08-07-2008, 04:21 AM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Have to try and see Bobby. dB is a tricky measurement. A measured 5 dB increase is equivalent to a perceived loudness doubling as it is a logarithmic scale not a linear one. So they may be picky. Also, I am not sure whether they use dBA, or dBC, etc . Can make a difference. As I understand the engineer does a drive-by test and a standing (RPM) test. Others could be more accurate on this?
Seems like you have the exhaust system output covered but the motor noises (induction and that LS1!) all add to the accumulation. I also suspect that they will do an average of the noise on test and not just peak values. Again others may have a better idea on this point.
Merv
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Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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