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  1. #1
    98gsxl951's Avatar
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    installing riva rrfpr which injectors and what base line fuel pressure?

    waiting on my riva rrfpr kit to come in, running a et 137+4, thru hull, kaniflex, custom pitched solas. Just had slip checked on the charger, changed oil, and put a new o2 sensor for the mtxl.

    What injectors should i run, i have my stock 42lb boschs, and 48lb dekas installed currently?

    also what should i start with for baseline fuel pressure?


  2. #2
    warsawspeedfreak's Avatar
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    Its really hard to answer that. Finish your install and leave it at the 58 with the vacuum line hooked up and check your WOT afrs. Adjust from there. Better to start out rich than lean imo. The reason is that the answer will vary depending on your water and air temps and altitude at the time of your 1st trial run. Understand?

  3. #3
    warsawspeedfreak's Avatar
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    I currently run mine at about 45lbs idling with the vacuum line hooked up and get mid 13s at idle mid 12s in the middle and 11.5-11.8 at around 8700rpm...different ecu though...water temp 82 and air temp around 70...Warsaw, Indiana. Elevation around 650ft.

  4. #4
    98gsxl951's Avatar
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    should i re install the 42lb bosch greens (160 hours) ? or try the 2012 48 lb only a few hours on them deka/siemens? stock siemens ecu on a 09 rxpx

  5. #5
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    What's your Afrs? Running stock cooler?

  6. #6
    Having Fun jp1300r's Avatar
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    Quote Originally Posted by 98gsxl951 View Post
    should i re install the 42lb bosch greens (160 hours) ? or try the 2012 48 lb only a few hours on them deka/siemens? stock siemens ecu on a 09 rxpx
    When I was running my 08 RXPX with a 2RUDE and stock ecu I ran the RIVA Delphi 50lb with a RRFPR with boost line attached. Base psi was 54 key on engine not running. I would start at 58 psi and see if it starts first. The Delphi run leaner at idle than most other injectors, so you may have to set the base pressure lower before you ruin your o2 sensor. Oh, think I upgraded my fuel pump too before the 2RUDE.

    The problem I found with this set up was getting the prop right. Also, running near the rev limiter 8200. I never ran a EGT, but looked like the pistons and valves were getting pretty hot upon teardown with the stock ecu set up and big SCer. Thats a big reason why I raised my rev limit up to 9K+.

    Whats your prop pitched to and what exit nozzle are you running? Get it set up right you will be close to 80 mph. Should blast right to 78 mph on the sit.

  7. #7
    98gsxl951's Avatar
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    stock cooler with groco strainer, cooler has 50 hours on it, just pressure tested, stock rxpx nozzle, 2.5 riva wedge, riva opas extensions, worx intake grate, catch can,15/20r prop slow91(chris) re pitched it last year when i was running the black et137 +3 and riva 50s, ran this year with the +4 and i gotta feeling im going to need to pull it and repitch it some more.

    where does the boost line attach? probably been discussed here but havent had time to read through the threads.

    just running pig rich on the riva 50s and et137+4 i was running 75. wot afrs were typically in the low 11s on hot days, cooler weather (low 80s and low humidity) i saw 10.8, 10.9. no wake zones would cause me to load up on fuel though. hence why new o2 and new plugs, i know this can cause piston wash but i never once saw my oil go up, never smelled like gas, ski still runs like a champ. ( knock on wood)

    saw back to the injectors, should i run my stock 42s or try the deka/siemen 48s?

    right now the dekas have an afr of 13.0 at idle, havent ridden ski in 2 weeks so i forget what it was at cruising speed, wot with the old o2 that was failing i saw 12.2, 12.3 .

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