MembersPage/PhatBob/UserGuide (2015-01-01 07:00:00)

VEMS v3.3 installation instructions

These instructions are written for a typical Windows Installation.

The EC36 is the larger Econoseal 36pin plug, and EC18 is the smaller Econoseal plug.

Step One - Connecting Power

The first thing to do is to get a power supply upto the

NOTE: Signal Ground pin has many connections (CAS, TPS, IAT, CLT ...) make provision for this in your wiring loom.

The 3 Power Grounds

These (at least the first 3) must be connected to BATTERY- (preferrably with 3..4 separate wires that meet as close to the BATTERY- as possible). Failure to do this may result in damage to the VEMS module.

ConnectingPower.png

Make sure the EC36-pin5 connection does not break during operation. This is the reason for using separate wires: even if 1..2 breaks for some reason (eg. a screw comes loose), at least 2 remains connected.

Before you put any power through the unit use a multimeter to ensure that pins are wired correctly. There is little point in connecting power until the serial connector or LCD screen has been connected.

Step Two - Connecting Serial Port

To allow the connection of the VEMS unit to your PC a serial port plug must be connected as follows.

ConnectingSerialPort.png

Step ??? - Connecting the LCD

GenBoard/BuildProcedures/LCDconnect

Step Three - Testing the unit

Install required software (Currently mt-r023.zip)

Connect serial lead to unit and PC

Configure MegaTune for the serial port

Connect power to VEMS

Watch system come alive!

Step Four - Connecting the primary trigger (CAS)

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.

ConnectingPrimaryTrigger.png

Sheilding should be grounded to engine block close to the VR Sensor

Step Five 'A' - Connecting the secondary sensor

With the same considerations with the primary trigger regarding electrical noise.

ConnectingSecondaryTrigger.png

Step Five - Configuring the system to suit the sensor

[insert config file fragment]

Step Six - Testing the crank sensor

Use MegaTune. Spin the engine. Watch the rpm value.

What to do if it doesn't work.

Step Seven - Connecting the Water Temp. (CLT) Sensor

Step Eight - Connecting the Air Temp. (IAT) Sensor

Step Nine - Configuring the temperature sensors

Use EasyTherm to build tables.

Upload tables.

Step Ten - 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.

Step Eleven - Connecting the Throttle Position Sensor (TPS)

Step Twelve - Configuring and testing the TPS

MegaTune TPS setup. Steps and screen shots.

Step Thirteen (Optional) - Connecting WBO2 Sensor

Before we plug the wide band in we need to do some tests and calibration, the first is 'Pump Zero DC', 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

Ideally the value should be between 0x64 to 0x66 and the values make a big difference, for example at 0x65 I measured 0.10v

changing to 0x64 resulted in a reading of -0.17 and 0x66 took the reading up to 0.5v

Step Fourteen - Testing WB02 Sensor

Fresh air reading

Configure value to read fresh air O2 level

Step Fifteen (Optional) - Connecting EGT Sensor

Temp. compensated cable, blah blah blah.

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=40 # 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. Then using a known temperature heat source (like boiling water) to

Check that the egt value is correct across a wide range.

Example EGT Sensor


Flyback - EC36pin23 very important that EC36pin23 is connected directly (wihtout fuse in between) to all injectors (the injector common + signal).

The injector common + signal is connected with a 10A fuse to a switched +12V supply (often called node15).