10-20-2014, 06:44 AM
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CC Member
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Join Date: Apr 2014
Posts: 103
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db measurements sidepipe FIA
Have anyone done any measurements of the noise on their ERAs?
The Norwegian regulations for amateur built vehicles dictates the vehicle must meet a European sound regulation. The maximum sound level is 87db.
The microphone is to be placed 20" from the exhaust outlet, at a 45 degree angle in the direction that puts the mic the furthest away from the body.
Throttle is applied to bring the engine up to 3/4 of peak power rpm, or if that rpm is not available, 3/4 of engines maximum contructed? rpm. Say rev limiter anyone?
I´m guessing open pipes are definitely out the window, how quiet are the quiet ones at say, 4000 rpm for a 289/302/331?
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