Quote Originally Posted by Throbbinhood View Post
Pretty much this.. It's hard to explain, but take your car down a long steep hill and stop. put it in first and just let it roll down. You'll find you'll roll to a certain speed, and then generally the engine will start to hold the speed. In diesels, this is generally pretty low, in my rb30, this is generally 2500-3000rpm. This of course varies with how steep the hill is. Having 35's on as opposed to 31's means that the speed I am doing in this rev range is increased, and hence steep descent's on rough terrain can mean some brake/clutch work.
Yeah, I think I understand what you are trying to explain. You get less of an engine brake with 35" than with 31" on a given gear and steep angle down a hill. I think the reason is 35" goes further on the ground per turn of the wheel than 31", making the engine braking slightly less effective.