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Old 10-23-2013, 01:01 PM   #1
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Idle RPM for track bike!?

What do you guys think the idle RPM should be on a track bike? I'm on 2007 Zx6r...

What are your opinions and why.
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Old 10-23-2013, 01:10 PM   #2
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Why would it need to be anything other than stock (which I believe is around 1100)?
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Old 10-23-2013, 01:13 PM   #3
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Quote:
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Why would it need to be anything other than stock (which I believe is around 1100)?
That's why I'm asking..... Maybe some think that already being slightly higher rmp may give quicker response??
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Old 10-23-2013, 01:14 PM   #4
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All a matter of preference. On that bike I like 1500-1600 rpm.
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Old 10-23-2013, 01:15 PM   #5
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Quote:
Originally Posted by 1198Rider View Post
That's why I'm asking..... Maybe some think that already being slightly higher rmp may give quicker response??
You might get quicker throttle response in a launch scenario with a higher rpm (during launch you shouldn't be at idle though), but I don't see how it would improve throttle response anywhere other than that.
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Old 10-23-2013, 01:23 PM   #6
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Set it at 4k. That might make a difference
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Old 10-23-2013, 01:50 PM   #7
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Set it at 4k. That might make a difference
Funny.
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Old 10-23-2013, 01:55 PM   #8
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depends if your secondary servo motor has failed you or not....oh wait, you ain't on a GSXR.
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Old 10-23-2013, 01:59 PM   #9
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depends if your secondary servo motor has failed you or not....oh wait, you ain't on a GSXR.
Yup. And never will be!!
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Old 10-23-2013, 02:10 PM   #10
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Quote:
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Set it at 4k. That might make a difference
fack it, double that.
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Old 10-23-2013, 02:11 PM   #11
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I was thinking that. 8k is a much better launch point. Gotta leave some for the wrist though
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Old 10-23-2013, 02:50 PM   #12
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Id say a little high also, At the AMA races a lot of the bikes were high.

I think it helps not to engine brake so hard.
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Old 10-23-2013, 03:04 PM   #13
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Quote:
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Id say a little high also, At the AMA races a lot of the bikes were high.

I think it helps not to engine brake so hard.
I could see that being a possibility, but wouldn't it only have that effect if you were trying to engine brake at that rpm?

The only mechanical reason for idling that high that I can think of would be high duration racing cams that require a higher idle speed to keep the engine running decently.
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Old 10-23-2013, 03:07 PM   #14
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Old 10-23-2013, 03:44 PM   #15
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I'll echo what Dave said, use it to tune the amount of engine braking you want. Gavin clued me into that little gem, I've been playing with that a bit at the track.

Especially if you don't have a slipper clutch, keeps the chatter down if you don't slip the clutch enough. Start low move up though.
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Old 10-23-2013, 03:44 PM   #16
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Quote:
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Id say a little high also, At the AMA races a lot of the bikes were high.

I think it helps not to engine brake so hard.
I set mine at 1500 but I ride a GSXR... Just like my hero Dave1FC. Go team 380!
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Old 10-23-2013, 03:49 PM   #17
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Quote:
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I'll echo what Dave said, use it to tune the amount of engine braking you want. Gavin clued me into that little gem, I've been playing with that a bit at the track.

Especially if you don't have a slipper clutch, keeps the chatter down if you don't slip the clutch enough. Start low move up though.
Can you explain to me how idle speed changes engine braking at any rpm higher than where the idle rpm is set?

I can't find anything about this online, and it doesn't make any sense to me.
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Old 10-23-2013, 04:22 PM   #18
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Quote:
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Can you explain to me how idle speed changes engine braking at any rpm higher than where the idle rpm is set?

I can't find anything about this online, and it doesn't make any sense to me.
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.
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Old 10-23-2013, 04:30 PM   #19
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Quote:
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All a matter of preference. On that bike I like 1500-1600 rpm.
X2
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Old 10-23-2013, 04:34 PM   #20
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Great knowledge here. Never knew....
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