so...

whats the correct air/fuel on a 04 f-150 3v supercharged..

right now...

idle (IN PARK) is 15.5 avg.

haven't taken on road to see what wot is...yet

thanks

so what should ..

wot be
idle (in park)
crusing (55mph)


thanks

 

Mine with stock whipple tune

Idle: 14.7
Cruise 14.7 or some throttle around 14ish
WOT 10.x

VMP and Troyer tune

Idle: 14.7
Cruise: again 14.7 with around 14ish depending on pedal it will dip into the 13s or 12s.
WOT: 11.3 to 11.8

 

thanks

and to be sure.. the higher the number the less fuel and more air..
as 10.0.. is rich and 16.0 would be lean?

 

yes

 

A stoich ratio of 14.67:1 is considered perfect. However if there are oxygenators such as MTBE (methyl tert-butyl ether) or ethanol/methanol added to the fuel in your area a stoichiometric ratio as low as 14.1:1 is more desireable. This is what I run due to the 10% mixture of ethanol in my area. This is of course the desired ratio at idle or any cruisning speed. Durning WOT sprints you will want to see 11.2-11.8. Of course this moot if your EGT's are rising above 1600F which is the failing point of the valves in these motors. An 11.2-11.8 ratio does not mean you are safe. You can have this ratio and still damage the engine if EGT's are too high. This is when more fuel is needed or some timing should be pulled. If you are seeing 10's then you are either to rich or the PCM has anticipated your egt's are too high removed timing and is now dumbing fuel in the cylinder to cool things off.

 

Jdm has my tune commanding 12.0 at WOT. Though my wideband reads slightly higher due to its location.

 

At least the Brisk plugs can be had two heat ranges cooler and they are silver. Not the cooper we want but we gotta take what we can get.