xr4tic

I have a stock .bin file for a non-dbw 1.8T

Here is a timing map I created:
<img src="http://pictureposter.audiworld.com/12130/advance2.jpg">

It's a 12 x 16 map. I'm guessing Load vs. RPM goes on the bottom, but not sure which is which.
Timing usually increases with RPM, but decreases with load. So I would guess that 16 is the RPM side, and 12 is the Load side.

The sides are the timing values in hex divided by 4 (the max point is 5Ah = 90d / 4 = 22.5)

However, the most I've seen my GIAC make was 18 degrees, so I don't see how the stock chip can hit 22.5. On the other hand, this could be the raw timing which then gets modified by some other factors (high intake temps for one)

There are actually four of these maps, and they are exactly the same (one for each cylinder? Who knows?)

Anybody have some load vs. RPM vs. timing data logging of the stock chip? If not, can someone do some logging for me? Please?

I was working on a disassembly of the code, but I kind of hit a dead end right now. Anybody good at working with microcomputer assembly code? I'm a little rusty at it.

dingster

Yep, looks like left is load and right is rpm. This is a WOT table I assume? I see timing way more advanced thant that during part throttle, part load.

I think you can also log timing correction to see if you're getting any. Also stock doesn't run nearly as much boost maybe that why the timing could be more advanced to reduce polution?

xr4tic

4 that are 12 x 16 (we'll label them 1 - 4) and 2 that are 16 x 16 (5 and 6)
1 and 2 are the same as each other, and 3 and 4 are the same as each other (just a few bytes off on the low end as compared to 1 and 2)
5 and 6 are identical to each other.

I would guess that with an extra 4 load points per RPM, that 5 and 6 are part throttle maps, since the higher resolution would provide better driveability and emissions. But the values on 5 and 6 are just like 1-4 on the high-end, and the low-end has lower values.

I had always heard that the aftermarket chips advanced the timing, and that was one of the reasons why they got slightly better gas mileage.

Once I get this figured out, then I can move onto the fuel and boost maps....

dingster

But at full throttle there's so much boost timing should be less than stock. I've seen K04 programs hold 16 degrees with FMIC and less without. DBW has even less timing. Only 3 to 6 degrees under boost. I guess some tuners like boost more than timing, more air/fuel = more power. Not always the case tho when timing has to be retarded :\

xr4tic

I just looked at some of the datalogs I had (timing vs. RPM, not load unfortunately) and while I was launching by slipping the clutch (which should be low-load situation), the timing was around 40 degrees, then when fully engaged, the timing hit 0, then dropped back to 12 (or 18 if WI was on). During shifts the timing would spike to 35 or so.

I just bought an EEPROM programmer, should be here before the end of the week. It'll be interesting to see exactly what kind of changes GIAC has over stock (and no, I won't be giving out GIAC's code)

Žob

Thats pretty good John. Email me and tell me how you did that

xr4tic

basically I can load a bin file, search throgh the code to find the maps (it's pretty obvious if you can see it graphically) and viola, you have a nice 3D map. The locations, size, and configuration are then stored in a resource file.
Once you have the map, you can make changes to it, and save it in the BIN file. It's pretty cool.

The software isn't free though. I used an EEPROM programmer to read the stock chip I have. If you (or anyone) has a stock chip laying around, I'd be glad to read it (as long as it's a 44-pin PSOP or 48-pin or less DIP)

This is the data that corresponds to the graph I made (in case anyone is curious):

//ADVANCE 2
B7B3 - 2E,2E,2A,26,1E,1A,18,17,16,14,13,12
B7BF - 33,33,33,2F,28,21,20,1D,1B,18,16,13
B7CB - 35,39,3C,37,2E,27,26,20,1D,1A,17,14
B7D7 - 3B,41,43,3E,36,2F,2B,27,25,21,1C,18
B7E3 - 3C,44,47,42,3B,33,2F,2B,27,23,21,19
B7EF - 3D,46,48,42,3B,33,30,2C,28,24,21,1E
B7FB - 3E,49,4A,43,3C,34,30,2C,28,25,22,20
B807 - 3F,4B,4C,44,3D,35,31,2D,29,26,23,20
B813 - 40,4C,4F,47,40,3B,37,33,2F,2D,2A,27
B81F - 42,4F,51,4A,44,3E,3B,36,33,31,2D,2A
B82B - 45,51,55,50,4A,44,40,3D,3C,39,37,34
B837 - 46,52,56,51,4C,47,44,41,40,3D,39,36
B843 - 47,54,58,54,4E,4B,49,45,43,3F,3B,36
B84F - 48,56,59,56,51,4D,4A,46,42,3F,3B,36
B85B - 49,57,5A,58,54,4F,4D,48,40,3A,38,35
B867 - 4A,57,5A,59,55,50,4E,45,3F,3B,39,36

dingster

just thought of this.. 22 degrees is high rpm and low load. Look at the high load high rpm situation. On the stock map it's only around 13 degrees. I guess the aftermarket chips do advance the timing if the table values are correct.

Mike O.

...idle, part throttle and WOT. I don't know whether they flop back and forth between maps at part throttle, but the idle and WOT maps should be fixed maps.

Mike O.

xr4tic

Each pair is identical. Set 1 and 2 are 12x16, Set 3 is 16 x 16.

The only difference between Set 1 and 2 is the notch you see in the middle left corner.

Set 3 has the least agressive timing, so I wonder if it is the WOT table....

I would think that idle would have a 2D map, I don't see a need for a huge 3D map for such a limited rev/load range.
OTOH, Set 2 with that notch could be the idle range (low load, low RPM).....

Hmmm.....

Set 1:
<img src="http://pictureposter.audiworld.com/12130/advance1.jpg">

Set2:
<img src="http://pictureposter.audiworld.com/12130/advance3.jpg">

Set 3:
<img src="http://pictureposter.audiworld.com/12130/advance5.jpg">