Quote Originally Posted by Prevosthonda View Post
Definitely use the mode button and watch boost pressures before and during the hills, I find sometimes even in mode the rpm’s and boost get to low for my liking and as you probably already know, once you loose the sweet spot on a hill you probably won’t get it back and will be with the truckers flashing hazards and crawling . You may certainly have a boost leak somewhere, charge air cooler, turbo boot, charge air pipe rubbed thru somewhere ect. If your boost is not pegged going up hills or under heavy throttle then dig into it. My bus runs anywhere from 195 to just below 210 , but never over that . Same 05 chassis . If things are the way they should be you’ll be able to climb right past most trucks and not go much lower than 4th gear. Again there’s definitely a sweet spot for hill climbing . Good luck


Logan Tidd
06 marathon xl2
Having driven somewhere north of 2.3 million miles in a tractor trailer back when a 350 HP motor was a big motor and air conditioning was nothing more than a wish, climbing hills in the low 20's MPH when it was 100+ degrees in the shade if there was any and it took hours to get up a big hill. I have to smile at your comment.