Noise limits....

[Greg]

Just looking at track opportunities - sadly the PB thing at Cadwell is just too far away - but there are bike trackdays at Castle Combe which is only an hour from me...

Their requirements include standard exhausts (ha - fat chance there!) but in any event a 105dB limit. So, given that our bikes do tend to sound better when the volume's turned up a bit, is a TRX with a set of sport pipes likely to get through a 105dB limit?

I know it's hard to judge, but my Akra is a pretty growly chap and I'd hate to book only to be told I'm too loud..

G

[Jak]

IIRC you have to have standard cans fitted to get in. Even if I'm wrong on that - it's worth getting it checked out properly if you can Greg, they're VERY strict on noise limit there as they've had a lot of trouble with local residents. A guy of my local forum was turned down with a Micron on a ZXR400.

[phuk72]

When CC say standard exhausts that is exactly what they mean - and they are very very strict - I wouldn't expect any race pipe to get through

As for the 105db limit, it all very much depends on how and where it is measured

[slow codger]

Last time we were at Cadwell, Out of the 3 Daves 2 of us were at 96 db and Trixynut was at 99 db. That at 5000 revs, held. A GSXR 1000 failed and he was told to he couldn't run, and no sticker.

Dave E.

[phuk72]

Last time we were at Cadwell, Out of the 3 Daves 2 of us were at 96 db and Trixynut was at 99 db. That at 5000 revs, held. A GSXR 1000 failed and he was told to he couldn't run, and no sticker.

Dave E.

5,000 rpm is the ACU suggested level for twins - should be measured 1 metre behind bike and one metre from floor.

Last time mine was measured like that it 104.7

[slow codger]

Well If it was supposed to be a metre............. It was nearer 2 ft as I remember. And he was so busy watching the exhaust that he didnt notice that most of us were in the 4500 - 4750 re range.

Dave E.

[cheesie]

Last time we were at Cadwell, Out of the 3 Daves 2 of us were at 96 db and Trixynut was at 99 db. That at 5000 revs, held. A GSXR 1000 failed and he was told to he couldn't run, and no sticker.

Dave E.

5,000 rpm is the ACU suggested level for twins - should be measured 1 metre behind bike and one metre from floor.

Last time mine was measured like that it 104.7

was that with the 60mm pipe or the standard 52mm akra

[phuk72]

Well If it was supposed to be a metre............. It was nearer 2 ft as I remember. And he was so busy watching the exhaust that he didnt notice that most of us were in the 4500 - 4750 re range.

Dave E.

Just read on the MSV website that they measure from 0.5m

[phuk72]

Last time mine was measured like that it 104.7

was that with the 60mm pipe or the standard 52mm akra[/quote]

That was with the Devil pipe - the standard Akra is relatively quiet next to mine (and I'm not joking)

[Swifty]

Here in OZ I have never had to submit the TRX to a niose test, which is lucky as it was recently tested for a roadworthy and was rated at 107dB