I have a 2000 si. I have vortech fmu, vafc, and dsm 450 injectors. Vafc is not tuned yet and i just wired in the 450 injectors. After i wired in the injectors the car misses bad at idle and stumbles when you give it gas. I double checked the wiring and everything is right. Vacuum flucuates at 10in hg. Any suggestions?

 

you have to set the afc to -30% to -40% to offset the new injector size. also you dont need an fmu when you run bigger injectors.

 

I took out the fmu. Under what setting do u adjust it to -35 to -40%

 

cant use 450cc injectors and the fmu together

 

under the narr throttle and wide throttle settings. you have to adjust it across the whole rpm range

 

cool thanks