lookforjoe
True Classic
OK. I have one of Matt's 35/75 cams, milled cam box, locally milled (.075") & ported head.
Cam timing * stock position. AFM wheel in stock setting. CO adjust full rich setting. Ignition timing * 12ºbtdc. Bosch Platinum WR7DP * .028" 3bar FPR, injectors flushed & flow tested (186cc*3bar)
Now that I have the wideband O2, I can see that the AFR's are good at idle; 14.6-15.2 and cruising. However, under part load they stay in the high to mid 14's - only dropping to high 12's- low 13's under close to full throttle, over 5000rpm.
So, my question is, what target AFR should I be shooting for? I'm used to tuning for boost, not natural aspiration. The car feels good, but I'm used to seeing AFR's below 13.5 under load conditions. 14's seems to high, even for a NA setup?
EDIT: Does anyone have the ignition graph for the stock electronic ignition?
Cam timing * stock position. AFM wheel in stock setting. CO adjust full rich setting. Ignition timing * 12ºbtdc. Bosch Platinum WR7DP * .028" 3bar FPR, injectors flushed & flow tested (186cc*3bar)
Now that I have the wideband O2, I can see that the AFR's are good at idle; 14.6-15.2 and cruising. However, under part load they stay in the high to mid 14's - only dropping to high 12's- low 13's under close to full throttle, over 5000rpm.
So, my question is, what target AFR should I be shooting for? I'm used to tuning for boost, not natural aspiration. The car feels good, but I'm used to seeing AFR's below 13.5 under load conditions. 14's seems to high, even for a NA setup?
EDIT: Does anyone have the ignition graph for the stock electronic ignition?