fmu and fpr
#2
Re: fmu and fpr
Originally posted by a33
i have both on my car.....
i am using a 8:1 disc in my fmu and at the same time i am using a fpr.... i want to know what psi the fuel pressure should be at...
i have both on my car.....
i am using a 8:1 disc in my fmu and at the same time i am using a fpr.... i want to know what psi the fuel pressure should be at...
thanks
#3
Re: Re: fmu and fpr
I think it would be rather unlikely to be caused by the FMU; your fuel pressure should be changing regardless how you installed it, as long as it's running. I'd imagine the FMU would simply act as a multiplier for whatever you do with the FPR, or in reverse order... but I've never done anything fuel system related (aside from tinkering with my AFC), so I can't give you a certain answer
What kind of fuel pressure gauge are you running and how/where exactly was it installed? Maybe one of us here can help if we know more about the setup.
What kind of fuel pressure gauge are you running and how/where exactly was it installed? Maybe one of us here can help if we know more about the setup.
Originally posted by a33
i tried adjusting the fuel pressure with the fpr, but the fuel pressure wouldnt go down... would it be beceuse of the fmu???
thanks
i tried adjusting the fuel pressure with the fpr, but the fuel pressure wouldnt go down... would it be beceuse of the fmu???
thanks
#4
Actually, the FMU just keeps the fuel in the rail longer....
The pressure is actually regulated by the Fuel Pressure Regulator (FPR).... not the fmu...what fpr are you using?
The pressure is actually regulated by the Fuel Pressure Regulator (FPR).... not the fmu...what fpr are you using?
#5
im not sure what brand it is.....
but it should be working properly...
what if i take off the fpr and use the 8:1 fmu only?? would my car run lean??? cuz i dont have the extra fuel pump that came with the vortech on my car...
but it should be working properly...
what if i take off the fpr and use the 8:1 fmu only?? would my car run lean??? cuz i dont have the extra fuel pump that came with the vortech on my car...
#6
you wouldn't even start your car because you'd flood your motor. The FMU only controls fuel when there is no longer vacuum. So leave your fpr there... you should be at about 34 psi of fuel at idle, what are you at now?
If you don't have the extra fuel pump, you're running lean right now.... let me know if you need it, I have a spare laying around.
If you don't have the extra fuel pump, you're running lean right now.... let me know if you need it, I have a spare laying around.
#8
jesus.... 75 psi... SUPER RICH hehe...
yeah sounds like you're fpr is F#$@#!.
As of now, you may be better off running the oem fpr... at least then you won't be running so damn rich hehe... but it sounds like you're fpr is shot.
yeah sounds like you're fpr is F#$@#!.
As of now, you may be better off running the oem fpr... at least then you won't be running so damn rich hehe... but it sounds like you're fpr is shot.
#9
Re: fmu and fpr
Originally posted by a33
i have both on my car.....
i am using a 8:1 disc in my fmu and at the same time i am using a fpr.... i want to know what psi the fuel pressure should be at...
i have both on my car.....
i am using a 8:1 disc in my fmu and at the same time i am using a fpr.... i want to know what psi the fuel pressure should be at...
#10
Because: He's got a Vortech FMU, I'm not familiar with how the cartech operates.
The FMU controls fuel while on boost by keeping more fuel in the fuel rail, but does not operate while NOT on boost.
The FPR is the only thing that controls fuel when OFF boost by maintaining the fuel pressure. The fpr alone CANNOT give the correct amount of fuel under boost.
The FMU controls fuel while on boost by keeping more fuel in the fuel rail, but does not operate while NOT on boost.
The FPR is the only thing that controls fuel when OFF boost by maintaining the fuel pressure. The fpr alone CANNOT give the correct amount of fuel under boost.
#11
Originally posted by seximagtr
Because: He's got a Vortech FMU, I'm not familiar with how the cartech operates.
The FMU controls fuel while on boost by keeping more fuel in the fuel rail, but does not operate while NOT on boost.
The FPR is the only thing that controls fuel when OFF boost by maintaining the fuel pressure. The fpr alone CANNOT give the correct amount of fuel under boost.
Because: He's got a Vortech FMU, I'm not familiar with how the cartech operates.
The FMU controls fuel while on boost by keeping more fuel in the fuel rail, but does not operate while NOT on boost.
The FPR is the only thing that controls fuel when OFF boost by maintaining the fuel pressure. The fpr alone CANNOT give the correct amount of fuel under boost.
#14
Originally posted by MAXIN
- http://www.cartech.net/fmu2020.htm
Looks like the cartech fmu does not adjust base fuel pressure at idle, only overides fpr when under boost or full throttle. Unless im reading wrong
- http://www.cartech.net/fmu2020.htm
Looks like the cartech fmu does not adjust base fuel pressure at idle, only overides fpr when under boost or full throttle. Unless im reading wrong
#15
i am actually running fine now....
fuel pressure is still crazy... but i used my afc to turn it down at idle.....
so should i take out the fpr and use the fmu only????? or should i take out the fmu and use the fpr only and use the afc to give it more fuel during boost??
fuel pressure is still crazy... but i used my afc to turn it down at idle.....
so should i take out the fpr and use the fmu only????? or should i take out the fmu and use the fpr only and use the afc to give it more fuel during boost??
#16
Originally posted by a33
i am actually running fine now....
fuel pressure is still crazy... but i used my afc to turn it down at idle.....
so should i take out the fpr and use the fmu only????? or should i take out the fmu and use the fpr only and use the afc to give it more fuel during boost??
i am actually running fine now....
fuel pressure is still crazy... but i used my afc to turn it down at idle.....
so should i take out the fpr and use the fmu only????? or should i take out the fmu and use the fpr only and use the afc to give it more fuel during boost??
say 8psi of boost with 8:1 disc...this is how you get the fuel pressure at 8psi.
8psi * 8 + idle pressure/2
are you saying you are running 75psi at WOT? if so, that sounds normal.
I dont think your car will run lean with an 8:1
and never take out the FMU.
#18
i am running 75 psi at idle...
that is the problem...
so should i just take out the fpr instead???
would my car run fine with the fmu only????
and i am not sure if i put the 8:1 disc in properly....
and i should be running 9 psi of boost...
that is the problem...
so should i just take out the fpr instead???
would my car run fine with the fmu only????
and i am not sure if i put the 8:1 disc in properly....
and i should be running 9 psi of boost...
#20
Originally posted by a33
i am running 75 psi at idle...
that is the problem...
so should i just take out the fpr instead???
would my car run fine with the fmu only????
and i am not sure if i put the 8:1 disc in properly....
and i should be running 9 psi of boost...
i am running 75 psi at idle...
that is the problem...
so should i just take out the fpr instead???
would my car run fine with the fmu only????
and i am not sure if i put the 8:1 disc in properly....
and i should be running 9 psi of boost...
the FMU should affect idle fuel pressure. have you try to boost and see what kinda fuel pressure you are getting? just rev it up, dont run it
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