Forum Discussion
- peak horsepower (or torque) is not the real indicator of acceleration and pulling power. the real indicator is the INTEGRATED AREA under the torque curve in the rpm range you are using. the vehicle with the largest integrated torque wins, not necessarily the peak torque. Broad flat torque curve can often beat a narrow peak curve.
For the dyno results, rather than peak numbers a graph of the torque curve may very well match well with the towing experience. DirtyOil wrote:
Until they remove the Human factor from these "tests", they're all mute results.
Imagine this... Fish driving the Ram in the test and T&P in the Ford and Homer Simpson in the Chev(GM)... none of them would cross the starting line! :B
:BRCMAN46 wrote:
Wild Card wrote:
RCMAN46 wrote:
Wild Card wrote:
No brainer that the inline engine produces more torque. Hp is derived by the RPM the engines can spin to...again no brainer that the V engines spin faster thus produce more HP.
Lets take a look at the spes.
Ram 6.7 385 hp @ 2800 rpm
900 ft/lbs @ 1700 rpm
Ford 6.7 440 hp @ 2800 rpm
925 ft/lbs @ 1800 rpm
Duramax 445 hp @2800 rpm
910 ft/lbs @1600 rpm.
Again... Horse Power is a calculation.
Torque in ft# X RPM /5252, thats it...this is the only way to calculate Horsepower
I also dont buy those numbers above. The V8 diesels red line almost 1k RPM above the I6. Do the math yourself.
Buy the numbers or not but they are the numbers published by the respective truck manufacturers.
Take The time to look them up at the respective truck websites.
Despite popular belief the chassis dynamometer measures horsepower directly and then the computer calculates the torque curve.
Look up how a chassis dynamometer works.
Who cares whether horsepower is measured with a scale, a ruler and a watch or a tach and torque transducer. Either way it is a meaningful value. Torque on the other hand has no time associated with it and is therefore almost useless on its own.06Fargo wrote:
I still like the FLT Ike run where the boys are "towing heavy" with a flatbed behind some one ton and a Volvo grocery hauler with his "I'm a slow truck" flashers on running light goes by them like they are on jackstands
Thats why I find these hero threads amusing.
the southern gals at the HDT rally call em all LGT's
(little girly trucks)- I still like the FLT Ike run where the boys are "towing heavy" with a flatbed behind some one ton and a Volvo grocery hauler with his "I'm a slow truck" flashers on running light goes by them like they are on jackstands
- Until they remove the Human factor from these "tests", they're all mute results.
Imagine this... Fish driving the Ram in the test and T&P in the Ford and Homer Simpson in the Chev(GM)... none of them would cross the starting line! :B RCMAN46 wrote:
This is a quote from Wikipedia on how an inertia dyno works.
Inertia Sweep: an inertia dyno system provides a fixed inertial mass flywheel and computes the power required to accelerate the flywheel (the load) from the starting to the ending RPM. The actual rotational mass of the engine (or engine and vehicle in the case of a chassis dyno) is not known, and the variability of even the mass of the tires will skew the power results. The inertia value of the flywheel is "fixed", so low-power engines are under load for a much longer time and internal engine temperatures are usually too high by the end of the test, skewing optimal "dyno" tuning settings away from the optimal tuning settings of the outside world. Conversely, high powered engines commonly complete a "4th gear sweep" test in less than 10 seconds, which is not a reliable load condition,citation needed, as compared to operation in the real world. By not providing enough time under load, internal combustion chamber temperatures are unrealistically low and power readings - especially past the power peak - are skewed to the low side.
It says nowhere in there that a dyno measures horsepower and from that, torque is derived.
The fact is that a Dyno measures the amount of torque at a given rpm and uses that to calculate horsepower. If you you don't want to believe me then take it from the very manufacturer that made the dyno in the video.
"Values Reported by a Chassis Dynamometer
A chassis dynamometer can directly measure the following values:
1. Roll shaft RPM/speed.
2. Torque/force applied to the dynamometer’s roll shaft(s).
All other values are based on these original 2 values. For example, acceleration is computed from
2 successive speed measurements, power are calculated based on the measured speed and torque
of the dynamometer’s rolls shaft(s), etc.
When a chassis dynamometer reports a “torque” value, the value reported is the torque measured
on the dynamometer’s rolls shaft(s), not on the vehicle’s drive axle or engine crankshaft. "
Page 7 - Mustang Dynamometer: Operator Manual- More like the Chevy front suspension broke as it was trying to pull the broke down Ford up a hill. Then the ram gets a gooseneck and pulls them both to the shop.
Lessmore wrote:
bguy wrote:
The road sure is a nice dyno.
I'd like to see them 3 abreast from standing start. Hold it wide open. First one to the tunnel wins. Keep all the rest of the traffic off the road
I can see that scenario going horribly wrong...ending up with three trying to get through the passageway....at the same time... when it's only big enough for two....kind of like the old Three Stooges movies. :B
Not really. The Chevy driver will be pulled over and have a half a beer in him before the Ford gets there and those two will have the rest of the 6 pack drank before the Ram gets there. Unfortunately there won't be any beer left for the Ram driver. :B
Most bogus numbers I have ever seen from a dyno. Not fake; just bogus.bguy wrote:
The road sure is a nice dyno.
I'd like to see them 3 abreast from standing start. Hold it wide open. First one to the tunnel wins. Keep all the rest of the traffic off the road
I can see that scenario going horribly wrong...ending up with three trying to get through the passageway....at the same time... when it's only big enough for two....kind of like the old Three Stooges movies. :B
