GT2 V E H I C L E P E R F O R M A N C O w n e r ’s M a n ua l E C O M P U T E R
WARNING Index The manufacturer is not responsible for any accidents, property damage, or injuries that occur while using the Performance Computer. One-button Operation Quick Start Guide Like your car’s speedometer, this device is no more than a measuring instrument, a tool that can be used to measure vehicle performance. Obey all traffic laws on the street. Drive responsibly, and use common sense.
Quick Start Guide Please read the entire manual to learn details of the many capabilities of your new Performance Computer. This page provides only a basic overview of the installation, features, and capabilities. Power-on LED INSTALLATION 1) Plug into lighter socket Plug the cord into the Performance Computer, and into your car’s lighter socket. The Performance Computer is always “On,” there is no on-off switch.
Installation Mounting Location Mount the unit on the windshield, centered between driver and passenger. The unit must be straight across the car. Do not angle the unit toward the driver! Unit must be mounted squarely in car Mount the unit on the windshield, centered between driver and passenger. The unit must be straight across the car.
How it works Specifications The Performance Computer measures the performance of your car by sensing acceleration forces. Accelerometer 2-axis, +2G range, high-resolution digital outputs. Processor Advanced RISC-based 8-bit microcontroller with 128KB Flash Program Memory, 4KB SRAM, 4KB EEPROM, integral 8-channel 10-bit A/D convertor. Throughput up to 14.75 MIPS at 14.75 MHz. Additional external 1MB flash memory for data storage.
G-METER OPTION 1: BAR GRAPHS G-METER OPTION 2: FRICTION CIRCLE Press and release the G-METER button as necessary to select “G-METER OPTION 1.” The car is accelerating at .45 G. This display shows straightforward bar graphs of G-Forces. The top line shows acceleration and braking forces; the bottom line shows cornering forces. The car is braking at .22 G. Typical Cornering G-Forces Below we list typical maximum cornering forces for different types of cars.
G-METER OPTION 3: PEAK HOLD Press and release the G-METER button as necessary to select “G-METER OPTION 3.” Showing a recent acceleration peak of .38G. This display shows the peaks in acceleration, braking, left cornering, and right cornering G-Forces, and “holds” those numbers on the screen for 4 seconds. Showing a recent braking peak of .48G. You can adjust the hold time using the Setup mode.
G-METER OPTION 7: RACEMONITOR .10 G-METER OPTION 8: RACEMONITOR .05 Press and release the G-METER button as necessary to select “G-METER OPTION 7.” The car is accelerating and turning left with a combined G-Force of .25G. This display shows only the combined vector forces (see the explanation in G-METER option 2: Friction Circle). Press and release the G-METER button as necessary to select “G-METER OPTION 8.” The car is accelerating and turning left with a combined G-Force of .25G.
Timed Runs Your Performance Computer’s intuitive “one-button” operation makes timing your car’s performance easy. 2: TIMER STOPS AUTOMATICALLY 3: REVIEWING RESULTS The Performance Computer automatically records all run data, and will continue taking data until any of the following occurs: After the run ends, the unit will display two alternating screens: 1: HOW TO START A TIMED RUN You start the process by pressing the TIMED RUN button.
4: REVIEWING DETAILED RUN RESULTS AN EXAMPLE OF RUN DATA The Performance Computer automatically records all run data during a timed run. To review the data after the run, press the UP and DOWN buttons. Here is an example of the data you can view after each timed run. 4 Each time you press the DOWN button, you will see another screen of data. The data for your 10 most recent runs is automatically kept in memory. You can review the data immediately after your run, or anytime later.
Measuring Horsepower For the performance computer to accurately measure your car’s horsepower, you must enter information about your vehicle’s weight, drivetrain loss, and aerodynamic qualities. To accurately measure engine horsepower, the following six setup items must be correct: HORSEPOWER SPEED MIN AND MAX ROLLING RESISTANCE This is a characteristic of the vehicle’s tires. For most passenger vehicles, the default of .013 is the proper choice. To enter Setup, hold the G-METER button.
Estimate your vehicle’s CDA 3 Calculate your vehicle’s CDA How to determine the CDA of your car: 2 There are three possible ways to determine the CDA of your car: • Find specifications for your car’s CDA • Estimate your car’s CDA • Calculate your car’s CDA using a coastdown test Use the following examples to estimate the CDA for your vehicle. You can determine the correct CDA number by using a “coastdown” test. Honda Insight .25 CD x 20.4 sq. ft. = 5.1 CDA • Corvette C5 .29 CD x 21.3 sq. ft.
Setup Mode The Setup mode lets you enter your car’s weight and make other selections to optimize horsepower measurement, and also customize the operation of other features. HOW TO ENTER THE SETUP MODE G-Meter and Timed Run accuracy For most cars, it is not necessary to change any Setup items for accurate G-Meter and Timed Run functions. 1 Hold the G-METER button.
pensions can change this setting for more accurate cornering G-Force measurements. For cars with very soft suspension, change to 6.0. For cars with soft suspension, change to 4.5. Default is 3.0 For cars with very stiff suspension, change to 2.5 For race cars, change to 1.5 DETAILS ON SETUP MODE ITEMS To enter the Setup Mode, hold the G-METER button. Then follow the on-screen instructions, which are: • To go to the next item, press the START button.
DETAILS ON SETUP MODE ITEMS (cont’d) 16 BRAKE TEST You must change this setting if you want your Performance Computer to perform brake tests. You can choose to include “60mph to zero” brake testing in timed runs. Default is Brake Test Off. 15 END TIMED RUN Most users won’t need to adjust this setting. You can choose to end timed runs automatically, or time each run for 30 seconds. Default is Automatic. To perform 60 to 0 brake tests, change this setting to “Brake Test Auto.
Optional accessories DETAILS ON SETUP MODE ITEMS (cont’d) 21 DATALOGGER Most users won’t need to adjust this setting. You can enable a special mode that allows saving a single 5 minute log of acceleration in memory, for download to your computer or Palm (you’ll need the optional software and cable). Here’s how it works. 19 TRIGGER Most users won’t need to adjust this setting. This sets the G-Force criteria to start timed runs. The default is .
Troubleshooting run at the drag strip, since changes in your position of only a few inches will significantly affect the drag strip times due to rollout. See additional troubleshooting tips, FAQ’s, and other information on our website, or email us at: • The two Setup mode items that affect Timed Run accuracy are “Rollout distance” and “Pitch Characteristics” (the way your car tilts back under acceleration). support@escortinc.
Warranty Service One Year Limited Warranty The manufacturer warrants your Performance Computer against all defects in materials and workmanship for a period of one (1) year from the date of the original purchase, subject to the following terms and conditions: The sole responsibility of the manufacturer under this Warranty is limited to either repair or, at the option of the manufacturer, replacement of the Performance Computer.
Passport G-Timer™ is designed in the USA. Printed in USA. Rev 2 Escort Incorporated 5440 West Chester Road West Chester, Ohio 45069 Sales 800-433-3487 Service 800-543-1608 www.gtimer.com ©2003 Escort Inc. Escort®, Passport® and G-Timer™ are trademarks of Escort Inc. Features, specifications and prices subject to change without notice.
