We test some high-tech
by Hib Halverson
©1998 by Shark Communications
updated April 2004
No Use Without Permission
Recently, at the request of the Idaho Corvette web
site, I tried out five technology-filled products that make diagnostic,
maintenance, or modification of our cars easier. Products covered were
either evaluated specifically for this article or had been used by
myself for some some time prior to this story.
Auto Meter Battery Extender
Auto Meter Battery Extender You may own Corvettes that are parked or
stored for long periods. If you do, occasionally, you've probably had a
dead battery. Even the best battery connected to nothing slowly
discharges because of the chemical processes at work inside it. Once
hooked to your car's electrical system and when the alternator is not
charging, besides that tiny, self-discharge rate, a battery has a
small, constant load on it from things like: PCM memory, radio presets,
clock, anti-theft devices and, if you open the doors while the car sits,
interior lighting. If a period of non-operation is a few months, it is
possible the battery may discharge to the point of a no-start condition.
Then, you either charge the battery or jump-start the car. These
full-discharge-then-recharge or "deep cycles" reduce battery life. The
durability of typical automotive batteries is significantly reduced if
they're subjected to deep cycles on a regular basis. The old solution
was to leave a "trickle" charger connected to the battery. Most trickle
chargers put out between 0.5 to 2 amps. Indeed, that charges the
battery, but trickle chargers do as much harm as good. Once the battery
is at full charge; a continuing 0.5-2 amp charge eventually overcharges
it. That can damage a battery just as much as successive deep cycles.
The solution is a "smart" battery charger, such as Auto Meter's Battery
Extender. Upon connection, if the battery is partially discharged, a
Battery Extender brings a battery up to full charge using a one-amp
rate. At that point, a microprocessor senses battery voltage at a
nominal level and backs-off the charge rate to between 0 and 250
milliamps, depending on load. This feeback-controlled, reduced charge
rate eliminates overcharging and extends battery life. There is no need
to monitor a Battery Extender. Just plug it in, connect it to the car
and forget it. Auto Meter makes two versions of the Extender, a 12-volt
unit (p/n 9201) and a 12/16-volt unit (p/n 9202) aimed at racers using
16-volt electrical systems. The original Battery Extender was introduced
by AutoMeter in 1999. It was upgraded a year later with a battery
condition test feature which flashes the unit's charge light if it
detects a dead battery cell or if it detects that the battery is
sulfated. We have four cars in the shop which are inoperative for long
periods. We used to regularly have dead batteries and, occasionally, the
inevitable battery failure due to deep cycles. Putting Battery Extenders
on each of these cars has eliminated those problems. This inexpensive
device is on our must-have list. For more information, contact Auto
Meter at 413 W. Elm St., Sycamore IL 60178, web:
, tel: 815-895-8141.Vetronix Mastertech
Vetronix Corporation is the Santa Barbara, California firm that
developed the TECH1 scan tester for GM in the mid-í80s. The TECH1A is
still sold by Vetronix and about 45,000 of them are in service
world-wide. The T1ís success enhanced Vetronixís reputation in the
diagnostic equipment industry such that, in the early-í90s, the U.S.
arms of a couple of big Asian manufacturers came looking for specific,
high-end scan testers for their dealer service organizations. Later,
Vetronix rolled that platform into a generic high-end tester and called
Mastertech is best described as: TECH-1, only more
so. While it shares the basics that made the T1 a great device; its
improvements make it an even more powerful, hand-held diagnostic
computer. Like other Vetronix equipment, itís built to tough, dealer
service standards. Its 3-in LCD display shows either 16-lines of
user-selectable data in the list or snapshot modes, six data parameters
in the bar graph mode or two in the line graph mode. The unit has eight
LEDs that can be configured to show discrete data such as closed/open
loop, rich/lean flags, HVAC requests or shift switch condition.
Mastertech also has limited digital meter functions:
voltage, duty-cycle and frequency. It has an oscilloscope mode that can
display waveforms typical of MAF, MAP and oxygen sensors or any other
waveform with an amplitude of 20 volts or less. With the addition of an
optional, "enhanced diagnostic lead set", the oscilloscope
mode can be used in high-voltage situations. With EDLS, Mastertech
directly displays waveforms up to 600v and though an inductive pick-up,
can graphically display spark plug voltage levels. The Mastertech even
has "on-line" help. Rather than rummaging around for the
manual, basic questions on operation can usually be found by simply
pressing the "help" key. Vetronix has Mastertech software for
the powertrain, chassis or body computers in all í81-í96 GM cars and
trucks that have computers and í97 and í98 are only partially
Weíve used a Mastertech for several years, not only
for diagnostic purposes, but also as a data logger during chassis dyno
tests. Itís performed very well in both roles. If youíre starting a
high-end, diagnostic tool box; consider the Mastertech. Itís
leading-edge stuff and one of the more advanced scan testers on the
market at this writing. DIYs can buy the Mastertech though Mac Tools.
For more information, contact a Mac Tools dealer or the Vetronix
Corporation, 2030 Alameda Padre Sierra, Santa Barbara, CA 93103, (800)
MSD Ignition Tester
This handy device tests MSD ignition amplifiers as
well as those of other manufacturers. It is no more than an adjustable
signal generator that substitutes for whatever triggers your ignition.
