Here is a HOW TO, to lower the Fuel Ratio from FMU 12:1 for example to 8:1 or 2:1

To do that we need to bypass the Vac line that goes to the FMU with a MBC to restrict the air pressure the FMU reads, and instead of goes to 12:1 as preset (for example), only raise the fuel pressure controlled by the MBC as you want.

Enjoy

 

+1!!!!!!!!!!!!!!!!!!!!

 

avoid using fmu's as a tuning devise....

 

I agree, but FMU are a nice option for low boost 6-7psi.

 

lol add a boost tap on the line and you have a fully incremental super fmu. top ----. not bad for low boostie

 

with any obd1, chipping is way better, and cheaper

 

 

yeah maybe chipping is easier but I have a neon and those ecus are not chippable

 

you never mentioned that

 

wat do you mean by boost tap? im planning on running 8psi so i was thinkin going with the fmu just for now. plz help me out