*UPDATE: Hooked up fuel pressure gauge* Runing lean at top of RPM before shifting
#45
Voltage is fine, curious about the commanded EQR changing between 6036RPM and 6048RPM. In my '98 calibration, the PE EQ Ration columns are in 400RPM increments. These scans were all with the same calibration?
First photo, 5854RPM, EQ ratio commanded 0.89, AFR transform reading lean at 13.66, voltage 13.60V
Second photo, 6048RPM, EQ ratio commanded 0.89, AFR transform reading lean at 13.66, voltage 13.60
Last photo, 6036RPM, EQ Ratio commanded 0.87, AFR transform reading rich at 12.07, no voltage
First photo, 5854RPM, EQ ratio commanded 0.89, AFR transform reading lean at 13.66, voltage 13.60V
Second photo, 6048RPM, EQ ratio commanded 0.89, AFR transform reading lean at 13.66, voltage 13.60
Last photo, 6036RPM, EQ Ratio commanded 0.87, AFR transform reading rich at 12.07, no voltage
#47
Thread Starter
Joined: Dec 2008
Posts: 1,177
Likes: 17
From: lancaster, pa
that last run I fattened up the MAF to see if it'd help. it somewhat did but it totally bumped up the 9K curve which isn't supposed to be like that. it caused the 8K to go from 12.x to 11.x to transition over to the 9K to compensate the leaning out issue.
after this nor'easter flies through i'm gonna plan another run with a fuel pressure gauge and logging it. I'm thinking about swapping back to the stock injectors, should I do that as well?
after this nor'easter flies through i'm gonna plan another run with a fuel pressure gauge and logging it. I'm thinking about swapping back to the stock injectors, should I do that as well?
#49
Thread Starter
Joined: Dec 2008
Posts: 1,177
Likes: 17
From: lancaster, pa
I'm prolly about 350-400 feet above sea level according to googling my location.
edit-the fuel pressure reading wont be til prolly next week after this nor'easter comes and goes. I did change my fuel filter last night in the mean time. blew through it and felt no restrictions as it felt the same as the new one.
edit-the fuel pressure reading wont be til prolly next week after this nor'easter comes and goes. I did change my fuel filter last night in the mean time. blew through it and felt no restrictions as it felt the same as the new one.
#50
I'm prolly about 350-400 feet above sea level according to googling my location.
edit-the fuel pressure reading wont be til prolly next week after this nor'easter comes and goes. I did change my fuel filter last night in the mean time. blew through it and felt no restrictions as it felt the same as the new one.
edit-the fuel pressure reading wont be til prolly next week after this nor'easter comes and goes. I did change my fuel filter last night in the mean time. blew through it and felt no restrictions as it felt the same as the new one.
#51
Thread Starter
Joined: Dec 2008
Posts: 1,177
Likes: 17
From: lancaster, pa
thanks for the verification on the kPa. is the IPW correct for when running 42.5lb injectors or are they too low?
edit-I also noticed the TPS bar on the gauge display isn't registering? the gauge display I left mostly default and just removed the O2 bars as I wasn't using them.
edit-I also noticed the TPS bar on the gauge display isn't registering? the gauge display I left mostly default and just removed the O2 bars as I wasn't using them.
#52
thanks for the verification on the kPa. is the IPW correct for when running 42.5lb injectors or are they too low?
edit-I also noticed the TPS bar on the gauge display isn't registering? the gauge display I left mostly default and just removed the O2 bars as I wasn't using them.
edit-I also noticed the TPS bar on the gauge display isn't registering? the gauge display I left mostly default and just removed the O2 bars as I wasn't using them.
#54
#55
Thread Starter
Joined: Dec 2008
Posts: 1,177
Likes: 17
From: lancaster, pa
Update. Hooked up the fuel pressure gauge and did a few pulls. Definitely losing fuel pressure above 75-80% throttle. Steady pressure at idle and cruise at 55psi but once i romp on it the pressure drops to steady 32psi which was around 13.5afr. Here's what i swapped thus far in this thread leading up to hooking up the fuel pressure gauge:
Originally swapped to gtp injectors to run e85 and that was when i noticed the lean issue
Swapped out the used (i know ill get flack for it) walbro 255lph fuel pump back to stock
Replaced the maf with new one but since no change, swapped the original back in
Replaced fuel filter
Installed caspers easy performance fuel pump relay harness
I'm out of ideas. Should i get a new stock fuel pump from parts store or get the racetronix fuel pump upgrade kit?
Originally swapped to gtp injectors to run e85 and that was when i noticed the lean issue
Swapped out the used (i know ill get flack for it) walbro 255lph fuel pump back to stock
Replaced the maf with new one but since no change, swapped the original back in
Replaced fuel filter
Installed caspers easy performance fuel pump relay harness
I'm out of ideas. Should i get a new stock fuel pump from parts store or get the racetronix fuel pump upgrade kit?
#56
Thread Starter
Joined: Dec 2008
Posts: 1,177
Likes: 17
From: lancaster, pa
Is it possible both of the fuel pressure regulator in the oem/stock and walbro fuel pumps went bad? Is it worth replacing it? I did the trap door so itd be easier than dropping the tank.
#57
I've never seen a stock regulator fail without a huge pump behind it. Have you confirmed steady voltage at the pump during a pull? Are you saying youre running e85? I doubt a stock pump is good for 400whp on e85. Not sure on injectors.
#59
Thread Starter
Joined: Dec 2008
Posts: 1,177
Likes: 17
From: lancaster, pa
I unfortunately did not get a log of the run when i how'd up the gauge because the hp tuner errored out whenever i started to record. I imagine it was like the prior scans where it were around 13.5v