TTS: Why is my idle timing bouncing so much ?
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Cruiser
Joined: Jan 2010
Posts: 234
Likes: 73
From: Sunshine state
Why is my idle timing bouncing so much ?
Hoping someone smarter than me can tell me what's up with my idle timing. 2019 RG 107 bored to 117, TTS-100 cam, TTS tune for this cam. Did a few auto tunes and it runs awesome.
However, the Idle RPM bounces approx 100 RPM either side of the desired 950 RPM. It's not EITMS kicking in, I know what EITMS feels and sounds like (I ride in FL).
It read (on this forum I believe) reducing idle spark control gain & max would smooth the idle. So I set them to 1 & 2 respectively (default is 4.06 & 6), and it made no difference. I also added a few VE units to idle region, but that only made it stink more at idle, no change in the flux.
I noticed on the latest DM generic run when the bike is above 0 speed the timing is rock solid, but as soon as the speed drops to 0, the timing starts bouncing around. If you look at the attached DM run you'll see this in the playback graph upper black line (R cyl timing).
I read somewhere when the bike speed is at 0 the closed throttle spark (CTS) takes over. If this is so why is the actual R cyl idle timing bouncing between 16.5 - 23 deg when the R cyl min timing setting is 23 deg for both CTS & main spark tables? F cyl timing is doing the same. Does anyone have any ideas how I can make this idle smoother?
The DM run, and tune are both attached. Thanks for any help
However, the Idle RPM bounces approx 100 RPM either side of the desired 950 RPM. It's not EITMS kicking in, I know what EITMS feels and sounds like (I ride in FL).
It read (on this forum I believe) reducing idle spark control gain & max would smooth the idle. So I set them to 1 & 2 respectively (default is 4.06 & 6), and it made no difference. I also added a few VE units to idle region, but that only made it stink more at idle, no change in the flux.
I noticed on the latest DM generic run when the bike is above 0 speed the timing is rock solid, but as soon as the speed drops to 0, the timing starts bouncing around. If you look at the attached DM run you'll see this in the playback graph upper black line (R cyl timing).
I read somewhere when the bike speed is at 0 the closed throttle spark (CTS) takes over. If this is so why is the actual R cyl idle timing bouncing between 16.5 - 23 deg when the R cyl min timing setting is 23 deg for both CTS & main spark tables? F cyl timing is doing the same. Does anyone have any ideas how I can make this idle smoother?
The DM run, and tune are both attached. Thanks for any help
HD EFI Guru
Joined: Jan 2008
Posts: 4,496
Likes: 4,789
Hoping someone smarter than me can tell me what's up with my idle timing. 2019 RG 107 bored to 117, TTS-100 cam, TTS tune for this cam. Did a few auto tunes and it runs awesome.
However, the Idle RPM bounces approx 100 RPM either side of the desired 950 RPM. It's not EITMS kicking in, I know what EITMS feels and sounds like (I ride in FL).
It read (on this forum I believe) reducing idle spark control gain & max would smooth the idle. So I set them to 1 & 2 respectively (default is 4.06 & 6), and it made no difference. I also added a few VE units to idle region, but that only made it stink more at idle, no change in the flux.
I noticed on the latest DM generic run when the bike is above 0 speed the timing is rock solid, but as soon as the speed drops to 0, the timing starts bouncing around. If you look at the attached DM run you'll see this in the playback graph upper black line (R cyl timing).
I read somewhere when the bike speed is at 0 the closed throttle spark (CTS) takes over. If this is so why is the actual R cyl idle timing bouncing between 16.5 - 23 deg when the R cyl min timing setting is 23 deg for both CTS & main spark tables? F cyl timing is doing the same. Does anyone have any ideas how I can make this idle smoother?
The DM run, and tune are both attached. Thanks for any help
However, the Idle RPM bounces approx 100 RPM either side of the desired 950 RPM. It's not EITMS kicking in, I know what EITMS feels and sounds like (I ride in FL).
It read (on this forum I believe) reducing idle spark control gain & max would smooth the idle. So I set them to 1 & 2 respectively (default is 4.06 & 6), and it made no difference. I also added a few VE units to idle region, but that only made it stink more at idle, no change in the flux.
I noticed on the latest DM generic run when the bike is above 0 speed the timing is rock solid, but as soon as the speed drops to 0, the timing starts bouncing around. If you look at the attached DM run you'll see this in the playback graph upper black line (R cyl timing).
I read somewhere when the bike speed is at 0 the closed throttle spark (CTS) takes over. If this is so why is the actual R cyl idle timing bouncing between 16.5 - 23 deg when the R cyl min timing setting is 23 deg for both CTS & main spark tables? F cyl timing is doing the same. Does anyone have any ideas how I can make this idle smoother?
The DM run, and tune are both attached. Thanks for any help
HD EFI Guru
Joined: Jan 2008
Posts: 4,496
Likes: 4,789
There was a near exact post on Facebook. What have you set the calibration to when you are having the issue? If the bike is not moving the ECM uses Spark to try and settle the idle. Also if your model has Closed Throttle Spark settings it switchs to this set of tables every time the Twist grip is closed. So you must determine exactly where and what is happening at the time you are having the issues to determine what needs to be adjusted. You can start by setting the Idle Spark Control Gain and Idle Spark Control Max to zero. This will remove just the idle spark control but none of the other things that effect idle speed, Once you see what that does we can talk about possible adjustments from there.
Thread Starter
|
Cruiser
Joined: Jan 2010
Posts: 234
Likes: 73
From: Sunshine state
There was a near exact post on Facebook. What have you set the calibration to when you are having the issue? If the bike is not moving the ECM uses Spark to try and settle the idle. Also if your model has Closed Throttle Spark settings it switchs to this set of tables every time the Twist grip is closed. So you must determine exactly where and what is happening at the time you are having the issues to determine what needs to be adjusted. You can start by setting the Idle Spark Control Gain and Idle Spark Control Max to zero. This will remove just the idle spark control but none of the other things that effect idle speed, Once you see what that does we can talk about possible adjustments from there.
HD EFI Guru
Joined: Jan 2008
Posts: 4,496
Likes: 4,789
I zeroed out both Idle spark control gain & max. The timing at stationary idle is now very stable, and the idle RPM fluctuation is also slightly improved. The stationary idle now fluctuates approx +/- 75 RPM from the idle set rpm of 950. Before I zeroed out the idle spark control gain & max the idle was fluctuating +/- 100 RPM. Is there anything else I can adjust to smooth the idle more? Thanks for your help
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