Originally Posted by Megs_PB
Our 7.3 T444e is the 175HP version. One more thing to upgrade..gently!
im in the middle of working at getting my 190HP tuned to 210.. its purely a computer program change.. one that navistar seems to hold close to the chest.. I have the software and the interfaces and knowledge to repgram many pieces of that computer.. however to change the horsepower parameter requires codes from navistar .. I have a case open with them.. as mine is a completely custom bus.. (ive modified the cooling system, fans, dash, swapped the transmission, added electronics, etc) so im playing it off to navistar that its a custom rig and thus obsolving them of any legal liability to turn up the horsepower..
see they may come back and state that the transmission isnt capable or the U-joints, or the brakes, etc etc.. so as I progress ill keep my thread update to hopefully help.
higher HP doesnt necessarily mean poorer economy.. a severely lugged engine or one run at open throttle high RPM results in more heat than power being made ..
from what ive seen mosrt all the skoolies in the earlier years of the T-444E when it ran the 3 box computers.. 94-early 97.. were all 175HP regardless... the later years.. mid-97 - 2001 were 175 HP unless the bus was equipped with factory A/C (mine). and then 02 and up I havent seen any 175 HP versions.. then again Ive only peeked at a couple of the late years of the 444E busses.
ive seen Rear engine full size busses with MT-643 transmissions or MD-3060's running with the 210 or 230 HP variant.. the 230HP variant has different hardware so its more than just a computer change, the turbo, head gasket, and I believe cam are different in the 230s.