Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 28
  1. #1

    Join Date
    Jul 2005
    Location
    Lake Dunlap, Texas
    Posts
    1,599
    +1
    28

    Boost Gauge Issue

    I have a 2008 RXT-X which I have installed a new blue square Dynotune boost gauge feeding off the Riva intake manifold intercooler relocation block off. I have installed like set ups on other 4-tec Seadoos. Heres my problem. Gauge reads a vacuum reading up to just over 6000 rpm as it should. I am running a stock ECU and my max RPMs are just over 8100 at just over GPS speed of 73 MPH. However at this RPM range my boost gauge reads only 1.5 lbs of boost to 2.6 lbs of boost. And the readings jump up and down rapidly. Called Dynotune and they said they had never heard of this--but to hook up and air compressor to the gauge imput and see what it read. Well--it read up to 60 lbs which is what I set my compressor at. Called Dynotune and they instructed me to send the gauge complete back to them. They called me several days later and said there testing showed the gauge to be operating as designed and set it back to me. I reinstalled the gauge and same problem. My ski would not be running the RPMs and speeds it does if I had a boost leak. Would appriciate anyones thoughts and insight on this. Thank you.


  2. #2
    JFizzleJR's Avatar
    Join Date
    Aug 2005
    Location
    FL
    Posts
    8,627
    +1
    806
    Ray, the only malfunctions I've seen in boost gauges are when water hits the sensor. Going with my theory, there is a chance you may have a small intercooler leak. Not enough to notice it in RPMs or to foul plugs, but enough to saturate the small surface of the sensor...

  3. #3
    Got Boost? psycho rxp's Avatar
    Join Date
    Jul 2005
    Location
    Port St. Lucie, FL
    Posts
    5,445
    +1
    182
    If not what james said, than

    Maybe your getting an over charging/under charging issue

    Put a volt meter on your battery while running, and see where your at. Too high a voltage, can cause erractic readings (lika a bad rectifier/fuse)

  4. #4
    BlackHawk's Avatar
    Join Date
    Mar 2006
    Location
    AL
    Posts
    959
    +1
    2
    Quote Originally Posted by psycho rxp View Post
    If not what james said, than

    Maybe your getting an over charging/under charging issue

    Put a volt meter on your battery while running, and see where your at. Too high a voltage, can cause erractic readings (lika a bad rectifier/fuse)
    +1

  5. #5

    Join Date
    Jul 2005
    Location
    Lake Dunlap, Texas
    Posts
    1,599
    +1
    28
    Thanks guys for the imput. I will check out your sugjestions and get back to the thread with the results. It will be several days before I can run the tests.

  6. #6
    Banned User
    Join Date
    Dec 2006
    Location
    Crest Hill, IL
    Posts
    9,512
    +1
    215
    How are you powering the gauge?

  7. #7
    West Texas RXP skoepp's Avatar
    Join Date
    Oct 2007
    Location
    west texas
    Posts
    12,019
    +1
    149
    sorry you having issues with the boost gauge on ski. Is this the same gauge that was on there when i sold you the ski or a different one?

    Hope you get it figured out.

  8. #8

    Join Date
    Jul 2005
    Location
    Lake Dunlap, Texas
    Posts
    1,599
    +1
    28
    Danny--I am powering it off the purple wire to come on with they laynard like I have done on all my other boats.

    Steve--No this is a brand new blue face Dynotune. Cant seem to figure it out.

  9. #9
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    FYI,
    after I went thru a few of the sending units, and talking to dynotune, I ended up mounting the sending units AWAY from the heat and vibration of the engine with a piece of hard-walled tubing, and a barb female adapter on the end of the sensor. I did the same thing on my pump and fuel pressure sensors and haven't lost one since.

  10. #10
    QATAR RXP TEAM qatar2000kk's Avatar
    Join Date
    Mar 2007
    Location
    (QATAR) Middl East
    Posts
    294
    Quote Originally Posted by JFizzleJR View Post
    Ray, the only malfunctions I've seen in boost gauges are when water hits the sensor. Going with my theory, there is a chance you may have a small intercooler leak. Not enough to notice it in RPMs or to foul plugs, but enough to saturate the small surface of the sensor...
    I agree with you JFizzleJR

Page 1 of 3 1 2 3 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. DynoTune Boost Gauge Issue
    By smbstyle in forum Yamaha PWC Performance (4-stroke)
    Replies: 16
    Last Post: 12-07-2009, 06:01 PM
  2. Boost gauge, Gps, Depth Gauge ideas
    By Mark S in forum 4-Tec Performance
    Replies: 45
    Last Post: 04-17-2006, 09:59 PM
  3. Pics of the Boost Gauge
    By Red Devil in forum 4-Tec Performance
    Replies: 15
    Last Post: 02-27-2006, 09:43 AM
  4. Boost Gauge, again.......
    By Kinchyle in forum 4-Tec Performance
    Replies: 59
    Last Post: 09-30-2005, 10:09 PM
  5. Boost Gauge
    By Red Devil in forum 4-Tec Performance
    Replies: 3
    Last Post: 08-09-2005, 09:09 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
  •