can anyone enlighten me? also would both be required on a turbo application? thank you

 

Thanks for this reply in the other forum... thanks "sonny"

Typically, an FPR like the one on the rail will control the fuel pressure from idle to atmospheric pressure (0psi/0" vacuum aka WOT on an NA car).
FMU's are designed to control fuel pressure from 0psi to maximum boost. They add x amount of fuel pressure for every psi of boost. A 12:1 FMU adds 12 psi of fuel pressure for every 1 psi of boost.

If you are not running a standalone, then yes, you need both devices. The stock FPR is not designed to and will not deliver enough fuel under boost with stock injectors. The FMU (with the exception of the Cartech Super FMU) cannot control the fuel pressure while the engine is under vacuum (ie, cruising). If you are not running a standalone, you will need both devices to make the car run "right".

The AEM FPR is basically an FPR/FMU in one, but the rise rate is fixed at 1:1. It is perfect for standalones, but will not deliver enough fuel for stock injectors. People often get the AEM FPR in conjuction with an FMU because the high flow pumps that are needed by FMU's often overwhelm the stock FPR, resulting in idle pressure that is too high.

Sonny

 

looks like my question has been answered. i think its final


https://honda-tech.com/zeropost?cmd=reply&id=1820565

 

you will still need an fpr regardless, the stock ones are junk

 

thats what i was hoping to hear.. cause i just bought the AeM FpR.. and i didnt want to think that i wasted my money..

 

you will also need a mechanical fuel pressure guage to monitor what psi you are setting it at, does it have a guage port on it?. I am running a SARD fpr and a 1-5/8"??? auto meter mechanical fuel guage it was like 25 bucks from jeg's

since its so hot i have it set at 40-41 psi at idle,

cold otherwise she is usually at 42-45 depending on how cold it is

you can really tell where the stock one starts to give out on the top of the rev range