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Andy's 1996 GM 3.1L V6 in a 1932 Ford Coupe (11th) 
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LQFP144 - On Top Of The Game
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Location: Gosport, IN USA
VE Map from MS2 (best tune for performance with bank injection)

Ignition Map based on GM original ignition tables.

EDIT: the spark advance table is incorrect see the .txt file in the next post for the correct timing information... 03/27/2012


Attachments:
MS2_VE_Table.PNG
MS2_VE_Table.PNG [ 55.04 KiB | Viewed 2841 times ]
MS2_IgnitionTable.PNG
MS2_IgnitionTable.PNG [ 46.68 KiB | Viewed 2841 times ]

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Andy.
FreeEMS vehicle #11, 1932 Ford 5 Window Coupe with a 1996 GM 3.1L SFI V6 with DIS ignition
FreeEMS vehicle #16, 1996 Chevrolet S10 2.2L SFI I4 with DIS ignition
http://www.coolefi.com


Last edited by DeuceEFI on Wed Mar 28, 2012 2:50 am, edited 1 time in total.

Mon Mar 19, 2012 10:38 pm
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LQFP144 - On Top Of The Game
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Location: Gosport, IN USA
Here is a text file with the original GM ECU tables.


Attachments:
[The extension txt has been deactivated and can no longer be displayed.]

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Andy.
FreeEMS vehicle #11, 1932 Ford 5 Window Coupe with a 1996 GM 3.1L SFI V6 with DIS ignition
FreeEMS vehicle #16, 1996 Chevrolet S10 2.2L SFI I4 with DIS ignition
http://www.coolefi.com
Mon Mar 19, 2012 11:02 pm
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LQFP144 - On Top Of The Game
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Location: Gosport, IN USA
Here is the waveform after inverting the EST signal coming out of the XOR.

Green trace is Reference Pulse into FreeEMS, Blue trace is EST from FreeEMS.


Attachments:
File comment: After inverting the XOR output for EST (blue trace)
Idle.png
Idle.png [ 20.71 KiB | Viewed 2825 times ]

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Andy.
FreeEMS vehicle #11, 1932 Ford 5 Window Coupe with a 1996 GM 3.1L SFI V6 with DIS ignition
FreeEMS vehicle #16, 1996 Chevrolet S10 2.2L SFI I4 with DIS ignition
http://www.coolefi.com
Tue Mar 20, 2012 12:26 pm
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LQFP144 - On Top Of The Game
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Photos from my testing today...

Here is the first round of testing with changing only the dwell.
After the dwell was increased to 15000 the engine became harder to start and rocked violently.

I also included the baseline factory TACH versus EST waveforms...

Notice the 1500Dwell_0Offset.png the EST signal is inverted...


Attachments:
File comment: GM Factory DIS EST signal at idle (blue trace)
DIS-at-idle-GM-PCM.png
DIS-at-idle-GM-PCM.png [ 24.73 KiB | Viewed 2791 times ]
15000Dwell_0Offset.png
15000Dwell_0Offset.png [ 20.52 KiB | Viewed 2791 times ]
1500Dwell_0Offset.png
1500Dwell_0Offset.png [ 20.24 KiB | Viewed 2791 times ]

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Andy.
FreeEMS vehicle #11, 1932 Ford 5 Window Coupe with a 1996 GM 3.1L SFI V6 with DIS ignition
FreeEMS vehicle #16, 1996 Chevrolet S10 2.2L SFI I4 with DIS ignition
http://www.coolefi.com
Sat Mar 24, 2012 11:54 pm
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LQFP144 - On Top Of The Game
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Joined: Thu Feb 25, 2010 3:57 am
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Location: Gosport, IN USA
After inverting the EST signal, here is what I have come up with...

For these only the dwell has been changed.

Timing light shows 14* advance versus MTX 10* advance.


