Odd behaviour, disco potato+b20b.
Thread Starter
1.5 BAR
Joined: Sep 2003
Posts: 708
Odd behaviour, disco potato+b20b.
integra gs b20b, gt28rs, 450cc injectors, resistor box, crome using p72 codebase, advanced boost tools+.
ngk heat range 7 plugs, gapped to 30 thousandths
AFRs are fine, 10-12, timing is retarded using the step retard script.
checked timing, it's a solid 16 degrees. changed map sensor, checked TPS, checked wastegate, checked for boost leaks.
here is what happens...
the car is at full boost by 2800rpm, and pulls until 3700ish, and then it starts popping, and will sometimes backfire. when this starts happening, AFRs dip into the 10s. this will happen no matter how much throttle. the less throttle, the less violent it is, even if you're at full boost. if you go very light throttle, without building boost, there is no bucking.
I've played with injector settings, fuel correction, timing, duration.
I'll be doing a valve adjustment and checking the cam timing in the morning, but what else should I do? I need ideas.
ngk heat range 7 plugs, gapped to 30 thousandths
AFRs are fine, 10-12, timing is retarded using the step retard script.
checked timing, it's a solid 16 degrees. changed map sensor, checked TPS, checked wastegate, checked for boost leaks.
here is what happens...
the car is at full boost by 2800rpm, and pulls until 3700ish, and then it starts popping, and will sometimes backfire. when this starts happening, AFRs dip into the 10s. this will happen no matter how much throttle. the less throttle, the less violent it is, even if you're at full boost. if you go very light throttle, without building boost, there is no bucking.
I've played with injector settings, fuel correction, timing, duration.
I'll be doing a valve adjustment and checking the cam timing in the morning, but what else should I do? I need ideas.
Thread Starter
1.5 BAR
Joined: Sep 2003
Posts: 708
Re: Odd behaviour, disco potato+b20b.
update:
checked the timing belt, it was very loose. fixed that, re-timed, same issue.
I loaded up a few different maps, played with timing, and the bucking got worse.
tried a different ecu, same thing.
I'm wondering if I'm screwing up somewhere with crome. does someone feel like making me a basemap?
1.5 BAR
Joined: Feb 2004
Posts: 1,039
Re: Odd behaviour, disco potato+b20b.
Originally Posted by warrick
new cap and rotor, new plugs, wires, different ignitor and coil. same stuff. getting a new dizzy in tomorrowish.
i'm 95% sure its the coil and or ignitor; try swapping that out and that doesnt fix it then... umm.. something's bad wrong
Thread Starter
1.5 BAR
Joined: Sep 2003
Posts: 708
Re: Odd behaviour, disco potato+b20b.
tried uber, and it ran leaner (13:1 in boost) and still popped. started at the same rpm too.
tried leaning out in chrome, still happened.
tried playing with timing too, still nothing.
tried leaning out in chrome, still happened.
tried playing with timing too, still nothing.
