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General Diesel Tech Farm equipment, Medium Duty, Big Rigs, and other General discussion can be found in here. |
02-19-2018, 02:47 PM
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#1
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Name: Justinsixseven
Title: Green Behind the Ears
Status: Not Here
Join Date: Feb 2016
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Posts: 54
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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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02-19-2018, 02:54 PM
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#2
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Name: Cozze44
Title: Junkman
Status: Not Here
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Location: WIND GAP, PA
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__________________
Frank
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02-19-2018, 03:05 PM
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#3
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Name: Justinsixseven
Title: Green Behind the Ears
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Quote:
Originally Posted by Cozze44
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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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02-19-2018, 04:36 PM
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#4
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Name: allan5oh
Title: Too Much Time
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Join Date: Oct 2012
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You can estimate it based on fuel flow and bsfc for any engine.
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All of your BSFCs are belong to me
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02-19-2018, 04:40 PM
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#5
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Name: Justinsixseven
Title: Green Behind the Ears
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Quote:
Originally Posted by allan5oh
You can estimate it based on fuel flow and bsfc for any engine.
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I sent you a message through Tapatalk
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02-19-2018, 11:53 PM
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#6
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Name: Leiffi
Title: Too Much Time
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Quote:
Originally Posted by allan5oh
You can estimate it based on fuel flow and bsfc for any engine.
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But to get bsfc you need a dyno with fuelflowmeter.
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02-20-2018, 08:19 AM
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#7
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Name: imelmo
Title: Go away, I'm 'batin'!
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Location: Slidell, LA
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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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02-20-2018, 10:06 AM
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#8
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Name: CorneliusRox
Title: Seasoned Rookie
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Join Date: Dec 2012
Location: Detroit, MI
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Quote:
Originally Posted by imelmo
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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That's arguably the best way since it'll be measuring your usable power too!
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02-20-2018, 01:45 PM
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#9
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Name: allan5oh
Title: Too Much Time
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Join Date: Oct 2012
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Quote:
Originally Posted by Leiffi
But to get bsfc you need a dyno with fuelflowmeter.
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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.
__________________
All of your BSFCs are belong to me
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02-20-2018, 07:12 PM
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#10
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Name: jimbo486
Title: Too Much Time
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Join Date: Jan 2010
Location: Orange County, CA
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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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Last edited by jimbo486; 02-20-2018 at 07:17 PM.
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02-21-2018, 08:06 AM
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#11
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Name: Justinsixseven
Title: Green Behind the Ears
Status: Not Here
Join Date: Feb 2016
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Posts: 54
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Quote:
Originally Posted by jimbo486
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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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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