Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engines

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Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engines

Postby 5.3LS10 » Sun Sep 14, 2014 1:16 pm

Hey everyone,

Awhile back I was in need to test a wasted spark mod I made to a MS2V3 for LS engines utilizing a 24x crank signal. The jimstim v2.0.3 firmware has an incorrect pattern that does not work correct. I worked with Jean to get a copy of the new wheel pattern and upgraded it to the jimstim. Was able to test everything perfectly ahead of time. Since there is not a lot of documentation on the whole procedure to upgrade the wheel pattern I am providing a write up for those that are also interested in doing so.

First download the new wheel pattern and the wheel_Converter.exe file.
The executable can be downloaded from here:
http://jbperf.com/JimStim/JimStim_v2_0_ ... el_upgrade
And here is the updated wheel pattern
wheels_default_ls1.zip
(4.4 KiB) Downloaded 162 times


Unzip files (wheels_default_ls1.jsw from the .zip file) to the same directory as the wheel_converter.exe downloaded from link above.

Once this is done insert your USB serial adapter. This is the one that I have used with good luck http://www.amazon.com/gp/product/B004LC28G2

Go into device Manager and find out what COM port it is being assigned to.

Now open command prompt and use CD to browse to the directory that the wheel_converter.exe is in. Mine was in C:\Users\shanec\Downloads\Megasquirt\

you can use dir to list the directory contents and verify you are in the correct spot.

Once you have browsed to the correct directory that the files reside we need to get the jimstim ready to take the upgrade.

With the power off (I unhook it from the megasquirt as well) change the DIP switch position 3-6 to ON and all others off. Also need to arrange the 2x3 pins just below the CPU like this:

IMG_20140911_212609_480.jpg
IMG_20140911_212609_480.jpg (1.32 MiB) Viewed 5794 times


Also make sure when you hook up the USB cable that the black wire goes towards GND on the board.

Now power on the jimstim and enter the following command:

wheel_converter.exe wheels_default_ls1.jsr wheels_defaults_ls1.jsw COMX 9600

The "X" in COMX needs to be replaced with the COM # you found under device manager.

Once finished you will see a result like that below

wheel pattern upgrade.png
wheel pattern upgrade.png (92.61 KiB) Viewed 5794 times


If you have any issues or questions feel free to ask. Hope I helped.

Thanks,
Shane
5.3LS10
 
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby jbelanger » Sun Sep 14, 2014 1:34 pm

Thank you for the write up! I'll keep it as a sticky here.

I'd like to add that when upgrading the wheel pattern, you should always look at the last 3 lines you get from the command. These let you know if the upgrade was successfully completed. The third line from the bottom gives you the memory address at the end of the wheel patterns. This needs to be less than f200; if not, you have overfilled the memory allocated to the wheel patterns and you will have issues. So you need to immediately upload the standard wheel pattern file before doing anything else. You will then need to remove some patterns from your file so that it fits in the available memory.

The last 2 lines need to have a '1' at the end. This confirms that the content of the JimStim CPU memory has correctly been verified and that what you have in the CPU is actually what you uploaded. This is to make sure there was no corruption due to a bad serial link. If you do not get the correct result (checksum being the same as the one received with a '1' at the end), then you will need to correct the serial link issue and start again. The CPU memory allocated to the wheel patterns might be corrupted so you cannot trust the RPM output to be correct.

Jean
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby Manu » Thu Jul 30, 2015 1:52 pm

Hello Jean,

I've tried to use a custom pattern with my jimstim but I having some troubles :

1 - does the dos.exe replace the whole patterns in the jimstim or is it a temporary mod and when we unplug the power the jimstim return to base config ?
2 - I get a COM error when I try to use wheel_converter.exe wheels_default.jsw wheels_defaults.jsr COM4 9600. I'm using Win7-32bit and a brand new FTDI TTL-232R-3V3. Widows create a COM4 when I plugged the cable.

Any ideas about the error ?

Best.
Manu
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby jbelanger » Thu Jul 30, 2015 2:06 pm

Manu,

When you run wheel_converter.exe successfully, this replaces the wheel pattern in flash memory so this is permanent.

As for the error, do you have the jumpers set correctly as well as the correct DIP switches? Also, you need to power cycle after changing the DIP switches. You can also test this with a terminal app (or the mini terminal in TunerStudio); if you type 'S' or 'Q', you should get the firmware signature and version.

Jean
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby Manu » Thu Jul 30, 2015 2:34 pm

Hello Jean,

Thank for your support. COM error goes after a PC reboot ;-)

I was mainly sure about flah memory. I will play with all of that this night. I've done a mod for MS2extra that ad a new pattern (505 V6 60-2-2-2) to the firmware. This firmware work well with the engine. But I now need to test timings (mainly inj timing) on a desk and here come the jimstim ;-)

Bests,
Manu
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby Manu » Tue Jan 05, 2016 9:30 am

Jean,

Voici un fichier wheels_default.jsw qui modifie la roue phonique Renix 44-2-2-2 en lui ajoutant le capteur de phase pour les gens qui veulent faire les essais dans cette configuration.
Attention, ce mode ne permet pas de valider les installations 66-2-2-2 avec capteur de phase, mais permet toujours de valider le 66-2-2-2 sans capteur de phase.

