MembersPage/TeroKortteenpohja (2007-04-25 05:19:49)

I already have installed Genboard v3 in VW Scirocco, with 1.8 20VT engine. Lots of configuration to be done.

Previously equipped with Megasquirt v2.2 with Extra code. Continuous problems with ecu changing settings by itself. Also coil charge times were not what they should've been (difference between MT readings and reality), so fed up with melted coils.


System consists of:

Injectors wired from A to D (will add pin#s later), configured to fire 2 banks (00..01) altenating. No sequential for now, camsync not in use at the moment. I'm trying to get the car running properly first.

Ignition coils wired to Ign00(pin35) and Ign5(pin12). Pin 12 used, beacuse for some reason, couldn't get spark from Ign01(pin33). This shouldn't be a problem, should it? These all are low level outputs anyway. Coilpack has built-in IGBTs.


Here I will show my configurations for Megatune. I'll try and explain every option possible. I will update when i find answers to my own questions first. My opinion is, this Wiki is like hell to try and find something usefull. It took me more than hour to find info how to configure fuel pump output to work.

These pages are good starting points: GenBoard/Manual and MembersPage/PhatBob/UserGuide - Mattias


ign advance - configuration or measurement problem ?

Car runs fine. If advance is forced (terminal command) to 10deg, it is 10deg. But when forced 20 or 25deg, it really is 25 or 30deg.

Here's how it went:

For 15 crankdeg ignadv command change (10..25), measurement shows appr 30 crankdeg change (1..30).

Our first guess was that something misconfigured, eg. for 2 cyl. But I couldn't spot such problem. Eg. RPM constant is 3000 (12000/4, so looks good for 4 cyl):

So it is kindof likely that using wasted spark, your smart strobe light gets confused. We've seen that happening (yes: a dummy light is often better - harder to get bad readings). Consult the the timing light userguide to investigate this.

Yes, I thought that too, but i have been measuring with this (Snap-On) tool for ages, never had any such problems before. It is a known fact though, that with this lamp, you cannot get sensible reading with advance selection at 0deg. It has to be 1 or more. I have measured dozens of VAG cars with this, including my own cars former setup with MS-Extra. I will check this anyway, maybe build a dumb-light from a bright led.

Assuming info on refcard.pdf means, mdaxx = force advance xx units, where 1 unit means 0.25deg. So 0x28 equals 10deg, 0x3c equals 15deg, 0x50 equals 20deg. => exactly. More notes:

0x50 = 5 x 16 = 80 => 80 x 0.25 = 20 deg. True. Do you have any wheel errors ? 2nd or 3rd LCD display. - Mattias

Megatune lights up a light if trigger "wheel-errors" count up to a certain number (10 or 16 or similar: might light up if engine restarted several times without ECU reboot => that is normal).

On some page was told that mlp01 takes me to the page with errors and counters, but theres just bunch of hex. W.. is the "wheel-error counter". More on [InputTrigger/TriggerLog]

Need help to translate this log-file to understandable form, anyone?

[TeroK Scirocco triggerlog 14-04-2007]

Taken with terminal program (apparently brayterm). [analyzed file zip].

perl bin/binary.pl <start_14-04-2007.bin >start_14-04-2007.txt

Looks like a 60-2 connected with good polarity. Segments like this (left side) look good (missing tooth is 3 times longer than normal tooth, actually surprisingly precisely):\n

1078    837     1 
1079                                                    17667   1.04 
1080    849     1.01 
1081                                                    20746   1.17 
1082    2561    3.01 MISSINGTOOTH 58
1083                                                    260     0.01 
1084    872     0.34 
1085                                                    26627   102.41 MISSINGTOOTH 11
1086    861     0.98 
1087                                                    23556   0.88 
1088    898     1.04 
1089                                                    33283   1.41 
1090    899     1 
1091                                                    33540   1 
1092    947     1.05 
1093                                                    45828   1.36 
1094    957     1.01 
1095                                                    48388   1.05 
1096    1013    1.05 
1097                                                    62724   1.29 
1098    1050    1.03 
1099                                                    6660    0.1 
1100    1133    1.07 
1101                                                    27909   4.19 MISSINGTOOTH 8
1102    1195    1.05 
1103                                                    43781   1.56 MISSINGTOOTH 1
1104    1290    1.07 
1105                                                    2565    0.05 
1106    1347    1.04 
1107                                                    17157   6.68 MISSINGTOOTH 2
1108    1374    1.02 
1109                                                    24070   1.4 
1110    1312    0.95 
1111                                                    8196    0.34 
1112    1239    0.94 

Your slowest tooth in above run is 1374 * 4 usec long, at position 1108,

(1108 1374), that is 13 tooth after tooth0 (the first tooth after missing tooth at position 1082 (1108-1082)/2 =13). If we put trigger tooth to 03, we have appr 10 more teeth (60 crankdeg) for ign_tdcdelay (but maybe 02 is better in reality, your timing light will help):

Approximate:

So, what are those other "missingtooth" markings? Should there be just "missingtooth 58" markings, and nothing more? Does this mean there are some errors?


WBO2, strange behaviour

First wbo sensor i got, works in mysterious ways. After i got the factory settings for controller calibration, namely:

I double checked the voltages according to PhatBob's manual. Everything were ok. When i started the free-air calibration, O2-reading swinged between 11,1 and 12%. This might be OK, depending on sensor calibration:

Just to make sure, i connected another sensor (from Innovate LC-1). Then it showed 20,9..21%, as it should.

What could be, for example, this unsuitable node?

My WBO2 supply is wired parallel to Vems supply, with own fuse ofcourse. Just like in PhatBobs manual.

  • AFR=? 13.3
  • AFR=11.58 P ON

basic_settings.jpg

constants.jpg

primary_trigger.jpg

injector_settings.jpg