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= VEMS v3.3 installation instructions = These instructions are written for a typical Windows Installation. It is assumed that the reader is well versed with fuel injection theory and has a working knowledge of the electronics that make up an engine management system i.e. the sensor types, fuel injector impedences and ignition types. Engine management systems give you the control you need to get the best from your engine, but they have a huge potential for damage, both of your engine and you and your property. This potential is lessened if you follow some simple rules. * '''You MUST have a fire extingusher on hand''' * Correct Power connection is '''ESSENTIAL''' read then re-read the information in Step One, failure to connect the grounds properly '''will damage your unit''' * The most important sensor is the primary trigger (crank sensor or distributor trigger), get this working first. * Connect and test the sensors before you consider connecting injectors, fuel pump relays etc. * When testing your connectors you will often need to turn the engine on the starter motor, remove your spark plugs to reduce the load on the starter, don't run the starter for too long, keep an eye on the temperature of the starter motor, battery and starter motor cable, these can get hot and overloaded. * Connect your ignition components first, follow the steps in the Configuring Ignition section. * Start with conservative maps, tuning is an itterative process, your first task will be to get the engine to idle, then to hold rpm without load. It is important to follow the guide in the defined steps, failure to do this may result in you frying your VEMS module. == In-car installation == Although VEMS has good environmental protection the engine bay of a car is still a very hostile place to install your VEMS module, so its a good idea to follow the lead of most car manufacturers and keep the ECU inside the passenger compartment. ---- = Setting up your PC = The easiest way to configure and tune your VEMS unit is to use a PC, there are a number of tools which will need to be installed before we can start to setup VEMS. MegaTune package, the latest version of which can be obtained from: http://www.vems.hu/wiki/index.php?page=MegaTune ---- = Step One - Connecting power & testing = '''IMPORTANT''' Read these instructions carefully, correct and proper grounding of your VEMS unit is essential for its life and successful operation. If you fail to connect your unit correctly you will '''AT BEST''' damage it. ''The EC36 is the larger Econoseal 36pin plug, and EC18 is the smaller Econoseal plug.'' '''Power Grounds''' (also called as "GND5" in some documents) * EC36-pin5 to Common Ground * EC36-pin21 to Common Ground * EC36-pin32 to Common Ground * EC36-pin22 to Common Ground ''Note: pin22's connection is optional, but usually used as an extra GND signal.'' '''Sensor Ground''' * EC36-pin26 to Common Ground. ''NOTE: Sensor Ground pin has many connections (CAS, TPS, IAT, CLT ...) make provision for this in your wiring loom.'' * Keep the ''''connection from the Power Ground pins to the Common Ground point short, max 1m''' (this often means that the GND and GND5 currents must travel together from the Common Ground point to reach the mounting point at the engine or battery. Read along to find out why this is OK) * Keep the '''connection to Sensor Ground from the sensor wires close to EC36-pin26''' ( 0 .. 1 meter). This is most critical for the VR sensor (VR- signal, that goes to GND). ** Power Ground (GND5) is noisy from Ignition and Injection events, but this way the noise cannot effect the sensor's signal (only the main supply will fluctuate a bit, which is well tolerated) '''Common Ground''' The engine block is the best point from many perspectives. But it is of some importance to keep this ground point away from the alternator and starter ground paths, you can do this but adding extra grounding wire at the alternator to ensure a path of low resistance. Having the ground path for the alternator, starter and the ecu at the same point is not a good idea. So keep the ECU connection to the block as far away as possible. * If the alternator is bolted to the engine block you way want to ground the ECU to the head * If the alternator is bolted to the cylinder head you may want to ground the ECU through the engine block, well away from the ground strap. * On engines like those fitted to some