I think the t4 should be able to get into the 40s pretty easily with 7 cells and the Novak system. I don't know the t4 transmission ratio off hand, or I could calculate an approximate top speed. I know it gets nowhere near the posted 5800rpm/volt, but it still is a nice little system and plenty of pep for the smaller vehicles like the t4.
i am running onroad with this truck and i have a highly modified tranny. i literally have redesigned all the parts and have taken out over 20 grams of rotating mass. i can push that gearing cuz i have alot less mass to turn, so all the power goes to the ground.
S^3: everyone wishes they could design modifications like these.
I've been 53 mph in my bandit with my SS on 30/72 gearing and 7 GP cells.
Normal gearing(18-20/81 or so) will get me around 40-42 mph on 7 GP cells . These systems thermal really easy so you have to watch the temps closely and find the right gearing.