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Old 05-28-2008, 07:40 PM   #1
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db regulations on track

im slowly making my bike track only and was wanting to make my exhaust straight pipe. first off i know it would be outtaline loud, would this be a problem at the track? second would i gain any hp this way vs. a aftermarket full exhaust? third, would a tune make it efficient or would i lose midrange even more?
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Old 05-28-2008, 07:41 PM   #2
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you'd prolly loose power with a straight pipe.
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Old 05-28-2008, 07:43 PM   #3
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If you remove the restriction in the exhaust you will lose all but upper end... that will be your increase. You should definitely program w a PCM wo question.
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Old 05-28-2008, 07:43 PM   #4
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Please please please no straight pipe...it's annoying
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Old 05-28-2008, 07:43 PM   #5
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You WILL lose power with a straight pipe

Talked with some Brit guys last night in Pearland, they gained 11hp off their full Arrow and PC3 on the 675

+1 to what BC said. Those boz bros systems are ridiculous
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Old 05-28-2008, 07:52 PM   #6
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1. Without tuning, you will lose power. Even with tuning, you'll make more power with a aftermarket exhaust.

2. Don't bring it to the track, some orgs won't allow it, and besides, it's plain annoying with no advantage to anyone, even you.
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Old 05-28-2008, 08:12 PM   #7
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i personally dont like straight pipe myself it sounds disgusting, it was just a question i had not been able to figure out myself, but how is it that GP bikes run straight pipe and make 200+ hp? is the loss of power from this compensated with motor work?
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Old 05-28-2008, 08:16 PM   #8
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Quote:
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i personally dont like straight pipe myself it sounds disgusting, it was just a question i had not been able to figure out myself, but how is it that GP bikes run straight pipe and make 200+ hp? is the loss of power from this compensated with motor work?
Yes
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Old 05-28-2008, 08:19 PM   #9
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for the sake of the corner workers out there, please do not do this

I can think of one CBR that makes me cringe every time it goes past, I hate that thing
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Old 05-28-2008, 08:58 PM   #10
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for the sake of the corner workers out there, please do not do this

I can think of one CBR that makes me cringe every time it goes past, I hate that thing
not doing it.
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Old 05-28-2008, 09:01 PM   #11
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Quote:
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for the sake of the corner workers out there, please do not do this

I can think of one CBR that makes me cringe every time it goes past, I hate that thing
might be me... lol
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Old 05-28-2008, 09:09 PM   #12
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Quote:
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i personally dont like straight pipe myself it sounds disgusting, it was just a question i had not been able to figure out myself, but how is it that GP bikes run straight pipe and make 200+ hp? is the loss of power from this compensated with motor work?
They're built for it. Just like dragsters and such.

The engineers build the engines with certain back pressure requirements on your production motorcycle, and that won't be overcome without some engine/ head work.
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Old 05-28-2008, 09:18 PM   #13
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105 db limit on sound, right??
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Old 05-28-2008, 09:35 PM   #14
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Quote:
Originally Posted by sixerSLYGUY View Post
i personally dont like straight pipe myself it sounds disgusting, it was just a question i had not been able to figure out myself, but how is it that GP bikes run straight pipe and make 200+ hp? is the loss of power from this compensated with motor work?
actually, they all run mufflers now, in one form or another. some of them are just running internal baffling on their pipes. most of the tracks they run on now have a dB restriction.

however, when they didn't run baffles, they were still making power because of where the powerband is on those bikes. they only run on the upper rpms, where straight pipes will make power. they can also tune their pipe setups to create the most amount of power possible, by changing head pipe length, diameter, shape, etc.

on your street bike you will most likely make more top end horsepower without a muffler, however, you will lose midrange and low end torque and horsepower. and you will annoy everyone around you.
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Old 05-28-2008, 09:36 PM   #15
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Quote:
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They're built for it. Just like dragsters and such.

The engineers build the engines with certain back pressure requirements on your production motorcycle, and that won't be overcome without some engine/ head work.
thanks for the legit answer
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Old 05-28-2008, 09:40 PM   #16
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actually, they all run mufflers now, in one form or another. some of them are just running internal baffling on their pipes. most of the tracks they run on now have a dB restriction.

however, when they didn't run baffles, they were still making power because of where the powerband is on those bikes. they only run on the upper rpms, where straight pipes will make power. they can also tune their pipe setups to create the most amount of power possible, by changing head pipe length, diameter, shape, etc.

on your street bike you will most likely make more top end horsepower without a muffler, however, you will lose midrange and low end torque and horsepower. and you will annoy everyone around you.
i thought about that too. they dont spend much of their time in 5 and 6k, and the only one that i can think of that looks like it might have internal baffles is honda's arrow?? or is it devil exhaust. and i really cant stand seeing/hearing squids on the street with slash cuts on non cat bikes.
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Old 05-28-2008, 09:45 PM   #17
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ive just been trying to find ways of bypass spending money on a $1000+ exhaust and obviously straight is NOT the way to go, i really dont NEED it, but everyone wants one... ugghhh i need to get a better paying job. thanks guys
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Old 05-28-2008, 09:47 PM   #18
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ive just been trying to find ways of bypass spending money on a $1000+ exhaust and obviously straight is NOT the way to go, i really dont NEED it, but everyone wants one... ugghhh i need to get a better paying job. thanks guys
I'd spend my money on suspension and tires for the moment.

It's def not a cheap sport
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Old 05-28-2008, 10:01 PM   #19
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wrd. i wouldn't spend my money on anything but tires and track time if i was to build another track bike. i could have had track days paid for for the next 10 years if i had left my bike stock. i guarantee you'll be faster after spending 1000 dollars on track time than you would spending 1000 dollars on an exhaust.
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Old 05-28-2008, 10:06 PM   #20
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wrd. i wouldn't spend my money on anything but tires and track time if i was to build another track bike. i could have had track days paid for for the next 10 years if i had left my bike stock. i guarantee you'll be faster after spending 1000 dollars on track time than you would spending 1000 dollars on an exhaust.
yeah ive basically given up on buying flashy sh@t, in fact im trying to move alot of accesories from the "look at my super duper custom bike" stage cause its my first.

P.S. youre bike had some nice stuff on it. did it ever sell?
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