Quote:
Originally Posted by wpmjr
PS: don't bother saying they usually run more than 1 pull on the dyno. My tech didn't know what to make of the computer warnings after the first pull so we stopped, but I later found out these were expected and can be ignored. They cleared up by the next day. Anyway, I have yet to see a big change between multiple runs anyone else has posted, and my number is in line with others who have posted here. I'm confident it is a good test.
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Bill,
When I had my car tested, Kip at
Farnbacher told me that Caymans usually need 5-8 runs to 'settle down'. When I asked him what that meant, he explained that the ECU was very adaptive and that they could keep doing runs and keep getting different results as the ECU adapted to the many different fuel/timing maps that are available. He told me that they keep repeating runs until the car starts delivering consistent results, and in his experience a Cayman would typically do this in 5-8 runs. This is called a 'Shoot Out' and considered to be the most accurate way to dyno a car. Sure enough, my car kept climbing in HP until run 4 at which point it flattened out and run 5 was near identical (294 BHP).
When I returned for my 'after' dyno, Kip did 9 runs. Why? Because the first run was very high (318.2 BHP) and then the next two runs were lower. The high first run was suggestive that there might be more power to find. But the last 5 runs were all very consistent (315 BHP). The 318 was discarded and the 315 was chosen as the median.
Linear Mode