Audis (Where the alternator is bolted to the head) it is acceptable to bolt the ECU earth to the far side of the cylinder head. Your ecu will always share some of the groundpath with the alternator. You want to make sure that the shared path is as short as possible and that it is as low resistance as possible. Grounding directly at the battery is not a good idea, at the negative of the battery you '''always''' see the current pulsations from the alternator and starter, the big currents flow from battery to starter and alternator to battery, although you may hope that the battery may act as a buffer, lead batteries are pretty slow and it doesn't filter the noise very well. The placement of the battery also change a lot of things, if you have a battery located in the boot you could need upto five 4m wires. Also And the connection at battery connectors is often forgotten by techs, are subject to aggressive corrosion, abused when connecting jump leads. Connecting to the chassis is often a bad idea, the body of the car is an inferno of ground currents. For example the wipers, electric seats (consuming 50A+ when operated) etc may be grounded at the same point as the ECU. And voltage fluctuations are are higher as you get further from the battery. '''+12V Supply''' *EC36-pin25 3A Fused +12v supply Note that if you have moved the battery to the rear of the car you may want to run separate wires for the starter/alternator and for the cars electrical system to the battery. Otherwise the several meters long cable will cause a significant voltage drop during cranking that will cause the ECU to reset when the battery starts to run low. This may prevent the car from starting even if the engine cranks over. Once you have connected and checked the continuity of ground you can connect your VEMS unit to the EC36 plug and apply the power supply. There is little point in connecting power until the serial connector or LCD screen has been connected. http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingPower2.png == Connecting serial port == To allow the connection of the VEMS unit to your PC a serial port plug must be connected as follows. * EC18-pin14 to DSUB9-pin3 * EC18-pin15 to DSUB9-pin2 * EC36-pin26 to DSUB9-pin5 (GND). http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingSerialPort.png == Connecting the LCD == The LCD option is a very useful addition to your VEMS module - with the use of an IBM PC keyboard it becomes invaluable as you will be able to configure your system without having to use a laptop. In the first instance it will provide a method of checking that your VEMS system is working. At present the LCD is provided without wiring, so you will need to connect it using a Female DB9 plug in the following way: To control brightness and contrast (connection advice) * LCD-J1 to LCD-J16 * LCD-J1 to LCD-J3 (2,4K ohm resistor) * LCD-J2 to LCD-J15 (27 ohm resistor) To connect the LCD to VEMS (suggested wire colour) * LCD-J1 to DSUB9-pin5 (brown) * LCD-J2 to DSUB9-pin1 (red) * LCD-J4 to DSUB9-pin9 (white) * LCD-J5 to DSUB9-pin6 (orange) * LCD-J6 to DSUB9-pin2 (violet) * LCD-J11 to DSUB9-pin3 (green) * LCD-J12 to DSUB9-pin7 (grey) * LCD-J13 to DSUB9-pin4 (blue) * LCD-J14 to DSUB9-pin8 (black) http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingLCD.png == Testing the VEMS unit == First connect your VEMS serial cable (see Step Two), and make sure that there are no applications that use the serial port running on your PC, applications such as Palm Pilot HotSync. Connect the EC-18 connector with the serial port to VEMS. And then connect the EC-36 connector with the power supply. Navigate to the directory that you installed MegaTune into and double click on the megatune.exe application, and you will be presented with a window: http://vems.hu/www.vems.co.uk/VEMSUserManual/SelectProject.png Select the VEMS Standard 12x12 (Default) option and click OK. http://vems.hu/www.vems.co.uk/VEMSUserManual/MTMainScreenWrong.png On the Menu bar select Communications->Settings... http://vems.hu/www.vems.co.uk/VEMSUserManual/CommunicationSettings.png Select the com port that VEMS is connected to, and click the 'Click to test' button, if all is well you will see the success message http://vems.hu/www.vems.co.uk/VEMSUserManual/CommunicationSettingsTested.png This shows that your VEMS module is alive and communicating with the PC, close the Settings window and you should see something similar to this: