Bouncy AFR at low throttle - why
#1
Elite Member
Thread Starter
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,558
Total Cats: 105
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Hi guys,
as I am in the process of dialing in my VE tables, I made a lot of logs.
The VEs seem to get dialed in quite good - what confuses me is the bounces in the AFR when I have throttle very low (like next to 2-5) or when I let go of the throttle:
pic
![](http://www.ingenieure-reichel.de/upload/MS/logbild.jpg)
You can see the spikes, where AFR goes from very low to very high. If I get in the cruise or boost area, the AFRs are very steady and nearly perfect.
One more question - what is Spark advance in MLV showing me - it doesn't fit my spark table at all. In the pic it sits at 4 and the advance table says 24.5? Or did I choose the wrong value - what other value shows me real spark timing then?
Thanks
as I am in the process of dialing in my VE tables, I made a lot of logs.
The VEs seem to get dialed in quite good - what confuses me is the bounces in the AFR when I have throttle very low (like next to 2-5) or when I let go of the throttle:
pic
![](http://www.ingenieure-reichel.de/upload/MS/logbild.jpg)
You can see the spikes, where AFR goes from very low to very high. If I get in the cruise or boost area, the AFRs are very steady and nearly perfect.
One more question - what is Spark advance in MLV showing me - it doesn't fit my spark table at all. In the pic it sits at 4 and the advance table says 24.5? Or did I choose the wrong value - what other value shows me real spark timing then?
Thanks
#3
Elite Member
Thread Starter
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,558
Total Cats: 105
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
O.K. though this is not a very special log, I attach it.
It can very well be, that it is the AE kickin in...
https://www.miataturbo.net/forum/att...1&d=1224578175
Any ideas to the spark question?
Thanks
It can very well be, that it is the AE kickin in...
https://www.miataturbo.net/forum/att...1&d=1224578175
Any ideas to the spark question?
Thanks
#6
Elite Member
Thread Starter
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,558
Total Cats: 105
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
That is what I am not sure about.
I just add this information - my trigger angle/offset is at -7.00 degrees.
(That was how I did reach 10° BTDC with the trigger wizard.)
Maybe it has something to do with this?
Greets
I just add this information - my trigger angle/offset is at -7.00 degrees.
(That was how I did reach 10° BTDC with the trigger wizard.)
Maybe it has something to do with this?
Greets
#10
Elite Member
Thread Starter
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,558
Total Cats: 105
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
O.K. and the point goes to... Matt at DIYautotune!
He emailed me:
<You probably have some other table active that is modifying your
<ignition advance.
Well, I hadn't seen, that my Knock sensing was turned on (because this is hidden in a little sub-menu) which I haven't got at this point and I suppose the MS was thinking, that my car is knocking a lot...
Switched it out and get sensible readings with Megatune.
Now to the original topic - someone?
Greets
He emailed me:
<You probably have some other table active that is modifying your
<ignition advance.
Well, I hadn't seen, that my Knock sensing was turned on (because this is hidden in a little sub-menu) which I haven't got at this point and I suppose the MS was thinking, that my car is knocking a lot...
Switched it out and get sensible readings with Megatune.
Now to the original topic - someone?
Greets
Thread
Thread Starter
Forum
Replies
Last Post
JesseTheNoob
DIY Turbo Discussion
15
09-30-2015 02:44 PM