Loss of power with new TBR CF slip-on - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 35 (permalink) Old 06-08-2007, 07:39 AM Thread Starter
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Loss of power with new TBR CF slip-on

I installed my new Two Brothers M-5 CF slip-on the other day, and now it feels like I may have lost just a little bit of power. TBR claims that you dont NEED a jet kit/new FI map to see increased HP. Are they full of crap of what? Oh yeah and TBR claims that if you dyno your bike with the CF pipe on, it voids the warranty because it will burn up the CF can. So there is no way to prove loss of power. Any suggestions? No other engine mods are on the bike. Im going to order a BMC filter today, and possibly a PCIII.
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post #2 of 35 (permalink) Old 06-08-2007, 07:54 AM
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yer new can may give its new hp on the top end by sacrificing power at the lower end. But in my experience anytyme you free up the back pressure on the exhaust it always requires at least adjusting the fuel, in yer case a fuel map etc, mine carb adjustment. So what you plan on doin next should show improvements instead of loss. and as usual others my have more insight on it.
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post #3 of 35 (permalink) Old 06-08-2007, 08:11 AM
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burn up the CF can my ass what are these guys smokin

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post #4 of 35 (permalink) Old 06-08-2007, 09:12 AM
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yea that seems off too
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post #5 of 35 (permalink) Old 06-08-2007, 10:35 AM Thread Starter
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yea that seems off too
Its right in the warranty instructions
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post #6 of 35 (permalink) Old 06-08-2007, 10:46 AM
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That sounds like ... If you cannot dyno it, how would they know there was any power increase?
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post #7 of 35 (permalink) Old 06-08-2007, 10:46 AM
 
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Its right in the warranty instructions
THat may be true... CF is not as heat resistant in terms of melting as metal, obviously...

Since a dyno run provides high rpm runs through gears several times in a row and there is no convection cooling via air rushing by, the heating can be VERY extreme. It doesn't sound too off to me... that resin that they use to form shapes out of CF could start melting ASAP and then you'd be f&*ked
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post #8 of 35 (permalink) Old 06-08-2007, 10:47 AM
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THat may be true... CF is not as heat resistant in terms of melting as metal, obviously...

Since a dyno run provides high rpm runs through gears several times in a row and there is no convection cooling via air rushing by, the heating can be VERY extreme. It doesn't sound too off to me... that resin that they use to form shapes out of CF could start melting ASAP and then you'd be f&*ked
Get a fan... a big flucking fan.
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post #9 of 35 (permalink) Old 06-08-2007, 10:47 AM
 
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burn up the CF can my ass what are these guys smokin
, if that is the case then I would not want to ride the bike hard under load for more then 45 seconds as the can may burst into flames.
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post #10 of 35 (permalink) Old 06-08-2007, 10:49 AM
 
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, if that is the case then I would not want to ride the bike hard under load for more then 45 seconds as the can may burst into flames.
Dude, flames? A carbon can looks awesome, imagine if you added REAL flames to it!? That would be so bada$$ when I was rolling down the strip cruising for chicks on my stretched busa!!!

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post #11 of 35 (permalink) Old 06-08-2007, 10:56 AM Thread Starter
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I do have to say though that with the "uncorking" of the exhaust, the engine braking is significanlty reduced.
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post #12 of 35 (permalink) Old 06-08-2007, 11:00 AM
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carbon fiber is fairly resistant to heat. After all it is used on the outer edges of the space shuttle lol.
Quote:
Reinforced carbon-carbon (RCC) consists of carbon fiber-reinforced graphite, and is used structurally in high-temperature applications, such as the nose cone and leading edges of the space shuttle.
Tho what they used is prolly alot more $$$ than a $400 muffler but lol
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post #13 of 35 (permalink) Old 06-08-2007, 11:16 AM
 
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carbon fiber is fairly resistant to heat. After all it is used on the outer edges of the space shuttle lol.
Tho what they used is prolly alot more $$$ than a $400 muffler but lol
Yeah the carbon itself isn't what is melting, it is the epoxy resin that they use to set it to a specific form... the ones on the space shuttle are obviously a different resin
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post #14 of 35 (permalink) Old 06-08-2007, 11:20 AM
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Still they should have used a resin that could withstand any operating variables the can may experienced installed on a sportbike. Just my tho.
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post #15 of 35 (permalink) Old 06-08-2007, 11:21 AM
 
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Look...it doesn't matter if this $#!T is melting or it's not melting. That doesn't make a bit of difference. If the motherF&$Kers say you can't do a dyno run then you can't do a dyno run. End of story. Unless you dont give a F$#K about a warranty.



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post #16 of 35 (permalink) Old 06-08-2007, 11:24 AM
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Look...it doesn't matter if this $#!T is melting or it's not melting. That doesn't make a bit of difference. If the motherF&$Kers say you can't do a dyno run then you can't do a dyno run. End of story. Unless you dont give a F$#K about a warranty.
Tell us how you really feel about that...

Again though, how would they know if it improved performance, unless they ran it on a dyno?
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post #17 of 35 (permalink) Old 06-08-2007, 11:25 AM Thread Starter
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Look...it doesn't matter if this $#!T is melting or it's not melting. That doesn't make a bit of difference. If the motherF&$Kers say you can't do a dyno run then you can't do a dyno run. End of story. Unless you dont give a F$#K about a warranty.
Im not going to do a dyno run. Just need to figure out why the loss of power on the low end. Could be because of the lower back pressure. Like I said, I will start with a less resrictive air filter and go from there.
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post #18 of 35 (permalink) Old 06-08-2007, 11:26 AM
 
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Look...it doesn't matter if this $#!T is melting or it's not melting. That doesn't make a bit of difference. If the motherF&$Kers say you can't do a dyno run then you can't do a dyno run. End of story. Unless you dont give a F$#K about a warranty.
Someone's a little cranky today...
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post #19 of 35 (permalink) Old 06-08-2007, 11:26 AM
 
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Tell us how you really feel about that...

Again though, how would they know if it improved performance, unless they ran it on a dyno?
I'm not saying it's not horse$#!T...but thats what they say. Maybe they are trying to F%$K you. But the proof is in the pudding. If you feel like you lost power you probly lost power. Gain it on the top? Who cares. Who runs at the top all the time?



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post #20 of 35 (permalink) Old 06-08-2007, 11:28 AM
 
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Im not going to do a dyno run. Just need to figure out why the loss of power on the low end. Could be because of the lower back pressure. Like I said, I will start with a less resrictive air filter and go from there.
... anytime you swap out your exhaust for a less restrictive aftermarket one you have to expect low end torque losses since the backpressure is decreased. However, a PCIII can fix a lot of this by leaning/richening the mixture variably across the rev range
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