CorkSport.com is MAZDA PERFORMANCE!
CorkSport.com is MAZDA PERFORMANCE!
Results 1 to 5 of 5

Thread: Tapping vacuum line for boost gauge

  1. #1
    Registered Member

    Cx-7

    Join Date
    Oct 2016
    Location
    Saint peters, MO
    Posts
    7

    Tapping vacuum line for boost gauge

    Hi folks. Can you provide photos of an intake manifold vacuum line that I can use to connect my boost gauge for 2007 Mazda CX-7? Thanks a bunch!

  2. #2
    Registered Member

    Cx-7

    Join Date
    Oct 2016
    Location
    Saint peters, MO
    Posts
    7
    I found the vacuum line from bov to intake manifold. However is normal for it to show negative pressure? Itís reading -18 psi at idle. Any suggestions?

  3. #3
    2008.5 MGM MS3 rsvinylgraphics's Avatar
    Donated: $5


    Join Date
    Oct 2009
    Location
    Indiana
    Posts
    1,190
    Quote Originally Posted by Golferken55 View Post
    is it normal for it to show negative pressure? It’s reading -18 psi at idle.
    That sounds about right to me. If the turbo is not forcing air into the engine, the engine is sucking air which is what causes vacuum. A negative reading on a boost gauge is merely telling you how much vacuum your engine is pulling.
    Last edited by rsvinylgraphics; 02-22-2018 at 06:05 PM.

  4. #4
    Registered Member

    Cx-7

    Join Date
    Oct 2016
    Location
    Saint peters, MO
    Posts
    7
    Is there a better place to tap? That doesnít show negative boost?


    Quote Originally Posted by rsvinylgraphics View Post
    That sounds about right to me. If the turbo is not forcing air into the engine, the engine is sucking air which is what causes vacuum. A negative reading on a boost gauge is merely telling you how much vacuum your engine is pulling.

  5. #5
    Registered Member

    Cx-7

    Join Date
    Oct 2016
    Location
    Saint peters, MO
    Posts
    7
    I mean. That is more negative pressure Than I would have guessed. -18. And only maxes at +5. Would that mean +23 total boost or just +5? I wold think just +5 but that is not stock then. I asked and there is no way to recalibrate it. Any thoughts?
    Last edited by Golferken55; 02-23-2018 at 01:08 PM.

Similar Threads

  1. Where to put the vacuum line for boost gauge
    By Markus323 in forum Mazdaspeed Protege
    Replies: 2
    Last Post: 07-07-2013, 09:00 PM
  2. Boost/Vacuum gauge
    By YouDontGnomeMe in forum Mazdaspeed Protege
    Replies: 8
    Last Post: 10-28-2012, 11:58 AM
  3. MSP Vacuum Pressure w/ boost/vac gauge
    By callITaDAY in forum Mazdaspeed Protege
    Replies: 22
    Last Post: 05-21-2011, 07:01 PM
  4. Proper Vacuum line routing for Boost Gauge install
    By KrGsMrNKusinagi in forum Mazda6 Engine & Transmission
    Replies: 2
    Last Post: 02-14-2010, 12:15 AM
  5. Boost/Vacuum Gauge
    By 02ESwBoost in forum Protege5
    Replies: 6
    Last Post: 11-24-2004, 12:43 AM

Bookmarks

Posting Permissions

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