Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    CRS's Avatar
    Join Date
    Jul 2005
    Location
    Auckland, NewZealand
    Posts
    335

    What vacum are you guys getting at idle?

    Fitted a AutoMeter boost gauge today that also shows vacum.Gauge is showing - 11psi vacum.Wondering if this is normal as I saw Jerry was only getting -6.3 ?? I`m chasing a mysterious loss of top end so just checking everything


  2. #2
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    34,995
    +1
    1,902
    Chris, with my Auto Meter gauge i was showing 10-11 inches of vacuum.
    With my digital gauge im getting about 6.8-8.4. I think my digital gauge is more accurate.

  3. #3
    captain obvious Lurker's Avatar
    Join Date
    Jul 2005
    Location
    Visalia, Ca
    Posts
    2,316
    Hulk you have a bigger cam right? That will lose some vacuum. Don't compare the vacuum of a modified engine to one that is not. Porting, cam changes, ect will change the ammount of vacuum.

    On another note the vacuum is read in Inches mercury (inHg). There is no such thing as negative psi.

  4. #4
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    34,995
    +1
    1,902
    Yep, i have the Rotax Racing cam.

  5. #5
    Vern's Avatar
    Join Date
    May 2005
    Location
    Grand Haven, MI
    Posts
    3,571
    +1
    112
    Jerry, awhile back you had a rough idle problem, is that better now? Was there something wrong?

  6. #6
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    34,995
    +1
    1,902
    I don't know whats up with that. My idle is fine, but every now and then it stumbles down to about 1400 RPM's then picks back up. It only does it every now and then.

  7. #7
    Been there and back! BDNJ's Avatar
    Join Date
    Jul 2005
    Location
    Silver Bay, Toms River, N.J.
    Posts
    1,519
    Mine runs -11/-12 every time. Autometer 4376.

    -Brendan

  8. #8
    Water4fire's Avatar
    Join Date
    May 2005
    Location
    New Braunfels TX.
    Posts
    9,382
    +1
    629
    Hey guys I was just going over this post as I just installed my Boost gauge and am getting -10 vacum at idle and I assume this is GOOD?

    I like the search KEY.


    .

  9. #9
    Got Boost? psycho rxp's Avatar
    Join Date
    Jul 2005
    Location
    Port St. Lucie, FL
    Posts
    5,426
    +1
    176
    I usually get 10-12 hg vacuum at idle.

  10. #10
    Water4fire's Avatar
    Join Date
    May 2005
    Location
    New Braunfels TX.
    Posts
    9,382
    +1
    629
    Good. I just installed the gauge in my Glove box and am all happy!
    Just waiting on some Steel Washiers and its on!!!

    What should I see at full boost? RRIC installed? 7lbs?


    .

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Are you guys getting excited about the SHO?
    By Green Hulk in forum Yamaha PWC Performance (4-stroke)
    Replies: 52
    Last Post: 01-02-2014, 10:35 PM
  2. What wax are you guys using on your skis?
    By bruceg in forum Sea Doo Open Discussion
    Replies: 10
    Last Post: 08-02-2012, 01:18 PM
  3. What vests are you guys sporting out there?
    By Tommy Pantsdown in forum Yamaha Open Discussion
    Replies: 4
    Last Post: 08-27-2010, 08:54 PM
  4. So what are you guys up to on this Tuesday nite??
    By two2curupt in forum Sea Doo Open Discussion
    Replies: 44
    Last Post: 11-23-2005, 08:17 PM
  5. What are you guys doing with stock parts off your ski?????
    By Jrsrxp in forum 4-Tec Performance
    Replies: 15
    Last Post: 09-30-2005, 05:57 AM

Posting Permissions

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