Help solve my knock issue

[iron bird]

log attached i need help solving horrible knock.

 

[JayRolla]

What mods, only gm maf? What boost? Need a little more info. With what I can say it looks like too much timing at high rpms since you probably have the boost turned up or a lean condition due too a bad tune with the gm maf.

 

[iron bird]

stock maf, 15 psi, fuel pump rewire, 3" turbo back, im replacing my plugs too, there probly bad causing a bit to when my ecu fried my car ran super rich.

 

[JayRolla]

Are you sure boost is staying at 15psi, is it creeping higher due too the exhaust? You still may have too much timing for boost especially on 91 or less octane.

 

[iron bird]

93 octane only, not creeping im vented to 02,

 

[turboglenn]

well, I wont' trust the stock o2 reading any further than to say that you do lean out from your richest point around 5k (where the knock starts) and continue to lean towards redline as knock picks up.

also, airflow is erratic and your probably just pushing a ton of hot air into the engine (the reading in the log is at the MAF right?)

So all in all, I see you leaning out right when the knock starts (injector pulse dips from the peak21ms and falls steadily),while running out of flow from the turbo or engines breathing setup making the air super hot on top of the lean'ness and you're asking for knock... Do you have any wideband readings? i'd say you're in need of some upgrades in the cam, turbo and fuel departments

I know you're only asking to get rid of the knock on the setup you have, but it may be the setup at the levels you're trying to run that's causing your knock... AT the least it needs a tune put on it that can keep the AFR's right after 5100RPM

 

[JayRolla]

Agreed, turn down boost to 10-12psi till you have fuel management and a WBo2 too read the airfuel ratio.

 

[red1993gsallmt]

do you get knock in every gear?

 

[iron bird]

its fixed guys sorry i didnt post back new spark plugs and every thing was fine