Volvo RWD 900 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 6/2010 900 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

Turbo gauge 900 1992

posted by  someone claiming to be Turboman on  Fri Jan 29 10:42 CST 2016 [RELATED]

When I accelerate slowly I can see the needle on the turbo gauge climb with RPMs to about half of the display. Then it drops back to the left to about 1/4 with the engine sounding loudly. This doesn't appear right. How far should the needle go to the right under acceleration ? I've never seen mine go pass the middle.

Thanks







  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Turbo gauge 900 1992

    posted by  Volvo From Heck on  Fri Jan 29 12:21 CST 2016
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Mon Oct 13 20:56 CST 2014
    [RELATED]

    It won't go past the middle (of the positive pressure side of the gauge) --that's the max from the factory. That can be adjusted by the relief valve rod to go to the far right (makes for way more power) but at the expense of possible detonation and certainly reduced engine longevity.
    Accelerating gently will result in mild boost - a heavy application of throttle will cause it to make the factory max.
    Light throttle cruise should show a small amount of vacuum (negative pressure side of the gauge) or a small amount of boost. Throttle closed deceleration should show as a heavy swing to the left on the gauge. -- Dave








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      Turbo gauge 900 1992

      posted by  jerryc on  Thu Feb 4 13:20 CST 2016
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Wed Oct 8 21:28 CST 2014
      [RELATED]

      Not sure how to put this...
      "won't go past the middle... factory..."
      No. No. No.

      The middle of the gauge is where vacuum ends and pressure begins.
      Factory boost is around 7 psi, and will push the needle to approx halfway into the red. The OP is not seeing this, thus there is no boost. First place to look is intake hoses, some will collapse or fail under pressure, make noise, and not allow boosted air to reach the motor.








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        Turbo gauge 900 1992

        posted by  jerryc on  Fri Feb 5 12:45 CST 2016
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Wed Oct 8 21:28 CST 2014
        [RELATED]

        Can't edit so another post. I said "into the red". I meant not 'red' necessarily, but to the right of center, whether that's white or yellow or chartreuse. I think I recall that some older gauges show yellow then red, and I did not mean way over there.







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.