The Difference between FPR and FMU?
06-02-2002, 08:41 PM
#1
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The Difference between FPR and FMU?
If anyone can enlighten me on this? and would you need both on a turbo application?
please post on one central thread. i have cross threaded this for max. feedback
https://honda-tech.com/zerothread?id=199540
please post on one central thread. i have cross threaded this for max. feedback
https://honda-tech.com/zerothread?id=199540
06-02-2002, 09:29 PM
#3
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Re: The Difference between FPR and FMU? (SlowB16)
would i NEED both?? i have just purchased an AEM FPR.. and i know i need to get a FMU.. did i waste my money on the FPR???
06-02-2002, 09:56 PM
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Re: The Difference between FPR and FMU? (KTeller8)
depends if u are gonna go standalone or not..........if u go stand alone your fmu will be useless.
im pretty sure u need FPR if u are going FMU
im pretty sure u need FPR if u are going FMU
06-02-2002, 10:15 PM
#6
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Re: The Difference between FPR and FMU? (TurboTypeR98)
Well since i am OBD2 i dont think that i can use a standalone.. i am not sure though.. i just got the FPR and i am goign to get the FMU. i just hate to see that i wasted my money..
06-02-2002, 10:49 PM
#7
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Re: The Difference between FPR and FMU? (KTeller8)
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
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
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06-02-2002, 11:34 PM
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Re: The Difference between FPR and FMU? (Sonny)
Kteller AEM EMS is a nice and easy solution standalone for odb2, if I get one it will be this system, I've heard all good about it :D hell I even seen some selling their hondata's for it.... no names though.
Just a though.
Just a though.
06-03-2002, 12:18 AM
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Re: The Difference between FPR and FMU? (shadowdawn)
The ems is a very nice solution but its pretty expensive compared to hondata kits. But you gotta add the price of of converting it to obd 1.
06-03-2002, 08:38 AM
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Re: The Difference between FPR and FMU? (int3gra)
AEM EMS is a better solution for us odb2 people cause you DONT have to convert... hondata is way expensive for us because we have to convert etc... ems will plug right in 10 second install :D
06-03-2002, 11:36 AM
#16
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Re: The Difference between FPR and FMU? (shadowdawn)
thanks for the help .. like i had posted before. i just bought my h22 swap so i no way have the money for the AEM .. i heard its like another 1500 bucks..
i think that i am going to keep my FPR and run it with the FMU.. what it seems like the FPR will control me when i am "cruising" not under boost... and when i do boost and i am running the turbo hard... the FMU will jump in and run things for me..
[Modified by KTeller8, 8:45 PM 6/3/2002]
i think that i am going to keep my FPR and run it with the FMU.. what it seems like the FPR will control me when i am "cruising" not under boost... and when i do boost and i am running the turbo hard... the FMU will jump in and run things for me..
[Modified by KTeller8, 8:45 PM 6/3/2002]
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