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Herr-Kuhn Herr-Kuhn is offline
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Join Date: Aug 2006
Location: Cincinnati, Ohio
Posts: 1,019
Just wanted to add to this post about Dyno Pull Protocol

My dyno pulls were done using the standard protocol which is to lock the car in a mid range gear and pull from a low RPM up to maximum engine speed in one gear. The above high HP pull was made in 4th gear. You always try to pick the gear that is closest to 1:1 ratio to take the effects of the transmission (torque multiplication) out of the equation. 5th is not an option as it exceeds 190 MPH which is beyond the dyno's speed limits. Remember, the inertial type dyno measures the time it takes to spin up a drum...from here HP is derived and torque is calculated.

All engine speed (RPM) data on the sheets comes directly from a tachometer signal hooked up to the car's ignition, not through calibration to the roller speed by data entry from the dyno operator. This assures the pull was made in one gear and the RPM trace is straight off of the plug pulse of the ignition.

The pulls were made using the industry accepted protocol for measuring RWHP and RW Torque on a chassis dyno. One should always inquire about the testing protocol before making a purchase decision. Make sure you know what you are reviewing and always ask youself "does this make sense"?
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Kuhn Performance Technologies, LLC
Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane.
Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane.

Last edited by Herr-Kuhn; 09-28-2007 at 03:21 PM..
Old 09-28-2007, 03:12 PM
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