Thread: adjusting maf

Bob,

on the 14CUX, the higher the number, the richer it is. 0.9 to 1.1 are pretty much factory, uo to 1.8 with a decent cam, I find 1.5 a good compromise. BUT, some systems/ engines will respond differently to others due to wear and tear etc, so adjust yours to suit.

JC

Originally Posted by justinc

Bob,

on the 14CUX, the higher the number, the richer it is. 0.9 to 1.1 are pretty much factory, uo to 1.8 with a decent cam, I find 1.5 a good compromise. BUT, some systems/ engines will respond differently to others due to wear and tear etc, so adjust yours to suit.

JC

Thanks Justin, thats what I thought it was. Now to have some fun playing around. Bob

Don't forget this "pot" varies the mixture by varying the injector timing across the entire fuel map by a fixed amount.

Therefore in reality the only place you will notice any change in air/fuel ratio is at idle/low revs/low load. The variance in injector timing in proportion to injector timing associated with richer sections of the fuel map ie under load/wider throttle, is too small to be noticable.

Rule of thumb voltage of say 1.3 volts is helpful but a gas analyser is recommended for setting the "pot".

For example a MAF that is on the way out and producing often a higher voltage or richer air signal may require a pot voltage of say 0.1 volts or nearly zero to produce a optimum AFR of say 2.5% CO. Alternatively some after market MAF's produce a lower or leaner air signal voltage than the OEM MAF and require a higher or richer pot voltage to the extent anything less than 1 volt is dangerously lean.