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If you dont know the FWHP and your customer expects a 15% loss then doesnt it make sense to take the RW number and assume its 85% of the FW number?
In which case math suggests you take the RW number and divide by 0.85 to get the FW number.
Now that may be lower or higher than the manufacturers claimed HP which just means its a strong/weak motor OR the driveline loss isnt 15%, but as you stated its drilled into peoples heads that it should be 15%.
So they walk away thinking they got a strong/weak motor from the factory or their mods are putting down more/less than the advertised/expected gains. Doesnt really matter which since the 15% stays standard all the time for them and their car. They just never know the exact HP number but it should be within 2-3% plus/minus the calculated number. They should be concerned only with the delta anyways.
Not trying to be a jerk, just seems logical to me. Why fudge math?
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