Bouncy AFR at low throttle - why
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 |
Zip your log and post it. I'd bet your AEs are kicking in.
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1 Attachment(s)
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 |
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How does sparkadvance go negative?
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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 |
Originally Posted by paul
(Post 321997)
How does sparkadvance go negative?
Originally Posted by Zaphod
(Post 322005)
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 |
Please keep in mind it's a MS2 not a MS1.
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Originally Posted by Zaphod
(Post 321976)
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?
there are supposed to match. I suggest you start posting the the MS-II forums at msextra.com |
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 |
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