Trans control - 0021 release

[jsmcortina]

Here's another release, a fair number of internal changes and chance for breakage. Very limited testing only, so please proceed with caution.

Changes since the last release
Apply srlbuf changes from MS2/Extra.
Re-work code to work in same units as MS2/3.
Re-work VSS code similar to MS3.
Implement down-shift curves.
Extend settings to allow for 10 gears.
Allow common line pressure curve.
Implement MS3 style software PWM.
Allow 595Hz for late 4L80E.
Add preliminary 5L40E support.
Add preliminary E4OD support. Switch pin 4 = selA, 5=selB, 6=selC. OD=selD

The zip can be downloaded from:
http://www.msextra.com/doc/trans/files/ ... 141008.zip

A current TunerStudio is required.

Successes, failures, bug reports and suggestions welcome here.

James

[Raymond_B]

This is awesome, thank you! I wish I was closer to getting my truck going, but I will try to find a way to test the E4OD stuff.

[nathaninwa]

I thankyou too James for your hard work. I'm moving along on my project and should be ready just into the new year

My dyno guy was excited to the about the downshift feature as well. I'm slowly converting him over to our side!

A dyno feature would be neat too. Something like a ground input that would either define a locked or unlocked converter and a specific gear that once wot was reached locked it there. This would help with tuning the ve table under boost and we wouldn't have to scew any up or downshift settings

[Matt Cramer]

I like the dyno mode idea. And I'd also suspect running full line pressure when the dyno mode is active would be a good idea.

[sarg]

How do you guys think the controller would react to grounding one of the solenoids in the trans to enable a gear without the controller telling it to do this via a relay. For more information, it is the "sloppy transbrake" or 3rd gear mod that Matt developed.

[nathaninwa]

Just a general question, does the code allow for a dashboard led's or display to show gear selection?

[jsmcortina]

Just a general question, does the code allow for a dashboard led's or display to show gear selection?

Not presently, although if you have a specification for what you want, that would be relatively easy to add.

The Microsquirt doesn't have enough pins to do that, so it wasn't part of the original design.

James

[jsmcortina]

How do you guys think the controller would react to grounding one of the solenoids in the trans to enable a gear without the controller telling it to do this via a relay. For more information, it is the "sloppy transbrake" or 3rd gear mod that Matt developed.

So long as it only supplies a ground that's fine. Do not apply 12V!

James

[sarg]

No it just uses a 5 pole relay to switch one of the wires the ecu or in this case the microsquirt or gpio board would normally apply ground to ground. Just curious if it would freak out the controller.

[jsmcortina]

No it just uses a 5 pole relay to switch one of the wires the ecu or in this case the microsquirt or gpio board would normally apply ground to ground. Just curious if it would freak out the controller.

At present the controller isn't "smart" enough to get freaked out. However, do be careful when first testing. I performed my initial tests with a car on stands.

James

[Matt Cramer]

No it just uses a 5 pole relay to switch one of the wires the ecu or in this case the microsquirt or gpio board would normally apply ground to ground. Just curious if it would freak out the controller.

Would it make sense to add a feature for the MicroSquirt to do this itself at the touch of a button so the MicroSquirt could give you a built in trans brake?

[sarg]

Absolutely. With a big use at your own risk disclaimer. Matt H has a couple videos of it. It is pretty insane

[sarg]

This is for the 4l80e. In theory it could work with the 60e as well, but the wiring between the two is apparently different. Matt I have this up and running currently with my factory ecu. Works very well to hold power on the line and build boost. Let off the button and it goes back to 1st and hold on!

[nathaninwa]

It's that tranny brake trick hard on the transmission at all? I'm looking at a rebuild kit and a low profile 80e brake for my setup. I'm not trying to bracket race, just make some boost on the line and make a fast pass.

James, no specific application for the prndl light up, just a neat feature i would incorporate into the dash

[sarg]

No worse than a transbrake. I talked to the guys at north Texas converter and they mentioned a modification to make (was Greek to me as I am transmission ignorant) that should be done. I am sure you could call and ask them. Great guys and will definitely get my business in the future. With that said, do not stay on the brake long or just like a transbrake your trans temps will go up very quickly.

[sarg]

So is it possible to use this trans controller as a stand alone unit? I kind of wanted to try it out before making the full swich to megasquirt as the transmission control is the only thing I really worry about. I have no doubts about the ms3 controlling the engine.

[jsmcortina]

So is it possible to use this trans controller as a stand alone unit? I kind of wanted to try it out before making the full swich to megasquirt as the transmission control is the only thing I really worry about. I have no doubts about the ms3 controlling the engine.

Yes you can. It does require a little more wiring as you need to feed it engine speed and TPS (or MAP.) when integrated with the Megasquirt it fetches these automatically over the 2-wire CAN hookup.

James

[sarg]

From a functionality stand point is there any advantages to the microsquirt over the gpio board for transmission control?

[ap67et10]

I just loaded the new code into GPIO for my 4r75w. I'm running an analog gear position switch from and earlier 4r70w. I never got a chance to load the first version of the code, so this is the first time I have tested it. I can't get any gear selector position to show when moving through the gears. It doesn't seem to do anything, but I'm not exactly sure why. It worked fine with the megashift code. My thought was that the input pin was wrong? So I went from the AD0 port I was using for gear position to AD1 and AD3 but none of them made any difference. So at the moment I can't get the correct gear position, or really any position change on the tuner studio gear position gauge. Also it seems like the trans temp calibration is off for ford also.


Andrew

[jsmcortina]

Please post the MSQ you are using and I'll try it out next week.

I do expect there to be rough edges (i.e. things not working) at the moment. Did you calibrate your temp sensor?

James