86DRIVE & Mann Engineering's Dyno Day/Car Meet - Santa Clara, May 17

[BRZChix]

Originally Posted by Pwolf

Yea, didn't @mkivsoopra say he lives right around the corner?

so much effort lol

[PMok]

Originally Posted by cactus

Is the estimated crank power corrected? Is the "corrected" number rwhp or crank? 25%(157.8/210) drivetrain loss seems like a lot, but 5%(20x/210) seems like very little.

I asked Gary from Mann to elaborate on the different figures, and he gave us more explanation...

GARY LIU: The Engine power figure is what is actually measured to be at the flywheel or at the back end of the crank before it goes through the transmission, differential, and wheels. The dyno is able to calculate this number because it knows all the rotational mass of everything and how much torque is needed to overcome a load that is put on the rollers. From that the dyno is able to accurately measure how that power is being transferred through the rollers. This is pretty much a “raw” measurement based on the measured torque load put through the dyno rollers as the car is accelerating. This raw measurement is truly what your engine is doing based on the ambient data for those specific conditions and all the factors are taken in to account to get your calculate the engine power.

86D: And what is done then to calculate the Corrected power figure?

GL: The Corrected power figure is what is calculated based on some of the ambient data collected through some of the sensors in the dyno room. However, if you look at the print out, there is ambient temperature, intake air temperature, relative humidity, air pressure, and steam pressure and [the system] puts the relevant numbers into the SAE J1349 equation to calculate the correction factor. There are other types of correction factors we can use but we use SAE because that is what 99% of the dynos in the US use, [but] in Europe and Japan, they use different correction factors. I know of some dynos that you have to manually input some of the ambient values to be able to get the correction factor, however, MAHA included the sensors in their dyno package because they are relevant to the final output, depending on which correction factor is chosen. I looked at other dynos and with some, you would have to purchase some of these sensors separately. The point of this factor is to standardize the readings.
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read the rest of the discussion, and also, see more photos! at 86DRIVE.com

http://86drive.com/2014/05/21/more-d...ring-dyno-day/

[Clipdat]

B-B-B-Bonus pic! Comon people, I know you have more pics of this awesome meet! Post em up!

[B2FiNiTY]

That's the most beautiful dyno facility I've ever seen!