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Thread: RRFPR question

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    Vern's Avatar
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    RRFPR question

    If I installed an RRFPR and a 'big' SC like a Rude (with Riva ECU and 50s), adjust it to 60 lbs upon keying, it sounds like I should be fine with fueling, right? My main question tho, is if I have to swap SCs for whatever reason, and install a much more tame SC, will I have to remove the RRFPR or change the fuel pressure, or will it run fine with 3 - 4 lbs less boost too?


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    Quote Originally Posted by Vern View Post
    If I installed an RRFPR and a 'big' SC like a Rude (with Riva ECU and 50s), adjust it to 60 lbs upon keying, it sounds like I should be fine with fueling, right? My main question tho, is if I have to swap SCs for whatever reason, and install a much more tame SC, will I have to remove the RRFPR or change the fuel pressure, or will it run fine with 3 - 4 lbs less boost too?


    You just adjust the RRFPR accordingly. Idealy you would have a AF setup to see how much of a change is needed in pressure.

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    Vern's Avatar
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    Quote Originally Posted by Danny View Post
    You just adjust the RRFPR accordingly. Idealy you would have a AF setup to see how much of a change is needed in pressure.
    Thanks Danny, makes sense. I don't have an AFR bung or gauge yet ... may have to do that if I upgrade over the winter ...

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    Site Admin Green Hulk's Avatar
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    Vern, if ever you went to a SC with less boost you could just unplug the boost reference hose from the RRFPR and it would act just like a stock regulator.

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    Vern's Avatar
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    Got it, thanks Jerry! They seem pretty versatile!

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    Big K's son KeithKman's Avatar
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    Regarding the RRFPR, I have a question.

    Where I ride the weather varies drastically from Dec to Aug. In Dec the air temp is in the mid 40's while the water is in the low 50's. Come Aug. the air temp is 115+ and the water is 88.

    Say I dial in the AFR in Aug, come Dec do I have to re-dial in the RRFPR?

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    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by KeithKman View Post

    Say I dial in the AFR in Aug, come Dec do I have to re-dial in the RRFPR?
    No adjustment necessary. In cooler months you make more boost. The RRFPR is boost sensitive and adjusts for it. In hotter months less boost, the RRFPR adjusts again.

    More boost = more fuel pressure and vice versa

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    Big K's son KeithKman's Avatar
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    Quote Originally Posted by Green Hulk View Post
    No adjustment necessary. In cooler months you make more boost. The RRFPR is boost sensitive and adjusts for it. In hotter months less boost, the RRFPR adjusts again.

    More boost = more fuel pressure and vice versa
    Interesting. So once the RRFPR is dialed in I am good to go for as long as I don't change the setup of the ski? I like that.

    So in theory, I could borrow a AFR gauge, dial the ski in once, and never have to use an AFR gauge ever again?

    What if I ride somewhere at sea level and not where I normally ride at 1105 feet above sea level, will the RRFPR need to be adjusted or not?
    Last edited by KeithKman; 09-04-2008 at 11:21 PM.

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    Big K's son KeithKman's Avatar
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    ttt

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    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by KeithKman View Post
    Interesting. So once the RRFPR is dialed in I am good to go for as long as I don't change the setup of the ski? I like that.

    So in theory, I could borrow a AFR gauge, dial the ski in once, and never have to use an AFR gauge ever again?

    What if I ride somewhere at sea level and not where I normally ride at 1105 feet above sea level, will the RRFPR need to be adjusted or not?
    This is correct!

    Same principal applies at high elevations. At 1105 ft elevation you don't make as much boost so the RRFPR will not make as much fuel pressure.

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