Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    formula29's Avatar
    Join Date
    Feb 2014
    Location
    Ormond Beach
    Posts
    139
    +1
    10

    Adding 3.5 or 4" intake??

    I'm a little curious, does adding the larger air intake cause the motor to run any leaner? if so would adding a fpr and raising rail presure a few pounds help? Im sure a a/f gauge would be in order.


  2. #2
    Mpeavler's Avatar
    Join Date
    Dec 2005
    Location
    Elwood , Indiana
    Posts
    5,267
    +1
    187
    Yep anything that gives gains on the intake track will cause leaner conditions. These skis don't compensate because the engine cannot read afr without an 02 sensor to tell it to adapt. There is open and closed loop systems and sadly the skis don't come with the 02 stock which leaves us ((open loop)).

    M

  3. #3
    Branden's Avatar
    Join Date
    Aug 2014
    Location
    Cape Coral, Fl
    Posts
    1,600
    +1
    322
    yes it will lean the ski out a tad.

  4. #4
    formula29's Avatar
    Join Date
    Feb 2014
    Location
    Ormond Beach
    Posts
    139
    +1
    10
    will it lean it out enough to cause damage or should I put the stock system back on? I really didnt notice any performance gain or increase in rpm.

  5. #5
    It is really more accurate to say the tune will change a little. Some places a little leaner and others will get a little fat.

  6. #6
    Mpeavler's Avatar
    Join Date
    Dec 2005
    Location
    Elwood , Indiana
    Posts
    5,267
    +1
    187
    Stock Ecu still restricts max rpm so you won't gain up top Rpm wise or speed wise until you unlock the ski

  7. #7
    NateRXP's Avatar
    Join Date
    May 2013
    Location
    Richmond, TX
    Posts
    745
    +1
    180
    With all the limiters in place in the stock ecu, it's almost worthless modding without a reflash.

  8. #8
    1tommygunner1927's Avatar
    Join Date
    Apr 2007
    Location
    Houston, Texas
    Posts
    9,463
    +1
    2,770
    Are we talking about your ski?

    The engine runs lean stock (WOT is in the 13:1+ range), so removing all the stock air intake stuff, including the flame arrestor and using kanaflex (or other) results in an even leaner running condition (high 13's). At a minimum you will need a rrfpr and an A/F ratio gauge IF using the stock ECU/SCOM.

  9. #9
    1tommygunner1927's Avatar
    Join Date
    Apr 2007
    Location
    Houston, Texas
    Posts
    9,463
    +1
    2,770
    Quote Originally Posted by NateRXP View Post
    With all the limiters in place in the stock ecu, it's almost worthless modding without a reflash.
    Not exactly.....the rate of acceleration will improve, not top speed.

  10. #10
    NateRXP's Avatar
    Join Date
    May 2013
    Location
    Richmond, TX
    Posts
    745
    +1
    180
    I said almost.

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. WTB:Worx or R&D intake grate for RXT
    By cckeong in forum Sea Doo Classifieds
    Replies: 0
    Last Post: 06-13-2008, 03:18 AM
  2. Riva or R&D intake grate.....
    By PDFWHF in forum Yamaha PWC Performance (2-stroke)
    Replies: 11
    Last Post: 06-05-2008, 09:37 PM
  3. RIVA OR R&D Intake Grate
    By mohd22 in forum 4-Tec Performance
    Replies: 2
    Last Post: 05-27-2008, 09:41 PM
  4. riva or r&d intake grate
    By thrasher63 in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 09-14-2006, 07:49 PM
  5. PPG or Riva Air Intake, can't decide
    By Shibby1485 in forum 4-Tec Performance
    Replies: 11
    Last Post: 05-12-2005, 05:50 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
  •