Alright guys I have search for over two days. I finally decided to make a post about this.
I am trying to tune my car and I noticed that my AFR is at dangerous levels. For mods I have AGP return with an aeromotive FPR, Bottle neck fix, 750cc injectors and S2 with a SAFC II. I am trying to tune a 60trim.
I cranked it to 21psi and I went to 14:1 at 5400 rpms. Keep in mind the sAFC are 0 across. So I let off. I check to see if there was a enough pressure. The pressure drops as I am building boost, but only at around 3800 rpms. Also when I turn off the car the gauge drops to zero in about 2 seconds.
Next issue related to the above one. I bought the car used. with the Return and such. The previous owner had supposedly had the 255lph pump installed yet when I did the bottle neck mod, I felt that the pump was never touched even the tabs on the canister looked unmolested,
I got these #s from the pump, I am not sure if its a rebuilt stock one with a 255 gut or a real 255 or its simply the stock one.
P/n 05290251aa
F20000142
33703-2s
pat 4500270 5421306
Is there a check valve on the pump that has gone bad, that might cause pressure relieve when I turn the car off. Or are the chances high that the stock pump is still in there. Also does the old FPR affect pressure even if I am not using it at all, since I have the bottle neck mod.
Alright guys I have search for over two days. I finally decided to make a post about this.
I am trying to tune my car and I noticed that my AFR is at dangerous levels. For mods I have AGP return with an aeromotive FPR, Bottle neck fix, 750cc injectors and S2 with a SAFC II. I am trying to tune a 60trim.
I cranked it to 21psi and I went to 14:1 at 5400 rpms. Keep in mind the sAFC are 0 across. So I let off. I check to see if there was a enough pressure. The pressure drops as I am building boost, but only at around 3800 rpms. Also when I turn off the car the gauge drops to zero in about 2 seconds.
Next issue related to the above one. I bought the car used. with the Return and such. The previous owner had supposedly had the 255lph pump installed yet when I did the bottle neck mod, I felt that the pump was never touched even the tabs on the canister looked unmolested,
I got these #s from the pump, I am not sure if its a rebuilt stock one with a 255 gut or a real 255 or its simply the stock one.
P/n 05290251aa
F20000142
33703-2s
pat 4500270 5421306
Is there a check valve on the pump that has gone bad, that might cause pressure relieve when I turn the car off. Or are the chances high that the stock pump is still in there. Also does the old FPR affect pressure even if I am not using it at all, since I have the bottle neck mod.
without a doubt the Fuel line you used when doing the Bottleneck fix has burst. No question at all. you need to get some high quality fuel line. I have had mine go twice now. No doubt that is your problem also, drop the tank pull the pump and you will see just what i am talking about.
So you think it is an internal leak, at the canister. thats why i am unable to see the leak outside.
That sounds like a problem, problem 2 is this damn pump. Should I just spend the money and buy another 255 HP.
Quote: Originally Posted by benmcc2003
Quote: Originally Posted by ricardoa1
Alright guys I have search for over two days. I finally decided to make a post about this.
I am trying to tune my car and I noticed that my AFR is at dangerous levels. For mods I have AGP return with an aeromotive FPR, Bottle neck fix, 750cc injectors and S2 with a SAFC II. I am trying to tune a 60trim.
I cranked it to 21psi and I went to 14:1 at 5400 rpms. Keep in mind the sAFC are 0 across. So I let off. I check to see if there was a enough pressure. The pressure drops as I am building boost, but only at around 3800 rpms. Also when I turn off the car the gauge drops to zero in about 2 seconds.
Next issue related to the above one. I bought the car used. with the Return and such. The previous owner had supposedly had the 255lph pump installed yet when I did the bottle neck mod, I felt that the pump was never touched even the tabs on the canister looked unmolested,
I got these #s from the pump, I am not sure if its a rebuilt stock one with a 255 gut or a real 255 or its simply the stock one.
P/n 05290251aa
F20000142
33703-2s
pat 4500270 5421306
Is there a check valve on the pump that has gone bad, that might cause pressure relieve when I turn the car off. Or are the chances high that the stock pump is still in there. Also does the old FPR affect pressure even if I am not using it at all, since I have the bottle neck mod.
without a doubt the Fuel line you used when doing the Bottleneck fix has burst. No question at all. you need to get some high quality fuel line. I have had mine go twice now. No doubt that is your problem also, drop the tank pull the pump and you will see just what i am talking about.
might be your fuel pressure regulator... I bought my fuel return line used and it had a bum fuel pressure regulator that i recently just found. My car would lose pressure in a about 1-2 seconds after turning it off. When I would rev the car via the throttle body, I could watch the fuel pressure drop.
I had a hard time getting a consistent tune with my dtec as well. One pull I'd be at a 11.5 a/f ratio, the next pull, 12.0, then the 3rd pull 11.2... Once I put in a new regulator last weekend everything has been working properly...
might be your fuel pressure regulator... I bought my fuel return line used and it had a bum fuel pressure regulator that i recently just found. My car would lose pressure in a about 1-2 seconds after turning it off. When I would rev the car via the throttle body, I could watch the fuel pressure drop.
I had a hard time getting a consistent tune with my dtec as well. One pull I'd be at a 11.5 a/f ratio, the next pull, 12.0, then the 3rd pull 11.2... Once I put in a new regulator last weekend everything has been working properly...
i've been having the same problems as that. my pressure was bleeding down realliy fast. well now when i turn the car off it takes a few minutes but it still bleeds down, which means there's a leak. hopefuly this weekend i can figure out what's up with mine. im thinking it's either the checkvalve in the fuel pump is bad(so i picked up a new one to try out), the bottleneck is leaking inside the canister or the fpr is bad.
now did you go out and buy a new fpr or did you get it covered somehow by aeromotive?
Yea definately check that fuel line for the bottleneck, it makes a lot of sense that that could be the problem. And honestly about the pump, I would just get a new one, its $100 and for the safety of your car and sleeping better at night, its a very cheap insurance!
The stock pump is a Walboro 190lph and it will say that on the pump.
The only thing that was on the pump were those numbers. Maybe its an early 04 stock pump. Or maybe the aftermarket walboro 255 were just rebuilt stock unit back in the day. I dont know I am still trying to find out.
I also noticed that the return system is not an AGP set up, Unless this is how they set it up back in the day.
The return goes into the cap of fuel sender/pump module, and not onto an adaper on the filler tube, unlike aarons or the current AGP. Is this a bad set up, and does anyone know who makes a kit like this.
This car was one of the early big turbo cars when Big turbos were a new thing.
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Fuel pressure problems, bleeds down. Fuel Pump?
at 5400 rpms. Keep in mind the sAFC are 0 across. So I let off. I check to see if there was a enough pressure. The pressure drops as I am building boost, but only at around 3800 rpms. Also when I turn off the car the gauge drops to zero in about 2 seconds. 
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