Reply to "Dyno run gone bad"

My understanding is that "1:1" gears in many transmissions are "straight through" (i.e. the power path does not not go through any gears.

From Wikipedia: https://en.wikipedia.org/wiki/...ansmission#Internals
"In a rear-wheel-drive transmission, the input and output shaft lie along the same line, and may in fact be combined into a single shaft within the transmission. This single shaft is called a mainshaft. The input and output ends of this combined shaft rotate independently, at different speeds, which is possible because one piece slides into a hollow bore in the other piece, where it is supported by a bearing. Sometimes the term mainshaft refers to just the input shaft or just the output shaft, rather than the entire assembly.

In many transmissions the input and output components of the mainshaft can be locked together to create a 1:1 gear ratio, causing the power flow to bypass the countershaft. The mainshaft then behaves like a single, solid shaft: a situation referred to as direct drive."

A few % of the transmitted power is lost every time it goes through a set of gears.

The ZF has no straight through path and thus is always going through at least 1 pair of gears and thus is loosing a few percent of power compared to a "1:1" gear box.