andlid Posted May 31, 2010 Share Posted May 31, 2010 Got this in the post wanted to see what db level my exhaust is... since I'm planning on tracking I wanted to make sure they'd not ban me Below is when just started cold (1600rpm) Below is when warm (500-600rpm) Below is @ 4500 rpm And this is all out! (7k limiter) Good that I had a nice size carpark to play in... bit loud... System: Full dual exhaust (not true dual as someone pointed out) 2.5" from the two HFC's Berks ending up with two Magnaflow, that I think I need replacing now Intake panel filter followed by a Kinetix SSV Velocity Manifold/Plenum. Quote Link to comment Share on other sites More sharing options...
Ian Posted May 31, 2010 Share Posted May 31, 2010 That all Quote Link to comment Share on other sites More sharing options...
andlid Posted May 31, 2010 Author Share Posted May 31, 2010 That all I know... Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 31, 2010 Share Posted May 31, 2010 Completely wrong measuring, I'm afraid You need to be measuring from 0.5m away at 45degrees. Quote Link to comment Share on other sites More sharing options...
ATTAK Z Posted May 31, 2010 Share Posted May 31, 2010 Completely wrong measuring, I'm afraid You need to be measuring from 0.5m away at 45degrees. I thought it was a bit close Quote Link to comment Share on other sites More sharing options...
andlid Posted May 31, 2010 Author Share Posted May 31, 2010 Completely wrong measuring, I'm afraid You need to be measuring from 0.5m away at 45degrees. better get back at it so (never seen the guys do it that way on a trackday (bikes) though... almost stick it into the exhaust they do... Quote Link to comment Share on other sites More sharing options...
MattMe Posted May 31, 2010 Share Posted May 31, 2010 I worked with a Porsche team and on track days there they actually put the device in the exhaust. Could be completely different equipment that's designed to be used differnetly, but it's the only experience I have! How loud/quiet is a standard UK exhaust system? Quote Link to comment Share on other sites More sharing options...
andlid Posted May 31, 2010 Author Share Posted May 31, 2010 I worked with a Porsche team and on track days there they actually put the device in the exhaust. Could be completely different equipment that's designed to be used differnetly, but it's the only experience I have! How loud/quiet is a standard UK exhaust system? I know the ones you're talking about the yhave a little metal stick that hangs inside the exhaust? No idea what to compare these values with really... need a standard exhaust... not sure nissan would like me reving one of theirs to the limiter Quote Link to comment Share on other sites More sharing options...
Animal Posted May 31, 2010 Share Posted May 31, 2010 The metal arm is so that the tester puts the meter in the right place, isn't it? When the end of the arm is touching the inside of the exhaust tip then the meter is 0.5m away and should be at a 45-deg. angle? Quote Link to comment Share on other sites More sharing options...
ATTAK Z Posted May 31, 2010 Share Posted May 31, 2010 The metal arm is so that the tester puts the meter in the right place, isn't it? When the end of the arm is touching the inside of the exhaust tip then the meter is 0.5m away and should be at a 45-deg. angle? That makes sense Quote Link to comment Share on other sites More sharing options...
andlid Posted May 31, 2010 Author Share Posted May 31, 2010 Will make a nother test tomorrow ... think the result will be similar.. Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 31, 2010 Share Posted May 31, 2010 The metal arm is so that the tester puts the meter in the right place, isn't it? When the end of the arm is touching the inside of the exhaust tip then the meter is 0.5m away and should be at a 45-deg. angle? Correct. You can use anything though, tape measure, bit of wood, whatever is laying around really. Quote Link to comment Share on other sites More sharing options...
andlid Posted May 31, 2010 Author Share Posted May 31, 2010 Will redo this on the drive tomorrow... Quote Link to comment Share on other sites More sharing options...
andlid Posted June 1, 2010 Author Share Posted June 1, 2010 right, went out and did another test. Hope it's for the judges liking Distance correct Angle More pics Cold 90.5db Warmed up 76.5db Holding @ 4.5k 98.7 Full on 118.7 So thats a bit different, happy with that! My poor wall! Some vids: @4.5k @7k Quote Link to comment Share on other sites More sharing options...
Ekona Posted June 1, 2010 Share Posted June 1, 2010 Oooh, so close... Look at where you're measuring, right by a wall: That's going to reflect the sound and give a false reading. Also the tape is going to rattle around as well if it's touching the exhaust, possibly making excess noises as well (quieter than the exhaust certainly, but of a different frequency that it could make a difference). Go and park in the road or in an open industrial estate of something, hold the sound meter and tape measure in your hand and try again. Unless you're silly tall or silly short, then that will be close enough to 45deg and is how every single trackday company I've ever been with does it too. Quote Link to comment Share on other sites More sharing options...
andlid Posted June 1, 2010 Author Share Posted June 1, 2010 Think that would be a minor change if any even! So won't bother. Quote Link to comment Share on other sites More sharing options...
Ekona Posted June 1, 2010 Share Posted June 1, 2010 What bit? The echo makes a huge difference, I've tried it myself to prove it. Also what settings are you using on the meter? Needs to be A and Fast if my memory serves correctly. Quote Link to comment Share on other sites More sharing options...
andlid Posted June 1, 2010 Author Share Posted June 1, 2010 I'll check on the track day Friday..... neighbours hate me a it is :-) What bit? The echo makes a huge difference, I've tried it myself to prove it. Also what settings are you using on the meter? Needs to be A and Fast if my memory serves correctly. Quote Link to comment Share on other sites More sharing options...
Ekona Posted June 1, 2010 Share Posted June 1, 2010 Well obviously don't do it near your neighbours! Take it to a local industrial park, no-one will give a damn then. Looking at those figures though you'll be a mile under, so no worries there. Quote Link to comment Share on other sites More sharing options...
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