http://vems.hu/www.vems.co.uk/VEMSUserManual/MTMainScreen.png Close MegaTune and disconnect VEMS from its power supply. ---- = Step Two - Connecting and configuring sensors = The trigger is the engine management system's most fundamental sensor, without one VEMS cannot calculate engine speed or crank angle. If you are connecting VEMS to an engine that has an existing engine management system, if not then a triggering method will need to be put in place. The simplest type of trigger is to use the existing distributor to provide a pulse for each cylinder. This type of trigger is more than adiquate for driving ignition through a distributor and batch fire injection. == Connecting the primary trigger (CAS) == '''Magenetic sensor / Variable reluctance (VR)''' Mechanical considerations (need to be written somewhere and referenced from here) The VR sensing circuitry is very sensative to electrical noise, sheilded cable (coax) must be used and good grounding is vital. * EC36-pin27 VR+ (central wire in coax) * EC36-pin26 VR- (sheild and ground) http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingPrimaryVRTrigger.png Shielding should be grounded to engine block close to the VR Sensor. '''Hall Sensor''' VEMS is available configured for Hall sensors, these are more noise tollerant and require a +5V supply. * EC36-pin27 Hall signal * EC36-pin26 Ground * EC36-pin28 +5V '''Pin 29 shown in illustration, please change.''' http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingPrimaryHallTrigger.png == Connecting the secondary sensor (optional) == '''Magenetic sensor / Variable reluctance (VR)''' With the same considerations with the primary trigger regarding electrical noise. * EC36-pin13 VR+ (central wire in coax) * EC36-pin26 VR- (sheild and ground) http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingSecondaryVRTrigger.png '''Hall Sensor''' * EC36-pin13 Hall Signal * EC36-pin26 Ground * EC36-pin28 +5V http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingSecondaryHallTrigger.png == Configuring the system to use the Crank sensor == === Primary Trigger === Configuration is done through MegaTune menu option: Settings->Primary Trigger http://vems.hu/www.vems.co.uk/VEMSUserManual/MTPrimaryTrigger.png ''Simple Trigger'' In its simplest form your VEMS will trigger from a simple pulse per firing event which is called Coil Type trigger as the trigger signal usually comes from the distributor or coil. To select this type of trigger select 'Coil-type' from the Type dropdown list. ''Multi-Tooth Trigger'' Because of its highly flexible triggering system VEMS needs to be configured correctly, thankfully the complex task of seting up the system has been made a great deal easier with the utility here: http://www.starshadow.com/~koabi/carstuff/cranktriggers.php Typical trigger settings... === Secondary Trigger (Cam Sync) === For fully sequential ignition/injection you will need to use the secondary trigger option. Configuration is done through the MegaTune menu option: Settings->Secondary trigger/Cam sync settings http://vems.hu/www.vems.co.uk/VEMSUserManual/MTSecondaryTrigger.png === Testing the crank sensor === Make sure that the fuel pump and injectors are not active by removing their fuses. Start MegaTune and leave it showing the main screen (with the guage display) == Temperature Sensors == VEMS uses two temperature sensors: Inlet Air Temperature which is used in speed/density systems to calculate the amount of fuel required. And Coolant Temperature which is used to meter the required amount of warm-up fuel enrichment. === Connecting the inlet air temp. sensor (IAT) === If you are using a VEMS MAP sensor please refer to the section titled '''Connecting an external MAP sensor''' * EC36-pin2 Signal * EC36-pin26 Ground http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingIAT.png === Connecting the coolant temp. sensor (CLT) === * EC36-pin14 Signal * EC36-pin26 Ground http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingCLT.png === Configuring the temperature sensors === Use EasyTherm to build tables. Upload tables. === Testing the temperature sensors === Using MegaTune. Check ambient temperature with thermometer Check sensors reading on MegaTune or Motuner, compare with thermometer. Apply known heat (boiling water) and check reading. Apply known cold (ice) and check reading. == Connecting the throttle position sensor (TPS) == The throttle position sensor is used by VEMS to provide fuel requirements in