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  1. #1

    How far can I go with 42lb injectors?

    Im assuming that its a riva stage 3 wheel, but whats the most bang for the buck? Id like to go as far as I can without having to get into tuning and buying a new ECU.

    I know that there are a number of wheels on the market. For a stock ecu and 42s, is the stage three my best option?


  2. #2
    Site Admin Green Hulk's Avatar
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    Yep, S3 is as far as you can get with the 42's

  3. #3

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    S3 SC and external intercooler, stock ECU and 42's it's been proven you can go 78-80 mph on a well sorted combo. Add and RRFPR or AEM F/IC and you can go much bigger, perhaps even 2rude.

  4. #4
    pet's Avatar
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    my 07 RXP was doing 77.2 mph on gps with out ecu update.
    -S3 SC
    -42lb
    -rear air
    -riva intake
    -15/20
    -all the hull mods .......
    -oh and the #1 mod - GH water box for sound.


  5. #5
    pet's Avatar
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    my 07 RXP was doing 77.2 mph on gps with stock ecu , 8150 rpm
    -S3 SC
    -42lb
    -rear air
    -riva intake
    -15/20
    -all the hull mods .......
    -oh and the #1 mod - GH water box for sound.


  6. #6
    Quote Originally Posted by pet View Post
    my 07 RXP was doing 77.2 mph on gps with stock ecu , 8150 rpm
    -S3 SC
    -42lb
    -rear air
    -riva intake
    -15/20
    -all the hull mods .......
    -oh and the #1 mod - GH water box for sound.


    Im currently planning- XS intercooler, gibson exhaust, riva intake, 42lb injectors, stage three wheel, plus the little bolt ons- intake grate, prop, etc.

    I just want to make sure that the s3 wheel is going to yield the most power based on my other mods.

    how much boost is it, 10psi? whats the actual HP gain?

    According to riva, the S2 wheel and an Intercooler puts a stock RXP into RXP-X territory.. so im curious as to what actual HP numbers are for the various stages.

  7. #7

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    Quote Originally Posted by twelvesorbetter View Post
    ... so im curious as to what actual HP numbers are for the various stages.
    Stock: 210 hp
    Riva S1: 215 hp
    Riva S2: 230 hp
    Riva S2 with Gen 2 wheel: 240 hp
    Riva S3: 255 hp

    With the S3 SC, XS intercooler, and stock ECU, you can expect around 245-250 hp.

  8. #8
    Avion3333's Avatar
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    Quote Originally Posted by engineermike View Post
    Stock: 210 hp
    Riva S1: 215 hp
    Riva S2: 230 hp
    Riva S2 with Gen 2 wheel: 240 hp
    Riva S3: 255 hp

    With the S3 SC, XS intercooler, and stock ECU, you can expect around 245-250 hp.
    so basically a s3 rxp is a rxpx

  9. #9

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    Quote Originally Posted by Avion3333 View Post
    so basically a s3 rxp is a rxpx
    Pretty much, as far as I can tell.

    Engines are the same.
    X charger is slightly better than S3.
    Both have external intercoolers.
    S3 can rev a little higher.

    Weird prop/nozzle/tunnel on the X slows down its top speed.

  10. #10
    Quote Originally Posted by engineermike View Post
    Pretty much, as far as I can tell.

    Engines are the same.
    X charger is slightly better than S3.
    Both have external intercoolers.
    S3 can rev a little higher.

    Weird prop/nozzle/tunnel on the X slows down its top speed.


    The Riva tech I spoke to last compared stage two to a stock rxp-x.. That sounded more accurate to me.
    I did not think the x charger was bigger than stage 3....

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