Just out of curiosity... Has anyone had their 848 noise tested with the Termi end cans on? Just wondering what they come in at on the dB scale. I am a serial race can guy and my GSXR's Arrow pipe sounded amazing but was real loud and heading towards the offensive level. The Termis on my Corse though sound louder but at the same time seem less offensive than my last bike. To me they sound absolutely glorious and make the bike sound just how it should. But they must be up at the 105dB mark? Andy
Think termis are rated at 103db. Standard is around the 98 mark I think. When I was at Caldwell my termis were tested at 99 if I recall. The testers are a bit less stringent there though.
Not entirely sure. I don't trust them really. The trouble with noise testing is that the result is dependant on so many factors. The result you get in one place could be entirely different at another.
Depends on the circuit. Some are static, some are drive by. donnington, for example has a drive by on the start finish straight, with 2 other sensors out on the circuit. These are linked to the council and if the noise limit is being excessively breached the council get alerted. Same for sliverstone. cadwell is a static test, done, well supposed to be to ACU regs. Snetterton is a static too I think, and from what I've read the tester is a twat!
Iirc, the static ACU test for a twin was the sound meter held 1m away at 45 degrees to the back of the bike with the engine on a steady 4k revs. But I'm not certain it's still like that tho....that was a long time ago, but I'm sure the current test regs will be documented somewhere. The sound meters for the iPhone are actually very accurate, but as Matt says the surroundings change the readings dramatically.....even air temperature makes a difference.
Tested on a mates Extech sound meter the standard cans average at 98... that's 2 meters away level with the end... debaffled standards are 110... baffled catless standards were 112.... ran the same test on my galaxy s2 phone & the results were not that different.. +/- 1
Yikes! 110-112 is LOUD! I guess the Termis must be similar then as they are effectively the same sort if design no?
I think the termis are on a smaller bore inside the can..2.5 inch but I doubt they'd be much different
Guys, as previously said, the test is only valid for the location that you do it in. The ACU regs can be found on club MSV web site. Iirc it's 1m away, 45 degrees at 5k, but the amount of rpm goes on capacity and number of cylinders. To put it into perspective I have done trackdays at silverstone(102db limit) and donnington(105) with a full system with no trouble. All MSV circuits test to ACU regs, silverstones limit is set by the council and they only do ride by (static if you get flagged). at the end of the day if you think your bikes too loud, put baffles in. Termis, with baffles on an 848 and you can do most track days. Start mixing termis with dry clutches and increased capacity and it might get a bit more difficult to pass a static test. from experience the bikes I've seen being black flagged are IL4's with the stupid megaphone cans. A IL4 on full is a lot louder than a v-twin.
Tested mine with an iPhone app and at tick over it was around 85-88db and at 4k revs it was around 95-97db
I bet you tested at the wrong revs............................... If you're going to do it - do it right :wink: The initial test is a static test which is carried out using a handheld meter. As per ACU guidelines, each bike is measured 0.5 meters away from the exhaust at a 45 degree angle when the engine is being held at the following RPM:[TABLE="width: 100%"] [TR] [TD]Engine Size [/TD] [TD]1 cylinder [/TD] [TD]2 cylinder [/TD] [TD]3 cylinder [/TD] [TD]4 cylinder [/TD] [/TR] [TR] [TD]250cc (4 stroke) [/TD] [TD]5,500rpm [/TD] [TD]8,500rpm [/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD]400cc (4 stroke) [/TD] [TD]5,000rpm [/TD] [TD]6,500rpm [/TD] [TD]7,000rpm [/TD] [TD]8,000rpm [/TD] [/TR] [TR] [TD]600cc (4 stroke) [/TD] [TD]5,000rpm [/TD] [TD]5,500rpm [/TD] [TD]6,500rpm [/TD] [TD]7,000rpm [/TD] [/TR] [TR] [TD]750cc (4 stroke) [/TD] [TD]5,000rpm [/TD] [TD]5,500 rpm [/TD] [TD]6,500rpm [/TD] [TD]7,000rpm [/TD] [/TR] [TR] [TD]+750cc (4 stroke) [/TD] [TD]4,500rpm [/TD] [TD]5,000rpm [/TD] [TD]5,000rpm [/TD] [TD]5,500rpm [/TD] [/TR] [TR] [TD]125cc (2 stroke) [/TD] [TD]7,000rpm [/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD]250cc (2 stroke) [/TD] [TD][/TD] [TD]7,000rpm [/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD]500cc (2 stroke) [/TD] [TD][/TD] [TD]5,500rpm [/TD] [TD]7,000rpm [/TD] [TD]7,000rpm [/TD] [/TR] [/TABLE] In cases where the motorcycle has two separated exhausts the measurement will be taken as above from the median point between the two.
Blimey some noisy cans there then...my race bikes have rarely been over 105 ;-) RC8 and RSV4 seem worst (other than Desmo) and have seen a mates with 115 on the Rc8. But....Panigale has same issue as some of that is ground resonance, allegedly, so strictly speaking not all the bike.
My std 848 Evo measured 103 at Castle Combe and a mates 848 with Termi's and baffles came in at 101. They made us rev to 7000 and held the meter about 1m away at 45'.
Castle doomb is like an crusty smelly old gentlemans club where they all smell of urine and make up their own rules. Most other tracks use the ACU based system as above, but no at at Doomb. The noise puts the guys off their stroke as they abuse young boyscouts training to be marshalls. "yes Jeremy, this is the hose for putting out engine fire on the cracton wankel", "Really sir?". "Oh yes, the faster you crank the more it spurts, oh Yes OH yes OH my giddy aunt YESSSSSSSSS"
