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  1. #1

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    Impeller pitch question ?

    05 rxp.
    Mods as follows-
    4 inch air intake
    riva supercharger 10psi
    42lb injectors
    rrfpr
    pump wedge
    vts extension
    OPAS block off
    scoop grate
    free flow exhaust
    short Waterbox
    XS intercooler w hard pipes
    BOV


    Think that's most of it...
    What do you guys think for impeller ?
    15/20? 15/21?
    Looking for all around performance.

    also what's your top speed estimates ?


  2. #2
    mibunkerking's Avatar
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    I would think a 15/20 would be a tad bit tall, defiantly a 21. I say a 14/19 unless you plan to add more.

  3. #3

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    Ok awesome

  4. #4
    Site Admin Green Hulk's Avatar
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    Definitely a 14/19R with those mods!
    http://www.4-tecperformance.com/inde...products_id=11

    if you don't already have one, this is the impeller tool you need
    http://www.4-tecperformance.com/inde...roducts_id=306


    don't forget you will also need to change the wear ring when you install a new impeller. Here is the OEM replacement
    http://www.4-tecperformance.com/inde...roducts_id=518

    Here is the best replacement
    http://www.4-tecperformance.com/inde...roducts_id=401

  5. #5

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    That has to be the best reply EVER.

  6. #6
    JFizzleJR's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Definitely a 14/19R with those mods!
    IIRC a 15/20R de-pitched 2mm used to be the recommendation for an RXP with air intake, 10 psi charger and external intercooler. This setup yields about 75-77 MPH on average in combination with the other typical supporting mods.

    It is more or less a Riva Stage 2 setup and the Riva Stage 2 came with a Solas 15/20R.
    Check the chart in the product picture here: http://www.4-tecperformance.com/inde...products_id=12

    Also, it is common held opinion that you do not need a RRFPR to handle the fueling of a 10 psi wheel and external intercooler. 42#/hr injectors are enough.

  7. #7

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    What's IIRC?

  8. #8

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    Jfizzle---
    you think this set up is going to do 75-77 on glass?
    That would be fantastic...

    Also, so you do not think an rrfpr is necessary? What do you suggest as a precaution to assure there isn't a lean or rich condition? Don't want to damage engine?

    So consensus is a 15/20R pitched down slightly.
    Or a 14/19R?


    Any other mods you see as a must have improvement with this current set up?
    I was planning to fill ride plate holes for starters.

    Any other mods or tips would be fantastic.

    Thanks guys !

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