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Old 06-18-2012, 01:23 PM
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GUILLOTINE
 
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one glasspack or tri bend? benefits????

thankyou for viewing this,


ok so i have a hyosung gtr great south Korean bike, depending on what the 411 depends if i do it t0 my truck as well


so what it is i am asking, is if i put say a 24" glasspack muffler , then put 180 degree mandrel and welded on another glasspack, then another 180 mandrel then another glasspack, so 3 underneath each other, would that benefit? sound wise, as i thought sound would travel through 3 glasspacks, but then i thought that sound would hit the mandrels as well, so glasspack -->sound absorbed-->mandrel sound not . so glasspacks deepen, but would the mandrel give a high resenation, such as header to 1 glasspack would that equal to being the same as 3 with non glasspacked mandrels? as im wondering if i should go for 1 glasspack or go for three if benefits more.

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Old 06-19-2012, 09:48 AM
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Huh ?????????

I dont understand what your trying to do...getting better sound? more quiet? more power?i think the factory that built the bike,did their best to get sound,quiet and power.with 3 mufflers and those bends,you are increasing the back pressure too much...
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Old 06-19-2012, 09:55 AM
How fast is fast enough?
 
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I would do a minimum of six glasspacks, 3 on each side. Send pics and video in when you're done.
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Old 06-19-2012, 12:15 PM
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i see what you mean

basically what i meant was if i had 3 glasspacks underneath each other first two connected by mandrels 3rd 1 at the bottom being the outlet would it deepen, but seemingly as you said "you are increasing the back pressure too much" that is obvious that would destroy the engine, slowly, so ill just go for one 33" to make the difference ill put pics and vids up as soon as it's done or at least something, any other ways of deepening an exhaust note bar glasspacks?
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Old 06-19-2012, 12:18 PM
How fast is fast enough?
 
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Throw the glass packs away, run a welded thrush muffler or a dynomax.
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Old 06-19-2012, 03:25 PM
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interesting

oh, new ideas, fantastic im open, so could you tell me some info on them?
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Old 06-19-2012, 10:44 PM
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What's to tell? Try YouTube for some videos maybe.
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Old 06-20-2012, 03:48 AM
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got some

found some videos and sound clips, sound rather nice, bullet does as well, also instead of it going out the back like every other bike, how about bending around on the side like a side pipe on a v8, or maybe a small stack? i can do more things to the truck but limited on the bike. something different than the rest ya dig?

but loving the dynomax, and the thrush, although going onto dynomax website thrush emblem was there so i assume partnership? but i do like.
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Old 06-20-2012, 05:11 AM
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My son's team built a collegiate Formula SAE car using a 600 cc 4 cylinder motorcycle engine, and they had to fit the exhaust into a relatively tight package. The pipe came off the header pointed to the rear. The pipe ran to a point just behind the engine and had a mandrel 180 degree bend before attaching the muffler. The muffler was a straight-thru glasspack that was parallel to the engine (on the side), pointing forward. On the end of the glasspack there was a short 90 degree bend pointing out to the side of the car.

They tuned it on a dyno before installing it, and it ran very well in competition. However, I believe the potential horsepower was limited by the rule on the max size of the throttle body intake, so the flow of the exhaust was probably not a limiting factor. During competition they switched to a slightly longer glasspack because they did not pass the decibel noise test during the first inspection.

The college Formula SAE teams do extensive custom tuning to stay within the rules and still get max power from a small engine, and most of them use Megasquirt or other highly tunable CPUs. If you are going to make big changes in your bike exhaust, you may have to do similar tuning to compensate for the flow changes.

Bruce
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Old 06-20-2012, 11:05 AM
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thanks

i do have friedns with dyno's and have other parts to help compensate from the muffler mod. ill take the whole test thing on board as they say, and will do that before i use it full. thankyou
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