Dyno run Math - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 09-22-2012, 09:15 PM Thread Starter
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Dyno run Math

I finally got my truck on the Dyno today It was a Mustang Dynamometer the unfortunate thing was it wasnt a "diesel" dyno. It reads RPM off the ignition system and as we all know real trucks dont have spark plugs lol So my question is how I do the math to figure out exactly what Im running for Torque and Hp. My numbers are 245.8hp @ 7803RPM going 66.8mph. Torque was 208.7 @ 5626RPM going 48.3MPH. Hope you guys can help me figure this out.

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post #2 of 12 Old 09-22-2012, 09:34 PM
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the last dyno run it did they put a magnetic strip on the balancer and used a pickup to identify rpm

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post #3 of 12 Old 09-22-2012, 10:28 PM
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248hp doesn't sound unreasonable for a tuned 7.3... torque is all fubar'd though. May just have to find a load bearing dyno to test it out, or at least someone who knows how to/can dyno a diesel.

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post #4 of 12 Old 09-23-2012, 05:22 AM
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You can't get accurate readings on a non-load bearing Dyno. It doesn't put enough stress on the truck to get boost up and torque numbers.
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post #5 of 12 Old 09-23-2012, 05:23 AM
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you need to know how they figured rpm. Most likely off mph of the rear tires with a guessed gear ratio and tire size if you know what they used you can back track with your actual numbers and get those numbers back to correct.

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post #6 of 12 Old 09-23-2012, 11:12 AM Thread Starter
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He calibrated RPM off my speed told me to run it up to 1500rpm and hold it at the begining. The teacher running the dyno said something about a graph and figuring it out he said it could be done. Ill have a video of one of my runs up shortly have to get it off the girlfriends camera first. I happy i finally got it on either way I had an hour to do what i wanted and it was free. Also had it 125 before I decided 3500rpm isnt good to hold for long. I'm sure it had more in it but not worth blowing the engine. The sad thing was my brick was only 10mph slower then a 87 toyota supra so im pretty happy I havnt let the kid forget about it either lol stupid ricers

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5in straight pipe to Aussie stacks
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4in lift
Some body rust and oil leaks
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post #7 of 12 Old 09-24-2012, 05:54 AM
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That sounds all ****ed up. That doesn't sound right at ALL.

7,000rpm and 8,000 rpm??? Not happening.
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post #8 of 12 Old 09-24-2012, 06:19 AM Thread Starter
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Quote:
Originally Posted by 85_305 View Post
That sounds all ****ed up. That doesn't sound right at ALL.

7,000rpm and 8,000 rpm??? Not happening.
ya tell me about it. one point the dyno said i was doing 11,000rpm. Ik i have to cut the rpms down to figure it out. I'll talk to the teacher today when i have his class and figure this out more. Though it be nice if our trucks ran that high of an rpm lol

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ext cab
DIY 6637 Intake
5in straight pipe to Aussie stacks
PHP 6pos
Boost,tran,and EGT Gauges
4in lift
Some body rust and oil leaks
CB radio
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post #9 of 12 Old 09-24-2012, 06:24 AM
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dont bother trying to convert... just go to a real dyno that works with diesels. Those numbers look like yesterdays diarrhea after chicken wings and beer watching the game last night.
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post #10 of 12 Old 09-25-2012, 10:56 AM Thread Starter
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Quote:
Originally Posted by 85_305 View Post
dont bother trying to convert... just go to a real dyno that works with diesels. Those numbers look like yesterdays diarrhea after chicken wings and beer watching the game last night.
AHAHAHA

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304,345 miles and still running strong
ext cab
DIY 6637 Intake
5in straight pipe to Aussie stacks
PHP 6pos
Boost,tran,and EGT Gauges
4in lift
Some body rust and oil leaks
CB radio
Pretty Girl sittin next to me
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