Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: Boost gauge readings...?!

  
  1. #1
    Status
    Offline
    RobW's Avatar
    AOC Obsessed
    Join Date
    Jan 2005
    Posts
    3,411
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)

    Boost gauge readings...?!

    Just got mine fitted and it (please pardon my ignorance with these...) is a smoke autogauge which has a range of 30 to 0 to 30. Get what i mean?!

    At idle, its sitting at -20? Then on a good revving it goes to 0 then out and about driving it peaks at 9 and settles at about 7. I know the peaking is overboost but should it read so low on idle? Its all connected up right and tight.

  2. #2
    Status
    Offline
    d dave's Avatar
    AOC Obsessed
    Join Date
    May 2003
    Location
    Edinburgh
    Posts
    11,579
    Mentioned in
    0 Post(s)
    Quoted
    5 Post(s)
    Add d dave on Facebook
    on idle mines sits on -0.5 so its working fine.
    Scottish Member? Have a peep at our Region For tints or wraps Click Here!!

  3. #3
    Status
    Offline
    RobW's Avatar
    AOC Obsessed
    Join Date
    Jan 2005
    Posts
    3,411
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    So, pardoning my ignorance again (!) but why is it a negative on idle? surely it would be 0?

    Mine is on psi, I assume yours is on bar, Dave?

  4. #4
    Status
    Offline
    jamesmurray's Avatar
    AOC Fanatic
    Join Date
    Sep 2005
    Posts
    590
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    at idle and part throttle the engine is still operating under a vacuum. only when the turbo is boosting will the pressure go over 0 on the gauge.
    ASTRA MK4 GSI TURBO
    WAS CS3 268bhp & 282lb/ft
    NOW CS4 279bhp & 336lb/ft

  5. #5
    Status
    Offline
    paul_bunce's Avatar
    AOC Obsessed
    Join Date
    Jul 2005
    Location
    Downham Market
    Posts
    1,936
    Mentioned in
    24 Post(s)
    Quoted
    17 Post(s)
    When you car idle the throttle valve (butterfly) is almost closed, the turbo is not spinning due to lack of exhaust yet the engine is trying to draw in air. So -20 is about right. You will get 0 at full throttle until the turbo spins up and builds pressure.
    Astra H SRi 1.9 CDTI
    WG Motorworks stage 1.5 Remap, VXR suspension, Whiteline RARB, Courtenay brake hoses, VXR brakes,
    OP COM East Anglia Region

  6. #6
    Status
    Offline
    RobW's Avatar
    AOC Obsessed
    Join Date
    Jan 2005
    Posts
    3,411
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Ah. I know some basics but am learning all the time!

    So, does that men I have too much of a vacuum or is there no such thing?

  7. #7
    Status
    Offline
    Scottyboy's Avatar
    AOC Obsessed
    Join Date
    Jun 2004
    Posts
    5,750
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    Your readings are fine for a std car at idle. Although under boost it should really be peaking at around 11 and maintaining 9psi.

  8. #8
    Status
    Offline
    trickyb's Avatar
    AOC Fanatic
    Join Date
    Aug 2005
    Posts
    954
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    I had the full set of these fitted up till last month, i changed them as the boost gauge is really optimistic and gives some mad readings. I now use Autometer gauges as these are propperly callibrated and can be re-callibrated.

  9. #9
    Status
    Offline
    d9vmb's Avatar
    AOC Fanatic
    Join Date
    Jan 2006
    Posts
    542
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    mine reads about -20 when im on idle, so yours sounds fine
    Arden Blue GSI (Now gone)
    White Scooby WRX STI (Now stolen)

  10. #10
    Status
    Offline
    LordNikon's Avatar
    AOC Gold Member
    Join Date
    Jun 2003
    Posts
    18,952
    Mentioned in
    0 Post(s)
    Quoted
    0 Post(s)
    All of this is available under the search function. See my sig for a link.

Page 1 of 2 12 LastLast

Similar Threads

  1. Boost gauge readings
    By jreedy in forum Turbo Petrol Engines inc. Transmissions
    Replies: 19
    Last Post: 01-02-2013, 19:56
  2. boost gauge readings
    By george gsi in forum Astra Discussion & Chat
    Replies: 6
    Last Post: 29-12-2012, 01:28
  3. Boost gauge readings
    By chrismk4gsi in forum Turbo Petrol Engines inc. Transmissions
    Replies: 9
    Last Post: 29-06-2007, 19:44

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •