Results 1 to 6 of 6
  1. #1
    tpd's Avatar
    Join Date
    May 2008
    Location
    Hamburg, NY
    Posts
    263
    +1
    25

    Added 4 inch intake, no RPM Difference, but more speed??

    I put in my 4 inch intake (kanaflex, spectre filter) and tested it out.

    My RPMs stayed the same, 7950, but I hit my highest speed on the GPS to date, 65.5.

    Does this make any sense??? Can you go faster but not increase RPMs?

    Does my prop need to be pitched?


  2. #2
    !!!! wave jumper !!!! 05_RXP's Avatar
    Join Date
    Jul 2011
    Location
    Hamilton, Ontario
    Posts
    513
    i can say that i agree with you on the speed. i added a 4" system over riva 3" and rpm stayed the same but it got faster. i would say you want atleast another 150 rpm

  3. #3
    if rpm stayed same, it cant go any faster.. that intake got nothing to do whit the speed if rpm stayed same.. riding condition must be reason you got quicker..

  4. #4
    tpd's Avatar
    Join Date
    May 2008
    Location
    Hamburg, NY
    Posts
    263
    +1
    25
    Quote Originally Posted by 05_RXP View Post
    i can say that i agree with you on the speed. i added a 4" system over riva 3" and rpm stayed the same but it got faster. i would say you want atleast another 150 rpm
    Must be something in that Lake Erie water on the Canadian side, cause the last time I GPS'd it was on the river which was smoother than the lake the other day. lol

    So what else should I be looking at to get my missing RPMs back?

  5. #5
    !!!! wave jumper !!!! 05_RXP's Avatar
    Join Date
    Jul 2011
    Location
    Hamilton, Ontario
    Posts
    513
    hey you know what, thats exactly what i was thinking but its to bad i was riding on a cannal and gpsed my speed drifiting or should i say sitting still. lol. because i wanted to know an accurate reading so i used days where there was no wind and temperatures and humidity was roughly the same. with the 3" intake the current was actualy 0.2 mph and when i gained the 1 mph the current was 0.0mph. the only thing i can think is my tach is not 100% accurate. in all honestly i dont see how these guys claim 8120 8140 8160 and 8180. my tach only regisiters every 50 rpm. so in theory if my tach says i am at 8100rpm i could technically be anwhere from 8075 to 8124rpm. it all depends on the temps you are at. if there is alot of humidity and hot out you will drop some rpms. but the best way to get your rpm back is by pitching your prop a little

  6. #6
    tpd's Avatar
    Join Date
    May 2008
    Location
    Hamburg, NY
    Posts
    263
    +1
    25
    what impeller should I be looking at, 14/19??

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Good RPM's but no Speed
    By pratzert in forum 4-Tec Performance
    Replies: 8
    Last Post: 07-29-2009, 01:37 PM
  2. XS IC no rpm Gain but lots of accelleration
    By turbojamie in forum 4-Tec Performance
    Replies: 35
    Last Post: 08-25-2008, 06:40 PM
  3. Replies: 3
    Last Post: 11-08-2007, 05:06 PM
  4. My new 4 inch Intake
    By The Bandit in forum 4-Tec Performance
    Replies: 21
    Last Post: 09-20-2006, 05:20 PM
  5. Anybody finish "Shibby 4-inch Intake" yet?
    By gtxsc03 in forum 4-Tec Performance
    Replies: 12
    Last Post: 02-15-2006, 02:04 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
  •