Boost gauge reading

1. danny-vts Saxperience Post Whore Joined: Dec 2010 Chesterfield/Nottingham Posts: 7147 dead vts. twisted 106 gti. '03' vtrrrr

   #1 3rd December 2013, 05:02

   Fitted boost gauge and on ignition lights (no engine running) it sits on zero, but upon start up it will go to minus 0.7 - 0.8, is this normal and is there a way i can get it to sit on zero when engine is running?
   
   How it sits with engine off:
   
   
   Cheers
2. user_17444 Infrequent Poster Joined: Aug 2007 Netherlands Posts: 154 Saxo VTR '96(K.I.A.) Saxo 16V VTS '01

   #2 3rd December 2013, 09:30

   If the engine is running idle your throttle is closed.
   
   It depends where you run your take off, before or after the throttlebody.
   
   When it's ran from behind the throttlebody you will get a vacuum reading as the throttle is closed and the engine is sucking in air.
   
   If I were you I'd leave it like this.
3. Kwik-Nick L-plater Joined: Jan 2012 Watford Posts: 49

   #3 3rd December 2013, 09:59

   Quote:

   Originally Posted by danny-vts Fitted boost gauge and on ignition lights (no engine running) it sits on zero, but upon start up it will go to minus 0.7 - 0.8, is this normal and is there a way i can get it to sit on zero when engine is running? How it sits with engine off: Cheers

   This is how it supposed to work. It will be on zero only on full throttle. You will never see reading over 0, unless your engine is boosted.
4. Kwik-Nick L-plater Joined: Jan 2012 Watford Posts: 49

   #4 3rd December 2013, 10:03

   When the engine is not running it read atmospheric pressure, which is around 0, on see level and going down when the altitude is higher.
5. W343NNA Frequent Poster Joined: Mar 2012 Derbyshire Posts: 770

   #5 3rd December 2013, 10:55

   Quote:

   Originally Posted by Kwik-Nick This is how it supposed to work. It will be on zero only on full throttle. You will never see reading over 0, unless your engine is boosted.

   LOL!
   
   do you really think he would fit a boost gauge if he didn't have a turbo...
6. Kwik-Nick L-plater Joined: Jan 2012 Watford Posts: 49

   #6 3rd December 2013, 11:29

   Quote:

   Originally Posted by W343NNA LOL! do you really think he would fit a boost gauge if he didn't have a turbo...

   I know people who did.
7. user_17444 Infrequent Poster Joined: Aug 2007 Netherlands Posts: 154 Saxo VTR '96(K.I.A.) Saxo 16V VTS '01

   #7 3rd December 2013, 12:24

   Quote:

   Originally Posted by Kwik-Nick I know people who did.

   
8. danny-vts Saxperience Post Whore Joined: Dec 2010 Chesterfield/Nottingham Posts: 7147 dead vts. twisted 106 gti. '03' vtrrrr

   #8 3rd December 2013, 12:36

   Quote:

   Originally Posted by Rowan If the engine is running idle your throttle is closed. It depends where you run your take off, before or after the throttlebody. When it's ran from behind the throttlebody you will get a vacuum reading as the throttle is closed and the engine is sucking in air. If I were you I'd leave it like this.

   It's running before throttle body. Will leave it, just wanted to know if it was normal or not lol.
   
   

   Quote:

   Originally Posted by Kwik-Nick This is how it supposed to work. It will be on zero only on full throttle. You will never see reading over 0, unless your engine is boosted.

   Yes ofc it's boosted, why on earth wold i fit a gauge if it wasn't? lmao

   1 user thanked this post: W343NNA
9. Kwik-Nick L-plater Joined: Jan 2012 Watford Posts: 49

   #9 3rd December 2013, 14:08

   Quote:

   Originally Posted by danny-vts It's running before throttle body. Will leave it, just wanted to know if it was normal or not lol. Yes ofc it's boosted, why on earth wold i fit a gauge if it wasn't? lmao

   It has to be after the throttle body. Are you sure it's before? If it's before will not read vacuum.
10. danny-vts Saxperience Post Whore Joined: Dec 2010 Chesterfield/Nottingham Posts: 7147 dead vts. twisted 106 gti. '03' vtrrrr

    #10 3rd December 2013, 16:44

    yes im sure, its coming off the inlet where the old breather pipes were attached to
11. Kwik-Nick L-plater Joined: Jan 2012 Watford Posts: 49

    #11 3rd December 2013, 21:40

    Quote:

    Originally Posted by danny-vts yes im sure, its coming off the inlet where the old breather pipes were attached to

    This mean it's after throttle body. Leave it as is.
12. user_39461 Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.

    #12 3rd December 2013, 22:27

    Yes. Normal.

    1 user thanked this post: danny-vts