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  1. #1

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    2008 RXPX ECU help with current mods and motor

    I have a 2008 rxpx with the following mods : Rear air intake,riva thru hull exaust,speed freaks mod water box and ride plate,speed freaks cooler and short piping,riva intake mod,riva ECU,riva injectors,fizzle catch can, rotax racing thermostat , et 137 wheel with 3mm spacer,r+d water intake grate,ops removed,reverse bucket removed,riva sponsons, riva wedge and reduction nozzle,wide band and boost gauges.At 20 hours it burned off an exaust valve .i crated the motor ,sent it to glen Perry for a rebuild,it now has new pistons,stainless valves ect,latest valve train upgrades,motor has been balanced ,apr studs,ect ect.I want to install a larger charger and I want help with an ECU.Any one have a recommendation??? Or maps??I am thinking I would like to turn this 8900 rpms. any help or thoughts,???? I was turning it 8540 with the riva ecu. Speed was low 80s Afr was a little lean about 12.3.Or can I have my riva ecu remapped to a higher rev limiter? At what point does the riva ecu start to pull,timing? Any help would be appreciated. I do mix vp 109 unleaded with super unleaded with this set up.


  2. #2

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    I'm thinking motec.? Anyone???

  3. #3
    Mod less, ride more! troyheb's Avatar
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    Did you figure out why the exhaust valve burnt off?

  4. #4

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    Glenn Perry said that the exaust valves are week? I would assume lean?.

  5. #5
    Got Boost? psycho rxp's Avatar
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    Are u using a Rising rate FPR?
    Also Bosch 48#/hr injectors work better than the Riva delphi 50's with their ECU.

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  7. #6

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    I have the 48s ,but never ran them.the Afr s seemed ok with the 50s, I have a riva rising rate set up but never installed it.it seemed rich in mid range but ok wide open with out it.I do use it on my skidoo turbo setups with an additional fuel pump.I really interested in running a bigger wheel and higher rpms.any help on what ecu to use?

  8. #7
    Got Boost? psycho rxp's Avatar
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    Quote Originally Posted by Fasterseadoo View Post
    Glenn Perry said that the exaust valves are week? I would assume lean?.
    the 08 style valves are good ones. The weaker ones were pre 06". If it toasted a valve, it was lean. anything above 12.0 AFR is playing with fire.
    Do u have the Valvetrain upgrade installed? Titanium retainers? springs? If not than u dropped a valve from that RPM without them.

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  10. #8
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by Fasterseadoo View Post
    Glenn Perry said that the exaust valves are week? I would assume lean?.
    The 08+ valves are good. Its the older ones that are notorious for breaking. Yes, afrs @ wot in the 12's like that would not help.
    I like your setup, I would leave it as is, but add open loop.

  11. #9
    Got Boost? psycho rxp's Avatar
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    Quote Originally Posted by Fasterseadoo View Post
    I have the 48s ,but never ran them.the Afr s seemed ok with the 50s, I have a riva rising rate set up but never installed it.it seemed rich in mid range but ok wide open with out it.I do use it on my skidoo turbo setups with an additional fuel pump.I really interested in running a bigger wheel and higher rpms.any help on what ecu to use?
    The Rising rate will pull fuel at vacuum, and add more fuel when needed as boost increases. U should be running one with that much boost. The 48's give the best all around AFR#'s with that ECU. A walbro fuel pump is an upgraded drop in replacement for the OEM one.

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  13. #10

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    The head is now stainless and light valves,titanium parts.It a very bullet proof motor.forged pistons light parts,balanced ectect

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