Originally Posted by state

For reference, Shawn's 6MT G37 puts down 338 WHP with the same mods, on the same dyno. Frankly, I thought that sounded high and hoped to have about that much gain. We used the same base maps and tweaked timing here and there. Again, the big deal for me was measuring relative gain under the same conditions, on the same dyno. Incidentally, the ambient temperature never dipped below 90 dg F. I'd guess 75-80% humidity, too.

In the past, I figured 10+% additional driveline loss with an auto. However, I'd like to say that the new 7 speed auto is pretty darned good! Considering it's not a DSG-type, it shifts awfully fast. I toyed with the idea of a base/sport 7AT (even drove two) before settling on my car. So depending on your mods, I'd say that could be the difference. What mods did you have at the time? Consider too, this is a 2013; subtle countermeasure style tweaks (if present) are often under reported by the manufacture.

That has me thinking about the differences between a 370 Z and a G37. A foot or more additional driveshaft, and conventional materials as opposed to our CF unit. Little losses here and there certainly can add up to a measurable change.