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Old 01-07-2001, 11:26 PM   #1
Scooby Specialist
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Post will this work on NA engines

i was wondering if a fuel pressure riser or regulator will add any horsepower, or what is its purpose and will it work on na engines and which ones are good
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Old 01-08-2001, 01:42 AM   #2
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I'm wondering how that will work myself. I have MRT headers/exhaust and cobb intake. herad that weapon R FPR sucks. any advice

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Old 01-08-2001, 01:59 AM   #3
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A fuel pressurizer, won't ADD HP, all it does it, supply more fuel into the fuel rail/injectors. It would help on a turbo, but it could help on a N/A car if you have an AFR reading that you're too lean, which I highly doubt would happen unless you over gapped the spark plugs.
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Old 01-08-2001, 10:36 AM   #4
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See my other post.

Fuel pressure risers will only work if you're car is sucking in a good amount more of air and your fuel system for some reason can't handle the extra air with more fuel. The trick is to maintain a good fuel/air ratio around 14.7:1 for NA motors. If you have some drastic cams and headwork done to a point where your a/f is low, then yes, increasing fuel pressure can help you out.

On MAF systems, the ecu is able to compensate the additional fuel for mostly mild mods. In Subarus case on the '99 models, adding an intake will let your motor run lean above 4.5K but you should get an electronic device for that since a Fuel pressure riser adds fuel across the whole rpm range and you only want fuel in the rpm range where it is needed. Too much fuel will make your engine bog, not to mention fail emmissions.
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