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Does a RRFPR reduce the amount of fuel flowing when there is lower pressure? Wondering how it manages flow at lower RPMs & whether it's more intelligent than a static FPR, which I gather can run rich at the low end but fine at the high end?

I doubt a RRFPR is going to correct a poorly tuned c900, say if there's an issue with the AMM or coolant temp sensor or something else causing the car to run rich & fail an exhaust test. Presumably the car'll continue to run rich even with a RRFPR?

Guess I don't know how a RRFPR works, particularly in relation to the fuel chip & proper tuning. Can someone 'splain? :D
 

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RRFPR will run normaly at vaccum but with boost it will gradualy increase the pressure, more boost the higher the rate, depending on adjustment. Stock FPR is regular rate, 1psi per 1psi of boost.

At emission testing they don't go much into boost so it would not be much of a factor. But you should put stock regulator when going to emissions.
 
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