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.