Alpha-N configuration and acceleration enrichment. * EC36-pin28 +5v out * EC36-pin1 Wiper out (0-5v) * EC36-pin26 Ground http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingTPS.png === Configuring and testing the TPS === Configuration is done using MegaTune Settings->Basic Settings http://vems.hu/www.vems.co.uk/VEMSUserManual/MTTPS.png '''Setting TPS Low''' Ensure that the throttle is fully closed by setting the idle adjustment screw to its minimum. Adjust the TPS Low (ADC) value down so that TPS reads 0% Finally turn the idle adjustment screw to open the throttle plate slightly. You will need to fine adjust it later. '''Setting TPS High''' Before setting any values ensure that your accelerator pedal fully opens the throttle plate. With the throttle fully open adjust the TPS High (ADC) value until the TPS reads 100%. == Connecting manifold air pressure (MAP) sensor == In early versions the MAP sensor is built in to the VEMS module. In order to ease installation it is suggested that an external sensor such as the VEMS 250kpa or high boost (over 18psi) 400kpa sensor, or the OEM sensor be used. === Connecting an external MAP sensor === VEMS MAP sensors come in either 5V or 12V supply options, the pin outs of which are: 5 Volt Supply option * MAP-pin1 MAP out (0 to 4.8V) * MAP-pin2 GND * MAP-pin3 5V Supply * MAP-pin4 IAT * MAP-pin5 * MAP-pin6 No Connection 12Volt Supply option * MAP-pin1 MAP out (0 to 4.8V) * MAP-pin2 GND * MAP-pin3 ''5V OUT'' * MAP-pin4 IAT * MAP-pin5 * MAP-pin6 12 Supply Connections to VEMS will be: * EC18-pin6 to MAP-pin1 * EC36-pin27 to MAP-pin3 ''5Volt only'' * EC36-pin2 to MAP-pin4 * EC36-pin26 to MAP-pin5 http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingExternalMAP.png === Connecting the internal (old style) MAP sensor === To connect the internal MAP you will need to route some 6 or 8mm tubing from the manifold to the VEMS module. It is advisable to use copper brake pipe for long pipe runs especially near heat in the engine bay. === Configuring and Testing the MAP sensor === Using MegaTune Settings->Basic Settings http://vems.hu/www.vems.co.uk/VEMSUserManual/MTMAP.png '''Setting Map sensor range''' Map sensor range is set to the maximum kpa value of your MAP sensor, if you are using the VEMS sensors this is either 250 or 400, for other sensors you will need to refer to the manufacturer for the sensor's maximum range. '''Setting Map sensor offset''' Consult your local weather for the current air pressure, this tends to range from 995 to 1028 or there abouts. Adjust the Map sensor offset value until the MAP reading reflects the current air pressure (typically between 99kpa and 103kpa). == Connecting WBO2 Sensor == * EC18-pin13 to WB6-pin1 (Nerst Cell Signal) * EC18-pin7 to WB6-pin5 (WBO2 Pump-) * EC18-pin18 to WB6-pin4 (WBO2 Heater) * EC18-pin9 to WB6-pin6 (WBO2 Pump+) http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingWBO2Sensor.png Before we actually plug the wide band in we need to do some tests and calibration. === Calibrating the WB02 controller circuit === The first check is 'Pump Zero DC', so you will need to take a reading with a DVM across pins 5&6 of the Wideband connector. The ideal voltage is zero, to adjust the voltage you will need to change the values of ''wbo2_pump_pw_zero'' in config.txt. ''wbo2_pump_pw_zero'' value is adjusted during factory test, saved in ECM eeprom. Don't forget to save the output of Manmcd before tinkering with MegaTune or settings. ''wbo2_pump_pw_zero'' is also written in the WebShop "Sentout" notification email. However, it is recommended to do the test to be sure. The wbo2_pump_pw_zero value is likely between 0x63 to 0x66 (99 .. 102 decimal as adjusted in MegaTune 'Pump Zero DC'). Example: * at wbo2_pump_pw_zero=0x65 I measured 0.10v * changing to wbo2_pump_pw_zero=0x64 resulted in a reading of -0.17 * and 0x66 took the reading up to 0.4v. '''Note that WBO2 must be restarted for the value to take effect''' (reboot the board, or use {{mde02mde00}} command). Once you are satisfied that ''wbo2_pump_pw_zero'' is as close to 0v as it can be, you should verify the pump and nernst control voltages. You'll need two 100 Ohm resistors. Power down the board then * insert one 100 ohm resistor between wbo2_pin1 and wbo2_pin6 * and the other 100 ohm resistor between wbo2_pin1 and wbo2_pin5. * Power up the board, and switch to LCD page 7 using the command {{mlp07}}. * Enable the WBO2 heater with {{mde02}}, and wait for the O2% to be displayed. Just to verify, check that the voltage between ground and wbo2_pin5 (nernst-) reads appr 4V. 3.9V .. 