I know most you turbo honda guys use the vafc hack with dsm 450s instead of the fmu method. I want to do something similar because running 10psi on a 12:1 fmu and stock injectors doesn't sound very appealing to me so i want to ditch my current setup.

My question is...my fields sfc can only cut down -30% so do you think the dsm 450s cut back with the sfc will be too much fuel? If i recall correctly a VAFC can cut back by as much as 45% or 50% duty cycle. I don't want to spend 300 bucks to get a new VAFC when i have my fields SFC already.

If you do the math 450's cut back 40% would be like using 270's at full duty cycle, and cutting back 30% would be 315 (close to rc 310s)

Another option would be like some 290's or 310s but use a smaller fmu such as 6:1 or 8:1

any input is appreciated greatly

 

I'd use the 6:1 or 4:1 with 450's or else you'll bog and maybe die. Then use your sfc to tune that.

 

what about no fmu and just 450's detuned -30%

 

I think you'd be alright maybe just have a sluggish idle at times.

 

i have a b&m command flo, could i use that to tune down my idle?

 

The only problem I forsee is that it's not cutting out enough for you not to throw a CEL. I never had mine set less than -35% and I still threw that damn CEL 45 (runs too rich).

I had idle at about -25%. I played with my settings all the time with my butt-dyno.

 

Haha, butt dyno.

 

It's quite accurate. It has a margin of error of only 99%.