Quote:
Originally Posted by blur
So what you are suggesting is that these dyno sheets can't be trusted?
Regardless, the flat torque curve is the most appealing aspect of the dyno result. Is there a reason this engine nailed that characteristic?
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I don't want to say too much about a blurry cellphone camera shot of a dyno sheet. If I had the actual run file I could load it into the software and look through it more to have a better idea of that specific run.
There is an SAE standard, J1349, which shows how many manufacturer dyno tests are done (GM & Ford follow this standard more than most other manufacturers). You can PM me about this if you would like more information. Those tests are done under very precisely controlled conditions and must be certified by an independent monitor. A chassis dyno pull at Billy Bob's performance is a very different animal. There's just more room for error and manipulation.
Performance shops have every incentive to manipulate the numbers. Manufacturer dyno tests still have the potential to be manipulated but overall they are done under much more controlled conditions (even though those conditions may not always represent the real world).