Safe Air / Fuel Ratio For Na Engine

[tacker]

Guys could you please tell me what is considered safe with regards to air / fuel ratio for a NA engine

regards

[Sydneykid]

You have several choices;

Off throttle = injectors closed, so 0 to 1

Partial throttle = 13 to 1

WOT = wherever it makes the most power, usually 13.5 to 1 or thereabouts

Constant throttle = whatever the closed loop aim table says usually 14.7 to 14.9 to 1

Cruise = 15 to 1

Idle = 15.5 to 1

cheers

[NA power]

You have several choices;

Off throttle = injectors closed, so 0 to 1

Partial throttle = 13 to 1

WOT = wherever it makes the most power, usually 13.5 to 1 or thereabouts

Constant throttle = whatever the closed loop aim table says usually 14.7 to 14.9 to 1

Cruise = 15 to 1

Idle = 15.5 to 1

cheers

how did you no that man

[Sydneykid]

how did you no that man

Experience, been tuning N/A engines for a loooong time.

I should add that, there are some lean burn engines that will handle 17 to 1. But I assumed that you were talking about some Skyline engine (RB20/25/26/30) since this is SAU.

cheers

[tacker]

That will do cheers SK