OPERATING INSTRUCTIONS MODEL DT-34K4
When turned on, your instrument will begin a 10 second display test. At the end of the test, your instrument’s serial number will be displayed. To bypass this test press theMODE button.
SETTING FUNCTION LIMITS
Before using your DT-34K4, be sure to set the operating limits for each sensor. The instrument will not allow limits to be set while the engine is running. This is to prevent possible damage to your instrument.
Limits allow the instrument to give you a visual warning if any of the inputs exceed their limit. Limits should be set at levels that allow you to react to the visual warning before engine damage occurs. You will also need to set a calibration number so the instrument can display the correct RPM.
To set the limits, the instrument must be turned on and the kart’s engine turned off. Press and hold theMAX and MEM buttons simultaneously until a display flashes. This will put the instrument into the Set Limits mode of operation, which is indicated by a flashing display. To increase the limit, press the MAX button. To decrease the limit, press the MEM button. To increase or decrease the limit by a large amount, press and hold either the MAX or the MEM button until the approximate limit value is reached. When finished setting the first limit, press the MODE button to set the next limit. Repeat the above procedure to set the remaining limits. Set limits at levels high enough for normal operation, but not so high that engine damage can occur before you can respond to a problem.
The tach limit requires the setting of two separate parameters. The first is the maximum RPM for safe engine operation. The second number is for tach calibration. In order to display the correct RPM for different engine types, the instrument divides the tach input signal by the tach calibration number. This number can be between .5 and 31. Select this number so that it will provide the correct display for your application using theMAX and MEM buttons.
The most frequently used numbers are:
.5 - for some single cylinder 4 cycle motors
1 - for single cylinder 2 cycle and some 4 cycle motors
2 - for 2 cylinder 2 cycle and 4 cylinder 4 cycle motors
If you are unsure of the exact tach calibration number for your engine, experiment. If your calibration number is currently set at 1 and the RPM displayed is double what it should be, set the calibration number to 2. Alternately, if the RPM displayed is half of the correct value, decrease the calibration number to half of the current number.
To save the current limits and exit the Set Limits mode, press theSTORE switch.
EXHAUST GAS TEMPERATURE
Exhaust gas temperature (EGT) is used primarily for adjusting the air/fuel ratio. Because of its quick response, the effects of carburetor adjustments are seen immediately. Fuel system and carburetor problems can often be spotted quickly enough to prevent engine damage.
Exhaust gas temperatures typically run between 1100° F and 1350° F. The EGT on a properly tuned engine will increase rapidly as the throttle is opened and as the load on the engine is increased. At full throttle and full load the EGT will stabilize at a temperature dependent on the air/fuel ratio. Both a "too lean" or a "too rich" condition will be indicated by a lower than peak temperature. The "too lean" condition can damage your engine. An increase in coolant temperature or cylinder head temperature is usually an indication of this. The best way to determine what temperature is normal for your motor is to tune for good plug or piston color and then observe the temperature at various throttle settings.
CYLINDER HEAD TEMPERATURE
Cylinder head temperatures (CHT) usually run in the 300º F to 475º F range. The best way to determine the correct temperature for your particular motor is to tune for proper plug or piston color and then observe what the head temperature is for various throttle settings and atmospheric conditions.
Temperatures of 450º F or over will damage the standard CHT sensor. If your motor runs at cylinder head temperatures over 450º F your instrument should have an exhaust gas temperature function, which can use a thermocouple CHT sensor (part number TT-102). This sensor can be used without damage at higher temperatures, however it is less accurate and the cable is more prone to break from bending.
The tach displays RPM in thousands of RPM.
For example, if your display shows 9.50, your RPM is 9500 RPM.
The speedometer is your last limit to set in Set Limits mode. Simply enter the number that you determined in the Speedometer Calibration section of your installation instructions.
TheSTORE button or the optional REMOTE STORE switch can be pressed up to three different times to store the current values of each function into memory. The displays and the optional WARNING INDICATOR LIGHT will flash to indicate a successful store of information. After three sets of numbers are stored, additional attempts to store information will be ignored.
In addition, the instrument automatically stores a maximum value for each sensor during the current recording period.
TheMEM button is used to recall the numbers stored in memory. To recall the first set of stored numbers, press and release the MEM button. The contents of the first memory will be displayed and the left decimal point in the lower left display will flash. Press MEM again to display the second set of information. The middle decimal point will flash in the lower left window. A third press of MEM will bring up the last set of numbers and cause the right decimal point to flash. Press MEM once more to return to normal display mode.
TheMAX button is used to display the maximum values recorded for each input. Recording of these values takes place automatically and requires no input from the user. To display maximums, hold down the MAX button. These values will be displayed until the button is released.
DISPLAY OF OVER LIMIT/OVER RANGE
When conditions exceed the set limits, the display where the overlimit condition is occurring will flash.
When conditions exceed the range of the instrument, the display will show three bars at the top of the display where the over range condition occurs. This condition can also be caused by a bad or disconnected sensor.
If the instrument encounters excessive electrical interference it will display three vertical decimal points in the tach display. This indicates that the stored data could be invalid. It can also indicate an incorrect instrument or sensor installation.
Severe electrical interference can cause the limits and calibration to reprogram themselves. If your instrument is doing strange things, put it in the Set Limits mode and check to see that the limits and calibration are still where you set them.
There are three optional features that can be added to your DT-34K4. To have any of these options added to your instrument, send it to the address at the end of these instructions.
When mounted to your steering wheel, theREMOTE STORE switch allows you to store three sets of numbers while keeping your hands on your wheel.
WARNING INDICATOR LIGHT
The optionalWARNING INDICATOR LIGHT flashes constantly when any of the set limits are exceeded. It will stop flashing when the conditions fall below the set limits. The WARNING INDICATOR LIGHT will also flash once when either STORE switch is pressed. Memory is full if the switch is pressed and the WARNING INDICATOR LIGHT does not flash.
TheBACKLIGHT lights the displays for use at night. To turn it on or off, press and hold the MODE and MAX RECALL buttons simultaneously. The BACKLIGHT is an optional feature; it will only work if installed.
An instrument not using a backlight will run for about 150 hours on a fresh set of AA alkaline batteries. With the backlight on, the battery life will be approximately 50 hours. Heavy duty batteries last about half as long as alkaline batteries. The percentage of battery life remaining will alternate in the lower window by holding down theMAX button. The instrument will also display "lo b" in the lower window to warn you of a low battery condition. At this time the temperature functions will become inaccurate, but the tach will display accurate information for approximately one hour.
The unit will turn itself off automatically after 10 minutes if no tach input is detected or buttons are pressed. You can also turn the instrument off manually by pressing theOFF and the MODE buttons at the same time.
Any stored data will be lost when the power is turned off. View all stored information before turning the instrument off.
If you have any questions about the operation of your instrument, please call. One of our technicians will be happy to help you.
Your instrument is warranted to be free from factory defects and electronic failure for one year from the date of purchase. Physical damage during normal usage is not covered under the warranty. Be sure to fill out and return your warranty card for our records. If we do not have a card on file for your instrument, you will be charged for repairs unless you can provide us with proof of purchase date.
When returning an instrument for repair, enclose a note indicating your return address, phone number and a detailed description of the problem. Send your instrument and sensors so that we can check the complete system.
Send repairs to:
8102 N. Freya St.
Spokane, WA 99217
Phone: (509) 467-3128 Fax: (509) 467-2952
TS Racing, Inc.
123 West Seminole Ave. Bushnell, Fl 33513 USA
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