i had the vxcf9 and went back to vxcf4, this was not done through php so i have everything at the vxcf4 level. Meaning ficm
has no inductive heating. (i think php can give you a vxcf4 with benifits of the vxcf9)
Now the differences:
- egt's are about 100 deg f lower on the vxcf4 (talking factory programing while towing)
- haven't noticed any fuel milage changes, mind you i have also not made any long distance trips to provide a true indication.
- switched to vxcf4 as i could not get a tune to function correctly, basically just smoked like crazy with no power, or had more power then it should for a tow tune. Tuner basically gave up and told me to switch back to vxcf4.(could have been a tuner issue as i know a few places were having problems when vxcf9 came out)
as for your conern, i honestly didn't notice any improved launch performance from the vxcf4.
just another thought, ford had an updated calibration to address high elevation power levels, i'm not sure if that was for the vxcf4 or vxcf1, but there is a tsb
for that issue and it was just a calibration update. I would verify that your not droping back to a cal that could make things worse. (btw
that was a tsb
long before the vxcf9 came out)