is it still good to run a vortech Fmu or should i upgrade to an s-fmu right now im running the fmu with the 12:1 disk but i see people running 10:1, 4:1 ??? which is best?? sorry for the stupid question but i wanna know if this is why im so rich all the time? is 12:1 to high? what should i be at with my engine?

nobody has an answer to this? how about listing what your running for fuel managment and why?

On stock injectors you NEED a 12:1
its only when you start replacing your injectors with larger ones you need to start changing your FMU ratio.

and yes the fmu does make the car run too rich . but rich is better than lean .

Thanks guys this helps out alot. I need to get with the program and read up more on the s-afc. i know very little about it but its my understanding you can actually control your fuel curve with one and your right better rich than lean no complaints there just tired of the black plugs.

so your sayin it mmakes it run rich, but is it so rich it wont pass smog?

i dont know reall as there are no regulations or inspections here in florida but it runs rich enough to turn brand new plugs black as coal in a matter of minutes

yea my fmu made it run that rich too . i upgraded to the sfmu and it ran a lot better .