Decat 14b R1, how loud?

[Atlas 12v]

Does anyone know the db for a 14b Big Bang R1 with a 2/3 Akrapovic system?

Have my first TD in it in a couple of weeks and don't have any baffles. Trying to decide whether to buy some in case it's over the limit.

[R1 Dave]

I can't directly answer the question, however, my '15 Big Bang R1 with 3/4 Akra system is over 120db so I'd be suprised if the earlier revision of the engine was quiet enough for track days with an unbaffled Akra system.

[Atlas 12v]

120db wow!

Probably be buying a couple of baffles then.

[R1 Dave]

I think that's accurate. I know people struggle to get them through noise tests with any can on. Your model may well be better though.

[Gavia]

R1 Dave said:

I can't directly answer the question, however, my '15 Big Bang R1 with 3/4 Akra system is over 120db so I'd be suprised if the earlier revision of the engine was quiet enough for track days with an unbaffled Akra system.

120dB? At what rpm? If it's putting out 120 at 5500 which is the rpm they should test at, then it will be unbearable for anybody in the vicinity of your bike when above 8000rpm and not far off it at 5500rpm.

I know we had a little spat the other day, but that is genuinely ridiculous if accurate. I'm not looking to start it up again, I just don't understand how that can be fun for you to ride with that volume of noise around you permanently.

[tight5]

Mine was 104.5 db @ 5500rpm with 2 Akra carbon cans - no baffles and Akra decat.
Noise limit at the track (Croft) was 105 db.

[Rawwr]

120db is 32 times louder than a Henry hoover.

[R1 Dave]

Hmmm. I think I may have got my figures wrong! I've never tested it personally, I just remember someone complaining that they couldn't get through the noise testing. I thought 120db was the figure given but my memory may be playing tricks. It is loud, louder than I'd like given a choice, but maybe not that loud then! I'll see if I can find the article.

[Mastodon2]

I used to have a car in the 120db range and it was way, way louder than any bike I've heard, even stuff with no cats and cut off shorty pipes.

[R1 Dave]

I can't find the article I was basing my post on (it was a magazine feature comparing exhausts) but the only figure I can find elsewhere says it's 107db so I was well off, apologies. Still over the 102 limit that I'm told most UK tracks run.

Apologies again for the confusion.

Dave

[R1 Dave]

Gavia said:

R1 Dave said:

I can't directly answer the question, however, my '15 Big Bang R1 with 3/4 Akra system is over 120db so I'd be suprised if the earlier revision of the engine was quiet enough for track days with an unbaffled Akra system.

120dB? At what rpm? If it's putting out 120 at 5500 which is the rpm they should test at, then it will be unbearable for anybody in the vicinity of your bike when above 8000rpm and not far off it at 5500rpm.

I know we had a little spat the other day, but that is genuinely ridiculous if accurate. I'm not looking to start it up again, I just don't understand how that can be fun for you to ride with that volume of noise around you permanently.

There's no hard feelings here or any chance of 'starting anything up'. As above my memory made an arse of me, it's nowhere near 120. The only post I could find says 107 so considering how loud I know that is, 120 would be truly unbearable!

[mad4amanda]

H Guys former Noise Tester here for MSV . I would expect it to be in the region of 103 to 108 dB @5500 rpm
depending on other mods and location and atmospherics.
It may well fall foul of drive by readings too especially if ridden well. If at Brands once its failed out on track you only get one chance to drop it down then if it fails again that bike does not go out again that day!
Buy baffles, wrap and stainless wire. and check between sessions too.

[Atlas 12v]

mad4amanda said:

H Guys former Noise Tester here for MSV . I would expect it to be in the region of 103 to 108 dB @5500 rpm
depending on other mods and location and atmospherics.
It may well fall foul of drive by readings too especially if ridden well. If at Brands once its failed out on track you only get one chance to drop it down then if it fails again that bike does not go out again that day!
Buy baffles, wrap and stainless wire. and check between sessions too.

Thanks. They have got very strict. "Noise man" in every briefing.

Best get some ordered. Rather spend £40 than lose the cost of the TD.

[sjtscott]

I know not everyone will have studied the maths, physics or engineering as subjects to understand db scale isn't linear. This article might help those understand who maybe interested.

http://www.explainthatstuff.com/soundlevelmeters.h...

One comment is that I find it amazing people have to quieten their bikes down to do some trackdays. Lol so it's not too loud for the Sunday morning blast on the road then? Each to their own.. I've always enjoyed the more stealthy approach to fun riding personally.
I'm sat with my flat window open in zone 2 of London and have heard a number of IL4s with race cans on being thrashed around already this morning. I'm sure they're having fun indeed.

[Atlas 12v]

But loud cans save lives.

Mine is purely for self preservation

[R1 Dave]

I didn't buy mine for the noise, if it could be fitted with a baffle then I would do so. Sadly, however, it can't be so im rather stuck with the noise.

[sjtscott]

Atlas 12v said:

But loud cans save lives.

Mine is purely for self preservation

LOL of course.. I really don't know how I've survived 20 years on either OE or road legal aftermarket exhausts.
I admit I ran race cans on my previous Blackbird for about 3 months (after being duped into buying them by the seller telling me over the phone they were baffled) just to try them out but they were just too god dam loud day to day, so I added aftermarket db killers which didn't really help LOL I replaced them with identical looking E marked road legal cans which although much louder than the original cans didn't announce my presence 5 mins before I actually arrived

[WaferThinHam]

R1 Dave said:

I can't directly answer the question, however, my '15 Big Bang R1 with 3/4 Akra system is over 120db so I'd be suprised if the earlier revision of the engine was quiet enough for track days with an unbaffled Akra system.

I assume you're running the stubby Akrapovic and a decat link? If so 115-118 isn't uncommon.

The 14B is a completely different bike to the 2CR, so should be a lot quieter than the set up you run. Depending on the cans/system on it there should be baffles available to bring it down a wee bit. I would expect 98dB days to be beyond you, but you should be able to get it onto 102dB days.

[R1 Dave]

WaferThinHam said:

R1 Dave said:

I can't directly answer the question, however, my '15 Big Bang R1 with 3/4 Akra system is over 120db so I'd be suprised if the earlier revision of the engine was quiet enough for track days with an unbaffled Akra system.

I assume you're running the stubby Akrapovic and a decat link? If so 115-118 isn't uncommon.

The 14B is a completely different bike to the 2CR, so should be a lot quieter than the set up you run. Depending on the cans/system on it there should be baffles available to bring it down a wee bit. I would expect 98dB days to be beyond you, but you should be able to get it onto 102dB days.

Yes that's right, the Akra slip on and Akra de-cat link pipe. I did the slip on first and it was barely any different to stock so I de-catted it and it's too loud really but there's no middle ground, I don't want to put the cat back on as I'll have to flash the fuelling back to stock and I can't fit a baffle! Only real option is to fit the Akra evolution full system but that's silly money, the current setup cost me £1k and the Evo kit is even more.

I won't be doing any track days on it myself, I just can't bring myself to risk so a large amount of money on track.

[cmaguire]

R1 Dave said:

Yes that's right, the Akra slip on and Akra de-cat link pipe. I did the slip on first and it was barely any different to stock so I de-catted it and it's too loud really but there's no middle ground, I don't want to put the cat back on as I'll have to flash the fuelling back to stock and I can't fit a baffle! Only real option is to fit the Akra evolution full system but that's silly money, the current setup cost me £1k and the Evo kit is even more.

I won't be doing any track days on it myself, I just can't bring myself to risk so a large amount of money on track.

Have you had it noise tested? If so ,where and with what?