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If two trucks were identical in all aspects, such as weight(say 6800lbs), traction, etc, each had the perfect gear ratio, the only difference were motors, a 632ci gasser making 1100hp @8000rpm and 950 fpt @ 5000rpm and a 12 valve 5. 9 making 750hp @ 3400rpm and 1450fpt@ 3000rpm who would pull the sled the farthest??????????? the gasser is making 350 more hp, but the cummins is making 500 more ft pd o' torqueage.
 
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Id say the gasser,if it were geared right. The RPm's are very important when pulling. IMO with only 3200 to play with the diesel wont be able to get the wheel speed to match the gassers ,thus it wont pull as far,even though the diesel is making more torque,at 8000RPm the horsepower more than makes up for it. This is just mu guess,I have pluued less than a dozen times,but I know id love to have some more RPM,it helps a lot.
 
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The cummins would be able to spin faster than 3200rpm, I'm just guessing thats peak hp , should spin to 4500rpm.
 
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Wheel speed on the gasser would most likely win, but don't bet the farm in pulling!!!



Blackdog, Thunder,(PSD) and I all pulled against 9 Pro Stock gassers, stacks out the hood, no suspension, alcohol, tilt front ends, the works.



I blew a boot, Thunder hopped, Black dog backed off because he did not have a wastegate yet, but we still managed to beat 3 of them.

The other 6 were not far ahead.



We will just about crush any gas motor that can still be streeted.
 
I would say that with the shear torque the Cummins puts out it would walk past any gasser. since torque is what give you the pulling power and horsepower is what gets the torque there faster.
 
yea like he said the torque will get you movin, the horsepower is mainly like a straight line accleration. need both but i think in this case of that much of a load the torque is what u want. the dragstrip you'd want the horsepower. i think
 
Keep in mind that he said "perfect gear ratio" the perfect gear ratio could be considerably numericaly higher for the cummins since it has more torque... thus higher wheel speed with less RPM for the Dodge. :)
 
ISB RPM?

"The cummins would be able to spin faster than 3200rpm, I'm just guessing thats peak hp , should spin to 4500rpm. "



The peak on the ISB is 2700 RPM. You won't get one to exceed 3500 RPM under normal circumstances.

There is no power at 3500 as the ECM is robbing fuel from the injection system.
 
Thanks for clearing that up Nowel,the original post is not possible either since an ISB is defueling at 3400,and peak power is at 2700. ,and to have 750hp it would likely come at 3000-3250RPM,with N20 and propane. If the ISB would turn t0 4500,Id be a happy camper. When I sled pull the RPM's hang at 3200-3350 no matter if its in 2nd or 3rd,there is really no power above that RPM,even with the Drag Comp which fuels hard to 3200.
 
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Torque Peak?

Snow Man, I bet you'd like to be hammering snow banks at 4500 rpm wouldn't you?Oo. OH MY!!!:eek:

At 4500 rpm you could prolly plow a glacier into submission :-laf :-laf Might have to weld a few gussets on the frame though;)



As far as the 1450 torque figure goes, the peak torque is below 2000 rpm. That may be more important than the hp rating. Hp without torque isn't going to pull a dang thang. Think of a F1 engine hooked up to the nastiest sled in all of sledland. It would be like hooking up a 125cc 2-stroke honda to the Alaska pipeline:D



OK jbetker, here's my scenario. Gotta 632 cu inch Cummins and a 359 cu inch gas motor. The Cummins has twin turbos runnin' 140 psi and dual VP44's with 36 hole injectors producing 10 kilograms of fuel. Which one do you bet on???:confused:
 
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