Spark blowout below 4k
Re: (dftsilvia)
Weather pending, I'm swapping the fitting tonight. I'm going to buy a bung probably tonight too and try to get that welded in so I can get it tuned this weekend for 14 psi. :pimp: Can I still borrow that wideband?
Re: (articzap)
Will the mods please change title to solved.
I believe I have stumbled on to the reason why so many guys running Walbros run stupid rich. Its all in the bypass fitting.
When I was having problems I had my stock Synapse FPR and my Walbro. In order to get the car to run I needed roughly 38 psi of fuel pressure. I would also get horrible spark blow out, terrible gas mileage and tons upon tons of black smoke. I began by removing fuel with my SAFC. That alone worked wonders but never got it right. Besides, trying to fix an issue with SAFC is just a horrible band aid solution. I knew the problem was fuel now though. So I read through my Synapse directions, and sure enough it says that if you run a Walbro 255, you need to change the bypass fitting to a 2.5mm. So today I got home and began to tear into it. What ***** it is to get the FPR off without taking off the rail. Stupid firewalls. Well I change the fitting and put it back together. First thing I did was start it up and go check my fuel pressure. At idle I was getting 23 psi of fuel pressure. Seemed low but I revved the motor a bit and it shot right up to 38-40 psi. Before when I revved the motor it would shoot to 80 psi. I figured alright the fuel pressure is low, but lets take it out and see if it exhibits the same symptoms as before. I drove around until the car warmed up. The true test was about to come. I put it in first and got the car above 4k and floored it. Still pulled very hard up top, if not harder. My O2 volts were hovering right around .5-.65. Respectable voltage. I then proceeded to give it the true test. At about 10 mph I put it in 2nd gear. I gave it a nice 50% throttle pull. I came up with 7 psi and had just a bit of hesitation. No big deal, the plugs are probably just fooled. Tried it again and all of my issues were gone. The car runs nearly perfect now. All thats left to do is to install drftsilva's wideband and get this beast tuned for 14 psi.
Well your thinking to yourself, I have similar issues but I run a NISMO FPR. If you're running a NISMO FPR with a Walbro 255, you may have something thats not solvable unless you can change the bypass fittings, which I doubt you can, or drill out the bypass to allow more fuel to get past.
Or just buy a real FPR.
I believe I have stumbled on to the reason why so many guys running Walbros run stupid rich. Its all in the bypass fitting.
When I was having problems I had my stock Synapse FPR and my Walbro. In order to get the car to run I needed roughly 38 psi of fuel pressure. I would also get horrible spark blow out, terrible gas mileage and tons upon tons of black smoke. I began by removing fuel with my SAFC. That alone worked wonders but never got it right. Besides, trying to fix an issue with SAFC is just a horrible band aid solution. I knew the problem was fuel now though. So I read through my Synapse directions, and sure enough it says that if you run a Walbro 255, you need to change the bypass fitting to a 2.5mm. So today I got home and began to tear into it. What ***** it is to get the FPR off without taking off the rail. Stupid firewalls. Well I change the fitting and put it back together. First thing I did was start it up and go check my fuel pressure. At idle I was getting 23 psi of fuel pressure. Seemed low but I revved the motor a bit and it shot right up to 38-40 psi. Before when I revved the motor it would shoot to 80 psi. I figured alright the fuel pressure is low, but lets take it out and see if it exhibits the same symptoms as before. I drove around until the car warmed up. The true test was about to come. I put it in first and got the car above 4k and floored it. Still pulled very hard up top, if not harder. My O2 volts were hovering right around .5-.65. Respectable voltage. I then proceeded to give it the true test. At about 10 mph I put it in 2nd gear. I gave it a nice 50% throttle pull. I came up with 7 psi and had just a bit of hesitation. No big deal, the plugs are probably just fooled. Tried it again and all of my issues were gone. The car runs nearly perfect now. All thats left to do is to install drftsilva's wideband and get this beast tuned for 14 psi.
Well your thinking to yourself, I have similar issues but I run a NISMO FPR. If you're running a NISMO FPR with a Walbro 255, you may have something thats not solvable unless you can change the bypass fittings, which I doubt you can, or drill out the bypass to allow more fuel to get past.
Or just buy a real FPR.
Re: (articzap)
nice............
Where can you buy the fittings at?
Where can you buy the fittings at?
Re: (RS12Turbo)
Its included when you buy the FPR. You remove the bottom and install the fitting that has a larger opening.
Re: (articzap)
I feel like a complete newbie but I'll admit my dumbass mistake.
On the Synapse FPR, theres to vacuum ports. One for the FMU and one for the static fuel pressure. I had it hooked up to the FMU port. D'oh. I hooked it up properly and good lord. That fixed my fuel pressure issue too, FYI.
I'm now making 12 psi on the stock wastegate and holding 12psi till around 6500 RPM-7000 RPM. I'm so happy that its finally working properly. 14-16 PSI here I come.
On the Synapse FPR, theres to vacuum ports. One for the FMU and one for the static fuel pressure. I had it hooked up to the FMU port. D'oh. I hooked it up properly and good lord. That fixed my fuel pressure issue too, FYI.
I'm now making 12 psi on the stock wastegate and holding 12psi till around 6500 RPM-7000 RPM. I'm so happy that its finally working properly. 14-16 PSI here I come.
Re: (dftsilvia)
You have spare RB turbos???? What are they, T28's? I wasn't going to do anymore this year but now I might have too.