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Thread: Custom QUIET Performance Exhaust

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  1. #11
    Still Plays With Cars Loren's Avatar
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    Good news, my header has made it as far as Los Angeles. It was literally on a slow boat from China.

    That inspired me to try to take some measurements today. Unfortunately, the HP & Torque measurements I'm getting from the Torque app, while mostly in a reasonable range, are extremely inconsistent. Like HP ranging from low-mid 70's to as high as 80. (yes, I know that's not accurate... wheel hp should be right about 60-65) A measurement consistency error of 10% makes it impossible to measure an IMPROVEMENT of 5%!

    I'll have to get serious about it and go to one of my secret test facilities in Mexico where I can do lots of runs on the same stretch of road, both directions, and all that. See if I can come up with some consistent power and torque numbers. Or, at least consistent acceleration times. Worst case, I think I can get consistent torque numbers by doing mid-range pulls in 4th.

    But, at least I got my baseline sound measurements. And, no, these are not scientific at all. Just quick "once or twice and done" measurements to get an idea, rounded to approximately the nearest dB. I'll drop them here in case I lose my notes:

    In-car dBA
    48 - Idle w/ no fan
    50 - Idle w/ fan on 1
    57 - Idle w/ fan on 3
    63 - Rev to 3500 rpm
    75 - Rev to 6000 rpm
    71 - Cruise at 2500 in 5th
    72 - Cruise at 4000 in 3rd
    74 - Cruise at 5000 in 1st
    83 - Accel to redline in 1st and 2nd

    Outside Car dBA
    64 - Idle at 10 feet
    73 - 3500 rpm at 10 feet
    85 - 6000 rpm at 10 feet
    50 - idle at 50 feet (ambient, couldn't hear it)
    58 - 3500 rpm at 50 feet
    69 - 6000 rpm at 50 feet
    Simplify and add lightness.

  2. The Following 2 Users Say Thank You to Loren For This Useful Post:

    Basic (05-31-2018),Daox (05-31-2018)

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