 exhaust performance question?
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Joined: May 2009
Posts: 119
Adjunct
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OP
Adjunct
Joined: May 2009
Posts: 119 |
so i was checking out the thunder bike pipes over at their website and they're claiming a 15bhp increase?!is this a myth?and could i get similar results from just removing the baffles from my short TORS and rejetting?
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Re: exhaust performance question?
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Joined: Sep 2007
Posts: 1,668
Learned Hand
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Learned Hand
Joined: Sep 2007
Posts: 1,668 |
That seems mighty optimistic about the Thunderbike pipes! I wouldn't hold my breath for it... 
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: exhaust performance question?
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
I get exhausted from hearing all these pipe dreams which by the way, baffle me. 
Live to love, love to live.
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Re: exhaust performance question?
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Joined: Jun 2007
Posts: 605
Adjunct
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Adjunct
Joined: Jun 2007
Posts: 605 |
I think that's one of Aesop's Fables.
Aaron
04 "Green Bean" Freaked, AI removal, Bafflectomy, 6" Risers, and 30" Drag Bars.
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Re: exhaust performance question?
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Joined: May 2009
Posts: 119
Adjunct
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OP
Adjunct
Joined: May 2009
Posts: 119 |
that's pretty much what i thought.....
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Re: exhaust performance question?
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Joined: Sep 2006
Posts: 1,457
Learned Hand
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Learned Hand
Joined: Sep 2006
Posts: 1,457 |
You open up the exhaust and intake with proper jetting and needles and it will feel like 15 HP.
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Re: exhaust performance question?
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Joined: Jan 2005
Posts: 8,639 Likes: 3
Old Hand
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Old Hand
Joined: Jan 2005
Posts: 8,639 Likes: 3 |
You can get a big gain from their pipes but there are a lot of ifs involved. First, if you have an 875 engine with stock cams, you will gain little or nothing because of the crappy valve timing. Second, if you have already opened up the intake and didn't realize any significant results because of the restrictive stock pipes, you will gain a lot with better pipes.
A couple of years ago, Thunderbike published a lot of their dyno tests on this site and their thoroughness in testing and results were impressive.
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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Re: exhaust performance question?
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Joined: Jan 2005
Posts: 6,308 Likes: 4
Worn Saddle
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Worn Saddle
Joined: Jan 2005
Posts: 6,308 Likes: 4 |
I don't know about 15hp, but they do make a big difference. I have had several different pipes and they are by far the best of the lot.
A word to the wise is not necessary. It is the stupid ones who need the advice.
Pat
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Re: exhaust performance question?
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Joined: Feb 2007
Posts: 23,219 Likes: 61
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,219 Likes: 61 |
I doubt 15 hp on just the pipes, but I gained quite a bit with my gutted stock pipes coupled with the pod filters and cleaning up the intakes so there were not mismatched surfaces (blueprinting).
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: exhaust performance question?
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Joined: Aug 2007
Posts: 10,729 Likes: 5
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,729 Likes: 5 |
here are the numbers from Thunderbike, I'm not seeing 15hp on pipes alone 
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: exhaust performance question?
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Joined: Jan 2005
Posts: 122
Adjunct
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Adjunct
Joined: Jan 2005
Posts: 122 |
The 15+ Hp was reported on a 790 America/Speedmaster.  The gain was less on the 865. My BA -02 was dynoed 10 hp+ when I put the Thunderbikes pipes on but that was not from scratch, it was already modified with 'no snorkels', 'UNI-filter', etc Hasse
Hasse TBA -02 Pre-Fire Cardinal Red, Wiseco 904, Thunderbike pipes, Freak
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