Aem Vs. Unorthodox

[GSteg]

i get it now (although i only have about 10% of the info in my head right now) great info. someone should make this thread a sticky.

[Frostbyte]

Originally posted by ivymike1031
Looking at inertia changes only: For an accelerating dyno run, that's what the results will show, but they are not an accurate reflection of what is happening. An acceleration dyno is measuring acceleration of a drum, not the actual engine power output. As I've said before, power has not changed, but acceleration has. Just like when you eat less at McDonalds- a lighter vehicle accelerates faster for a given amount of power.

Looking at reduced accessory drag: an underdrive pulley will reduce the drag on the engine, and thus increase power output, but this has nothing to do with the change in inertia. That is my biggest complaint about what the unorthodox site says - they attribute a power change to reduced inertia. They even say that the drag reduction is only about 15% of the power benefit - which is incorrect. Reduction in drag accounts for 100% of the increase in engine power, but may only account for a small portion of the increase in acceleration.

Ivy I must admit you are a hell of a lot sharper on this then I am. I envy your knowledge.