MS3 pre-1.3.3 beta 5 released (urgent for Nissan CAS)

Testing and development of Megasquirt 3

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jsmcortina
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MS3 pre-1.3.3 beta 5 released (urgent for Nissan CAS)

Post by jsmcortina »

To announce MS3 pre-1.3.3 beta 5.

This code is in the 1.3.x stream and follows pre-1.3.3 beta 4.

ALL NISSAN CAS USERS ARE URGED TO UPGRADE.

The only changes since pre-1.3.3 beta 4 is a bug fix:
Re-ordered injector event array update code to resolve SR20 (and other) injector issue.

The specific issue here is likely to impact other wheels where you are running sequential fuel and the number of teeth per 720 degrees is equal to the number of cylinders. e.g. Nissan SR20, Nissan RB25, Optispark.
I do not believe there is any impact on other wheel modes that use a decent number of teeth (36-1 etc) or on wheels where both edges of the teeth are used (e.g. 4G63)
EDIT: The symptoms of this problem was that at certain injection angles/loads/RPMs (when the start of an injection pulse aligned with a tooth edge) there was a miscalculation that could cause an injection pulse to be missed. This would be observed as a misfire.

The zip file can be downloaded from:
http://www.msextra.com/doc/ms3/files/be ... 3beta5.zip

Be sure to read the README.txt and RELEASE-NOTES.txt that are supplied in the zipfile.
Some of the ini changes will result in harmless warnings when loading MSQs from 1.3.x
Users upgrading from 1.2.x or earlier codes need to pay more attention.
TunerStudio 2.6.x is REQUIRED.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
Kzcleve
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Re: MS3 pre-1.3.3 beta 5 released (urgent for Nissan CAS)

Post by Kzcleve »

Thanks for this update. I am running the Optispark wheel and I had been beating my head against the wall trying to work out a misfire issue. I was getting random RPM drops and I was also consistently seeing a misfire in the mid 2000 RPM range. I was working under the assumption that they were the same or a related problem because both the RPM drop and the misfire felt the same. However, with this update the consistent misfire in the mid 2000 RPM range is completely gone and the random RPM drops have been slightly reduced but they are still happening. The car is performing substantially better than it was but now I am wondering if the RPM dips might be a related issue in the code. Or it might just be coincidental that they are happening less frequently after the firmware update. Here is a link to my thread on the RPM dip and misfire issue http://www.msextra.com/forums/viewtopic ... 31&t=50826. Either way, I am really happy having the consistent misfire gone, great fix.
jsmcortina
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Posts: 39585
Joined: Mon May 03, 2004 1:34 am
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Re: MS3 pre-1.3.3 beta 5 released (urgent for Nissan CAS)

Post by jsmcortina »

Now superceded by 1.3.3

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
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