Results 1 to 9 of 9
  1. #1
    richrxp's Avatar
    Join Date
    Jun 2006
    Location
    Netherlands
    Posts
    949
    +1
    1

    Vacuum in/Hg the 4tec engine makes at idle important for setting Turbosmart Bov

    Does anybody know the vacuum pressure at idle for 08 Rxt-x in in/Hg ,i think it will be the same for all 4 tec engines at idle.
    Need to know for setting the springpressure for Turbosmart Raceport Bov.
    You can adjust the pressure by using different springs.

    The ones using the Race port already , please give some advice.

    I'm running 3Rude and Rotax ecu.


  2. #2
    2006 Turbo RXP boBO's Avatar
    Join Date
    Mar 2008
    Location
    STATE OF KUWAIT
    Posts
    1,034
    vacuum pressure depend on your engine comp.

  3. #3
    R88ory RXP's Avatar
    Join Date
    Feb 2008
    Location
    Kent, England
    Posts
    2,737
    +1
    46
    Quote Originally Posted by boBO View Post
    vacuum pressure depend on your engine comp.
    Also cam timing will have some effect.

    R88

  4. #4
    Gone in 3.0 seconds... RXPT400's Avatar
    Join Date
    Nov 2007
    Location
    USA
    Posts
    1,527
    Vacuum pressure at idle speed on a stock 4 tec supercharged motor should be around 8" to 9" Hg sir....

  5. #5
    2006 Turbo RXP boBO's Avatar
    Join Date
    Mar 2008
    Location
    STATE OF KUWAIT
    Posts
    1,034
    on my Turbo -8

  6. #6
    richrxp's Avatar
    Join Date
    Jun 2006
    Location
    Netherlands
    Posts
    949
    +1
    1
    Thanks for all the help guys.
    Ijust needed an average so i have something to start with.
    I thought around 9,because on the fuelcontroller at idle i got 1.1 - 1.2 volts,if you convert this you wil be around 9.

    I know camtiming and more things can affect vacuum at idle,but the Raceport is set at 14 - 17 in/Hg when you buy it.
    I orderd a springkit also.so i will be fine.
    I start with the 9 - 14 springs and see how the response is,and if it will stay closed at boost.

  7. #7
    monaroman76's Avatar
    Join Date
    Mar 2008
    Location
    Whyalla, South Australia
    Posts
    1,979
    +1
    28
    I think my gauge shows about 10...

  8. #8
    R88ory RXP's Avatar
    Join Date
    Feb 2008
    Location
    Kent, England
    Posts
    2,737
    +1
    46
    Quote Originally Posted by richrxp View Post
    Thanks for all the help guys.
    Ijust needed an average so i have something to start with.
    I thought around 9,because on the fuelcontroller at idle i got 1.1 - 1.2 volts,if you convert this you wil be around 9.

    I know camtiming and more things can affect vacuum at idle,but the Raceport is set at 14 - 17 in/Hg when you buy it.
    I orderd a springkit also.so i will be fine.
    I start with the 9 - 14 springs and see how the response is,and if it will stay closed at boost.
    When I was running a BOV I found that if I set it so it blew off at idle I lost some response and it felt slower in the chop, you could hear it blowing the boost off every time I came unhooked, then it obviously take a small amount of time to re-build that boost, if I was in heavy "race" chop it made it feel a lot slower as it never got the chance to build full boost as it was contantly blowing off.

    So I adjusted it down so that it didn't blow at Idle, and it really improved my response I guess it was because it is kinda building a tini bit of boost until you hit the throttle which gives the engine that initial rush of air.

    I don't personally run one now tho. Good luck, hope you get it working nice.

    R88

  9. #9
    richrxp's Avatar
    Join Date
    Jun 2006
    Location
    Netherlands
    Posts
    949
    +1
    1
    I'm also gonna set it ,so that it doesn't blow at idle.
    Just have to find the fineline,for best throttle response and best protection against clutch wear.
    I have never run one before,but since i have 3rude now,i really think it will improve clutch life.
    3rude doesn't hold slip very well because the wheel is so heavy.
    After doing many searches on greenhulk and google i think the best is the turbosmart,i don't trust the Hks that much,they are offered around $50 on ebay.
    Hks usa says they are fake,but imo they aren't,it's just a cheap bov which is mass produced and sold very cheap at wholesale in asia.
    Tial is also very good,but a little more expensive,so i will go Raceport.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Advice on con rods for the 4tec engine
    By mitsakosgt in forum 4-Tec Performance
    Replies: 24
    Last Post: 10-31-2011, 08:46 PM
  2. What should the coil voltage be at idle? (01 GP1200R)
    By Emig5m in forum Yamaha PWC Performance (2-stroke)
    Replies: 5
    Last Post: 10-11-2010, 07:08 PM
  3. What have you lost under the 4tec engine?
    By MikeTrin in forum Sea Doo Open Discussion
    Replies: 30
    Last Post: 11-13-2007, 03:36 AM
  4. Sporadic engine power at idle speeds.
    By allin in forum Kawasaki PWC Performance (4-stroke)
    Replies: 7
    Last Post: 09-26-2007, 07:21 AM
  5. Engine surging at idle, possible causes?
    By 01xdime in forum Kawasaki PWC Performance (4-stroke)
    Replies: 9
    Last Post: 07-05-2007, 10:42 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
  •