++
Manu
Attachments
wheels_default.zip
Default + Renix séquentiel
(4.24 KiB) Downloaded 104 times
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby highlander » Mon Aug 15, 2016 11:44 am

When we select the 24x signal, does it output 12v back to the channel or is there something that needs to be changed?
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby jbelanger » Mon Aug 15, 2016 11:53 am

You need to use the 12V pull up jumper to have a 12V signal: http://jbperf.com/JimStim/JimStim_v2_0_ ... .html#tach.

Jean
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby highlander » Tue Nov 01, 2016 5:43 pm

Is there a way to change the rising vs falling?
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby jbelanger » Tue Nov 01, 2016 5:48 pm

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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby highlander » Tue Nov 01, 2016 6:59 pm

Thanks,

I tried this today without any luck.

On the MS3Pro i had to invert the signal to get it to work. But i just can't make the signal work for a stock ECU.
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby jbelanger » Tue Nov 01, 2016 7:16 pm

Another way to do this is to change the pattern in wheels file. For that you would need to invert the second digit on all the lines in the LS1 pattern. That means that when you see a line that starts with '01,' you need to change that to '00,' and when you see '00,' you change that to '01,' then '10,' becomes '11,' and '11,' becomes '10,'

That will change the polarity of the crank signal only. If you need to change the polarity of the cam signal, you then need to invert the first digit.

Jean
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby highlander » Tue Nov 01, 2016 8:08 pm

Only the second digit???

00,10, ==> 01,10
01,10,//1 ==> 00,10

Like that?
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby jbelanger » Tue Nov 01, 2016 8:25 pm

The LS1 pattern in the file in the first post starts with:

Code: Select all
//wheel9
//LS1 full wheel pattern. Taken from LM7 engine
10,2,//46
00,10,//cam falling
01,3,//47
00,3,
01,12,//0
00,3,

That would then become

Code: Select all
//wheel9
//LS1 full wheel pattern. Taken from LM7 engine
11,2,//46
01,10,//cam falling
00,3,//47
01,3,
00,12,//0
01,3,

and so forth for the rest of the pattern.

I think that's what you meant but I wasn't sure.

Jean
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby highlander » Tue Nov 01, 2016 8:58 pm

Thanks for this... could you decode what the numbers actually are?

I might update... i have FW v 2.04... i wonder if i don't have the right data.

although the decode worked for the ms3 when i set it to falling, which is the normal way of decoding. So the jimstim is right. I just have never been able to make it work with a stock ECU. I can make work the 58x but not the 24x no matter what i do.
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby jbelanger » Tue Nov 01, 2016 9:17 pm

There's some information about the file format here: viewtopic.php?f=5&t=1521#p8144

It is possible that there is something not quite there with the JimStim 24x that the MS3 ignores but the stock ECU requires. To be absolutely certain that the pattern is correct for the stock ECU, you would need to use an oscilloscope after whatever circuit is used to condition the signal and then generate a pattern for the JimStim that exactly reproduces it.

It shouldn't be this complicated but that depends on the circuit used and the decoding done by the ECU. Both of these can have very specific peculiarities that make this specific combination more problematic.

Jean
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby highlander » Wed Nov 02, 2016 8:13 am

Looks like i am going to have to get a reluctor and an actual sensor and test it.
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby highlander » Fri Nov 04, 2016 11:15 am

This wheel file worked much better.... it does have some sync issues but sometimes the computer just picks it up and provides better wheel sync... i may test the other computer soon and see how it works....

Thanks
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby rickb794 » Sat Apr 29, 2017 8:44 pm

This info seems to be 6 mos old have the LS1 changes been rolled into the latest wheel pattern file?

So I am currently at 2.0.3, I don't see 2.0.4, the difference must be the wheel pattern?

To get the LS1 deal working do I load

wheels_default.jsw

or

wheels_default_ls1
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Re: Upgrading Wheel Pattern on JimStim V1.5 for LS 24x engin

Postby rickb794 » Sat Apr 29, 2017 10:28 pm

Updated wheel pattern

The update has been rolled into the current wheels_default.jsw

NOTE:

Save the three files

http://jbperf.com/JimStim/wheel_converter.exe

http://jbperf.com/JimStim/wheels_default.jsw

Save & Re-name http://jbperf.com/JimStim/wheel_converter.c to wheel_converter.jsr

wheel_converter.exe on XP did not like com27, had to reassign FTDI to com2

Command used - wheel_converter.exe wheels_default.jsw wheel_converter.jsr com2 9600

After that it ran fine finishing with 1,1
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