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  1. #1
    Boost-A-Holic's Avatar
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    Bosch 48s or 50s???

    Hey you guys i went ahead and pulled the trigger on the ET137x4 Billet wheel to throw in the X-charger. All thats left is bigger injectors. I currently have the bosch 42s and some say it can work but id rather not risk it. On top of X-xharger with ET 137, mods are 4" intake, Fizzle H/E, TDR box + thru-hull, Riva grate, 15/20, Stock ECU, CMD +Autotune.

    Should i give the 42s a chance? Or should i order bigger injectors and if so the 48s or 50s?


  2. #2
    monaroman76's Avatar
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    Quote Originally Posted by Boost-A-Holic View Post
    Hey you guys i went ahead and pulled the trigger on the ET137x4 Billet wheel to throw in the X-charger. All thats left is bigger injectors. I currently have the bosch 42s and some say it can work but id rather not risk it. On top of X-xharger with ET 137, mods are 4" intake, Fizzle H/E, TDR box + thru-hull, Riva grate, 15/20, Stock ECU, CMD +Autotune.

    Should i give the 42s a chance? Or should i order bigger injectors and if so the 48s or 50s?
    You have an AFR gauge right? I'd give the 42's a go, as long as you are monitoring AFR's you'll know if you need to upgrade, but I think you'd be okay. I was very rich up top with stock x ecu and stock fuel pressure with the xx and 48#.
    This is just my opinion, I'm sure others will disagree.

  3. #3
    boost junkie skidoochris's Avatar
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    I bet you will be very lean in the cool weather
    and ok in the heat
    brp went to 48s for reason....

  4. #4
    jk's Avatar
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    Hey man still got the 48s or 50s if you are interested and personally I would run the 48s.

    John

  5. #5
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    With the CMD..... you can run either set.

  6. #6
    Boost-A-Holic's Avatar
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    Quote Originally Posted by jk View Post
    Hey man still got the 48s or 50s if you are interested and personally I would run the 48s.

    John
    cool man i might try the 42s but if not ill def let you know on those 48s.

  7. #7
    mikelytle1077's Avatar
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    i know with my 42's and they x charger im at +20% fuel up top, when i lean it out a bit it will still be around 17-18% not sure how much more the 42's will flow till they reach 100% DC

  8. #8
    Water4fire's Avatar
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    I have 48's in a RXT-X with Riva ECU and 2Rude and it is rich on bottom. BUT you have CMD. Maybe just go 50's to have a line of growth as heck you have the CMD. It would also run lower fuel pressure's and save your stock pump if not upgraded.

  9. #9
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by Boost-A-Holic View Post
    cool man i might try the 42s but if not ill def let you know on those 48s.
    The 42# injectors will start going lean at about 7000 rpm, 12.5:1 +/- and goes leaner still with more rpm.......I'm using a mini-rude w/50s. I tried the 42s b/c the 50s are too rich at idle. The 42s were good as long as you're not on boost or little boost.

  10. #10
    Boost-A-Holic's Avatar
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    so ive takin the 42s off the list. Will the 48s work later on down the road when i want to run higher RPMs than stock??

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