Results 1 to 7 of 7
  1. #1

    Join Date
    Aug 2007
    Location
    Jersey Shore
    Posts
    4

    Please Help Slow Rxp

    I am a long time reader but this is my first post. I would like to start by saying this site is great and thanks for everything. I have an 04 rxp and the best top speed I can get is 73.5 gps this is the list of mods any input would be great.
    Sealevel .5 fuel saltwater
    Impros repitched solas 13-18 to 14/20
    SS wear ring
    Ifizzle I/C
    Green wheel 9.2-9.5 LBS Boost
    Opas block off R & D
    R & D input grate
    Gridle kit
    Trim wedge 2.5
    Flaired J pipe
    Shorty waterbox
    Pro series reduction nozzle 8/mm ring
    DYI front air intake
    Skegs
    free mods


  2. #2
    Well for starters you are losing 1mph from the R&D intake grate. I also hear saltwater tends to be 1mph slower than fresh water. What RPM are you turning?

  3. #3

    Join Date
    Aug 2007
    Location
    Jersey Shore
    Posts
    4
    rpm are 8050 to 8100 with 81 mm ring. should I change the intake grate?

  4. #4
    That's up to you. The R&D grate is supposed to be faster in chop than the Riva grate, but if you're going for top speed in smooth conditions the Riva grate is definately the way to go.

  5. #5
    DaveC's Avatar
    Join Date
    Jun 2007
    Location
    Central Oklahoma
    Posts
    2,362
    +1
    41
    Do you have a rising rate fuel pressure regulator or larger injectors ?

  6. #6

    Join Date
    Aug 2007
    Location
    Jersey Shore
    Posts
    4
    42# injectors

  7. #7
    DaveC's Avatar
    Join Date
    Jun 2007
    Location
    Central Oklahoma
    Posts
    2,362
    +1
    41
    I would try the Riva intake grate and a 15/20 impeller, they are proven in many setups similar to yours.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Please Help 2008 RXP Cutting out while riding???
    By eschanen85 in forum 4-Tec Performance
    Replies: 11
    Last Post: 06-06-2013, 08:32 PM
  2. 2007 RXP Problem! Please Help
    By Ericc in forum 4-Tec Performance
    Replies: 10
    Last Post: 06-11-2007, 10:33 AM
  3. RXP will not start, PLEASE HELP!
    By TroyRXP15 in forum 4-Tec Performance
    Replies: 13
    Last Post: 05-27-2007, 05:36 PM
  4. Help 04 RXP is slow!
    By Matth3wJL in forum 4-Tec Performance
    Replies: 21
    Last Post: 09-06-2006, 09:41 AM
  5. '05 Rxp Problem Please Help
    By WannabeGoing80 in forum 4-Tec Performance
    Replies: 2
    Last Post: 07-16-2006, 03:02 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
  •