Discussion
) and he does, or at least used to, rent some out. Give him a 
or 
oli_quick said:
Does any know what my db levels would be - about...
standard 4.5, cats still in place, sports backbox....
And how could I (if required) get this below 100db...silencers? Where and how much - can I hire them?
Thanks again
standard 4.5, cats still in place, sports backbox....
And how could I (if required) get this below 100db...silencers? Where and how much - can I hire them?
Thanks again
My 4.2 with cats & quite noisy sports back box measured 104db at Brands Hatch if that helps.
oli_quick said:
Does any know what my db levels would be - about...
standard 4.5, cats still in place, sports backbox....
And how could I (if required) get this below 100db...silencers? Where and how much - can I hire them?
Thanks again
standard 4.5, cats still in place, sports backbox....
And how could I (if required) get this below 100db...silencers? Where and how much - can I hire them?
Thanks again
Mine is the same spec. I was measuredd at Castle Combe last year at 117db, but nor confident their db meter was functioning correctly. Measured a few week ago, again at CC at 99db with track silencers. Got mine from ACT. About £120 delivered including clamps, vat etc.
I was going to buy a sound meter to try and avoid getting turned away at trackdays but the meters I looked at all had a error tolerance of 1.5 db either way which I think makes a nonsense of the track testing when +1 db can make the difference between getting through and getting turned away.
dempsey said:
I was going to buy a sound meter to try and avoid getting turned away at trackdays but the meters I looked at all had a error tolerance of 1.5 db either way which I think makes a nonsense of the track testing when +1 db can make the difference between getting through and getting turned away.
I used to think that until I realized the meters used at certain track days were the exact same ones that you could get in the Maplins catalogue... FUBAR said:
Its a bit of a mystical art akin to rolling road variences 
General census of opinion is 2/3 rev range and 1 meter back, at 45 degrees. Im sure they where standing directly behind at the Ring recently, which failed a number of Cerbs.
General census of opinion is 2/3 rev range and 1 meter back, at 45 degrees. Im sure they where standing directly behind at the Ring recently, which failed a number of Cerbs.
Have to dissagree with you there. The exact requirement and details of measurement are given in the MSA 'blue book' (the offical rule book of the MSA), the problem I've encountered is that the noise meters aren't calibrated, so there isn't any consistancy, I can be 102dB at one event and 106dB at another, and as the dB scale is logarythmic in progression that's a hell of a difference. All the 'blue book' states is that the meter should be calibrated regularly, but hey, every 5 years is regularly!
You are nearly correct in the details that you've given, with one small correction: 2/3 revs @ 45°, 0.5m from exhaust.
Tim
byker28i said:
Castle Coombe wanted 4000 revs and measured it 0.5m away, althought their website says 4500 revs. With this I got 104.6db with cats and sports rear box.
Abingdon want 3/4 max revs at 0.5m - that's what 5500 revs? Nah I'll keep it down to 4K again I think.
Abingdon want 3/4 max revs at 0.5m - that's what 5500 revs? Nah I'll keep it down to 4K again I think.
Yep, funny how the AJPV8 will only rev to 5500 at various venues. Mine has the same problem.
Tim
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