I H Freelance Services Posted July 24, 2015 Share Posted July 24, 2015 i was noise tested today at oulton park i have a bec westfield it came out at 93 db which was lower than ever before normaly its 97/98 but the last time i was tested at oulton it was 101 i have not made any alterations to the car at all i questioned this at the time as a fellow bec car was told he was over the noise limit i said that days reading must be wrong but they said the meter had been calibrated so he must make some mods to his car to pass , the inconsistency of noise test results is a real problem i expect some variation between different track day organisers but not the massive variation from the same organisers there excuse was today was that it depends on the weather ! so how can they fail you one day and pass you the next very confusing 1 Quote Link to comment Share on other sites More sharing options...
s2rrr Posted July 24, 2015 Share Posted July 24, 2015 Our group of 3 Westfields has been failed on noise test a few times in the last 6 months at Oulton. Independent testing has shown that they are borderline but used to pass ok. On track monitoring is causing some grief as when you are giving it some beans they tend to be noisier. All XE engine cars and very close to the limit noise wise. Bob Quote Link to comment Share on other sites More sharing options...
Lawrie Posted July 24, 2015 Share Posted July 24, 2015 There seem to be two types of environmental scrutineers. Those that read over and those that read under. Sound level meters usually have a calibration device. My car was never designed to idle at 4,500 rpm, so the noise at that speed has nothing to do with reality, but until we invent something better...... I've never failed a test, but I might next week. That's what XEs are for Quote Link to comment Share on other sites More sharing options...
I H Freelance Services Posted July 24, 2015 Author Share Posted July 24, 2015 its the variation in the readings that baffles me Quote Link to comment Share on other sites More sharing options...
Lawrie Posted July 24, 2015 Share Posted July 24, 2015 its the variation in the readings that baffles me Being near a wall that reflects the sound can increase the reading by about 10dB (it should be less, but this is what I'm told). Always make sure you're 20 metres (see Blue Book for exact measurement) from any obstruction, and offer some new duracells Quote Link to comment Share on other sites More sharing options...
daggartuk Posted July 24, 2015 Share Posted July 24, 2015 its the variation in the readings that baffles me No pun intended? Quote Link to comment Share on other sites More sharing options...
I H Freelance Services Posted July 24, 2015 Author Share Posted July 24, 2015 no erm yes ! clever eh Quote Link to comment Share on other sites More sharing options...
AdamR Posted July 24, 2015 Share Posted July 24, 2015 I've found temperature to cause readings to vary by up to 6db, always get the car hot before testing if you're close to the limit Quote Link to comment Share on other sites More sharing options...
dhutch Posted July 24, 2015 Share Posted July 24, 2015 Given the knock in effect of failing, its a huge issue, but appears to be some head-in-the-sand going on. Daniel Quote Link to comment Share on other sites More sharing options...
I H Freelance Services Posted July 28, 2015 Author Share Posted July 28, 2015 at brands today msv 97 db which is correct according to my noise meter when i tested car at home so far this year msv 95 cadwell 101 msv oulton 91 msv oulton and 97 msv brands very consistent not ! passed them all but thats not really the point Quote Link to comment Share on other sites More sharing options...
Cleggy the Spyder Man Posted July 28, 2015 Share Posted July 28, 2015 at brands today msv 97 db which is correct according to my noise meter when i tested car at home so far this year msv 95 cadwell 101 msv oulton 91 msv oulton and 97 msv brands very consistent not ! passed them all but thats not really the point You will only spin it or break it if you do make it onto track anyway so don't worry about it :-p Quote Link to comment Share on other sites More sharing options...
shrops-paul Posted July 28, 2015 Share Posted July 28, 2015 i was noise tested today at oulton park i have a bec westfield it came out at 93 db which was lower than ever before normaly its 97/98 but the last time i was tested at oulton it was 101 i have not made any alterations to the car at all i questioned this at the time as a fellow bec car was told he was over the noise limit i said that days reading must be wrong but they said the meter had been calibrated so he must make some mods to his car to pass , the inconsistency of noise test results is a real problem i expect some variation between different track day organisers but not the massive variation from the same organisers there excuse was today was that it depends on the weather ! so how can they fail you one day and pass you the next very confusing And breathe Quote Link to comment Share on other sites More sharing options...
I H Freelance Services Posted July 29, 2015 Author Share Posted July 29, 2015 drivers excuse no 1 it was the car not me , found the break bias adjuster bar lock nut had come undone and wound it self to the rear so when i hit the panic pedal it spun me round Quote Link to comment Share on other sites More sharing options...
Cleggy the Spyder Man Posted July 29, 2015 Share Posted July 29, 2015 drivers excuse no 1 it was the car not me , found the break bias adjuster bar lock nut had come undone and wound it self to the rear so when i hit the panic pedal it spun me round Quote Link to comment Share on other sites More sharing options...
dhutch Posted July 29, 2015 Share Posted July 29, 2015 95 msv cadwell 101 msv oulton 91 msv oulton 97 msv brands very consistent not ! Great set of data. Having had issues myself in the past, I can really feel the pain of someone who has, say passed a 98db day at say 95-6 db, then failed a 105db limit daya month later with the same un touched car. The issue is that while that level of repeatability would be considered poor at a dedicated noise pad and top notch calibrated equipment and experienced user, on a range of somewhat make shift test areas on the side of a track using various hand held testers, I wouldnt expect very much more. What is the answer? Daniel Quote Link to comment Share on other sites More sharing options...
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