Attachments:
15000Dwell_0Offset_inverted.png
15000Dwell_0Offset_inverted.png [ 20.33 KiB | Viewed 2791 times ]
7000Dwell_0Offset_inverted.png
7000Dwell_0Offset_inverted.png [ 20.28 KiB | Viewed 2791 times ]
1500Dwell_0Offset_inverted.png
1500Dwell_0Offset_inverted.png [ 20.32 KiB | Viewed 2791 times ]

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Andy.
FreeEMS vehicle #11, 1932 Ford 5 Window Coupe with a 1996 GM 3.1L SFI V6 with DIS ignition
FreeEMS vehicle #16, 1996 Chevrolet S10 2.2L SFI I4 with DIS ignition
http://www.coolefi.com
Sun Mar 25, 2012 12:00 am
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I believe its been fixed, but before anyone tries to copy it, lets place on record that that spark table is about as wrong as its possible to be.


Tue Mar 27, 2012 12:26 pm
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LQFP144 - On Top Of The Game
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Location: Gosport, IN USA
This post contains a Saleae trace of the original GM Reference Pulse and EST signal for idle plus a couple of revs from my other car that still has the factory ECU.


Attachments:
GM_Factory_ReferencePulse_vs_EST.logicdata.zip [129.36 KiB]
Downloaded 123 times

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Andy.
FreeEMS vehicle #11, 1932 Ford 5 Window Coupe with a 1996 GM 3.1L SFI V6 with DIS ignition
FreeEMS vehicle #16, 1996 Chevrolet S10 2.2L SFI I4 with DIS ignition
http://www.coolefi.com
Wed Mar 28, 2012 2:55 am
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Good info! Take a look at the EST pulses between 18.02002542 and 18.07987475.

With respect to timing:

  • The ignition right on 30ms is 1.48ms before the rising edge of the reference pulse.
  • The ignition just before 50ms is 1.72ms before the rising edge of the reference pulse.
  • The ignition right on 60ms is 1.85ms before the rising edge of the reference pulse.
  • The ignition just before 80ms is 1.96ms before the rising edge of the reference pulse.

All of these are at about 1300 RPM with 45ms per revolution which means that the four pulses were 12, 13.8, 14.8, and 16 degrees BTDC, respectively. And all of that over 4 reference pulses and 480 degrees of engine movement. The dwell was also wild with 5.18, 5.58, 5.49, and then suddenly 6.92 followed by another 6.92 and then a 6.48. Not very consistent with the leading edge of the dwell falling fairly randomly and not mattering much. Three sample points:

  • Dwell at idle of 895 rpm is about 6ms with 4.5 degrees BTDC timing which is 25% duty.
  • And 5ms with 70% duty and 12.8 degrees BTDC timing at 2142 rpm
  • And 4.6 with 70% duty and 25 degrees BTDC timing at 3000 RPM

I'll try to configure you something on based on the latest stuff later today, after i get the config clean up stuff out of the way, and get it looking right on my bench rig. Then if you have the XOR setup correctly, you'll get good results. I hope.

Fred.

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Wed Mar 28, 2012 11:16 am
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Pushed on new branch "ForAndyToTryAndTweak" which I'll amend based on your detailed and thorough report :-)

From IRC, for the record:

(15:56:24) DeuceEFI: to be clear you want RPM, CAM inputs along with Ignition Advance outputs from both the OEM and FreeEMS from idle to 5k in nice steps, right?
(15:57:16) Fred: sounds idyllic, yes :-)

A before (my attempt) and after, with your tuned results, would be good :-)

Things to tweak: Dwell and timing, both can be live edited in EMStudio, but NOT MTX.

(16:00:18) Fred: you've also got the decoder offset that you can adjust if it's wildly out, and polarity of output and input, the latter of which is the same as the decoder offset, just more coarsely

Don't forget to hit save on your table changes, whatever they are, and get me those details. Somehow.

Fred.

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DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Wed Jul 18, 2012 4:13 pm
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LQFP144 - On Top Of The Game
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AncientGeek wrote:
I believe its been fixed, but before anyone tries to copy it, lets place on record that that spark table is about as wrong as its possible to be.
:lol2:

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Wed Jul 18, 2012 10:50 pm
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