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Big59er
Dodge Dakota
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5/21/2002
00:07:45
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 Subject: Power loss to wheels...
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Message:
Iv always wondered and was hoping someone could clear this up for me...
The 360 retains around 250 horse power. Yet everybody Iv heard that Dyno's the engine stock pulls in around 190 to 200 horse. Iv heard its around 20 to 25% power loss.
I understand there is always some power lost through the drive train but I didnt know it was that much. Why is that? 25% sounds like a hefty ammount to me. Is it because its a truck and everything is alittle longer?
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Halo3
GenIII
 
5/21/2002
08:07:58
|  RE: Power loss to wheels...
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Two words: Automatic Transmission
The automatic transmission on the 5.9L is the biggest cause of power loss. Everything from the valve body to the torque converter sucks up a little piece of engine power to make it operate. However, some of that can be regained by going to aftermarket parts (i.e. torque converter, shift kit, etc.).
Semper Fi,
Halo3
'00 Lt. Driftwood 4x4 SLT DQC w/5.9L
Halo3's Dak
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Troy
Dodge Dakota
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5/21/2002
08:40:26
| RE: Power loss to wheels...
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Halo is right about the trans robbing hp. I've heard that is usually about 18%-22% loss from the engine to the rear wheels.
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Blue_Bullet
Dodge Dakota
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5/21/2002
13:26:19
|  RE: Power loss to wheels...
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Ya I agree also, and on top of that think about your tires and wheels too....I dont know the exact numbers but there is a ratio of weight to power loss...I know 1 lb of rotaional weight you dump is equal to 7 lbs of stationary mass though.
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DaveR
Dodge Dakota
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5/21/2002
17:04:03
| RE: Power loss to wheels...
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Along the same lines, I caught a show on about the Rolex series and it delt mainly with restrictor plates. They said to get as much power as they could and figure out what was drawing power to opperate they hooked the motor up to a 500HP electric motor to turn the engine. They then measured how much power it took to turn the engine with the electric motor. They said they found something like 200 hp hidding in those engines once they changed bearings and rockers. Kind of interesting.
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blued
Dodge Dakota
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5/22/2002
22:29:45
|  RE: Power loss to wheels...
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Message:
That's a lot more substantial loss than I had imagined I. I thought it would be more like 10 - 12%... not 20 - 25% OUCH.
Have any of you guys done anything (mod wise) to alter this i.e. shift kit, torque converter, bearings??? anything, and if so what were your results???
One would think it should be possible to put some work into solving this problem and effectively gain rear wheel horsepower by some rather large margins. Any suggestions (I am looking to keep it streetable so no 2800 RPM stall converters please LOL)
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