[7stang0]

Okay guys I really need help. Fmu. I found a 12:1 used but in reading stuff on them it suggests 7:1 or higher for larger injectors. Can I get this 12:1 and run stock injectors? Or should I buy a higher size fmu and run my 39lb. I wrote I wrote vortech for a second time now and. Still no response. Please help thanks

[idiotsgod]

Most people recommend you run 42# injectors with a sc set up 39# will prob be fine but you def shouldnt run stock because it can starve the engine of fuel and run lean

[7stang0]

Okay well what about the fmu size? Anyone know anything about these? I knew I needed bigger injectors but in some things I've read it says you may need a like 8:1 or more for 39 or higher injectors. I've read so much and its getting confusing and contradicting

[jgorm]

I think FMUs are junk. I refuse to tune with them because its tricky to dial in the AFR correctly. A tune is the proper way to get your WOT AFR correct. If you run boost, then run a wideband too.