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Old 02-28-2010, 07:27 PM   #1
rip wolfe
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REMOVE UPPER BUTTERFLIES?

i was told removing the upper butterflies on the valve body was a good thing then another told me it was a bad thing. any imput??
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Old 02-28-2010, 08:03 PM   #2
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Search around a little. Most of the dynos I have seen only lose hp down low. In certain bike they can be programmed out. The guys even said it doesn't help any
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Old 02-28-2010, 08:20 PM   #3
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thats what im hearing more of from the dyno shops and say its a hard start when its cold
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Old 02-28-2010, 09:34 PM   #4
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i did it saw felt very little improvement no issues after 40 k and 2 years
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Old 02-28-2010, 10:05 PM   #5
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where did u notice it at?
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Old 02-28-2010, 10:06 PM   #6
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Quote:
Originally Posted by rip wolfe View Post
where did u notice it at?
sound more than anything else
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Old 02-28-2010, 10:10 PM   #7
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so no loss or gain on the top or bottom end
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Old 02-28-2010, 10:11 PM   #8
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Quote:
Originally Posted by rip wolfe View Post
so no loss or gain on the top or bottom end
throttle response was a little better but thats about it seems a little more on and off to me but it has been a few years since i removed them
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Old 02-28-2010, 10:13 PM   #9
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cool thanks man
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Old 02-28-2010, 10:20 PM   #10
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Old 03-01-2010, 12:41 AM   #11
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removed them from the 03 gsxr1k, better throttle response, but it will not idle for when its cold. i had a wideband on it and tuned the spots that were affected. you notice a drop in midrange torque, but the top end runs a little stronger. also i removed them due to running a little laughing gas (u dont want the secondary valves shutting while spraying.)

so if you are considering doing it, I personally think its a good idea. you lose a little rideability, but a powercommander will fix it.

my .02
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Old 03-01-2010, 09:07 AM   #12
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I don't recommend it on a GSXR used on the street.
It'll make a pretty decent hole in your low end.
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Old 03-01-2010, 09:51 AM   #13
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Quote:
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I don't recommend it on a GSXR used on the street.
It'll make a pretty decent hole in your low end.
+1
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Old 03-02-2010, 08:57 AM   #14
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Just bought the 07 zx6r with two brothers exhaust and k&n air filter and decided to remove the top butterflies and I end up putting them back on the following week cause my bike started to run like on high rpms! I only recomend this mod if you get a power commander or some kind of tune! Oh and it fouled up my plugs so I had to replace those as well.
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Old 03-02-2010, 09:00 AM   #15
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What bike is this on? There are good reasons not to do this on a street bike or even a trackbike for someone without impeccable throttle control.
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Old 03-02-2010, 09:52 AM   #16
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The secondary butterflies act as a choke to help start it when it's cold. We did it on our endurance bike when the secondary servo motor went out and it ran awesome. Next morning wouldn't start. Closed the butterflies and it started right up
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Old 03-02-2010, 11:00 AM   #17
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Quote:
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i was told removing the upper butterflies on the valve body was a good thing then another told me it was a bad thing. any imput??
Yea the secondary butterflies are there for a reason! So that's why I put mine back on and it runs like a champ again! So I wouldn't mess with them if I were you. Plus you will take a chance of dropping a screw in your motor if your not carefull.
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Old 03-02-2010, 11:02 AM   #18
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Quote:
Originally Posted by Romeo36 View Post
The secondary butterflies act as a choke to help start it when it's cold. We did it on our endurance bike when the secondary servo motor went out and it ran awesome. Next morning wouldn't start. Closed the butterflies and it started right up
They also prevent stumble on quick acceleration. Not so much an issue on a racebike piloted by good riders, but a problem on a street bike especially piloted by a noob.
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Old 05-17-2010, 11:13 PM   #19
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On the ZX10R forums they had some dynos showing 6hp gain in the mid range with a 1hp loss up top. However some said it was a little lean at low rpms and they were a to get out. Most recommended a Power Commander to tune out the lean condition.

I decided it's not really worth it.
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Old 05-17-2010, 11:54 PM   #20
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did to my 636, noticable difference in sound and throttle response. took it to the track and there has been no hard starts per say. seemed to be a + in my corner , but im no dyno.
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