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Computech Systems EGT Plus 4100 Series Manual

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Introduction
The Computech Systems EGT Plus is designed to monitor exhaust gas, liquid, tire and track temperatures, and engine RPM.
It has the capability of recording when maximums occur, as well as recording readings at the beginning and end of a run.
Installation – Mounting
It is recommended that double-stick foam tape or hook and loop fastener such as Velcro brand which is included, be used
to mount your Computech Systems EGT Plus.
Your Computech Systems EGT Plus may be installed anywhere that ignition noise is not a problem. Be sure to avoid close
proximity to ignition modules, coils, and spark plug wires. Direct exposure to the weather is also discouraged.
Obviously, you'll need to mount the unit where your temperature probe cables can reach, possibly through the use of special
thermocouple wire extensions. If you plan on recording RPM, using a record switch, or connecting to your transbrake, keep
in mind that you'll need to connect both the desired signal as well as a chassis (car battery) ground signal to the unit. Choose
your mounting location appropriately.
Operating Modes - Choose before wiring
Your Computech Systems EGT Plus may be operated in one of three modes. Before you complete your installation, it's
best if you select which mode you would like to use. If you're unsure, don't worry too much. It's fairly easy to re-wire
your Computech Systems EGT Plus for a different mode. Continuous mode, of course, may be used with any of the wiring
scenarios. Select from one of the following Computech Systems EGT Plus operating modes.
Continuous Mode
In continuous mode, your Computech Systems EGT Plus behaves like most other EGT monitors. It continually
monitors your EGT and RPM inputs, and continually takes note of the maximum reading.
For More Info Visit Computech.com
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Summary of Contents for Computech Systems EGT Plus 4100 Series

  • Page 1 Computech Systems EGT Plus. Your Computech Systems EGT Plus may be installed anywhere that ignition noise is not a problem. Be sure to avoid close proximity to ignition modules, coils, and spark plug wires. Direct exposure to the weather is also discouraged.

  • Page 2: Installation & Wiring

    Before a run, you must press and hold the “RESET” button. Once the LCD display indicates “Ready to Run…”, your Computech Systems EGT Plus is armed and ready to go. Whenever the transbrake is released, the unit will note the beginning readings and start watching for new maximums.
  • Page 3 (cleanliness) of the RPM pickup from the magneto ignition. Wiring your Computech Systems EGT Plus is simple. Note that EGT cables are made of special wire, and use special connectors. Substitutes are not acceptable. For best results with the other signals (RPM, Transbrake, Record Switch, Power, Ground), use 18 to 22 gauge (AWG) stranded wire.
  • Page 4 Plus. The best place to pick up the RPM signal is from the same wire that drives your tachometer. Otherwise, use the “Tach” output of your ignition system. If you do not have either of these available, contact Computech Systems technical support to get information about a tach output generator for your car.
  • Page 5 NOTE: If you did not receive the Magneto Adapter, then request one from Computech Systems via 800-870-8383 or www.computechracing.com. NOTE: The Magneto Adapter is actually simply a 100K resistor of size ½ Watt or larger. However , if you have a normal non-magneto type tachometer in your car already, being driven by a magneto tach adapter of some kind, such as the one from MSD, then this adapter is ALREADY doing the high voltage protection.
  • Page 6 WARNING: On some cars, if you use both the car battery and the internal 9V battery, then the 9V battery might later supply power to you ignition and prevent it from turning off. If this occurs, then REMOVE and DO NOT USE the internal 9V battery. To record using a record switch For using a record switch, both the record signal and a chassis (car battery) ground wire are required.

  • Page 7: Sensor Installation

    Sensor Installation Weld-In Style Sensor #4110: 1. Select the header tube in which you wish to mount the sensor. 2. Measure a spot 1-1/4 inches from the header flange. If more than one probe is to be mounted, it is important that all probes be located the same distance from the header flange.

  • Page 8: Initial Configuration

    This will allow the wire to absorb the vibration along the wire's length. Initial Configuration Before using your Computech Systems EGT Plus, a simple initial configuration is required. Press and hold the “POWER” button until you see the configuration menu option for number of cylinders. To advance to the next configuration menu option, simply press the “POWER”...

  • Page 9: Operation

    This configuration menu option will only appear if you’ve selected “Transbrake” mode. Enter the number of seconds for a typical run. It will be exactly this long after the transbrake is released that your Computech Systems EGT Plus makes a note of your end-of-run EGT and RPM readings. Don’t worry if your E.T. doesn’t match exactly. Near the end of your run, the EGT and RPM readings won’t be changing very rapidly.
  • Page 10 In order to change the configuration, the case must be opened up by removing the hook-and-loop fastener from the back of the unit and removing the screws. Doing this without first consulting Computech Systems is a violation of the warranty.
  • Page 11 Rules for avoiding ignition (radio frequency) interference Your Computech Systems EGT Plus has been specially engineered to be resistant to radio frequency interference generated by automotive ignition systems. Nevertheless, it’s a very good idea to follow some simple rules about installation and wiring.
  • Page 12 If you do suspect RF interference, please re-read the wiring advice below. Also, be sure to read below about what to do at the first and second sign of a problem. Wiring Advice 1. Always mount your Computech computer equipment on the OPPOSITE side of the firewall as the motor and ignition.
  • Page 13 At the first sign of an RF interference problem, please re-read the section above about wiring advice. Also, strongly consider using MSD brand 8.5mm ignition wires. Time and time again, these ignition wires have been proven the absolute best at eliminating such problems for not only Computech Systems computer equipment, but for other computer equipment as well.
  • Page 14 Magneto ignitions are the worst about RF interference. It’s also sometimes a problem with other high performance ignition systems. Your Computech Systems EGT Plus has been specially engineered to resist the far majority of these problems. Nevertheless, sometimes resistance needs to be taken a step further.