Hello everyone,
I am a new to tuning so if I say something incorrect or something that doesn't make sense let me know. Don't bash me for it.
My car is a 2006 gto 6speed. Intake, ls3 Maf, Fast 102/102tb, headers and exhaust (stock cam and valvetrain). Car was tuned by Jeremy Formato of FastProms.
WOT the car is perfectly fine with a proper 12.9:1 afr and no KR* detected on the scanner. Makes great power on the dynojet 412/410 so no complaints there. I have an LC2 wideband hooked up to the car so I can see what's going on with the fueling all the time.
I am a little bit worried about the AFR particularly at start-up(cold) and light cruising. Sometimes at start up the car starts a little rough with some sporadic timing changes/flux (for lack of a better term) and goes away as it warms up. AFR on a cold start is around 14 and when warmed up the wideband will oscillate between 14.9-16 when warm at idle. Cruising around town the car is at 15-16 AFR. To me this feels as if my commanded AFR is 15 even though the VCM editor indicates that the values are set to 1/stoich. Is there a sticky thread that pertains to this? I have already read through the GEN4 tuning stickies and in the past have honed my fuel trims down more or less so I am not completely in the dark about how to go about it but the car just feels weird too me. Jeremy assures me that he honed the fuel trims down but I just don't buy it, when I first attempted to tune this set up I did a much better job at honing down the fuel trims than he according to my wideband and scanner. I will post Datalogs asap
Thanks