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.

Re: Odd behaviour, disco potato+b20b.
 

come on you bastards. fix my problem.

cam timing is fine, replaced the ignitor and coil, as well as threw on some nology hotwires.

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?

Re: Odd behaviour, disco potato+b20b.
 

try a different cap and rotor

ur missfiring and the unburnt fuel is picked up by the wideband even though ur reading rich

Re: Odd behaviour, disco potato+b20b.
 

new cap and rotor, new plugs, wires, different ignitor and coil. same stuff. getting a new dizzy in tomorrowish.

Re: Odd behaviour, disco potato+b20b.
 

i'm having the same problem except not as early in the revs.

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 ;)

Re: Odd behaviour, disco potato+b20b.
 

brand new dizzy and the exact same problems.

come on guys. fix me.

Re: Odd behaviour, disco potato+b20b.
 

it's your settings in chrome. ur just running pig ass rich. the bucking is richness... do something about it, i think ur ------ up in chrome. try using uber or sumthin =x

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.

Re: Odd behaviour, disco potato+b20b.
 

are you using any oter features like ftl? is the eld anabled?