how much HP question.
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Elder User
Joined: Mar 2009
Posts: 862
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From: eastern shore,MD
how much HP question.
how much horsepower did the 01 7.3 PSD come with from factory? how much would my truck have with all that is done? just wondering. there is no dyno around here that i know of, but i would like to find a round about number?
Lead Driver
Joined: Jun 2007
Posts: 7,760
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From: Hampton, Maryland.
I believe the '01's were rated at 250HP/525 torque. Depending on the truck and what type of dyno, with the mods you have and on your truck you should see 295-320hp/ at 650-680torque. give or take.
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
And the 295-320 HP that Jason is quoting for your truck is also for the rear wheels.
Postmaster
Joined: Jun 2006
Posts: 2,647
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From: Fulltime RVer
I'm pretty sure this won't clarify anything but as they say the devil is in the details! The dyno measures the HP that the tire treads apply to the dyno's rollers and there's typically about 5 HP dissipated in the flexible rear tires which are between the rear wheels and the dyno's rollers. Since the wheels have a solid connection to the axels I consider them to be one mechanical unit so that the RWHP is the same as the rear axel HP and by this definition the RWHP is about 5 HP more than what's measured at the dyno's rollers and then you add to the RWHP the HP that's dissipated in the diff, the drive shaft, and the tranny to get the FWHP. According to some data I've seen a bone stock truck applies about 210 HP to the dyno's rollers and this implies about a 215 RWHP and there's about 35 HP lost in the diff, the drive shaft, and the tranny which implies a 250 FWHP.
The above definition of RWHP is the same that CAT uses on their RV website in their graphs of hill climbing speed vs % grade for motorhomes where they subtract the rolling resistance HP that's dissipated in all of the tires from the RWHP to get the road HP which is the HP that's available to overcome aerodynamic drag and to propel a vehicle up a hill. So the road HP is equal to the dyno roller HP minus the rolling resistance HP that's dissipated in the front tires. Of course if you dyno a 4wd truck on a special dyno that measures the HP that's applied by all the tires then the road HP is equal to the dyno roller HP.
The above definition of RWHP is the same that CAT uses on their RV website in their graphs of hill climbing speed vs % grade for motorhomes where they subtract the rolling resistance HP that's dissipated in all of the tires from the RWHP to get the road HP which is the HP that's available to overcome aerodynamic drag and to propel a vehicle up a hill. So the road HP is equal to the dyno roller HP minus the rolling resistance HP that's dissipated in the front tires. Of course if you dyno a 4wd truck on a special dyno that measures the HP that's applied by all the tires then the road HP is equal to the dyno roller HP.
