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Crank vs Real Numbers |
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amcenthusiast
AMC Addicted Joined: Jul/02/2012 Location: SW Atlanta GA Status: Offline Points: 1778 |
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Posted: May/01/2018 at 11:02pm |
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http://www.epi-eng.com/piston_engine_technology/thermal_efficiency.htm
http://performancedevelopments.com/fuel-flow-calculations-for-horsepower/ https://wahiduddin.net/calc/cf.htm |
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443 XRV8 Gremlin YouTube video: https://www.youtube.com/watch?reload=9&v=2DmFOKRuzUc
XRV8 Race Parts website: http://amcramblermarlin.1colony.com/ |
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rms827
AMC Nut Joined: Apr/18/2018 Location: California Status: Offline Points: 378 |
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I'd bet your altitude was definitely part of the cause for the low readings. When I was in school, the instructor spent about an hour or so covering that issue with carbs. Now if I could only remember what he said, LOL.
Gotta agree with Tomslik too... No real qualifications to hit the track other than the cost of the run. Used to be a joke in Atlanta because we'd see kids and 20 somethings with rental cars hitting the track. NOT rented sports/muscle cars either; HiPo cars like Chevy Cavaliers, LOL. |
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1964 AMC Rambler Classic 660
"You can think I'm an idiot, just don't talk to me like I'm one." - Batman |
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tomslik
AMC Addicted Joined: Mar/07/2008 Location: Colorado Status: Offline Points: 680 |
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Geez Dean, how qualified do you need to be? I could be talked into driving if ya want..... |
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67 american 290/4speed |
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rogue_66
AMC Nut Charter Member Joined: Jun/29/2007 Location: Oregon Status: Offline Points: 274 |
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Makes sense! I failed to mention that my original post in pictures included concerns about jetting at my altitude...http://theamcforum.com/forum/gremlin-x-dyno-run_topic93460_post826726.html?KW=#826726 ...so the primary reason for the dyno run was for tuning purposes, as I wanted to know how close we were tuned for 5280 ft. The operator was baffled by the extremely low HP/Torque numbers...but he did say the reading indicated that we were jetted way rich which is cool...because we're moving to sea level in a few months . Tony...To be quite honest, I've never made a pass down the track nor am I qualified to do so..but it's on my bucket list now that I'm officially a "geezer" . Dean |
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amxdreamer
AMC Addicted Joined: Jul/30/2008 Location: Vancouver, BC Status: Offline Points: 8509 |
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Your numbers on a track will tell the truth. Take her over to Bandimere before you move!
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Tony
Vancouver, BC 1970 AMX 1972 Badassador AMO#10333 |
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BassBoat
AMC Addicted Joined: Aug/29/2008 Status: Offline Points: 1719 |
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Oh, and your dyno readings will be different/wrong if the operator doesn't put the right gearing in or if you maybe ran it in 5th gear instead of 4th...
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BassBoat
AMC Addicted Joined: Aug/29/2008 Status: Offline Points: 1719 |
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Dyno results can be humbling. I was quite proud of my AMX but on a low barometer muggy day I could only get 283 HP through the mufflers and 294 with open exhaust to the wheels on the dyno at GAD. That car would typically run 110 to 112 in the quarter and on that day my 283 HP would only get me to 106. I had a very close to stock AMX with BW automatic and 3.15 gears that ran 14.50's at 94 mph. So that is what I think a 315 HP factory rated AMX is good for if you want to plug numbers into one of those calculators.
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motorhead_1
AMC Addicted Joined: Apr/16/2014 Location: AZ Status: Offline Points: 1006 |
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forgot about the dyna-pack hub mounted dyno, no need to worry about blowing up tires. takes the weight of the wheel and tire out of the equation, so will read slightly higher.
all different dynos aside, they are just a tool to aid in tuning. for accurate before and after shots use the same dyno, same operator etc. unless you are bench racing and want to brag about 5 more hp than the next guy. tune the engine on the dyno and the chassis at the track...
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69 SC/Rambler tribute 401/th400, 68 Rebel SST LSA, 66 F100 460/c6, 88 Merkur Xr4Ti, 71 Jaguar XJ6 LS1, 08 Supercharged Tundra
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Ken_Parkman
AMC Addicted Joined: Jun/04/2009 Location: Ontario Status: Offline Points: 1814 |
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Never been on a mustang, but have heard they give a lower number. Wonder what the reason is if true. Power is a basic engineering definition, so it should not be hard but it is.
Also sorta humbling sometimes. Not knowing how the mustang calculates a dynojet would give a lower number in 3rd gear so that is some of your story. You should make the pull in 4th. The concern with OD is wheel speed, and in 5th at 5200 rpm would be a whole lot. Tires do come apart on chassis dynos (been there done that - not good) so you don't want to be too far outside the tire speed rating. Use it for tuning, then go to the track and you really know.
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motorhead_1
AMC Addicted Joined: Apr/16/2014 Location: AZ Status: Offline Points: 1006 |
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the type of dyno will make a difference. dynojet will read the highest IIRC.
mustang ~12% lower then there's the heartbreaker dyno, the dyno dynamics reading lower yet. |
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69 SC/Rambler tribute 401/th400, 68 Rebel SST LSA, 66 F100 460/c6, 88 Merkur Xr4Ti, 71 Jaguar XJ6 LS1, 08 Supercharged Tundra
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