by soshowlara » Sun Feb 09, 2003 11:54 am
Here is how AEM dyno tests their products, right from their site:
"AEM's DYNO TESTING PROCEDURES
AEM performs its dynamometer testing in a consistent fashion in an effort to deliver the most accurate results. Our dyno testing procedures are carried out with the hood up, with a fan placed in front of the radiator and another fan at the rear of the vehicle to force exhaust gases from the testing area. We perform the testing in this fashion because it most accurately reflects actual driving conditions, (e.g. the open hood allows air to flow through the engine compartment as it would if the vehicle were moving, and the fan in front of the radiator mimics the flow of air that would pass through it if the car were not stationary on a dyno). Think of it this way, an RSX Type-S revs to 8,000 rpm, so a third gear dyno pull to redline is equivalent to a run of approximately 90 mph. Without an open hood or fan to replicate what the car would experience if it were on the street and not on a dyno, the testing would not be an accurate representation of either the car's performance, or the functioning of any performance parts.
Furthermore, all numbers are corrected to SAE (Society of Automotive Engineers) standards for altitude, ambient air temperature and humidity per the program supplied with the Dynojet Dyno that we use (in this case it was a Model 248C Dynojet Chassis Dynamometer). We do this because, according to SAE, horsepower should be measured under a consistent set of conditions. Since the real world is not a consistent place, a formula is used to modify the measured results obtained during testing back to the SAE accepted standard of testing conditions.
When we perform dyno testing, we take multiple runs and then average the three that are most consistent. Any runs that are abnormally high or low are eliminated so that the results we gain are as accurate as possible. We will NEVER show you only the best results; you will always see an average of the three most consistent dyno pulls."