ok, i finished putting the car back together and hooked up the fp guages, to set the fmu. I had the vacuum lines disconnected and the cartech was reading 75, so i started screwing the alen stud out and it went down to 60, and stayed at 60, with the stud half way or all the way out it was still at 60 psi. When i plugged in the vacuum line, it only dropped to 55. The car seems to be idling great. But this is way to much fuel pressure What could be wrong, cartech 2025 or the 2027, i think its the 2025. looks exactly like this
What could be wrong? it is hooked up corectly, and i dont have a check valve on the bleed part.
Emry
96 Camaro A4 383 12.5:1, E85, Full suspension, Nitrous outlet plate kit, hooker headers and catback, 3800 circle D converter.
2002 Silverado LQ4 6.0 CAI, Long tube headers, 4" exhaust
1996 s10- 97 ECU and wiring, soon to be boosted daily driver.
I'm having the same problem. How is the car running? Mine is bogging out on me in the upper rpm's.
if your still using the stock fpr , it will stop at the setting of the stock fpr
i am running the stock fpr. Stevefire said he was pretty sure it was because i did NOT have a check valve hooked up, i didnt believe him but i read my cartech manual again and it says "Two functions are accomplished by the check valve. One, the simple plugging of a small vacuum/boost leak. Second, vacuum is required to pull the preload spring under the center screw away from the valve so stock fuel pressures can be achieved under manifold vacuum conditions." so i will try this and post back, cartech information can be found here
Cartech Racing
Hope it works
Emry
96 Camaro A4 383 12.5:1, E85, Full suspension, Nitrous outlet plate kit, hooker headers and catback, 3800 circle D converter.
2002 Silverado LQ4 6.0 CAI, Long tube headers, 4" exhaust
1996 s10- 97 ECU and wiring, soon to be boosted daily driver.
you wont be able to lower the fuel pressure below the stock fpr
if you get a adjustable fpr to replace it youll be able to lower the fuel pressure , but not untill then
or take the stock 1 out and use the fmu to drop the pressure and the small adjustment to bring it back up
i havent checked the shim yet, if it is dimpled where can i get one? does it have to come strait from cartech? Out of curiosity, what is a good base pressure to start with at idle, i was thinking around 35..
Emry
96 Camaro A4 383 12.5:1, E85, Full suspension, Nitrous outlet plate kit, hooker headers and catback, 3800 circle D converter.
2002 Silverado LQ4 6.0 CAI, Long tube headers, 4" exhaust
1996 s10- 97 ECU and wiring, soon to be boosted daily driver.
i dont know if anyone mentioned butwith the vacuum line off you are tuing for atmospheric pressure... or 0 vac
with the line on you wouldnt be tuning anything..
thats how the cartech works according to corkey bell himself when I called.
top screw is for atmospheric adjustment, side need valve is for ratio gain
LE61T PTE6262 Powered 
the base fuel pressure really depends on ALOT OF VARIABLES
injector size , and what your using to control the injectors
ie... stand alone , safc , stock computer
if your running stock injectors then the stock fpr setting is what you will need for base fuel pressure , any lower and your going to lean it out
and you want to set the base fuel pressure so that the car runs properly off boost , and maintains a good a/f ratio
once that is done then you can tune the fmu for the boost
ok, so installed checkvalves, nothing improved. I decided to tear into it and see about that shim. Yes it was dimpled, but not real bad, it wasnt torn or anything, so i flipped it upside down. Same thing, I dont know what to do. The onlything i can really even think is that make the stock fpr is stuck...Any input?
Emry
96 Camaro A4 383 12.5:1, E85, Full suspension, Nitrous outlet plate kit, hooker headers and catback, 3800 circle D converter.
2002 Silverado LQ4 6.0 CAI, Long tube headers, 4" exhaust
1996 s10- 97 ECU and wiring, soon to be boosted daily driver.
Emry wrote:I dont know what to do.
Maybe you should pull your head out of your ass and listen to what people that know a lot more then you are telling you. Go read the above replies, there are several that you didn't even acknowledge. If you ask for help on here, at least ACKNOWLEDGE them! If you think they are incorrect, go ahead and say so. Of course in this case, the people that replied to you above know what they are talking about.
yeah im cool, my names bob im an @$$hole. Im sick and tired of people being dicks on here. Really, one guy left a post that maybe you should check this, the post led to almost the same problem, that has to do with the shim, i checked it. One guy said try a check vales on the vent...i did.
I had the vacuum line off to do the atmospheric pressure and i couldnt get it lower then 60 psi, as QBE had stated, when you plug the vac line back in, it should have dropped down near stock figures, it only stroped a few psi. I have listened and i have tried things people have said. When somthing didnt work i posted.
Now as 97cavi24ls said that base fuelpressure depends on injectors, and stock or aftermarket fpr. I have stock injectors, and a stock fpr, i didnt see a reason why i would need an afpr to control stock injectors, if im wrong here then somone please tell me.
Bob, you should have just said "I think you should review some of the posts people have left you" ok, but instead you had to post like that?. Grow up man im not even 18 and i think im more mature then you are. Or maybe i took your post wrong and you were trying to say that in a nice way if thats possible.
And thanks to everyone that has been giving me things to look for, Im beging to think that my stock fpr is stuck.
Emry
96 Camaro A4 383 12.5:1, E85, Full suspension, Nitrous outlet plate kit, hooker headers and catback, 3800 circle D converter.
2002 Silverado LQ4 6.0 CAI, Long tube headers, 4" exhaust
1996 s10- 97 ECU and wiring, soon to be boosted daily driver.
most of the stock fpr work in the 40-60 range , depending on year
from what you have said that i understand , your system is fuctioning NORMAL
the FMU is only going to boost the fuel pressure above the stock fpr's setting
NOT LOWER
its a '97 2.2. really that high is normal? hmm i was expecting it to be around 35-45. My plugs are very very dark brown. would it be safe to buy a afpr and set it at 40-45?
Thanks
Emry
96 Camaro A4 383 12.5:1, E85, Full suspension, Nitrous outlet plate kit, hooker headers and catback, 3800 circle D converter.
2002 Silverado LQ4 6.0 CAI, Long tube headers, 4" exhaust
1996 s10- 97 ECU and wiring, soon to be boosted daily driver.
40 is the low minimum for the fuel pressure , or should be on yours
there isnt much sense in droping the fuel presusre if the car runs off boost just fine
a adjustable fpr is only needed when you add larger injectors , so you can run better off boost
read my reply so you know... that will help
I helped a few people on here who were tuning their cartech backwards one kid shaggy2m0 noticed a huge improvement
LE61T PTE6262 Powered
