Closed Loop Idle - Increase Recovery Speed

[ErnieJones]

I've got a quick question on closed loop idle. I've got it roughed in quite well on my motorbike but there's one issue that I'm not sure how to address or what setting needs to be changed.

When I come up to a stop and pull the clutch in the idle is too low. After a few seconds the IAC pulls the idle back up to the correct level. So it's working well but I'd like to see that delay decreased so that the IAC responds faster and I'm not sure what setting does that. My settings so far look like this;

closedloop.jpg

What setting should I be looking at to reduce that time?

[grom_e30]

pid delay. all conditions have to be met for 3 seconds before it even starts to make any adjustments.

[ErnieJones]

pid delay. all conditions have to be met for 3 seconds before it even starts to make any adjustments.

Thanks Grom - that seems to have made a difference

[nathaninwa]

I also like to use a collant based initial value over the last value. I'm able to catch idle about 100rpm above my target than pid kicks in

[ErnieJones]

I also like to use a collant based initial value over the last value. I'm able to catch idle about 100rpm above my target than pid kicks in

I was thinking along the same lines. I'm seeing that there are different 'levels' to fine tuning and it's pretty neat. I'm getting closer all the time and I think coolant based values should be easy since I have them from doing the open loop warmup

[grom_e30]

yeah i second the clt based initial duty table been using it with ms3 works well once tuned, the other great thing ms3 has is you can have the closed loop idle engage by vss, so below say 10mph it goes in to cl idle.

[muythaibxr]

I also like to use a collant based initial value over the last value. I'm able to catch idle about 100rpm above my target than pid kicks in

I was thinking along the same lines. I'm seeing that there are different 'levels' to fine tuning and it's pretty neat. I'm getting closer all the time and I think coolant based values should be easy since I have them from doing the open loop warmup

Don't use coolant based! Coolant temp is factored in roughly by changing the target RPM. Use MAT based. On most cars this has a greater effect on the actual idle speed once target RPM based on CLT is factored in.

[ErnieJones]

Don't use coolant based! Coolant temp is factored in roughly by changing the target RPM. Use MAT based. On most cars this has a greater effect on the actual idle speed once target RPM based on CLT is factored in.

I take it by MAT you also mean IAT and by car you also mean motorcycle? If so, I'm game to try it

[nathaninwa]

I found, maybe in my particular application, iat was tough to tune. Meaning it could be 30-40 degrees outside and the and after a boost pull temps were way higher than ambiaent and trying to get the motor to idle in each situation was tough. Now that I have a better intercooler boost iat's are not as high, but my overall tune is better

Maybe I'll tinker with iat based setup again, but so far idle is solid with it based on collant temp

[muythaibxr]

Most people have issues with CLT based when heat soak starts happening.

[muythaibxr]

Don't use coolant based! Coolant temp is factored in roughly by changing the target RPM. Use MAT based. On most cars this has a greater effect on the actual idle speed once target RPM based on CLT is factored in.

I take it by MAT you also mean IAT and by car you also mean motorcycle? If so, I'm game to try it

Yes and yes.

[MWPau]

I could never get "Initial/Last Value: Last Value" to be reliable no matter how high i made the DashPot Adder.
I always got an occasional stall when pulling up to stop lights.

Im now using these settings which work great:
Initial/Last Value: Initial Value Table
Dashpot Adder: 0%
Close Delay: 0
PID Delay: 2sec