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Old 10-23-2013, 04:35 PM   #21
GABRIEL
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You will be smoother in the turns because you will not automaticly go to a completely closed throttle. Like the on and off when you are trying to roll on. Carry more corner speed.
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Old 10-23-2013, 04:38 PM   #22
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4k for the track 3.5 for mild streets...
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Old 10-23-2013, 04:44 PM   #23
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Quote:
Originally Posted by GABRIEL View Post
You will be smoother in the turns because you will not automaticly go to a completely closed throttle. Like the on and off when you are trying to roll on. Carry more corner speed.
Makes sense. I will try setting it a bit higher and see how it goes. Ha.
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Old 10-23-2013, 04:57 PM   #24
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Quote:
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4k for the track 3.5 for mild streets...
I dont think anyone sets it that high for the track. I have not messed with mine. But it sure helps in the lot.
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Old 10-23-2013, 06:04 PM   #25
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Keep it out and you won't have to worry about idle
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Old 10-24-2013, 08:12 AM   #26
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Originally Posted by bumblebee View Post
Sure.
How is the idle RPM controlled?
By the adjustment of the angle of the throttle butterflies. The farther they are open the more air goes through, the fuel injection compensates and supplies more fuel, voila! Higher idle.
The reason it reduces engine braking is, when you go off the throttle, say, approaching a turn the butterflies return to their closed position. In this case, they close less which means increased air etc... Voila! Less engine braking.

Of course this is a simplified explanation, but as an Aircraft Mechanic I can do that and it's ok. Somebody told me that.
So, this would be a significantly higher idle speed? Like around 4k rpm?
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Old 10-24-2013, 10:05 AM   #27
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I usually have my idle at around 1700rpm for track/race use.

reason being to have higher idles is for smoother downshifting. you'll see just about every pro team's bike having higher than normal idles as well.
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Old 10-24-2013, 10:14 AM   #28
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Quote:
Originally Posted by lisiecki1 View Post
So, this would be a significantly higher idle speed? Like around 4k rpm?
If you don't want the engine to brake, don't close the throttle. How hard is that?
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Old 10-24-2013, 10:15 AM   #29
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Quote:
Originally Posted by houseofpaint View Post
I usually have my idle at around 1700rpm for track/race use.

reason being to have higher idles is for smoother downshifting. you'll see just about every pro team's bike having higher than normal idles as well.
I didn't think about that, it makes more sense to me than the engine braking scenario.
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Old 10-24-2013, 10:16 AM   #30
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Quote:
Originally Posted by Bevo View Post
If you don't want the engine to brake, don't close the throttle. How hard is that?
That's kind of what I was getting at. It sounds like an issue that would be more easily corrected with throttle control.
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Old 10-24-2013, 10:17 AM   #31
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Quote:
Originally Posted by lisiecki1 View Post
That's kind of what I was getting at. It sounds like an issue that would be more easily corrected with throttle control.
Bingo, cause my throttle tends to change the rpms
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Old 10-24-2013, 10:18 AM   #32
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Quote:
Originally Posted by Bevo View Post
Bingo, cause my throttle tends to change the rpms
No it doesn't. That's all in your head.
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Old 10-24-2013, 10:22 AM   #33
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Quote:
Originally Posted by lisiecki1 View Post
No it doesn't. That's all in your head.
That's quite possible
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Old 10-24-2013, 11:11 AM   #34
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Quote:
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I didn't think about that, it makes more sense to me than the engine braking scenario.
Its just a preference thing. Many racers have the idle set high, I suppose many others don't.
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Old 10-24-2013, 12:36 PM   #35
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Quote:
Originally Posted by houseofpaint View Post
I usually have my idle at around 1700rpm for track/race use.

reason being to have higher idles is for smoother downshifting. you'll see just about every pro team's bike having higher than normal idles as well.
Quote:
Originally Posted by lisiecki1 View Post
I didn't think about that, it makes more sense to me than the engine braking scenario.
I disagree with this. What is the purpose of having a slipper. I had also read the they have the ecu's set to provide less engine braking so they carry more speed into the turns. I can see how the idle would benifit them when they go from zero throttle to rolling on. They would never be at a fully closed throttle when off the gas.
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Old 10-24-2013, 01:25 PM   #36
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Not all bikes have slippers, especially in the past. Now that they are common that reason to set the idle high is less valid.
Some say it helps with smoother shifts and it also might help with the jerky throttle response some bikes have at small throttle openings.

I'd say set it a little high, play with it, see if it makes things better for you. If not it's easy enough to go back to the way it was.
If you like it keep playing with it until your mom catches you...
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Old 10-24-2013, 02:53 PM   #37
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the 4k comments are just with you....

Your ZX7 is old school. Like my CBR1000 2006. I always idle it up. NO SLIPPER CLUTCH. If I stab the front brake when using stock idle, the rear tire chatters endlessly and the bike won't settle into a corner. This happens in 2nd and 3rd gear, no clutching or shifting, just stabbing the brakes it chatters. Basically, the drag of the motor is causing the rear tire to lose traction when 95% of the weight is on the front tire while braking. I purposely brake hard enough to lift the rear tire off the ground at least every other lap on the pit straight at MSRH. Idle up vs not is the difference between making it into Sugar and Spice smoothly, versus ending up almost in the gravel running wide.

If I idle it up to 2200, the bike coasts into corners with no loss of traction. Downshifts are much smoother. As GABRIEL said, on and off throttle transitions in the corners are much smoother as well, which lets you focus your attention another 50 feet around the corner, not on the here and now. Sure, on newer bikes, you can remap the ecu to reduce engine braking, and the slipper handles the rest. Old bikes, you have to play with it as you get better and better at riding.

Idle (1100 rpm) vs fast idle (2200 rpm) is probably good for 1 - 2 seconds a lap difference for me at MSRH.

I tell all my NOVICE students to turn their idle up to at least 1500 rpms in the name of smoothness.

IT WORKS!
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Old 10-24-2013, 03:43 PM   #38
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Thats some good to know.
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Old 10-24-2013, 03:44 PM   #39
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I have the same bike (07 zx6r) and use it only on track. It has the best oem slipper in the business.

I keep my idle around 1600. Still has enough engine braking but doesn't have the empty feeling of really high idles.
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Old 10-24-2013, 04:23 PM   #40
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Quote:
Originally Posted by bumblebee View Post
Sure.
How is the idle RPM controlled?
By the adjustment of the angle of the throttle butterflies. The farther they are open the more air goes through, the fuel injection compensates and supplies more fuel, voila! Higher idle.
The reason it reduces engine braking is, when you go off the throttle, say, approaching a turn the butterflies return to their closed position. In this case, they close less which means increased air etc... Voila! Less engine braking.

Of course this is a simplified explanation, but as an Aircraft Mechanic I can do that and it's ok. Somebody told me that.
Most engines have an idle air control valve, usually a solenoid or stepper motor that allows air into the engine. The angle on throttle body butterflies should stay the same, the idle motor is what's letting more air in.
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