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HP to roll the truck down the highway at 55mph

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buickanddeere

Well-known Member
Ran the truck down a flat stretch of highway at 55mph steady and measured HP using the scan tool.
45HP at the flywheel to operate all accessories and overcome aerodynamic drag.
2003 1500HP 4x4 crew cab with 6 liter. Brush bar, running boards and cap.
 
It's neat this can be calculated. It reminds me, last week at a tractor pull a similar thought occurred- rather than just reporting the distance the weight transfer sled was pulled, why not have a hitch sensor for foot pounds of pull exerted times speed which would translate into drawbar horsepower?
 
(quoted from post at 08:31:44 08/01/11) Ran the truck down a flat stretch of highway at 55mph steady and measured HP using the scan tool.
45HP at the flywheel to operate all accessories and overcome aerodynamic drag.
2003 1500HP 4x4 crew cab with 6 liter. Brush bar, running boards and cap.
Click to expand...

How are you getting 1500HP out of that 6 liter?
 
sounds right, it will also increase with some other factors, as you increase speed, it takes more hp to overcome the drag, also more if headed into the wind, but im courious since you have these factors, what happens under the same conditions if you roll a window down? what if you roll a window on each side down? just wondering what that does to the drag factor or if it even matters as far as causing more drag, or the same
 
used to have a very old landrover (1968) when i was youger and still living on the east side of the pond, according to the book it only made 60 some horsepower... well i still manged 70mph with it, but it was maxed out, 4.71 rear end...
 
"1500HP"??? Reminds me of those old supercharged Wright Pat R1820s I used to drive around the sky! 56" of manifold pressure @ 2800 RPM. 115 octane avgas. Blue flames. "The good old days".
 
That sounds like an interesting concept. When I hear all this calculated horse power "guess" that people come up with and they have absolutely no way of measuring. Some do of course, most don't. Case used to have a gauge they used to measure pull as a sales tool. I have seen some drawings of how to make and calibrate one years ago.
 
I drove a Peterbilt with big aerodynamic sleeper bobtail about 1500 miles a few weeks ago. I expected to probably make about 12 MPG. I didn't measure very accurately but it was more like 8 MPG.
 

45 hp? That's probably about right. You can cut it down with different tires, lowering, aero improvements, syn oils, air pressure in the tires, etc. But it's a truck! Just a rolling brick.
 
(quoted from post at 11:34:42 08/01/11) Amazing how one little fat fingered fumble changes the message.
Click to expand...

buickanddeere
I didn't know Canadian computer keyboards had "D" & "P" next to each other. On American computer keyboards the "D"key is on LH end of keyboard and "P" key is at the far RH end. Either that are you have " real big fingers" or "real big excuse". :lol:
 
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