Aim MYCHRON4 660 User manual

USER MANUAL

MyChron4 660
User Manual
Release 1.03
INDEX
1 – HOW TO INSTALL MYCHRON4 660 .............................................................. 3
1.1 – How to install and replace the batteries............................................... 3
1.2 – How to install MyChron4 660 on Junior Dragsters ............................. 5
1.3 – How to install the RPM wire................................................................... 6
1.4 – How to install the EGT thermocouple................................................... 7
1.5 – How to install the cylinder head thermocouple................................... 9
1.6 – How to install the Speed sensor ......................................................... 10
1.7 – How to connect cables to MyChron4 660........................................... 13
2 – HOW TO USE MYCHRON4 660 .................................................................... 14
2.1 – The Keyboard........................................................................................ 14
2.2 – How to switch ON/OFF the gauge....................................................... 15
2.3 – Configuration functions ....................................................................... 16
2.3.1 – Configuration wizard....................................................................... 16
2.4 – The Display............................................................................................ 26
2.5 – Post Run Review................................................................................... 27
3 – GPS MODULE AND MYCHRON4 660 .......................................................... 31
3.1 - How to connect GPS MODULE ............................................................ 31
Connection with internal power .................................................................. 31
Connection with external power ................................................................. 32
3.2 - How to install GPS module................................................................... 32
3.3 - Configuration Wizard ............................................................................ 33
3.4 - MyChron4 660 Data visualization ........................................................ 34
3.5 - MyChron4 660 Datakey for data download......................................... 35
3.6 GPS Module with QMan .......................................................................... 36
4 – MYCHRON4 660 AND THE PC ..................................................................... 38
4.1 – Downloading data with MyChron4 660............................................... 38
4.2 – How to use QMAn ................................................................................. 39
4.3 – QMAn installation ................................................................................. 40
4.3.1 – Installation under Microsoft Windows XP™ ................................... 40
4.3.2 – Troubleshooting.............................................................................. 46
4.3.4 – Installation under Microsoft Vista™ ................................................ 47
4.3.5 – Troubleshooting.............................................................................. 54

MyChron4 660
User Manual
Release 1.03
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4.4 – QMAn Data Analysis............................................................................. 55
4.4.1 – Test/Run manager.......................................................................... 56
4.4.2 – Analysis View.................................................................................. 60
4.4.3 – Time Plot......................................................................................... 62
4.3.4 – Histogram ....................................................................................... 69
4.3.5 – XY Plot............................................................................................ 71
4.3.6 – Channel info.................................................................................... 73
4.3.7 – How to set the time slip info............................................................ 74
4.3.8 – How to set weather station data ..................................................... 75
4.3.9 – Test Loaded View........................................................................... 76
4.3.10 – Run Info ........................................................................................ 78
4.3.11 – Time Slip....................................................................................... 79
4.3.12 – Tachometer................................................................................... 80
4.3.13 – Weather ........................................................................................ 81
4.3.14 – How to send the test file via E-mail .............................................. 81
4.5 - Maintenance........................................................................................... 82
4.5.1– How to upgrade the firmware .......................................................... 82
APPENDIX A: TECHNICAL CHARACTERISTICS ............................................. 84

MyChron4 660
User Manual
Release 1.03
www.aim-sportline.com 3
1 – How to install MyChron4 660
Before installing MyChron4 660, please read these installation instructions
carefully. It is very important that your MyChron4 660 is correctly installed in
order to capture consistent and accurate data. Incorrect installation may result in
system malfunction.
Now you may start installation of MyChron4 660 on your Junior Dragster.
It is recommended to follow these instructions in order to preserve your
instrument and to capture consistent and accurate data.
1.1 – How to install and replace the batteries
Your MyChron4 660 is powered by one 9V alkaline battery.
When the internal battery requires replacement, a battery indicator will blink in the
lower left corner of the display:
If you do not replace the battery and keep on running, the system might shut
down during a test. The following screen (above right) will appear a few seconds
before the gauge shuts off .

MyChron4 660
User Manual
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To change battery, remove the two screws on the back of the display unit. A 9V
battery will be connected to a two-wire power lead. Simply disconnect the battery
from the lead and replace with a new battery.
Do not over-tighten the screws when mounting the battery cover to the back
of the display unit.
open here to
change the
battery

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User Manual
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1.2 – How to install MyChron4 660 on Junior Dragsters
One of the main uses of the gauge is to allow the mechanics to set up engine’s
carburetion in the staging area immediately before the race start.
To make this easy, it is suggested to install the gauge in a place where the
mechanics may see the display while working on the engine.
Behind the body cell on the vertical metal bulkhead which separates the racer’s
seat from the engine is a commonly used location. More specifically, as shown in
the following drawing, AIM recommends all MyChron4 660 users to install the
gauge under the engine’s ON/OFF switch.
The gauge has to be mounted on a self-made bracket as shown in figure above.
The bracket has to be made of aluminium or steel, and its thickness must be
0.1 “(2.5 mm) or more in order to have a high stiffness and resist vibration when
the engine is turned on.
Firmly fix the bracket to the vertical metal bulkhead and then fix your MyChron4
660 to the bracket.
Do not over-tighten the 8 mm mounting nut. Over-tightening the nut may cause
damage to the display unit casing.

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1.3 – How to install the RPM wire
The RPM wire has to be connected to the ON/OFF switch (kill switch). This switch
is usually a 2-poles switch (some switches are a single pole, but most are two):
one pole is COIL, the other one is RPM.
The RPM wire should be going to the coil side of the kill switch. Running it to the
grounded side of the switch causes the RPM signal to drop in and out and
sometimes not to work at all.
Because the ON/OFF switch is mounted on the opposite side of the bulkhead with
respect to the gauge, it is necessary to drill a 0.2” (5 mm) hole inside the
bulkhead.
Remember to insert the rubber wire-holder in order to protect the RPM wire
against tears and cuts.
While connecting the RPM wire to your MyChron4 660, please keep the
cable as far as possible from the temperature ones. If the RPM and
temperature wires are wrapped together, the temperature channels might be
very noisy.

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User Manual
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1.4 – How to install the EGT thermocouple
The Exhaust Gas Thermocouple (EGT) has to be installed inside the exhaust
header pipe at a distance of approximately 5.9“ (150 mm) from the exhaust port.
The figure below shows the proper way to install the EGT thermocouple and the
installation wrapper.
It is recommended to insert the sensor between 25% and 50% inside the exhaust
gas header.
To correctly install the EGT thermocouple, please follow these instructions:
1. Make a 0.2” (5 mm) hole inside the exhaust header
2. Fix the metal wrapper to the exhaust header pipe in the hole you have
drilled. It is reminded that the pipe’s hole and the wrapper’s threaded nut
must be coaxial
3. Screw the EGT thermocouple in the wrapper’s nut and firmly fix it. Plug
the thermocouple’s male Mignon connector to the EGT input wire of the
“2 temperatures split cable”.

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The EGT thermocouple may also be installed using a steel adapter which has to
be welded to the exhaust header pipe, as described in the following drawing and
explained below.
Make a 0.4” (10 mm) hole inside the exhaust header
1. Weld the EGT adapter inside the hole
2. Screw the EGT thermocouple inside the EGT adapter
3. Plug the thermocouple’s male Mignon connector to the EGT input wire of
the “2 temperatures split cable”.
1
3
2
Weld

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User Manual
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1.5 – How to install the cylinder head thermocouple
When using a Cylinder Head Thermocouple (CHT) sensor, always remove the
spark plug washer before inserting the spark plug into the sensor.
When tightening and loosening the spark plug, minimise movement of the sensor
to avoid damage.
The figure below shows how to correctly install the CHT sensor.
Once the sensor has been correctly installed, plug the thermocouple’s male
Mignon connector to the CHT input wire of the “2 temperatures split cable”.