OMEX OMEM200 Manuel utilisateur

OMEM200 Tuning Manual 3v10

Tuning Manual

OMEM200

www.omextechnology.com

200 Series ECU

OMEM200 Tuning Manual 3v10

1Introduction.................................................................................................................4

1.1 What this manual covers......................................................................................................................4

1.2 Notation Used in This Manual ..............................................................................................................4

2Software ......................................................................................................................5

3Sensor Setup ..............................................................................................................6

3.1 Throttle Position Sensor.......................................................................................................................6

3.2 MAP Sensor for Engine Load...............................................................................................................6

3.3 Coolant Temperature sensor................................................................................................................7

3.4 Air Temperature sensor........................................................................................................................8

3.5 Crank Sensor........................................................................................................................................9

3.6 Trigger Wheel.......................................................................................................................................9

3.7 Ignition Timing Alignment...................................................................................................................11

4Map Axes...................................................................................................................12

4.1 Engine Speed.....................................................................................................................................12

4.2 Engine Load .......................................................................................................................................12

5Rev Limit ...................................................................................................................13

6Engine Start Condition.............................................................................................14

7Idle .............................................................................................................................15

8Conditions Corrections............................................................................................17

8.1 Air Temperature..................................................................................................................................17

8.2 Coolant Temperature..........................................................................................................................17

9Dwell Control.............................................................................................................18

10 Dashboard.................................................................................................................19

10.1 Tacho..................................................................................................................................................19

10.2 Shift Light............................................................................................................................................19

OMEM200 Tuning Manual 3v10

11 Password .................................................................................................................. 20

OMEM200 Tuning Manual 3v10

Thank you for choosing Omex Engine Management. This manual is written to help the user through

the specifics of tuning the OMEM200 ECU. It is essential that the user reads all of the Omex

manuals before attempting to install the system and before attempting to start the engine.

Incorrect use of the Omex system could potentially lead to damage to the engine and personal

injury. If you have any doubts about fitting these parts or using the software then please contact

Omex for help.

As the system is computer based, technical support is given on the assumption that the user is able

to perform simple Windows based operations. The user will also need access to email as Omex will

nearly always require a copy of the calibration in the ECU to give support.

Omex may not be held responsible for damage caused through following these instructions,

technical, or editorial errors or omissions. If you have any doubts about fitting these parts or using

the software then please contact Omex for help.

1.1 What this manual covers

This manual covers the tuning of your Omex 200 ECU. Installation of the ECU and software use are

in-part covered, but there are separate manuals available that cover these topics in more depth.

1.2 Notation Used in This Manual

Menu commands are signified in bold type with a pipe symbol |between each level of the menu.

For example, File | Open indicates that you should click on the Open option in the File menu.

1 Introduction

OMEM200 Tuning Manual 3v10

Installing the software

Run SetupMAP4000.x.xx.xx.exe and follow the onscreen instructions.

Connection port

The ECU requires an RS232 serial connection. Desktop PCs and older laptops will have 9pin D

shaped ports on them marked COM for this type of communication. If you have this port then this is

the best to use for communication with the ECU. If your PC does not have one of these ports then

you will need to use an adapter. We suggest using the USB to RS232 adapter from ‘ATEN’ as the

software has been specifically designed for this adapter.

Connecting to the ECU

Ensure that if you are using an adapter, the drivers software from the adapter manufacturer has

been installed.

Join the data lead between the ECU and the PC

Open MAP4000 from the ‘Start bar’

ECU | Connection Setup and select your port from the list

ECU | Connect

Ignition ON (do not crank the engine)

The ‘Receiving Calibration’ bar will start moving across. When completed, you are connected to

the ECU.

Sending the startup calibration to the ECU

It is not possible to start a new calibration from File | New. Please contact Omex for a

suitable start-up calibration.

Save the start-up calibration from the start-up disk or email to the hard-drive in the location

Documents\OMEX\MAP4000\Calibrations. (note that this folder is only created when MAP4000

is opened for the first time so you must have opened MAP4000 on this PC before)

Connect to the ECU as described in the above section.

ECU | Send new calibration

Ignition ON (do not crank the engine)

Select your start-up calibration and press ‘open’

When the calibration has been sent to the ECU cycle ignition power OFF / ON

2 Software

OMEM200 Tuning Manual 3v10

3.1 Throttle Position Sensor

The parameter TPS raw gives the raw number output of the sensor which is scaled by options TPS

min and TPS max to give a throttle that works between 0 and 100%. To calibrate;

A live reading is shown for TPS raw. TPS raw will be between 0 and 255. The throttle position

sensor can often be rotated by the user. If so, the position should be set so that the sensor

never reaches 0 or 255 during its closed throttle to open throttle movement. It is preferable to

have the sensor set so that the values do not go close to either extreme. Typically a value of

approximately 20 at the idle position will give an acceptable value at WOT (wide open throttle).

The number for TPS raw at WOT needs to have 1 added to it, then be inputted to the options

box as TPS max (i.e. if TPS Raw is 220, then input 221). The number for TPS raw at the idle

position needs inputting to the options box as TPS min.

The Autozero options allow the ECU to automatically re-learn the idle position of the throttle sensor

every time the ECU is turned on. 0 disables this feature.

3.2 MAP Sensor for Engine Load

If you are using MAP for engine load sensing then set MAP for Load ON.

MAP min and MAP max should be 0and 255. Do not change these unless instructed to by Omex.

