Originally Posted By: totegoat
Your NA Kubota 3710 may be fine for your use at sea level.
Its a different story at altitude.
I wouldn't buy a non-turbo tractor, the performance is dismal.
Well, I doubt I'm going to take my tractor on a road trip to Pikes Peak...
Funny enough though, the NA diesel tend to have maximum torque ratings far far below the PTO speeds, so they lug much better. A turbo diesel tractor has max torque at 1600 rpm with a PTO speed of 2100. The same Hp in NA would have a peak torque at maybe 1100 rpm.
A neighbor was testing a newer Kubota turbo 80hp tractor to replace the old NA 75hp one, and liked it except for hauling wagons down the road. The old 3 cyl perkins would lug down in a gear but keep pulling down to 1100-1200rpm. It had 11000 hours on it as well, so who knows how much hp it still making. The Kubota needed lots of down shifting to keep it from falling off its peak torque and even the new fancy trans didn't seem to enjoy that. He found that down shifting your tractor with it bogging up a hill with a couple wagons on it wasn't his idea of fun, and didn't end up getting it.
I'm sure the turbo Kubota would win the race up Pikes Peak though, especially near the top...