Page 1 of 2 1 2 LastLast
Results 1 to 10 of 15
  1. #1
    It's not the destination, it's the journey!! Rip'nTear SHO's Avatar
    Join Date
    Apr 2008
    Location
    Ft. Lauderdale
    Posts
    4,573

    What should stock SHO/FZR vacuum be?

    What should stock SHO/FZR vacuum be? i've heard a couple of people say they are in the 7-9 inches Hg vacuum @ idle (all with dynotune gauges i believe) whilst I am reading almost double that with my lfg Pro-Comp (15 in HG).

    Are these gauges calibrated differently? Why the difference? What kind of numbers are u guys seeing?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_2346.jpg 
Views:	74 
Size:	108.6 KB 
ID:	129167   Click image for larger version. 

Name:	DSC00845.JPG 
Views:	81 
Size:	1.95 MB 
ID:	129168   Click image for larger version. 

Name:	DSC00846.JPG 
Views:	70 
Size:	1.99 MB 
ID:	129169  


  2. #2
    hitman's Avatar
    Join Date
    Aug 2006
    Location
    Ft. Lauderdale, FL
    Posts
    4,328
    +1
    12
    Good question Rip. Also my dynotune gauge reads .2 when the engine is off even.

  3. #3
    Awamori's Avatar
    Join Date
    Aug 2008
    Location
    Okinawa Japan
    Posts
    275
    +1
    1
    Quote Originally Posted by hitman View Post
    Good question Rip. Also my dynotune gauge reads .2 when the engine is off even.
    Mine too...... .1 or .2 when off.
    I'm getting 8.8 - 8.9 vacuum all day right now.
    Dynotune gauge

  4. #4
    Quote Originally Posted by Awamori View Post
    Mine too...... .1 or .2 when off.
    I'm getting 8.8 - 8.9 vacuum all day right now.
    Dynotune gauge
    +1

  5. #5
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,930
    +1
    1,407
    The digital gauge is reading in/HG and the mechanical gauge is reading -PSI.

    To convert PSI to in/HG multiply by .49

  6. #6
    I'm still kinda confused so those of us who are using the digital guage are seeing somewhere around 9 in/hg i guess so when you convert that we are running somewhere around 4 psi doesnt really seem right

  7. #7
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,930
    +1
    1,407
    Quote Originally Posted by beerdart View Post
    The digital gauge is reading in/HG and the mechanical gauge is reading -PSI.

    To convert PSI to in/HG multiply by .49
    I think I have this backwards..

    The digital is reading -PSI and the mechanical is reading in/hg..

    To convert PSI to in/hg multiply by 2.04.

    So -8 PSI is 16.29



    Now I am confused???

  8. #8
    wow so we are actually running around 18psi at full speed.

  9. #9
    hitman's Avatar
    Join Date
    Aug 2006
    Location
    Ft. Lauderdale, FL
    Posts
    4,328
    +1
    12
    That can't be right. No way we are running 18 pounds of boost.

  10. #10
    It's not the destination, it's the journey!! Rip'nTear SHO's Avatar
    Join Date
    Apr 2008
    Location
    Ft. Lauderdale
    Posts
    4,573
    Quote Originally Posted by allstar71 View Post
    wow so we are actually running around 18psi at full speed.
    Quote Originally Posted by hitman View Post
    That can't be right. No way we are running 18 pounds of boost.
    I'm running at 8 lbs of boost at WOT (consistent w/ C1 wheel)and 15 in/Hg vacuum at idle........I think the differences were seeing r because the gauges r calibrated differently......dynotune must be reading metric...whatever that is..

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. What should stock compression be on stock 93' waveblaster?
    By mogman8 in forum Yamaha Old School Skis
    Replies: 4
    Last Post: 09-22-2014, 01:14 PM
  2. WTB stock SHO/FZR exit nozzle
    By WATER WOODY in forum Yamaha Classifieds
    Replies: 1
    Last Post: 05-31-2011, 12:30 AM
  3. What should my power an speed be??
    By Trond in forum 4-Tec Performance
    Replies: 20
    Last Post: 12-06-2007, 10:17 AM
  4. What should stock RPM be for GP800/GP1200
    By DTV in forum Yamaha Old School Skis
    Replies: 14
    Last Post: 07-28-2007, 01:17 PM
  5. What should stock RPM be running?
    By Compwhiz82 in forum 4-Tec Performance
    Replies: 14
    Last Post: 05-27-2005, 04:25 PM

Posting Permissions

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