2.5

[xb03fs]

Which 2.5 stock would have the most torque and make the best ski motor
150 EFI
150 Carb
175 EFI
175 Card
200 EFI
200Carb

I know the 150 would be slowest and the 200 fastest

[Bartman39]

The higher HP motor the higher the torque is at the same RPM (based on stock motors)... I would for a ski app go with the 200 EFI and use a 2 to 1 ratio lower from a 150... Prop it for the max speed that you ski at, which puts the motor in the ideal torque range... You would have a stump pulling but very steady speed setup... Just gotta figure out what boat to use... :D

[jowens]

He's got a XB2003 Allison now.

[xb03fs]

yeah I want to pull stumps and run 70-75 gps

[Bartman39]

Then go with the 1.87 to 1 ratio lower that comes with a 200 EFI and start with a 25P TXP-OT4 or Hydro of the same size... Either prop you`ll most likely hit the limiter but be able to pull like heck and still run those speeds... Also could have the limiter raised to 7500 and run 80+ :thumbsup: