TunerPro User Forum

Mykk

I see the GUFB.xdf, I also found A3M.bin's online. I've also added 8k of blank data in front of the 56k A3m bin to make it a 64kb file and align the table addresses to match the GUFB.xdf, do I need to remove the 8k of blank data on a modified .bin before loading the .bin to the quarterhorse to run o...

Mykk

Welcoming all tuning and theory links regarding A3M ecu. Quarterhorse in a Foxbody 1993 Mustang 5.0 manual trans. Thank you!

Mykk

Hey guys, is there an online tutorial or guide for navigating the GM TPI ecm's, .xdf and .bins? I am familiar with OBD1 BMW Motronic chip tuning. I'm familiar with carb & dist tuning small block chevies as well as modifying OBDII GM by way of HPtuners. But this is my first OBD1 GM. https://previ...

Mykk

Look a few threads down "M3.3.1 motronic 413 & 506 xdf update" all the information is in there.

Mykk

Ohh, it's M3.1... unfortunately I dont know axis descriptors for M3.1

Mykk

1C is vehicle speed. D6 is raw load, D5 is dampened load.

What Calc do you use to convert temperature header into actual degree?

Mykk

Have you change the 'Table of tables' addressing, perhaps WOT address has been changed to part throttle address? If the cell hit tracing seems to disappear from all of the fuel tables, idle, PT & WOT despite WOT protocol perhaps there is a problem with an input sensor or the DME has recognized s...

Mykk

The idle/pt & pt/WOT threshold tables came from Olafu in this thread. I believe he had knock tables in the same xdf

Mykk

Everything worked out great until the system went into WOT values. At WOT the DME still used ignition values from part throttle map as planned, however the fueling stopped cell hit tracing from PT fuel table during WOT protocol and with the throttle open the engine did indeed act like a fuel cut and...

Mykk

I'm experimenting this morning; keeping the Idle to PT & PT to WOT threshold values but changing the Idle, PT, WOT Ignition and Fueling tables to all reflect the PT table in the Table of Tables to see if I can get the car to run on just PT tables all of the time. In theory this will still allow ...

Mykk

I'm currently going through all of my collected .bin's for my vehicle and making usable xdf's for each and I wanted to truly thank you guys for the time and work you've put into disassembling and reverse engineering the M3.3. I've got a race event this weekend in Tucson Az, mostly just a test & ...

Mykk

On my 404DME M3.3 I have replaced the TPS with a MAP sensor. I've tried to run my car solely in P/T tables, much like how a standalone EFI you only get one VE & one Timing map for entire operation (not including temp modifiers). The Motronic doesn't like to idle in the P/T maps. I would need to ...

Mykk

Any new goodies for us M3.x guys?

Mykk

I've got the same byte in my 404dme V8, it is set to 08H just like the 413. I decided to see how it would respond changing that byte to 18H despite not having vanos.

The vehicle didn't respond any differently and still pulled ignition from appropriate tables.

Mykk

Ohh! Very cool

Mykk

When you say D00C - BIT4 do you mean @ address D00F there is a byte with 00?

In the 413.bin I'm looking at D00C is value 08, but at D00F there's a 00.....on the 4th byte away counting D00C as the first.

Mykk

It's been brought to my attention that the M3.x.x can indeed live data from diag port. You need an old Windows xp computer with an rs232 serial port. And you need the Tiny ADS interface. Using the software DIS v39. http://preview.ibb.co/cf0e4w/dis02.jpg http://preview.ibb.co/cgXFcG/dis05.jpg http://...

Mykk

I should update this thread with most current xdf for the 404:

https://drive.google.com/file/d/1WZMXGT ... sp=sharing

Mykk

I just came here to say the same, tested it on mine this eve. It still seems to go lean but not completely into fuel cut. The exhaust has a cool sounding burble on decel now and throttle response seems a bit better. I set mine to all 254. I think the other tables in play are still acting as a cut as...

Mykk

Here is a Motronic M3.1 tuning guide using the 402 as examples, including map addresses and identification.

https://drive.google.com/file/d/1rqQ7aY ... sp=sharing

Mykk

I've isolated the table in my 404 as well, it's directly followed by a mysterious D2 axis identifier. This could shed some light on that axis identifier.

I won't be able to road test this table on my vehicle for a little while as mine isn't running at the moment.

Mykk

Really bummed seeing this thread slow down after so many amazing discoveries. Any further developments to aid in removing some of the mystery of the Motronic?

Mykk

I do agree I can watch mine switch out of fuel cut around 1500rpm and there very well might be a single byte or two that controls that RPM point. If so I would imagine it's in the front of the code where the Rev limit, Speed limit, Injector Constant...etc. are located. I have a feeling Olafu would b...

Mykk

I'm throwing this out there as an idea to investigate, I don't know for certain. But...perhaps the answer to your engine overrun/decel/fuel cut is in those TPS threshold tables. We already know about the Idle to Part Throttle threshold and the Part Throttle to WOT threshold, but their appear to be s...

Mykk

When I deleted the IAC my idle control tables were no longer being used by the DME. Instead I wired two LED's on the IAC wiring, shared +12v and the two controlled grounds from DME. It successfully tricked DME into thinking IAC was present and it started pulling data from idle tables again. I'll exp...

Mykk

Thank you very much. I'm prepping my car for a race event in Tucson Az in a month, I'm mounting an MSD DIS-4 and two waste spark ign coils.

I've considered jumping the triggers of the ignition coil drivers internal in the DME to pair up the cylinders and only using cyl 1-4 ignition out for the MSD.

Mykk

Thank you. Any way to find that timing reduction table?

Mykk

Hey guys, can any confirm or deny if the Motronic M3.3 goes into waste spark when cam sensor is disconnected?

I've heard about the injectors going into batch fire and was wondering if ignition also went into waste spark. Thank you!

Mykk

Very cool stuff. I got started on putting together my own speeduino to sit in the DME case and utilize the 88 pin connector for stock wiring harness. So far I've got the Ardiuno Mega2560 and a gutted dme. Still awaiting the Sppeduino v0.4.4 board. Once the firmware is loaded on the arduino it connec...

Mykk

I've just set the Load Clamp table and the Latency table to 255 in my 404, throttle response has improved. Which adds to the fun factor of the drive

It seems my idle is smoother too

Mykk

I am so very thankful for these discoveries. About to go experiment with my 404, hopefully clean up a few transitional quirks.

If I may make a suggestion as to what to experiment with next; how about timers? Start up timers, etc.

Mykk

Acceleration enrichment tables, nice find! Good job. Thank you.

Mykk

You guys solved that 8x8 table I was asking about earlier in the 404, it's the same one you guys are talking about here with the 16x1 table following it. Thanks for that!

Mykk

https://www.youtube.com/watch?v=c_UQWqbNXgM

Mykk

What is the TPS function actually used for? When I tried it it was not actually traced? Is it reserved for the limp map? One would think it's because it's the only means of Load the computer has because there is no MAP sensor. I can tell you in factory tuning, the automatic and manual transmissions...

Mykk

In my 404 just beyond the MAF table I have what I assumed were 32x1 8bit tables, like 4 or 5 of them. I know one of them is the TPS transfer map. The others I couldn't figure out. Actually that whole section between the MAF and the first axis identifier & header'd table is a bit of a mistery. Th...

Mykk

Absolutely in, just don't have much to contribute as this is over my head. I have heard of people making standalone efi arduino units called Speeduino.

Mykk

bosch 60-2 trigger wheels - 4 data points per tooth, 60 teeth counting both leading and trailing edge = 120 edges. so 120 edges * 4 datas points means 480 points per rotation. 360/480 = 0.75 deg per data point. Cut out is offset by 45 degrees, thus offset by 60 data points. (45/0.75=60) Factor for ...

Mykk

The best explanation I've heard yet is in the 413 thread. bosch 60-2 trigger wheels - 4 data points per tooth, 60 teeth counting both leading and trailing edge = 120 edges. so 120 edges * 4 datas points means 480 points per rotation. 360/480 = 0.75 deg per data point. Cut out is offset by 45 degrees...

Mykk

The 404 DME has the same two tables. Both 5x5. Perhaps seeing them together could shine some light on their relation:

Mykk

In MAF fault mode (Alpha-N) there is correction for LOAD by actual idle valve position/duty cycle. I'm not find that factor/map yet, but there must be one. Excited for your findings. I also tried resetting the "injector constant" to the stock value, taking away the load scaling and instea...

Mykk

Mykk - You said Miller has a different ignition conversion factor? What do they have? If your not sure and want me to back calculate it then give me a PM. I wouldn't be comfortable using their ignition timing calc as it's likely converted for their specific coding and offset. On the left is tunerpr...

Mykk

Would you guys mind taking a look at a map in the 404 for me? There is an 8x8 RPM vs Load (D0 vs D5) table starting at CB7E that appears to be filled with raw timing values. According to cell hit tracing this table is always in use. Modifying the values in the table doesn't seem to affect vehicle be...

Mykk

I believe one to be IAC idle, PT, WOT...the other is IAC fuel cut/decel. I have them in my 404 as well and can watch them switch in and out while cell hit tracing when it goes into fuel cut off /decel.

Mykk

Any developments in the code work? Just went for a ride in a friends E30 he just converted to Megasquirt from a 153 or 173 dme. Runs so smooth compared to previous. It's super inticing to go standalone ecu. The more unknown variables we can remove from the equation the more we can tune these motroni...

Mykk

It would be interesting to see the similarities between M3.1 & M3.3 /M3.3.1. I wouldn't imagine much translates between the two platforms. But perhaps a little.

Mykk

OK, got it, would imply a 124mph speed limiter. What led you to that location? In my experimenting I noticed you can open a factory .bin in the Miller W.A.R. chip tuning software. If you save the .bin it saves in their format and converts the .bin to their specific flavor of hex code. But the map a...

Mykk

Hairyscreech wrote:Mykk - Where do you think the 404 speed limiter is on the 404? I will mark it on the sheets I have.

C08B - 167dec - Limiter
C08C - 4dec - Buffer

Mykk

Interesting that engineers would advance ign by a couple degrees in speed limiter fuel disable. Very cool find!

Unfortunately my 404 doesn't have the same three bytes, I have found speed limiter and buffer

Mykk

Any more insightful information about those DTC entry and exit values located between D22C through D28E. There's alot of code in there unaccounted for.

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Re: Crash course me on EEC-IV A3M

Crash course me on EEC-IV A3M

Crash course for GM TPI

M3.3 waste spark