SAFC and Tranny Questions

Zenkiowns · 10-25-08, 09:19 AM

I own an '88 NA and had a few questions about AFM.

I have an SAFCI and usually have it set to 3% rich mixture for safety, but get about 17-19 mpg...

I was wondering what I could do to improve MPG, but not lose my safety range.

Also, I get this bucking in low gears almost as if I'm in the wrong gear. It only happens when I try to hold a constant cruising speed ( looking for a parkingt spot...) and during deceleration.

Thanks for the help in advance!

Msb.

FirstRotaryExp · 10-25-08, 07:56 PM

The bucking can be caused by a poorly adjusted, or faulty, TPS sensor.

As for your SAFC you can 'detune' the fuel settings quite a bit and still be on the safe side. Personally I have my own SAFC-II settings running from -17% fuel at idle to -3% at 8k rpm's. Im seeing roughly 20-23 mpg with a heavy foot. My car and mods are in my signature if you need a comparison.

neffy · 10-27-08, 12:13 PM

if you get a wideband a/f gauge then you can re-tune your afc if things are running too rich. you can even see if your cruise a/f ratio is too rich , so then you could lean it out some and achieve somewhat better mileage

Zenkiowns · 10-28-08, 11:41 AM

Thanks guys, but as of now the TPS and mpg's are the least of my worries, my lighting has quit working... time for some searching and a new thread!