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Thread: RRFPR Question

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    formerly Gold06RXP Turbo Nick's Avatar
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    RRFPR Question

    I was wondering how you tune this thing to have a proper air fuel ratio? Do you need an air fuel ratio gauge? Does the fuel pressure start out low and then rise w/ the RPMs of the engine and you add more fuel pressure where needed to keep air/fuel correct?


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    Best of both worlds! RXP & RXT's Avatar
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    Set the reg at about 58 psi (stock fuel pressure) with out engine running. (the fuel pump will run for a few secs when you frist plug the dess key in this is when you need to do the setting) Then check your A/F reading. As the reg see's boost it will up the fuel pressure 1psi for every 1 psi boost.

    I am running 62psi with a B-kit and riva I/C + filter and exhaust on stock ecu. A/F is 12.3 with out seat on then with seat on and heat soak it drops to 11.8.

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    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
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    Quote Originally Posted by GOLD06RXP View Post
    I was wondering how you tune this thing to have a proper air fuel ratio? Do you need an air fuel ratio gauge? Does the fuel pressure start out low and then rise w/ the RPMs of the engine and you add more fuel pressure where needed to keep air/fuel correct?
    If you have an application that needs a Rising Rate Regulator, you should have a wideband O2 sensor to make sure you are in the proper A/F ratio area.

    There really isn't much tuning on the Rude on Piranha you set base fuel pressure to stock (58 psi) and then the FPR adds 1 psi of fuel pressure for every psi of boost.

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    formerly Gold06RXP Turbo Nick's Avatar
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    Ok I see how it works. There is a vac line from the manifold to the regulator. I dident know there was a vac line involved. And you should definatly use a air/fuel gauge to set it up properly? Right? And then you add more fuel pressure if it starts to go lean when the boost comes on.
    Last edited by Turbo Nick; 02-19-2008 at 09:33 PM. Reason: Forgot to add

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    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
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    Quote Originally Posted by GOLD06RXP View Post
    Ok I see how it works. There is a vac line from the manifold to the regulator. I dident know there was a vac line involved. And you should definatly use a air/fuel gauge to set it up properly? Right?
    Oh yeah

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    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by DarthAWM View Post
    If you have an application that needs a Rising Rate Regulator, you should have a wideband O2 sensor to make sure you are in the proper A/F ratio area.

    There really isn't much tuning on the Rude on Piranha you set base fuel pressure to stock (58 psi) and then the FPR adds 1 psi of fuel pressure for every psi of boost.
    thats what i am hoping. I was under the impression from Jerry's thread on the rude reg that I would not need a/f gauge. those are so expensive. I guess there is something else to look into to run the rude with the new rude reg

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    formerly Gold06RXP Turbo Nick's Avatar
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    You guys get your air fuel gauge from Dynotune? Which one?

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    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
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    Quote Originally Posted by GOLD06RXP View Post
    You guys get your air fuel gauge from Dynotune? Which one?
    The LM1 is the most used around here

    While they are expensive, they aren't as expensive as Rotax 1500 parts

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    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by DarthAWM View Post
    The LM1 is the most used around here

    While they are expensive, they aren't as expensive as Rotax 1500 parts
    ok, i will put that on the wish list. I am going to reread that thread cause i swore i read where i could just run the rude with rude reg and be safe.
    I guess i can sell the gtx to fund my rxp.

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    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
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    Quote Originally Posted by skoepp View Post
    ok, i will put that on the wish list. I am going to reread that thread cause i swore i read where i could just run the rude with rude reg and be safe.
    I guess i can sell the gtx to fund my rxp.
    You should be ok, I am pretty sure the Rude reg was built for that purpose.

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