MS3 1.5 Engine States Alpha-N
I'm running MS Labs Basic MS3 with Firmware 1.5 and Alpha-N control algorithm because ITBs. My MS3 only has one MAP sensor. Because I'm running Alpha-N I decided to use that for real time barometric correction since I like to drive in the mountains a lot and want to be able to handle elevation changes from sea level to 5390ft without fuss. However, with the update to Firmware 1.5 and the addition of Engine States feature I noticed that the MS3 thinks I'm in the Overrun condition when I'm actually at idle. Because I don't have a MAP sensor hooked up to my vacuum manifold, I have no way to adjust the Overrun MAP threshold parameter on the Engine States Settings dialog.
Consequently, I've had to temporarily disable the overrun fuel-cut feature so that my car will run at all. Is this something that I can tune around by adjusting the fast/slow accel/decel thresholds? Or is it hopeless since I don't have a MAP sensor and I'm not using VSS, either? How important/beneficial is the overrun fuel-cut feature anyway besides improved mpgs? Pics for clicks https://www.flickr.com/photos/addlightness/31725879136/ |
I can upload my msq and msl later but before when I was running 1.4.0 this wasn't an issue. It seems that something changed between 1.4.0 and 1.5 in how the ECU was determining overrun condition because immediately after updating the firmware to 1.5 this became an issue for me and I had to disable overrun fuel-cut.
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I'm completely unwilling to even try 1.5 due to the engine states "feature". It is a "feature" that was never requested by any user, it was just shoved down our throats, because MAYBE it makes the code easier to maintain and support. I advise everyone to not update to 1.5 unless you have an extremely urgent feature that you need or a very serious bug fixed.
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Originally Posted by Reverant
(Post 1395611)
I'm completely unwilling to even try 1.5 due to the engine states "feature". It is a "feature" that was never requested by any user, it was just shoved down our throats, because MAYBE it makes the code easier to maintain and support. I advise everyone to not update to 1.5 unless you have an extremely urgent feature that you need or a very serious bug fixed.
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The developers don't much elaborate on the bugs and other minor fixes in the readme. Since I'm at the very beginning of tuning my car I figured there's no time like the present to upgrade to the latest and greatest because bug fixes.....
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So the recommendation is to backdate to 1.4.1 and definitely enable overrun fuel-cut?
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It didn't break ShadowDash and MSDroid for me. Seems fine. I like the engine states.
OP post over on MSExtra instead of here. They will have more information for you. Megasquirt Support Forum (MSEXTRA) ? MS3 Development (View forum) |
Set the map sensor to the TPS signal so it fakes a map signal and triggers overrun at low throttle?
This pushes the problem to confusing overrun and idle, but that seems to be a problem that the devs are paying more attention to at the moment. |
Why run alpha-n at all? My car has been running fine in ITB mode for close to three years now on a DIYPNP and now MS3.
Install another MAP sensor to act as BARO also. I live in an area that has like 20' elevations at best but still decided to do a baro sensor so I dunno what would keep you from doing it since the ecu you have is more than capable. And of course you can run without DFCO but why would you want to? |
Originally Posted by aidandj
(Post 1395628)
It didn't break ShadowDash and MSDroid for me. Seems fine. I like the engine states.
OP post over on MSExtra instead of here. They will have more information for you. Megasquirt Support Forum (MSEXTRA) ? MS3 Development (View forum) |
Originally Posted by hector
(Post 1395763)
Why run alpha-n at all?
Originally Posted by hector
(Post 1395763)
Install another MAP sensor to act as BARO also.
Originally Posted by hector
(Post 1395763)
And of course you can run without DFCO but why would you want to?
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