Power Loss Through Drivetrain

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Its definitely not 'just' a percentage.

Its a fixed value + a very small percentage. Friction 'slightly' increases over the base friction as load increases.

A general rule is the RWD is ~70-75rwkw with the rb25det gearbox. The rb20det gearbox is a tad less.

As for the 4wd setup who knows.. Some one needs to get the motor on an engine dyno and then rolling road.

As for rwd vs awd.. there's bugger all difference. ~5rwkw.