4.1V is perfect. Note that this cannot be change in configuration or firmware, it's controlled by hardware. If less than 3.8V or above 4.2V, there is good chance the wiring is bad, check it. Using a DVM, check that voltage between wbo2_pin1 and wbo2_pin5 reads appr 0.45V (0.44V or 0.46V is just as good). If it's slightly out, you can adjust ''nernst_dc_target'' to raise or lower the voltage. As before, you'll have restart the board between any config value changes. If you cannot get close to this 0.45V target, check the values wbo2_pump_pid ... for example ''wbo2_pump_pid_ki'' and ''wbo2_pump_pid_ilimit'', against a known good config. Finally, verify with the DVM that the difference is 0.45V. * Send {{mde00}} to turn off the WBO2 heater. === Calibrating the WB02 sensor === Now that the controller is calibrated, you can connect the sensor and calibrate it against fresh air. Ensure that the sensor body is grounded, and power up the board. Switch to LCD page 7 using the command {{mlp07}}, and enable the WBO2 heater with {{mde02}}. Wait for the O2% to be displayed. Send {{mde00}} to turn off the WBO2 heater. Adjust the value of ''wbo2_calibration'' and repeat until the O2% reads (or preferably fluctuates between) 20.9 to 21.0. Values around 0xA8-0xB0 are typical. Again, you'll have restart the board between value changes. ''Note: If you're using a terminal instead of an LCD, you may have to run {{mld}} and {{mll}} a few times to get the display to update correctly with the sensor connected.'' == Connecting exhaust gas temperature sensor (EGT) - Optional == Temp. compensated cable, blah blah blah. There are 2 standards that are the most common. You must make sure the + and - are connected properly. Everything is the same between the standards other than the colors. They are fully interchangable. || ||British standard||American Standard|| ||connector||green||yellow|| ||wire insulation||green||yellow|| || + wire||green||yellow|| || - wire||white||red|| http://vems.hu/www.vems.co.uk/VEMSUserManual/EGTConnector.jpg === Configuring EGT sensor === Before we can rely on the sensor's readings we need to calibrate VEMS. This is best done using boiling water as we know that at sea-level this boils at 100degreesC. Make sure that the sensor does not touch the sides of the vessel containing the boiling water as this will result in an inaccurate reading. At 100degreesC the voltage fromt the sensor (measured across pins 1&8) should read:4.095mV and AD597's output (pins 4&6) will be 1005mV. Calibration is required to enable VEMS to display and log the temperature value correctly, there are two values in the Config file that are used to do this: * egt1_cal=49 # EGT calibration multiplier * egt1_offs=00 # EGT offset (signed e.g. 0xF0 is -1) (The change values are quite small so try increasing in steps of +/-0x5 initially.) The EGT reading should be on the LCD screen's first page, to show EGT alone you can use Bray terminal to change to page 8 by using the command: ''Manmde08''. Put the first few centimeters of the thermocouple onto some ice and watch the value on the scree drop. Adjust the calibration values until the egt reading is zero. === Testing EGT sensor === Then using a known temperature heat source (like boiling water) to check that the egt value is correct across a wide range. == Connecting Knock Sensor (Optional) == Although VEMS will work with a variety of knock sensors the ones that have been tried and tested are the Bosch === Configuring Knock Sensor === The first step is to calculate your engine's theoretical knock frequency. === Testing Knock Sensor === == Connecting Additional Sensors == There are some pins available to monitor additional sensors ---- = Step 3 - Connecting Output Components = '''NOTE: VEMS acts as a switch between the Component (injector, relay, ignition coil) and ground. VEMS does not provide the power to these components.''' == Connecting ignition components == '''Single coil''' In some instances you will want to keep the distributor, in this case VEMS can be configured to use the original coil as shown. * EC36-pin35 to Coil '-' terminal. http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingSingleCoil.png '''Coil pack''' Connecting a two coil (4 cylinder wasted spark) * EC36-pin35 to Coil 1 '-' terminal * EC36-pin33 to Coil 2 '-' terminal http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingCoilpack.png Additional coil packs, for applications such as 8 cylinder wasted spark, can be connected: * EC36-pin35 to Coil 1 '-' terminal * EC36-pin33 to Coil 2 '-' terminal * EC36-pin34 to Coil 3 '-' terminal * EC36-pin36 to Coil 4 '-' terminal http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingTwoCoilPacks.png '''Coil on plug (COP)''' Individual Coil connections are shown, the pins connect to the negative '-' side of the coil. * EC36-pin35 to Coil 1 * EC36-pin33 to Coil 2 * EC36-pin34 to Coil 3 * EC36-pin36 to Coil 4 * EC36-pin11 to Coil 5 * EC36-pin12 to Coil 6 * EC36-pin24 to Coil 7 * EC36-pin10 to Coil 8 There are two types of coil on plug (COP) passive and active. Passive COPs are essentially just the standard type of coil of the type shown above, but with one coil per plug. These are driven by a high current +12v supply as supplied by VEMS ignition drivers. More modern cars have an active COP, where the plug's ignition is controlled by a +5v signal. VEMS will need to be ordered specifically for this type of COP. http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingCoilOnPlug.png === Configuring Ignition === In the 'settings' -> 'Priming, Cranking, Afterstart' window in megatune you find a field called 'Crank Advance(deg)' set that to 0 for now. That will make it easier to set the base timing. Now make an easy to see mark at #1 TDC on the pulley and strope the engine when cranking. In the 'Settings' -> 'Trigger settings' window in megatune you find a field called 'TDC after the trigger(deg)' Change the value in that field until the timing light show that you have 0 deg timing when cranking. If you need to set more then around 75 - 80 degrees in that window you should increment the 'Trigger tooth' field in the same window and try again. Each increment will lower the 'TDC after the trigger(deg)' with six degrees. After you are satisfied with the settings you set the 'Crank Advance(deg)' to 10-15 degrees. You will need to experiment with the advance, this is part of the tuning process. You may find that a level that acceptable for cold start causes problems when the engine is warm. === Wasted Spark COPs === In most OEM applications COPs are fired sequentially, but in cases where no cam sync is present you can setup VEMS to drive the COPs for wasted spark. For this you will need specifically configured firmware, with this installed the coils can be fired in pairs. ---- == Connecting fuel injectors == VEMS can control anything from 1 to 8 fuel injectors individually, although it's also possible to control upto 16 injectors grouped in twos, although you will need to bare in mind that the grouping of the injectors will change the impedence that VEMS 'sees' so you may have to setup the system for low impedence injectors, details of which are found in the section ''Configuring Injector Impedence''. '''IT IS ESSENTIAL that EC36-pin23 is connected to the Injector's common power supply''' (see diagram), EC36-pin23 controls the voltage spikes that the injectors produce when they close (flyback), failure to connect the flyback pin will fry your VEMS. * EC36-pin7 to Injector1 * EC36-pin19 to Injector2 * EC36-pin8 to Injector3 * EC36-pin20 to Injector4 * EC36-pin9 to Injector5 * EC36-pin18 to Injector6 * EC36-pin6 to Injector7 * EC36-pin17 to Injector8 This shows the typical installation for a 4 cylinder application. http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingInjectors.png To 8 injectors are wired as shown here. http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingInjectors8.png And to pair injectors in parallel. http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingInjectorPairs.png The injector common + signal is connected with a 10A fuse to a switched +12V supply. NOTE the flyback connection is after the fuse. == Configuring VEMS for your Injectors == Injector configuration is handled by the screens Settings->Injector Settings and Settings->Injector Outputs http://vems.hu/www.vems.co.uk/VEMSUserManual/InjectorSettings.png http://vems.hu/www.vems.co.uk/VEMSUserManual/InjectorOutputs.png === Configuring Injector Sequence === For the purpose if explaination we'll use the example of a four cylinder engine that fires 1-3-4-2. Injectors are controlled using a Binary Mask with the following pattern: * Injector 1 = 1 * Injector 2 = 2 * Injector 3 = 4 * Injector 4 = 8 * Injector 5 = 16 ... * Injector 8 = 128 ''Batch fire'' To fire all