How loud is 90dB?
#1
Howdy.
Plan to participate in a trackday session where noise level is
restricted to 90dB. Will my MY00 with removed resonator, KN panel,
mild steel big bore decatted DP, decatted/desilenced Magnex centre,
and 6x4 Magnex BB go through??
Any opinions/exprience? What about other systems, e.g. full decatted Scoobysport (which I would guess is noisier)?
Simen.
Plan to participate in a trackday session where noise level is
restricted to 90dB. Will my MY00 with removed resonator, KN panel,
mild steel big bore decatted DP, decatted/desilenced Magnex centre,
and 6x4 Magnex BB go through??
Any opinions/exprience? What about other systems, e.g. full decatted Scoobysport (which I would guess is noisier)?
Simen.
#3
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MY UK94 with a Mongoose SS (decat) was something like 93 or 94 DB using the RAC MSA regs which are 0.5 metre from exhaust at 45 degrees when revved to 2/3 max revs.
It wasn't too bad on the road, just a little droning on the motorway but I put up with it for the wonder flat 4 sound.
To put it in to some perspective, my 205 Sprint car ran a Group A exhaust (until I got advised it was too noisey) it was 108Db at the same event. On the road it was horrendous. You needed practice headsets on the motorway otherwise you'd hurt your hearing at anything over 60MPH.
Cheers
It wasn't too bad on the road, just a little droning on the motorway but I put up with it for the wonder flat 4 sound.
To put it in to some perspective, my 205 Sprint car ran a Group A exhaust (until I got advised it was too noisey) it was 108Db at the same event. On the road it was horrendous. You needed practice headsets on the motorway otherwise you'd hurt your hearing at anything over 60MPH.
Cheers
#6
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British GT Marcos Mantis (GTO) is about 126.9 dB at approx. 4500rpm indoors, on a rolling road, measured at 5 metres.
To hear how loud that is, download this video, and play it at the maximum volume your PC can play it at. That will be about 1/4 of what it really is
http://www.powerstation.org.uk/Resou..._Rollers_2.mpg
Cheers
Ian
To hear how loud that is, download this video, and play it at the maximum volume your PC can play it at. That will be about 1/4 of what it really is
http://www.powerstation.org.uk/Resou..._Rollers_2.mpg
Cheers
Ian
#7
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Blackscooby - I think your figures indicate that my setup might
be touching the limits, but the non stainless DP might keep it on the 'correct' side ..... Does the Mongoose have a resonator on the midpipe? (BTW you also have a 5dr, right? ;-) )
My system was turbo back, hence included a SS downpipe.
From my recollection it had 2 silencers (whats a resonator ?)
One rear and a small mid one. Both of which were straight through jobbies you could stick a brush handle
No mine was a 4dr.
Sold just before christmas
http://members.aol.com/blackscooby25...lackscooby.jpg
be touching the limits, but the non stainless DP might keep it on the 'correct' side ..... Does the Mongoose have a resonator on the midpipe? (BTW you also have a 5dr, right? ;-) )
My system was turbo back, hence included a SS downpipe.
From my recollection it had 2 silencers (whats a resonator ?)
One rear and a small mid one. Both of which were straight through jobbies you could stick a brush handle
No mine was a 4dr.
Sold just before christmas
http://members.aol.com/blackscooby25...lackscooby.jpg
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#8
SSE,
FWIW, 90 dBA is quite a conservative limit.
My car makes about 102 dBA (Scoobysport backbox)
To put it in perspective ... in a cinema (with Dolby Surround) you will experience about 85 dbA peaks...
A dB meter costs next to nothing (30 quid ?) ... get one and measure yourself. One meter, 45°s as has been said before.
If needed, you can buy a "bung" that you can screw into your tailpipe, which will quiten it down enough to have no problem on track.
Being blackflagged on track because of noise limits really sucks.
Theo
PS: if you have or foresee to buy a home cinema ... you can use the dB meter to calibrate your system...
FWIW, 90 dBA is quite a conservative limit.
My car makes about 102 dBA (Scoobysport backbox)
To put it in perspective ... in a cinema (with Dolby Surround) you will experience about 85 dbA peaks...
A dB meter costs next to nothing (30 quid ?) ... get one and measure yourself. One meter, 45°s as has been said before.
If needed, you can buy a "bung" that you can screw into your tailpipe, which will quiten it down enough to have no problem on track.
Being blackflagged on track because of noise limits really sucks.
Theo
PS: if you have or foresee to buy a home cinema ... you can use the dB meter to calibrate your system...
#10
No Mantis GTO's are gonna cause trouble for us Scooby drivers on that trackday then....
Thanks for the replies.
Blackscooby - I think your figures indicate that my setup might
be touching the limits, but the non stainless DP might keep it on the 'correct' side ..... Does the Mongoose have a resonator on the midpipe? (BTW you also have a 5dr, right? ;-) )
Simen.
[Edited by SSE - 3/8/2002 2:55:41 PM]
#11
Oh - sorry, think I confused you with 'Blackbeast' which is 5dr....
But nice car and piccie for sure!
Anyway, resonator = sound trap, guess silencer may be the more appropriate word... I think the mid silencer usually also doubles as an expansion chamber to deny you/us the pleasure of seeing flames in the rearview mirror
But the Magnex mid which is going on my car is a straight through no-nonsense cat and silencer free thing
Simen.
[Edited by SSE - 3/8/2002 5:27:40 PM]
But nice car and piccie for sure!
Anyway, resonator = sound trap, guess silencer may be the more appropriate word... I think the mid silencer usually also doubles as an expansion chamber to deny you/us the pleasure of seeing flames in the rearview mirror
But the Magnex mid which is going on my car is a straight through no-nonsense cat and silencer free thing
Simen.
[Edited by SSE - 3/8/2002 5:27:40 PM]
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