Well, it has good bottom end, good mid and good top end. It has a nice 800 rpm idle and it crawls real well at idle. The Aisan had a bit more idle torque but it also liked slightly higher idle speed. The lower rpms pull nice and it has the most torque from I would say 2,500 to about 5,000 rpm. Steady pull all the way except when you roll into the secondary you get a nice little boost. The tweaked up Aisan hit harder on the secondary than this carb but the Weber had a lot more mid range torque.
I am pretty impressed with it even with this kind of economy it still goes good. I feel like I could get a bit more economy out of it but I think it's in a pretty happy compromise spot right now. You do have to drive it right to get 17 mpg, cruise in 4th gear no more than 65. If you do 75 or 80 and use 5th you still get around 14.5-15.5 mpg though and that isn't bad for this truck.
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I think I will dink with the main jets just a little bit. I still think I am a little rich at the top of the primary and the start of the before the air correctors kick in.
So if I was drag racing I would choose the Aisan and if I was rally racing I would choose the Weber, if that makes sense. The Aisan was more snorky, and had a little more "buck", probably because it goes from lean to rich and can't transition as well when you open up the intake and all that. It had more flat out acceleration, and he Weber has more all around pull and is smoother, at least the way it is jetted now.
If I was driving back and forth to work I would choose the Weber, which is what I am doing
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