WAY too rich
#21
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Dude, here's your hat. Now sit in the corner.
BTW, you didn't feel that that was critical information you should have included in the very first post?
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Last edited by Ben; 10-08-2007 at 05:44 PM.
#24
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I agree with you; o2 feedback is ignored at full throttle. However your problem is that you're cruising too rich. Because you're not running an o2 sensor. Because it's dangling in fresh air.
#26
I disagree with that statement. Main problem is you're telling the ECU to **** off by sending it completely wrong readings in closed loop. You're throwing it so much fuel in closed loop that it would take more than a blip of WOT to clear it out...who knows, you might even be blowing out spark it is so rich. And you know what? You can (and should) be boosting while not WOT.
Deal with known problems before trying to diagnose other, related issues.
Deal with known problems before trying to diagnose other, related issues.
#27
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alright then guys, can i leave the corner long enough to weld in another 02 bung in my downpipe? i was doing some 1st through 3rd gear runs and was just pegged rich the whole time
#28
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I think your main problem right now is cylinder wash.
After that, your plugs and wb sensor are getting crudded up.
Tuning the FMU is really pretty easy. I continue to encourage you to ignore the (inpercise and fairly irrelevant) fuel pressure gauge and tune by (highly accurate and extremely relevant) wideband only... But I guess I like to talk to walls.
I might know a thing or two about tuning an FMU, so you may want to listen
That was with a BEGi FMU, 190lph hp, 1.8 injectors, and 9-10 psi
After that, your plugs and wb sensor are getting crudded up.
Tuning the FMU is really pretty easy. I continue to encourage you to ignore the (inpercise and fairly irrelevant) fuel pressure gauge and tune by (highly accurate and extremely relevant) wideband only... But I guess I like to talk to walls.
I might know a thing or two about tuning an FMU, so you may want to listen
That was with a BEGi FMU, 190lph hp, 1.8 injectors, and 9-10 psi
#30
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i have returned back to my corner, but heres an update
i havent been tuning by fuel pressure at all, the only time i even looked at the guage was to make sure it wasnt adding fuel in vac and adding too much in boost.
well i put in the other o2, i set the afm back to the stock tension (i actually marked it) cruise is about 12.5-13:1 now. still about 10.5:1 under full boost pulls. feels a tad stronger now, pulled up to 85 decent. and i have the check valve in the line going from the intake to the FMU to act as a restector.
i havent been tuning by fuel pressure at all, the only time i even looked at the guage was to make sure it wasnt adding fuel in vac and adding too much in boost.
well i put in the other o2, i set the afm back to the stock tension (i actually marked it) cruise is about 12.5-13:1 now. still about 10.5:1 under full boost pulls. feels a tad stronger now, pulled up to 85 decent. and i have the check valve in the line going from the intake to the FMU to act as a restector.
#32
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but, my dumbass didnt put lock washers on the turbo hardware, so i have to make a trip to home depot tomorow anyway.
#35
the bleeder valve only sets an upper limit on the boost that the FMU sees. If you had had the check valve in so that it saw boost but not vac, then the fmu would raise fuel pressure the first time it saw boost, but wouldn't return to normal during engine vacuum conditions, thus "trapping" boost
#36
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I don't think it would trap boost since the needle valve vents to atmo. I think it would trap to atmo pressure though.
How's the UEGO sensor looking? Is it coated black? I know those NGK sensors don't get calibrated like the Bosch sensors do, but I do seem to recall reading something about an AEM UEGO calibration procedure somewhere. I'd look into that if I were you.
Sam & Scott both ran 305 cc/min injectors off their stock ecu's without incident. Granted, Sam's car has sequential injection, but Scott's car doesn't.
How's the UEGO sensor looking? Is it coated black? I know those NGK sensors don't get calibrated like the Bosch sensors do, but I do seem to recall reading something about an AEM UEGO calibration procedure somewhere. I'd look into that if I were you.
Sam & Scott both ran 305 cc/min injectors off their stock ecu's without incident. Granted, Sam's car has sequential injection, but Scott's car doesn't.
#38
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the sensor is pretty damn black now. i could try and spray some electronics cleaner on it, but it is responding. i have had the check valve pre-fmu and post bleeder, the fmu worked the same both times.
#39
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ok guys made some progress today. put a TINY restictor in the vac line going to the fmu. its actually a tad smaller than a wd-40 straw. i glued it inside a inline connector and it seems to have helped. idle is about stoich, 40-50mph cruise is still on the rich side, but not horible. managed to get boost leaned out with that restrictor. starts about 12.5, then 4500rpm or so hits about 11.5 and about 5500-6000rpm till redline hits 10-10.5. that looks like about the best im going to do with a FMU. looks like the restrictor was the biggest thing i was missing. the hole the air passes through is now about the width of a straight pin. and i managed to put a hurting on aredneck in a 3rd gen T/A, thats always a good thing. the car feels about as strong as it was on the 75shot of zex on the butt dyno.