Noise Limits

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Fliprio
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Noise Limits

Post by Fliprio » Sun Feb 23, 2014 10:24 am

Morning all

The 205 needs a new exhaust, the current system is quite quiet at 88db but weighs a lot, so looking at a lighter system which will probably get louder.

Whats the noise limits at most of the sprint events? from memory I thought someone had said 96db, but the sprint regs for Eelmoor just point me at the blue book section 5.18 which states 110db for the 0.5m static test?

Thanks

Dan

Redmist
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Re: Noise Limits

Post by Redmist » Mon Feb 24, 2014 10:00 am

All our sprints are 105 max but at Goodwood there's also an on track measuring system but that's lower at 98 or 100 --- can't recall. Blue book only shows MSA regs for sound which apply to circuits , hillclimbs etc , all the rest have there own limits. In my experience very few people who's cars pass the static test would fail the on track one. I'm normally right on the limit for static but never get pulled off track for the circuit meters. Stainless steel will always be louder than steel unless it's wrapped in carbon fibre . Basalt is a really good packing material rather than e-glass . I had to repack every other event when using e-glass but my basalt packing's been in there for 2 seasons ---- just don't ram it in tight , just use a bit of dowling to press it around the silencer with thumb and two fingers with very slight pressure. Too loose is loud , also too tight :wink:
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Fliprio
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Re: Noise Limits

Post by Fliprio » Mon Feb 24, 2014 10:12 pm

Thanks, 105 dB shouldn't be too bad to keep under with a 2 box system. It's currently mild steel, but I have seen that before going from mild steel to stainless on my mini, it just sounds different. Cheers, Dan

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