What should my A/F reading be at?

[ScRote20det]

im trying to tune my sr20det with a safc2 intill i can get an enthalpy.....so i was just wondering what my af should be at when idle....i was told 12. also what should it be around when crusing.....and what should it be when in boost?

[herbieS13]

12 at idle!?! holy shit balls thats a rich idle lol, at idle 13.8-14.5 is a pretty safe number, cruising should be in the 13s and boost should be 11.8-12.3ish

[ILoveJDM]

14.5 idle
13.9 cruise
12.5 building into boost
11.5 and under full boost.

this will vary from bolt on mods, all the way to motor porting and ultimately what motor you have. thats a pretty general census

[OBEEWON]

15-16 idle
14.5 cruise
14 tapering down to 13 building into boost
12.5 and under full boost.

this will give you MAXPOWERS and MAXFUELECONOMY


I agree.
:ughd:

[redhatchy92]

i have seen up to 17 idle 15-16 low rpm and 12 under full boost. but that was on a full built dsm. it got pretty good gas milage for a car that put down 500hp on pump lol

[slider2828]

I agree.
:ughd:

Depends on octane as well..... but these are just very very general guidelines....

[zurud]

Is this how nissan ecu work. From my experience in my supra, from idle to 50 % throttle my ecu is in close loop so my afr is 14.7. More than 50% throttle and start building boost it will dip to the ten. I don't understand why nissan with 205 hp get only 370cc injectors. All other turbo cars have big injectors.