Interesting read on that thread,
https://ecomodder.com/forum/showthre...mpg-33961.html,
I plan on keeping the automatic as 8l90 ...point is 8 gears...and with a super low 1st and 2nd gears can pull strong even with a 2.43 of lower rear end.
As for the airodymatics check what I have already done there:
https://www.facebook.com/richardacoy...0309951&type=3
Note the same kind of air damming and side skirts..and the vortex foils on the back side of the Van.
I found this setup kills the effect of passing big rigs, my van does not jump around or be pushed around by them.
I have wondered if a air foil pushing air back into the back end (Like the old keep your back window clear on old station wagons...) would help or hinder its passing though air.
I do not plan on any more Areo changes...Unless the air foil pushing air back into the void behine the van is a good to great idea???
He did a bunch of TunerCat changes and I will be doing him one batter using the add on board that besides all he was able to do includes a automatic lean cruse setting allowing the leanest running with a clean transfir to normal and even power ranges again automatically...and all adjustable by its tuning software.
Two thing I will also stick with is by wide tires and brakes, I feel I MUST have the best brakes possible and have good brakes and wide sticky tires are the way to be able to stop a Van at high road speeds of 70/80MPH.
And he seems to be running a TBI system where I will be running a TPI which is reported to give 30% MORE torque, HP and MPG.
I will rethink my final gear ratio lower to his 2.14 gears...
Thanks very interesting read.
Rich