Crank vs Real Numbers

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

rogue_66 wrote: motorhead_1 wrote: 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... 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

Geez Dean, how qualified do you need to be?
I could be talked into driving if ya want.....

Your numbers on a track will tell the truth. Take her over to Bandimere before you move!

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.

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.