Vt v6 in transit van

[gasute]

Hey guys i have just installed a vt v6 in my old transit van and was wondering how important the road speed value the pcm sees is. I am using a god as a speedometer but the real value from the pcm is much higher. I am assuming it’s something to do with a differential value. Is important to change the values to suit the new diff or are there other settings that need to be changed when installing a motor into a different vehicle. I was not sure if this affects the drivability or fuel consumption if left unchanged.?

[vlad01]

Mainly used for drive to idle transitions, spark tip in/out retarding etc.. if its an auto I think it also plays a roll in the shift table although I don't have experience with electronic autos.

Its easy to adjust. Look for the VSS PPK scalar and alter the value based on the difference in diff ratio or just go by GPS and play with the number until it matches the speed.

[delcowizzid]

If you change the ppk you need to do all the shift tables easier to just leave it stock so it shifts at the same rpm as stock .or if you have the gear and the time you can remap the whole lot to suit