Airflow Adjustment - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 9 (permalink) Old 06-28-2007, 01:50 PM Thread Starter
 
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Airflow Adjustment

I am wondering how to best adjust the airflow in the stacks on my '03 GSXR 600 to get best performance and smoothest running. I attempted it once and got it a bit smoother but it is very difficult to adjust because the bike runs so crappy with the airbox and all the other items detached. Any tricks?? I am using a mercury filled gauge (old school).

Thanks.
(yosh slip-on, T.R.E.) only mods
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post #2 of 9 (permalink) Old 06-28-2007, 02:37 PM
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Quote:
Originally Posted by Prime8 View Post
I am wondering how to best adjust the airflow in the stacks on my '03 GSXR 600 to get best performance and smoothest running. I attempted it once and got it a bit smoother but it is very difficult to adjust because the bike runs so crappy with the airbox and all the other items detached. Any tricks?? I am using a mercury filled gauge (old school).

Thanks.
(yosh slip-on, T.R.E.) only mods
isnt the 03 fuel injected thus controlled by a ecu?
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post #3 of 9 (permalink) Old 06-28-2007, 02:40 PM
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Ypou can get a less restrictive airfilter like a BMC. THe you can mod your air box (make the opening bigger). Be warned though, since you already have a slip-on you will need a Power Commander to also give it more fuel. Utherwise it will runn super lean which is not good.
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post #4 of 9 (permalink) Old 06-28-2007, 04:26 PM Thread Starter
 
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It is F.I.

The '03 is FI but a friend of mine is a mech. @ roaring toyz and he did the same deal to my '01 GSXR 1000 which is also FI and it really smoothed out the vibration. I decided to try doing it on my own since he hasn't been reachable for quite a while. Maybe the 600's just aren't as smooth as the liter bikes?? I don't really want to dump $$ into the 600 i.e.: power commander & full exhaust, after having the 1000 this one is kinda slow. I want to save the $$ for another liter bike but want this one to be as "good" as I can get it w/o alot of $$.
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post #5 of 9 (permalink) Old 06-28-2007, 05:59 PM
 
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Balancing the idle air/fuel flow between cylinders on carburated bikes is called synchronizing the carbs. The mercury tubes are attached to a port on the intake manifold and the level of the mercury in each tube is balanced to each other by turning a screw that opens or closes each throttle blade.

The same thing is done with a fuel injected bike. Although I've done it dozens of times on carbed bikes, I've never done it to a FI bike. What is the level of the mercury tubes when you hook it to your bike?
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post #6 of 9 (permalink) Old 06-28-2007, 06:00 PM
 
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well, without investing in the power commander, you wont get it as good as it can be. spend the money on it, you wont regret it.
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post #7 of 9 (permalink) Old 06-28-2007, 07:40 PM Thread Starter
 
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The level of the Merc. in the tubes at idle is between 4 to 6 Cm. Probably closer to 5.5 but the idle is very rough with the airbox and accompanying sensors detached. I did my best to adjust the balance to give an equal reading across the 4 chambers of the meter both at idle and during moderate revs. Does anyone know if it's possible to do this with the airbox and sensors all re-attached??

BTW, the levels were not even close to equal across the gauge before the adjustments.
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post #8 of 9 (permalink) Old 06-28-2007, 11:52 PM
 
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Originally Posted by Prime8 View Post
The level of the Merc. in the tubes at idle is between 4 to 6 Cm. Probably closer to 5.5 but the idle is very rough with the airbox and accompanying sensors detached. I did my best to adjust the balance to give an equal reading across the 4 chambers of the meter both at idle and during moderate revs. Does anyone know if it's possible to do this with the airbox and sensors all re-attached??

BTW, the levels were not even close to equal across the gauge before the adjustments.
I sync my carbs with the airbox on. The mercury height doesn't matter, just that they are even. If you unhook a sensor or the airbox, doesn't that tell the computer to go to a failsafe mode, which makes it run crappy?
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post #9 of 9 (permalink) Old 06-29-2007, 07:37 AM Thread Starter
 
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Originally Posted by No Worries View Post
I sync my carbs with the airbox on. The mercury height doesn't matter, just that they are even. If you unhook a sensor or the airbox, doesn't that tell the computer to go to a failsafe mode, which makes it run crappy?
yes it does. Thanks for the info. I'm gonna give this another try w/ airbox on and sensors connected.
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