Hi :)
Need som help setting up my VEMS Motronic-55, on my AUDI RS2
Engine info:
- It`s an ADU engine, 5 high output coils with built in drivers.
- 720cc high-Ohm injectors. I have some 1600cc (4.5 Ohm, don't need power resistor)
- custom cams and ported cylhead
- JE pistons
- H-beam rods
- 82.5mm bore
- 92.6mm stroke
- Turbonetics gtk 650
- 89mm exhaust
- 034 motorsport high output coil pack (5 coils) standar POS not used.
Okay, got my car running with vems :) But now i got a little problem.. I had a little accident, and managed to change the rpm constant to 5000 with a running engine.. The engine stalled, and now i get no rpm signal. What could have happend? I changed it back to 2400, but no signal.
Q: So my high Ohm 720cc injectors need power resistors? I think mine is the same as sold in the vems shop. Siemens deka 727cc@ 4bar
A: If you had written that they were high ohm you could've drawn your own conclusion = you don't need power resistors. Since you didn't write anything, I assumed they were low-Ohm, in which case you would've needed power resistors. It's _very_ rare to find high-ohm injectors larger than 500 cc/min,
Q: I have changed my mind, and want to go for the NTC type IAT sensor. My vems is set up for the PTC type.
What to do?
A: Remove the additional pull-up resistor on the PCB which is mounted on top of the regular pull-up for the IAT analog input. Other people might clarify with pictures of the PCB and where you must do the work.
A: I allso recived an e-mail from vems shop now:
Fortunately this is easy. Remove endplate (endplate only, 4 screws).You see a small resistor near the main processor, close to board edge, parallel to board edge.An 510 Ohm (0805 size SMD) resistor is piggybacked on a 2k7 resistor.Remove the 510 ohm, and you just converted back to a normal weak pullup suitable for NTC.
I guess this would be easy.
Q: I have some msq files for the motronic 55, but i can not understand the ignition outputs.. what is H[2]? and what does 04..00 stand for? Does this have any thing to do with the fiering order?
A: The H2 is the exact firing order of the ign outputs more info at this page http://www.vems.hu/wiki/index.php?page=GenBoard%2FManual%2FDigitalOut%2FTable
If the car is Audi s2 you will find some useful info in this page http://www.vems.hu/wiki/index.php?page=MembersPage%2FPeterJensen/AudiSwiring
Regards Peter
Use this config: http://www.vems.hu/files/MembersPage/MattiasSandgren/OskarNilssonsAudiSFour/oskar_optimized_power_20080506.msq
The ignition coil firing order can't be questioned, this is how it's wired to work with the pnp VEMS box using the stock harness and the trigger settings. You must use the settings from Oskars msq file.
About the the injector firing order, I updated the VemsAudiAan page with more information about that. The table is correct in that it fires the injectors in the correct order. You can rotate/shift the table any way you wan't - it won't make any difference on this engine. True sequential injection control with a table for injection end angle is not required.
This means that : 8,4,2,1,16 = 2,1,16,8,4
Or as in Oskars msq : 16,8,4,2,1.
These three examples are all in the same firing order, only rotated/shifted.
Q: What firmware to use? can i use 1.1.23 12x12?
A: Don't use 1.1.23. See this page: MembersPage/MattiasSandgren/OskarAudiSFour
Download 1.1.27 on the MegaTune page and go from there.
Q: How to upload tempsensor files?
A: You have to use the tempsensor_upload script that comes with the MegaTune package to upload a firmware containing the correct temperature tables, see EasyTherm and EasyTherm/SensorTable.
Q: When i downloaded megasquirt, there was a PINOUT picture included.. Is there a simular picture for the Motronic 55 plug?
A: Begin reading here: VemsAudiAan Take a look at the spreadsheet and as hinted earlier you can find a picture here: MembersPage/PeterJensen/AudiSwiring