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So, if I have a 450 flywheel hp motor, and deduct 15-20% for drivetrain loss, I'm at 360 rwhp using a 20% loss, right? If I plant a 600 hp (at the flywheel) motor in the same chassis, why would I now have a 120 hp parasitic loss due to the drivetrain? I've been having a hard time buying in to percentages in drive train loss.
Only real way to do it is to get your motor on an engine dyno, flog it and document the results. Then after you put the motor back in, go to a chassis dyno shop and record your drive train losses. Each tranny, automatic or manual, rear axle, gear lube used as well as type of chassis dyno will give you different results. Chassis dyno's are notorious for mixed results. Inertia, hydraulic, and electric/magnetic will all tell a different story on the same car. When using a chassis dyno, it's all relative as long as you use the same dyno in the same shop each time you measure improvements to your motor.
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