injectors at the same time the binary pattern will be 1+2+4+8 = 15 So in Settings->Injector Outputs you will set: * 0 to ''15'' And in Settings->Injector Settings set: * Divider to ''1'' * Alternate banks from h[0] to ''0 Only'' ''Fully Sequential'' Firstly we need to identify the order of injection, in this case we want to fire in the sequence 4-2-1-3 as 4 will be on its inlet cycle as 1 will be on its combustion stroke. You will need to set the config.txt entry "alternate" to 03, which will cycle through the first 4 entries STARTING from the furthest right first, which in this case will be the forth number. So you must transpose the firing order to 3-1-2-4. Remembering the binary pattern above, in Settings->Injector Outputs you will set: * 0 to ''4'' * 1 to ''1'' * 2 to ''2'' * 3 to ''8'' And in Settings->Injector Settings set: * Divider to ''1'' * Alternate banks from h[0] to ''3..0'' It is possible to combine groups of injectors using the binary mask and to alternate the group firing using the Alternate banks and Divider settings. === Configuring Injector Flow === Open MegaTune and select the Basic Settings item from the Settings menu. We will need to calculate the value Req Fuel(ms) to suit the injectors we're using. http://www.ubernugen.com/vems/mt04.jpg Basic req_fuel calculation: <code> req_fuel = 6.49 * (D / N / I) I injector flowrate (cc/min) D engine displacement (cc) N number of injectors (eg. 4 for a 4 cyl port injection) </code> This is a simplified equation, if you are interested in the reasoning behind it you can read more here: http://www.vems.hu/wiki/index.php?page=GenBoard%2FManual%2FConfig%2FInjectorOpening '''Examples''' <code> 850cc injectors on a 2litre engine 6.49 * (1998/4/850) = 3.81mS </code> So the required fuel value will be entered as '''3.8''' <code> 280cc Injectors on a 1.6litre engine 6.49 * (1597/4/280) = 9.25mS </code> So the required fuel value will be entered as '''9.3''' === Configuring Injector Impedence === High Impedance (HighZ) In here, we write some stuff Low Impedance (LowZ) Here we do some PWM calcs. http://vems.hu/www.vems.co.uk/VEMSUserManual/InjectorGraph.png ---- = Connecting the fuel pump = The fuel pump is controlled via a mechanical relay. * EC36-pin15 to relay coil http://vems.hu/www.vems.co.uk/VEMSUserManual/ConnectingFuelPump.png == Idle Air Controller (IAC) == An Idle Air Controller (IAC) is used on most fuel injected engines to provide a method of controling the engine's idle speed. When the car is warming up or an additional load is put on the idling engine such as the additional current of an electical fan or air conditioning compressor it is necessary to raise the engine's idle speed to stop it from stalling. '''IAC Types''' There are a number of different idle speed controllers: Wax is the simplest and most common on Japanese cars and are not controllable by the ECU in that they use a wax filled piston which opens the throttle slightly when cold and closes it when the heat causes the wax to expand. Solanoid IACs use a single coil to open or close a valve in the inlet (in some cases to actually move the throttle plate). The simplest can be either opened or closed and will cause small increase in idle speed. More sophisticated types can be pulsed to provide a variable increase in RPM. Multicoil and Stepper motor IACs alow a much more complex level of control, in its simplest form it will have two coils to open and close the idle valve. '''Choosing the correct IAC connection''' Single coil types are relatively simple to connect, the only thing you need to know is the resistance of the IAC's coil by measuring it with a DVM. Once you have the resistance value use Ohms law to calculate it's current load. I=V/R. Examples: The IAC coil for a Nissan 200SX is measured at ~11 ohms a voltage of 13.8V would mean a current of ~1.26A (13.8/11) which means that a spare high current port (EC36-pins6, 9, 17 or 18) would need to be used. [insert HighCurrentIAC.png picture here] The Toyota "Idle Up Valve" found on the early 4A engines has a solanoid coil with a resistance of ~44ohms, which gives a current of 313mA(13.8/44). As this is less than the maximum 350mA value for EC36-pin3 (Fast Idle) it would be possible to connect it, but this is only advisable if you are using all the other high current pins. In all other cases its advisable to use one of the spare pins. [insert LowCurrentIAC.png picture here]
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