Contour Enthusiasts Group Archives Forums Modifications Duratec Performance safc fuel table

before i dyno tune this thing anybody got a few ideas to put into this thing so it can leave 0 on fuel correction. what do you guys have yours set at with your mods?

thanks

If you have not changed injectors or MAF, then leave it alone for now.

Go to the dyno with wideband O2 or get a wideband O2 and go driving.

Then start using it to correct the fuel at the 100% WOT settings. For a naturally aspirated engine I'd recommend you shoot for a tailpipe O2 setting of 13:1.
For before the catalyst maybe 12.5:1 the richest, to 13:1 at the highest.

If you change settings below that you won't know how you are affecting the pcm learning mode and will make your job harder. If you do it at WOT then it will generally stay pretty close to how you set it if the changes aren't huge.

ok kool, my buddy has a wideband and a laptop, but i have to wait till saturday to use it, thanks.

Just to clarify, if you try to make changes at less that 100% throttle setting, then pcm may undo the changes as it learns.
So just work with the 100% throttle setting.

With a wideband mounted in a stock O2 sensor port I'd shoot for about a 12.8-12.9:1 A/F unless you start to hear evidence of a ping or loss of power under load. You'll probably be safe to as high as 13.2:1 on this engine if everthing else is in good shape (low carbon buildup in the cylinders, new fuel filter, clean air filter). But I wouldn't set it above 13:1 if you mount your sensor in the stock location. Also, in the last 500 rpm, above 6500rpm you could set the air fuel back down to about 12.8:1 to keep things quiet since a lot of times the engine can be more sensitive to lean air fuel that high of an rpm.