MAP Cal is the time over which the ECU averages the MAP sensor input. Measured in internal

units. Typically 12.

As standard, the ignition map will show load values of 0-100KPa. This is not KPa, this is simply 0-

100% of the range of the sensor. It is possible to tell the ECU what range the sensor has so that you

can read the true KPa value on the maps.

Load Scalar

The multiple of 1 that describes the theoretical 0-5V full scale of the

sensor.

Load offset

Most MAP sensors do not have 0V at 0KPa, they have a slight offset.

This option describes the offset.

Omex have the values for the sensors sold by Omex. If you want to calibrate your own sensor then

either find the voltage output information (total scale, and offset) from the manufacturer, or follow

this procedure;

3 Sensor Setup

OMEM200 Tuning Manual 3v10

Select a suitable start point for Load Scalar to suit your sensor e.g. for a nominally 2bar sensor,

enter 2.

Note the current value for MAP as Load.

Change the pressure at the sensor by a known amount using a vacuum pump.

Ignoring the absolute value, adjust Load Scalar until the correct change in value is shown by

MAP as Load to suit that pressure change e.g. if you have reduced the pressure by 50kPa,

then adjust Load Scalar until MAP as Load shows 50kPa less than it did before the pressure

change was made.

Remove the pressure change and try the above again. As this is an iterative procedure you may

need to do it several times before the correct change is shown on the ECU.

Remove any pressure changes from the sensor and adjust Load offset until MAP as Load

shows the current barometric air pressure.

3.3 Coolant Temperature sensor

The coolant temperature sensor used by the Omex ECU is a resistive sensor. The raw output of this

sensor is calibrated in the ECU to give the information in a more usable form, oC. Sensors are

calibrated in the Coolant Temp Sensor table. The values for many sensors are known but you may

need to calibrate your sensors.

To calibrate a sensor;

Place the sensor and a thermometer in a kettle or pan of water

The ECU will highlight the current raw input value from the sensor along the upper line of the

table. Below this input value, enter the current thermometer reading in degrees centigrade.

Heat the water. As the temperature increases, repeat the temperature readings.

When the water is fully heated, repeat the process as the water cools

OMEM200 Tuning Manual 3v10

Using the graph view, smooth the curve to remove any mistakes, and extrapolate to

unobtainable temperatures.

Coolant Fail Low and Hi are the failure points of the sensor and should be set to just within the

reading limits of the sensor.

Example- If the lowest temperature in the sensor table is –25 then Coolant Fail Low should be set

1 higher at –24. If the highest temperature in the sensor table is 125 then Coolant Fail Hi should be

set 1 lower to 124. Coolant Temp Default is the temperature to which the input defaults if the

sensor goes into failure.

3.4 Air Temperature sensor

The air temperature sensor used by the Omex ECU is a resistive sensor. The raw output of this

sensor is calibrated in the ECU to give the information in a more usable form, oC. Sensors are

calibrated in the Air Temp Sensor table. The values for many sensors are known but you may

need to calibrate your sensors.

To calibrate your sensor, see the calibration of the coolant temperature sensor.

Air Temp Fail Low and Hi are the failure points of the sensor and should be set to just within the

reading limits of the sensor.

Example- If the lowest temperature in the sensor table is –25 then Air Temp Fail Low should be set

1 higher at –24. If the highest temperature in the sensor table is 125 then Air Temp Fail Hi should

be set 1 lower to 124. Air Temp Default is the temperature to which the input defaults if the sensor

goes into failure.

OMEM200 Tuning Manual 3v10

3.5 Crank Sensor

The crank sensor input can be from either a Magnetic Variable Reluctance (MVR) sensor or a Hall

Effect sensor. The two types of sensor require different hardware on the ECU board, so are selected

by physical jumpers. This is covered in the installation manual.

Software changes must be made to suit the sensor type.

MVR

The crank sensor high and low gain settings allow a user definable change point for high sensitivity

to allow for low magnetic crank sensor outputs at low engine speeds. Typically the values are just

above idle speed.

Magnetic sensors can use either the rising or falling edge of the generated waveform. If the edge is

incorrect then the engine will misfire at some point in the engine speed range. There is also the

possibility that if the edge is incorrect on a magnetic sensor of the ignition timing on the engine

deviating from the ignition timing calculated by the ECU as the engine speed changes. To find the

correct edge either see which edge does / does not produce ignition timing changes, or using an

oscilloscope to look at the waveform. If the signal falls through the missing tooth section use Crank

Rising Edge, and if it rises through the missing tooth section use Crank Falling Edge.

Hall Effect

Hall effect sensors require values of 0 for the high and low gain settings as their output is the same

amplitude regardless of engine speed.

Hall Effect sensors can use either the rising or falling edge, though typically the falling edge would

be used.

3.6 Trigger Wheel

The pattern of teeth on the crank or flywheel that the crank sensor faces is known as a trigger

wheel. The pattern is evenly spaced teeth with missing or extra teeth as reference points. As

different manufacturers use different trigger patterns, the ECU is programmable to suit. The

information required in the ECU for many of the popular patterns is already known, some of which

are listed below. If you have a different pattern on your engine please contact Omex for advice.

It is very easy to make an engine run, but not run properly by incorrectly entering these

options and tables. If possible please contact Omex for a calibration aspect or email an

existing calibration to Omex to be changed to a different trigger pattern.

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