Ok, I know that the oem stock ka fuel press regulator is a 1:1 ratio unit.Basically for every one pound of boost detected, the fpr will add one pound of fuel pressure.Here is my question, will this fpr be stable and efficient at ~15psi of boost..?? Or am i gonna need an aftermarket one..??
Im currently pushing 10 psi of boost on this stock fpr and stock fuel pump. In theory my fuel pump is only pushing ~53.5 psi of fuel pressure at 10 pounds of boost.. Im waiting on my fuel pressure gauge to verify this...
Anyways, to get to the point, do u think the oem unit will be efficient and or stable at ~15 psi...??
ThanksRobert
OEM fpr question:
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rn240sx
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Re: (NateDogg)
Let me say this again...
Stock fuel pump with stock fpr (1:1) ratio. Stock fuel pressure is at 43.5 psiIf im pushing 10 psi, then the fpr should add 10 psi of fuel pressure cause of the (1:1) ratio, giving me 53.5 psi of total fuel pressure under 10 pounds of boost.The stock fuel pump CAN handle 53.5 psi of fuel pressure. For how long, I dont know, but Ive been running this setup for well over a year now with zero problems. HOWEVER, I have noticed that I start to go lean up around mid 4th gear, so thats when i back off or simply drop down to 8 psi.. Maybe thats due to the fact that i MAY be stressing out the fuel pump as its trying to push that much and eventually its giving away after a couple of seconds.. ORMaybe the fuel pump IS pumping 53.5 psi solid all the way without stressing out and its just the fact that i need MORE fuel as the power increases..
The dyno i used did NOT have the AFR's.. It was a low cost dyno. (thats what the owner said, i never heard of a dyno with NO program for the air fuel ratio, but it costed very little to me, so i took advantage)
When I ran it at 14psi... We did put in a walbro and upgraded the fuel system, this was a one time run just to see if the motor would handle the 14 pounds..
Stock fuel pump with stock fpr (1:1) ratio. Stock fuel pressure is at 43.5 psiIf im pushing 10 psi, then the fpr should add 10 psi of fuel pressure cause of the (1:1) ratio, giving me 53.5 psi of total fuel pressure under 10 pounds of boost.The stock fuel pump CAN handle 53.5 psi of fuel pressure. For how long, I dont know, but Ive been running this setup for well over a year now with zero problems. HOWEVER, I have noticed that I start to go lean up around mid 4th gear, so thats when i back off or simply drop down to 8 psi.. Maybe thats due to the fact that i MAY be stressing out the fuel pump as its trying to push that much and eventually its giving away after a couple of seconds.. ORMaybe the fuel pump IS pumping 53.5 psi solid all the way without stressing out and its just the fact that i need MORE fuel as the power increases..
The dyno i used did NOT have the AFR's.. It was a low cost dyno. (thats what the owner said, i never heard of a dyno with NO program for the air fuel ratio, but it costed very little to me, so i took advantage)
When I ran it at 14psi... We did put in a walbro and upgraded the fuel system, this was a one time run just to see if the motor would handle the 14 pounds..