Arrow 2 into 1 - Baffles in or out? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 132 (permalink) Old 04-16-2010, 11:07 AM Thread Starter
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Arrow 2 into 1 - Baffles in or out?

I have an arrow 2 into 1 on my 2010 Bonneville SE. The baffle is so easy to take in and out I have gone both ways with it. I just completed my break-in and need to do some more experimenting, but it seems to run smoother in stop and go traffic with it in. It seems to run stronger with it out when I want to make it go. Maybe it's just the sound that makes me think it is faster. Has anyone done any dyno testing with the baffle in versus out? It would be interesting to see evidence.
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post #2 of 132 (permalink) Old 04-16-2010, 11:16 AM
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post #3 of 132 (permalink) Old 04-16-2010, 02:54 PM
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I have the Arrow 2 into 2 instead. The bike seems to pull a lot stronger with the baffles out but the noise is unbelievable!. I have been looking for a compromise sound and found it by modifying the baffle tube in various ways. The 2 into 1 is slightly different, it has more holes in it to start with but the idea is the same:

As standard it comes like this:




I then drilled more holes in it, gradually and testing the sound until it looked like a flute. Still not happy:



In the end I cut off the offending part, the perforated tube, in a slash-cut to maximise the area of the gas exit hole and this gives me a pleasant, throaty Triumph sound, that gets louder in proportion to throttle opening. One of the advantages is that I can carry a pair of slim, pressed-steel circlip pliers in my tool bag at all times, and can remove the remaining baffle part whenever I feel like an anti-social noisy burn-up and just store the bits in the bag.

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Last edited by Forchetto; 04-16-2010 at 03:22 PM.
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post #4 of 132 (permalink) Old 04-17-2010, 07:49 AM
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Baffles out! Seriously, as long as you're not sitting in your driveway laying on the throttle to piss off your neighbors, I don't see an issue. It's a motorcycle. It's gonna make some noise. It's really not that loud with the baffles out. Let it roam freely! Performance gains? who knows? Let's just say it's faster and meaner with the baffles out.

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post #5 of 132 (permalink) Old 04-17-2010, 04:42 PM
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I had the high Arrow 2-1 on my heavily modified Scrambler. It made 75hp, with the baffle out, & 67hp with it in. So it was a no-brainer which way I was going to go. I hadn't paid thousands of dollars to lift the power of my Scram, just to have 8hp robbed by a baffle! But it was very noisy (a lot worse than my old TORS or TB pipes) & often gave me a headache. I've got a Zard 2-1 low system now, with the baffle cut in half & reversed. It muffles the noise (which was outrageously loud without it) & gives me close to 80hp (thanks to Pieman)

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post #6 of 132 (permalink) Old 04-18-2010, 06:13 AM
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I've also been playing around with the Arrow 2:1 baffle on my Scrambler. With the baffle out it's simply too loud for me so wanted to have a modified baffle. However, I didn't want to start cutting the original baffle up (albeit I did try drilling a single hole in the end of the existing one which had little effect). So I decided to make a new one which I could mess about with as I liked.

The new one was fabricated from a simple stainless steel turning and a length of 1" copper pipe (1.04" ID, 1.11" OD as I measured it). The pipe is a press-fit into the machined ring and can be replaced fairly easily.

To start out with I just used a length of pipe similar to original:


You can see the bore is somewhat larger than the original baffle:


Existing circlip arangement still used:




On tickover it's quiet and gets rapidly louder with throttle opening. There is a marked 'rasp' when blipping the throttle on gear change. I'll try to make some sound files later to give you an idea what it sounds like.
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post #7 of 132 (permalink) Old 04-18-2010, 08:22 AM
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Quote:
Originally Posted by Old Scratcher View Post
I had the high Arrow 2-1 on my heavily modified Scrambler. It made 75hp, with the baffle out, & 67hp with it in.
Good to know. I have the 2 into 2 on my Thruxton and alternate running with the baffles and without. I knew it "felt" stronger without, but your post shows it's not just in my head :-) Thanks.
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post #8 of 132 (permalink) Old 04-18-2010, 05:41 PM
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I tried contacting Arrow for these kinds of info on how to modify the dB killer. They referred me to Triumph accessories email. I contacted them and they told me they don't recommand any modifications. I insisted and neither Triumph or Arrow wanted to just give me a suggestion from their technicians that must know quite a bit about how these baffles work and affect the engine. I was considering just drilling a whole at the end of the baffle on the 2 in 1 Arrow for the Scrambler. Was wondering if just drilling other holes on the site make it louder with every hole or its not that simple? And if the engine is now out of tune with the baffle modification or if its not that sensible...So many question! :P The Arrow without baffles seems WAY too loud...and with DB killer not enough. I'm really looking for something in between, if I gain a few HP, that would be fine too.
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post #9 of 132 (permalink) Old 04-18-2010, 06:42 PM
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Quote:
Originally Posted by Scrambler007 View Post
I tried contacting Arrow for these kinds of info on how to modify the dB killer. They referred me to Triumph accessories email. I contacted them and they told me they don't recommand any modifications. I insisted and neither Triumph or Arrow wanted to just give me a suggestion from their technicians that must know quite a bit about how these baffles work and affect the engine. I was considering just drilling a whole at the end of the baffle on the 2 in 1 Arrow for the Scrambler. Was wondering if just drilling other holes on the site make it louder with every hole or its not that simple? And if the engine is now out of tune with the baffle modification or if its not that sensible...So many question! :P The Arrow without baffles seems WAY too loud...and with DB killer not enough. I'm really looking for something in between, if I gain a few HP, that would be fine too.
The arrows are made in Italy and they have a habit of hinting that things would be better without the baffles without actually saying so. I also have another Italian exhaust on another vehicle (a mini buggy), and that also comes with easy to detach baffle held by a mere circlip, to make it easier.

With the fitting instructions they include a detailed page stating that on "no account must you remove the baffles..." and they even include a photo of a hand wielding a plair of circlip pliers and withdrawing the baffle... just to make sure you know what not to do.
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post #10 of 132 (permalink) Old 04-18-2010, 09:34 PM
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I'm sure I'd love the sound of NO baffle...but here cops would just LOVE to get a closer look of my bike if it was that loud...

I was planning on drilling a few extra holes on the side of baffle...would that make a good difference? Will drilling a hole at the end have a bigger impact? I'm really looking for a nice sound that is somewhere between the Arrow with a baffle and without...

The way Arrow and Triumph answered my emails sounded like they were ordered by law to say not to modify in any way their exhaust so they respect road homologation for sound.

Don't get me wrong this sounds AWESOME:
http://www.youtube.com/watch?v=F6J7nj18XWA

But loud like that I'd get arrested 3 times a day here...

Last edited by Scrambler007; 04-18-2010 at 09:36 PM.
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