Fuel Pressure Regulator
05-11-2004, 07:53 AM
#1
Senior Member
Thread Starter
Join Date: Mar 2003
Posts: 132
My question is, i dont know if it matters but a 90 turbo rx7 with the stock fpr on the secondary fuel rail. When and why does a person need a aftermarket fpr? i was looking in the new modified magazine and that drift car didnt seem to have one and he was pushing 400whp@21 psi but with 4x1000cc injectors. or is a fpr needed when going to really big injectors like 1680cc secondarys and having to get a new fuel rail with the fpr?
Thanks
Thanks
05-11-2004, 09:43 AM
#2
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Join Date: Jul 2001
Location: Tulsa, OK
Posts: 3,346
At that point I feel its really best to put in a fuel pressure gauge to make sure its within specs. I had 850/1200 with a cosmo fuel pump running 18psi on a decent sized turbo, and my fuel pressure was just fine.
05-11-2004, 12:18 PM
#5
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Join Date: May 2004
Location: Dominican Republic
Posts: 3
Hummm, I'm running 12 psi of boost, on stock injectors, K&N Air FIlter and MSD fuel pump; do I need an aftermarket fpr? I was also wondering about lowering to 10 psi as I'm on stock injectors (been thinking about those 720, but then I'd need an S-AFC to manage them......)
Any ideas?
Any ideas?
05-11-2004, 03:26 PM
#6
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Join Date: Jul 2001
Location: Tulsa, OK
Posts: 3,346
Originally Posted by DevilMotorSports' date='May 11 2004, 09:04 AM
Basicly, you want to go aftermarket when you start running higher than stock boost levels.
05-11-2004, 05:49 PM
#7
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Join Date: Oct 2002
Location: Memphis, Japan
Posts: 427
The stock regulator will work fine in every situation I can think of. The only reason I can see to get an aftermarket FPR is if say your injector size is maxed out on the PFC and you need more fuel. At that point a regulator would help.
More importantly than the regulator would be a Fuel Pressure Guage. This will let you know if you pump is big enough to to the job or not......or if the pump is broken.
More importantly than the regulator would be a Fuel Pressure Guage. This will let you know if you pump is big enough to to the job or not......or if the pump is broken.
05-11-2004, 06:32 PM
#8
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Join Date: Oct 2001
Location: Peoria, AZ
Posts: 10,906
Originally Posted by Ranzo' date='May 11 2004, 05:49 PM
The stock regulator will work fine in every situation I can think of. The only reason I can see to get an aftermarket FPR is if say your injector size is maxed out on the PFC and you need more fuel. At that point a regulator would help.
More importantly than the regulator would be a Fuel Pressure Guage. This will let you know if you pump is big enough to to the job or not......or if the pump is broken.
More importantly than the regulator would be a Fuel Pressure Guage. This will let you know if you pump is big enough to to the job or not......or if the pump is broken.
05-13-2004, 11:54 PM
#10
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Join Date: Oct 2002
Location: Memphis, Japan
Posts: 427
Yes the fuel pressure is ever changing. It will increase with boost and decrease in vacuum. If this is not happening then the regulator is broken or the vacuum hose is not connected or has a large tear in it somewhere.
At idle should be setting around 2.8~3kilo......sorry never used PSI for this
It will raise 1kilo for every one kilo of boost.
At idle should be setting around 2.8~3kilo......sorry never used PSI for this
It will raise 1kilo for every one kilo of boost.