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Discussion Starter · #1 ·
http://www.nissanperformancemag.com/october05/dyno/

Excellent article on how coolant temp on the dyno can affect your run.

"Does it make a difference? Take a look at the two dyno runs on the graph. These are on a Stillen Stage 2 supercharged 350Z. The first run (blue line) was done at 183 degrees and shows 317.36 peak HP with a smooth power line. The second (red line) was done at 187 degrees and shows a peak HP of 313.28 --a 4 horsepower loss with only 4 degree temperature difference! Also, notice how jagged the line is. This is the ECU reading a high temperature condition and compensating with timing and fuel changes."
 

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A good tuning shop will monitor you water temp when the do the runs to ensure you are getting consistent numbers.
 

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Discussion Starter · #4 ·
A good tuning shop will monitor you water temp when the do the runs to ensure you are getting consistent numbers.

As you can see. A difference of 4 degrees is enough to alter results.

Not all shops even wait for you to be warmed up, let alone that ideal temp.
 
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