Retard timing before shift

'Microsquirt' Transmission Control development and support.

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white probe
MS/Extra Newbie
Posts: 10
Joined: Sat Apr 25, 2015 7:52 pm

Retard timing before shift

Post by white probe »

Hi Guys I have a ms3 pro for my engine and micro for the transmission, I am in the early stages of tuning the engine, the problem I have is with the trans shifting hard, I have 15 degrees of retard timing when shifting I would want more but I dont know if it can accomplish, I data log the transmission and the micron send the shift and retard signal at the same time, it would be possible to control the timing so it retards a fraction of a second before shift and do you guys know if timing can retard more than 15 degrees, I attach engine and transmission file, thanks for your help.
Matt Cramer
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Joined: Thu Apr 16, 2009 8:08 pm

Re: Retard timing before shift

Post by Matt Cramer »

Maybe this one needs a bit less line pressure. Higher line pressure makes for harsher shifts.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
jsmcortina
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Re: Retard timing before shift

Post by jsmcortina »

The maximum retard is set at 15 degrees in the ini file, which can be edited. However, as Matt says, perhaps you are running too much line pressure.

The timing of solenoids and retard etc. is more flexible in the beta firmware I'm currently working on, which may help you get better shift behaviour.

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
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white probe
MS/Extra Newbie
Posts: 10
Joined: Sat Apr 25, 2015 7:52 pm

Re: Retard timing before shift

Post by white probe »

Thanks Matt and James for your answers, I adjust line pressure and is more much smooth, also datalog the engine on wot and notice on megalog the timing retard about .25 of a second before shift, this auto tune is very good, still adjusting the fuel tables but everything is looking great, thanks for you help.
jsmcortina
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Re: Retard timing before shift

Post by jsmcortina »

The next beta version of the transmission control code has more fine-tuning available for shift timings.

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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