Afr for power?

[mikaman77]

Hi,first at all sorry my bad english.
I have -89 mkIII(7mge) supra manual with following mods:

K/N fipk
Apexi afc-neo
Plx-devices sm-afr+dm5 (wideband+meter)
custom exhaust
base timing 12`

im starting to tune that safc and i made measurements in highway before i made any adjustments.Car is runnig pretty rich at wot(4000rpms+ ~11.6-->11.0 6500rpms) so, i think that the afr is too rich. Whats the best afr ratio where you make most power in 7mge? i have read that usually most power is made at 12.2:1-->12.6:1 in NA-motors?..:icon_surp

 

[Supracentral]

Hi,first at all sorry my bad english.
I have -89 mkIII(7mge) supra manual with following mods:

K/N fipk
Apexi afc-neo
Plx-devices sm-afr+dm5 (wideband+meter)
custom exhaust
base timing 12`

im starting to tune that safc and i made measurements in highway before i made any adjustments.Car is runnig pretty rich at wot(4000rpms+ ~11.6-->11.0 6500rpms) so, i think that the afr is too rich. Whats the best afr ratio where you make most power in 7mge? i have read that usually most power is made at 12.2:1-->12.6:1 in NA-motors?..:icon_surp

I usually go a bit leaner than that in a NA motor. 13:1 seems to work fairly well for most N/A Supra motors.

 

[mikaman77]

I usually go a bit leaner than that in a NA motor. 13:1 seems to work fairly well for most N/A Supra motors.

i tuned it to around 12.4:1 and heres my afc settings:
2500rpm +2
3000rpm +3
3500rpm -1
4000rpm -3
4500rpm +2
5000rpm -5
5500rpm -10
6000rpm -17
6500rpm -28

well,it really hits rich at close to redline. im just wondering is it safe to tune close to 13:1 at 5500+ rpms? i mean i need pull fuel out around -35 or more close to 6500?.. Knock??