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Danish VW beach buggy Vems v3.1 project. 4 cyl boxer engine, port inj, wasted spark. Im still soldering but having a hard time finding the right dokumentation for v3.1 * See GenBoard/VerThree/Schematic ** it's almost same as v3.6 or v3.7 except minor layout changes and v3.1 lacks cam-HALL inverter 23-05-2013 Before pictures. Topside www.dropbox.com/s/wohkjdyu889yo66/2013-05-21%2001.28.01.jpg Bottom www.dropbox.com/s/73q3ywo2wmqegbz/2013-05-21%2001.27.01.jpg ---- So far i have mounted. Flyback diodes M 724 B14 ZP -> lowZ? confirmed ok. Transient protection diode 1.5KE18A L3 1R5 ok Resistor briged 5X-1-103 26/06/2013 Flyback wire Fuse1 Connectors 4 IRF640N inj FETs 4 22ohm resistors 2 N408AB 14N40FVL FETs ---- Not mounted jet. Mapsensor Anything else missing ? Topside www.dropbox.com/s/5lrytxlz9129kc4/2013-05-23%2000.39.58.jpg Bottom www.dropbox.com/s/97iwhmmsr837lg8/2013-05-23%2000.40.18.jpg ---- 27/06/2013 I have connection problems Any tricks to connect a very old board (number 57) to vemstune ? im receiving 192byte's from ECU (sending 84byte) before getting "Could not find ECU" ---- 28/06/2013 Problem with comunication fixed, forced into bootloader mode and updated firmware to "1.1.94 bootloader update" Whats the recommended firmware version ?? * [http://www.vems.hu/wiki/index.php?action=history&page=GenBoard%2FUnderDevelopment%2FFirmwareChanges 1.2.11] ---- '''Trigger Setup''' Is this set up for primary hall sensor ? Picture: www.dropbox.com/s/5lrytxlz9129kc4/2013-05-23%2000.39.58.jpg Not really, you need for '''primtrig HALL: SJ2 closed !!!''', SJ6 open (which is so), see GenBoard/Manual/InputTriggerHardWare Links: * GenBoard/Manual/InputTriggerHardWare * [v3.1 schematic] ** http://www.vems.hu/files/genboardv3/vems_v31_r222_top.pdf ** http://www.vems.hu/files/genboardv3/vems_v31_r222_bottom.pdf ---- 14/4/2014 '''Trigger Setup''' I found out that I have a VR sensor instead of a Hall sensor... dooh ;-) R30 = Removede again C88 = Not mounted R55 = 10Kohm SJ1 = Shorted SJ2 = 10Kohm <- '''is this ok ?''' SJ6 = Shorted D14 = Not mounted R56 = mounted again = 10Kohm C30 = ok R57 = 75Kohm R87 = 1000Kohm C38 = ok R88 = 10Kohm C31 = ok C39 = ok Mesurement between Trigger1 connecter and LM1815 pin3 = 20Kohm = ok Mesurement between LM1815 pin12 and AVR pin 29 = 0ohm = ok ---- 19/04/2014 '''Grounding on fiberglass buggy''' Where should i put my grounds ? Engine is under the black cross Battery is under the blue cross Ecu is mounted on a 2mm stainless steel plate, i have prepared a line of 6mm bolts for grounding on the plate. Where to put GND5. (powerground) ? Where to put sensor GND. ? Picture -> www.dropbox.com/s/47uucgpqvje1tc4/buggy-vems-grunding.jpg * Should I just do like this and connect a big 16mm2 from engine->ecu plate->battery ? ** Sounds reasonable. Should be good as long as "star (or tree) topology" (no ring or other ground loop) and the wires are sufficiently thick. Voltage spikes are more common with non-conducting chassis (eg the USB-RS232 adapter loses connection with sparks, indicates voltage spikes much earlier than any other component). You might need to use shielded cable for triggers, and for ignition. Shield connected to GND only at one end, of course (preferrably at the main harness GND junction) ***20/04/2014. Ok i found som 50mm2 cable that i will connect battery -> ecu plate -> engine. ***I will shield cranktrigger (at common ground on ecu plate) ***i will shield wires from ecu to ignition coil (at common ground on ecu plate) http://i54.photobucket.com/albums/g109/damodevilsson/my%20200sx/DSC00143.jpg ---- '''Bosch MAP sensor gives weird voltage''' I have this bosch map-sensor 0 281 002 316 (0.2-4bar) the problem is that the MAP sensor gives about 4.2 volts when the engine is stopped (101 kPa). I had expected about 1.7 volts.... Yes, that expectation is good. Vemstune shows about 337kpa which approximately matches the 4.2V input: (4.2 - 0.2) * 400/4.6=347 kPa (would be good after offset tuning). MAP sensor is coupled direct onto the PCB where the internal normally sit, by a cable. That's OK. I there anyway to calibrate the map-sensor. Calibration requires at least 2 points. If you can measure at a different pressures, than calibration might be possible. It would be nice to measure at * 30kPa=atm-0.7 bar vacuum * and 350kPa=atm+2.5 bar boost) also. Do you suspect it's reverse slope (lower voltage for higher pressure) ? I guess there is no accidental pullup to 5V (at least unlikely: for MAP, there is no pullup resistor provision onboard). Or maybe it's frequency output (not analog voltage) as some Ford sensors ?
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