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Old 02-19-2018, 02:47 PM   #1
Justinsixseven

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Virtual Dyno

Anyone know of a virtual dyno that can calculate hp/torque for a 6.7 Cummins? I don't have access to a true dyno locally just wondering if there is a way to calculate it from a computer.


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Old 02-19-2018, 02:54 PM   #2
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Like this?
Horsepower Calculator, calculate hp from et, trap speed, calculate tire diameter, mph and rear end ratio.
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Old 02-19-2018, 03:05 PM   #3
Justinsixseven

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Kind of. I heard a guy has one in excel that he can load a log into and it calculates it


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Old 02-19-2018, 04:36 PM   #4
allan5oh

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You can estimate it based on fuel flow and bsfc for any engine.
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Old 02-19-2018, 04:40 PM   #5
Justinsixseven

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Originally Posted by allan5oh View Post
You can estimate it based on fuel flow and bsfc for any engine.


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Old 02-19-2018, 11:53 PM   #6
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Quote:
Originally Posted by allan5oh View Post
You can estimate it based on fuel flow and bsfc for any engine.
But to get bsfc you need a dyno with fuelflowmeter.
 
Old 02-20-2018, 08:19 AM   #7
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Easiest (and best since it can't lie) to go get a weight on your truck at a truckstop or race shop and then go to the track and wee what it traps.

.
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Old 02-20-2018, 10:06 AM   #8
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Easiest (and best since it can't lie) to go get a weight on your truck at a truckstop or race shop and then go to the track and wee what it traps.

.
That's arguably the best way since it'll be measuring your usable power too!
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Old 02-20-2018, 01:45 PM   #9
allan5oh

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But to get bsfc you need a dyno with fuelflowmeter.
Bsfc nunbers for that specific engine yes. But its not hard to find them for specific near stock engines. Now the question becomes is the reported fuel flow rate accurate? On my detroit its dead nuts on.

Using lbs per gallon of 7 and a bsfc of 0.32 we get 21.8 HP per GPH. I like to use 20. Keep in mind this is only for 1500 to 1700 rpm where thermal efficiency (bsfc) is best.

My engine delivers 30 gph. Thats 600 at the crank and jives with the dyno numbers.
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480 HP to the wheels with a "400 hp" turbo with the fan on to boot. 920f max EGT
 
Old 02-20-2018, 07:12 PM   #10
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Google search for G-Tech. Essentially an accelerometer that can measure your real-time HP. Jason Sands has one and mentioned he was only about 20HP lower than when measured on rollers. Could simply be because a dyno can't account for wind resistance or get a precise correction factor for the condition(s) you're in at the time. It's a small boxed unit that has a windshield mount and would allow you to see figures immediately. Just takes a little calibration using vehicle weight, RPM limit, etc. I have one myself. I bought it a few years ago and have still yet to calibrate and use it .

However, if you've been down the track and have a weight to plug in, use the calculator linked above.
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Old 02-21-2018, 08:06 AM   #11
Justinsixseven

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Quote:
Originally Posted by jimbo486 View Post
Google search for G-Tech. Essentially an accelerometer that can measure your real-time HP. Jason Sands has one and mentioned he was only about 20HP lower than when measured on rollers. Could simply be because a dyno can't account for wind resistance or get a precise correction factor for the condition(s) you're in at the time. It's a small boxed unit that has a windshield mount and would allow you to see figures immediately. Just takes a little calibration using vehicle weight, RPM limit, etc. I have one myself. I bought it a few years ago and have still yet to calibrate and use it .



However, if you've been down the track and have a weight to plug in, use the calculator linked above.


That's pretty sweet! I might look into getting one of those. So in jason sands case, it was more accurate than a dyno because of environmental factors?


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