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  1. #1
    skigolfnut's Avatar
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    What is best way to check for boost leaks on a RXP Intake manifold?

    I have been chasing my tail to try and find a boost leak on my RXP,
    I tried using a feather, smoke, compressed air all hoses are on tight checked with mirror all the way around,

    I have the ET-137 wheel and spacer and I used to get 8600 to 8700 rpms last year but now 8150 tops,

    changed plugs, checked slip, cleaned intercooler, running a 9200 flashed ecu with 80 lb Siemen injectors, Supertech springs and retainers rrfpr- afr gauge, rear air, good compression on all cylinders,
    hitting 12.9 on wide open throttle, it gps at 73.5 only
    Erik did the prop to 13/18.5

    any ideas let me know? running a 83mm nozzle in fresh water,


  2. #2
    JFizzleJR's Avatar
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    You been to the dealership lately? Almost sounds like the ECU flash might have been wiped out.

    Quote Originally Posted by skigolfnut View Post
    I have been chasing my tail to try and find a boost leak on my RXP,
    I tried using a feather, smoke, compressed air all hoses are on tight checked with mirror all the way around,

    I have the ET-137 wheel and spacer and I used to get 8600 to 8700 rpms last year but now 8150 tops,

    changed plugs, checked slip, cleaned intercooler, running a 9200 flashed ecu with 80 lb Siemen injectors, Supertech springs and retainers rrfpr- afr gauge, rear air, good compression on all cylinders,
    hitting 12.9 on wide open throttle, it gps at 73.5 only
    Erik did the prop to 13/18.5

    any ideas let me know? running a 83mm nozzle in fresh water,

  3. #3
    skigolfnut's Avatar
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    we practice at genes in Baytown each week and they are a Seadoo dealer, could they check what my ecu is flashed at?

    I put in a Rotax racing ecu and the greens 42's back in just to be sure and it reached 8000 rpms and went 4 miles per hour slower on the gps

    I saw this post fro Mongo what is everyone using to plug the charger and exhaust>??

    "When I do a leak check I put a cap over the inlet to the supercharger with a fitting in it. Pull the j-pipe off and cap the exhaust manifold. Then hook up the compressor to the cap on the charger and pressure up till i get to 18 pounds on the boost gauge. That way you check the whole intake system from the charger to the intake manifold."

  4. #4

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    12.9? My old riva tune liked 12.7-12.8, but my 80 lb. flash does not like anything over 12.0.

    http://www.siliconeintakes.com/intak...30db6c66603afd

  5. #5
    skigolfnut's Avatar
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    sorry 12.0 to 12.2 usually on wide open runs I was at 11.5 and everybody said it was too rich, I like the intercooler cover,

  6. #6

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    I've never seen an intercooler cover? What is that?

  7. #7
    ricky86's Avatar
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    This is what i made to find boost leaks. Its just a plactic cap with a fitting where i can connect my engine leak tester to. i use soapy water to find any leaks.

    Click image for larger version. 

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  8. #8
    ricky86's Avatar
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    for your rpm issue, i assume you checked the slip of the supercharger.
    maybe your cam timing is off/slipped i had that once and lost a few hundred rpm's.

    check also for exhaust leaks or maybe the sc wheel in spinning on the shaft

  9. #9
    Steve-m31164's Avatar
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    Have you checked your inlet manifold for a leak ? You may have split it

  10. #10
    skigolfnut's Avatar
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    I put a cap on the intercooler hose that comes from the supercharger pumped it up to about 15 lbs and found no leaks to speak of, one little leak on the internal intercooler cap off plug one of the reference line plugs was leaking just a tad, put pipe goop on and fixed that one,
    i have rear air and so my catch can smoke should not bother the performance, what is the best way to check timing chain?

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