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  1. #1
    AKA: Larry lafjax's Avatar
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    38's vs 42's with stock wheel

    A friend...has an 07 RXT with

    4" intake, XS intercooler, stock SC wheel, 14/19 prop, Gutted waterbox, stock ECU, stock 38# injectors, running 7980 WOT.

    Would he see any benifit if he installed 42# injectors at this point?


  2. #2
    Site Admin Green Hulk's Avatar
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    None at all except worse fuel economy.

    His RPM's sure are low for those mods. He may want to depitch that 14/19 1 mm

  3. #3
    Jeepster's Avatar
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    Still got the stock wheel in that...? Did he still got the ceramics too ?
    Throw that out...and get either a GreenWheel or RR high boost...at least it would fly a bit more...!

  4. #4
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    I ran that setup with a 15/19 3-blade pretty much all summer with no issues...all WOT's were 8100rpm...There was no white marks from overheating when I took the JPipe off to flare it...

    If he bumps up the SC wheel, you will need to go 42's...

  5. #5
    David 1 FAST VE's Avatar
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    Danny what do you mean by the flaring?

  6. #6
    ISLAND RACING seadoo951's Avatar
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    This is J-pipe flaring...


  7. #7
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    Quote Originally Posted by 1 FAST VE View Post
    Danny what do you mean by the flaring?

    The flaring of the end of the JPipe...On my flowbench I found that opening up the ID of the last 1.5-1.75" only about 1/4" reduced backpressure on the pipe itself by 35-37%, and overall exhaust backpressure by 12-15% (depending on setup)....Its a nice compliment to any custom exhaust system...

    Near the bottom of my opening post....
    http://greenhulk.net/forums/showthread.php?t=40111

  8. #8

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    Quote Originally Posted by Danny View Post
    If he bumps up the SC wheel, you will need to go 42's...
    You dont need to go bigger injectors, i am running stage2 rude charger on my 05 rxp with stock injectors and stock ecu i fitted the piranha parts rising rate fuel regulator had no problems with that.

    http://www.4-tecperformance.com/inde...roducts_id=669


    Mick.

  9. #9
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    Quote Originally Posted by Mick View Post
    You dont need to go bigger injectors, i am running stage2 rude charger on my 05 rxp with stock injectors and stock ecu i fitted the piranha parts rising rate fuel regulator had no problems with that.

    http://www.4-tecperformance.com/inde...roducts_id=669


    Mick.


    The rising rate pressure will work also, but at the beginning of the summer, I didn't know that!

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