I used to wrench on a pulling tractor. Stock block, modified crank (longer stroke), shaved pistons, modified fuel pump, one massive blower and water injection. Burned 5 gallons of diesel and about 3 gallons of water every 300 feet. Wasn't exactly an economy ride. We never got it on a dyno. I would guess 750HP.
Can you explain how injecting water improves performance? I keep hearing that when watching tractor pulling on the boob tube, but I just guess I don't grasp adding water for fire?????