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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning M235i dyno and Track results - 115mph

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      09-27-2015, 12:17 PM   #23
Straight6Driver
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Originally Posted by allthatisntnow View Post
Gear 6 is 1:1 but don't think it matters much (could do 5th) as long as you do all comparison runs in the same gear. 6th will result in some pretty high wheel speeds at redline.
Thanks. Will 5th result in a higher reading due to the gear ratio?
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      09-27-2015, 03:06 PM   #24
allthatisntnow
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Quote:
Originally Posted by Straight6Driver View Post
Thanks. Will 5th result in a higher reading due to the gear ratio?
Yeah it won't be 100% on power reading if its a dyno that goes off acceleration (dynojet). If its using force readings it won't matter much at all as its using speed and torque to get horsepower which won't change between gears unlike wheel acceleration. But if you're using it to compare hp gains, the delta between the 2 will be spot regardless of dyno type so you'll get a pretty accurate power increase reading. Also, the dyno operator should be clued up on how to run the car and what ratio they'd prefer to use depending on dyno type.
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