It saves time in
troubleshooting and by assisting in decisive diagnosis.
To use the MSD Tester simply connect its power leads
to the carís battery and its white wire to either the magnetic
trigger, positive input (a violet wire or a connection marked M+) or the
white wire input of the MSD. If the ignition amp is not an MSD, but uses
a magnetic trigger; find the magnetic trigger positive input and connect
the Testerís white wire to that. A special testing spark plug is
included with the unit. Clip that to a good ground and connect the
distributor end of the coil wire to it. Select the number of cylinders
with the switch on the tester, turn on the carís ignition then vary
the testing rpm with the thumbwheels on the side of the tester.
Recently, using this device, I troubleshoot a car
with intermittent no-start and ignition cut-out problems. The process
quickly showed the carís six-year-old, MSD 6T was the problem. The
unit had been subjected to street high-performance/racing duty cycle for
nearly 40,000 miles, reasonable durability for an ignition product used
that way. I sent it to MSD and, in spite of it being out of warranty,
two weeks later it came back repaired for just the cost of the shipping.
The MSD Ignition Tester can be used to diagnose many
ignition related problems. For more information, contact the Autotronic
Controls, Corp., 1490 Henry Brennan Dr., El Paso TX 79936, (915)
Non-contact thermometers are an example of how technology, need and high volume production combine to make a practical, affordable tool. Infrared (IR) thermometry measures thermal energy emitted by an object without the measuring device having to touch the object. This allows quick, safe measurement of the temperature of things that are moving, extremely hot or difficult to reach.
The Raytek Corporation has marketed these devices to consumers and the automotive service trade since the mid-í90s. Of interest to Corvette DIYs are the consumer-oriented, MT "Mini-Temp" series and Raytekís newest unit, the professional grade, Autopro. A Raytek IR thermometer is elegant in its simplicity. Point it generally towards what you want to measure, pull the trigger to turn on the sensor and the laser sight, put the laser point on the spot to be measured, then read the temperature on the rear-facing display.
There are many uses for a Raytek. Have an engine with a hard-to-find misfire? Point the tool at each exhaust port. If you find one thatís significantly cooler than the others, thatís your cylinder with the miss. You can check fuel distribution the same way, only you look for more subtle temperatures differences. Got one port thatís a little hotter than all the others? Thatís a clue that cylinder is running a bit lean. How about a catalytic converter whose operation is suspect? By measuring the inlet and outlet temperatures, you can determine if the cat is working or not.
You can assess the condition of universal or constant velocity joints with an IR thermometer. Drive the car for a while, then park and measure the temperature of the u-joints or CVs. If you have a joint thatís running at a noticeably higher temperature than the others, thatís a clue that joint may have a problem.
Got a Corvette that doesnít cool well under load but the cooling system seems to check-out ok? While the engine is running, point the Autopro at different areas of the radiator. A partial blockage of some tubes will appear much cooler than surrounding tubes. If the gauge shows hot but the engine exhibits no symptoms of overheating. Measure the water outlet or the temperature sensor to verify the gaugeís accuracy.
You can measure brake temperatures and, with the help of an assistant, even do it while the car is moving. You can measure tire temperatures to determine how inflation pressure is affecting the tires footprint on the road. You can use an IR thermometer to acquire test data relating to alignment or to help balance a race car chassis.
In the late-í90s, I began using Raytekís breakthrough "Raynger ST3" (now discontinued), the companyís first reasonably-priced, consumer product, in automotive service work. Since then, Iíve also used a MiniTemp MT4 and an ST30.
Until late 2002, Raytek marketed itís general purpose ST series to advanced automotive DIYs and the service trade, however, in several years of selling these tools to the automotive market, sales volume grew to the point where an automotive-specific product was justified. The Autopro combines many of the core features of the ST series with specialized enhancements such as a dual-beam laser sight designed to make IR thermometer use more convenient in the automotive environment. A white LED which comes on when the trigger is pulled to illuminate the measuring area. Bright orange trim to make the Autopro easy to find on a crowded work bench. A removable magnet that attaches to the bottom of the handle such that you can stick the device on the side of your tool box or to a metal work bench when itís not in use. All of these features plus the accuracy and quality Iíve come to expect from Raytek products have made the Autopro a favorite of mine. Iíve used it for a wide variety of Corvette service tasks, some of which are listed above.
The MiniTemp is a smaller, less expensive and slightly less-capable IR Thermometer. While Iíve used a MiniTemp for some automotive tasks, Iíve also used it for "mission critical," non-automotive purposes like verifying the beer in my cooler is adequately chilled or measuring the temperature of a steak on the barbecue out back of the shop.
A MiniTemp works well for around-the-house tasks such as spot-checking or troubleshooting heating and air conditioning systems, testing doors and windows for drafts or heat loss, checking soil temperatures in gardens and greenhouses and verification of the operation of water heaters, stoves and other appliances. The MiniTemp MT4 is Raytekís best value. It can measure up to 500įF, has a laser sight and costs $99.
Functionally, Autopro is a better choice for automotive use with its wider temperature range (-25įF to 999įF), increased measurement accuracy and other automotive-specific features listed above. The Autopro comes with a wrist lanyard, a comprehensive instruction manual and is packed in a tough, plastic carrying case. Admittedly, the Autoproís higher price ($199) may dissuade some people, but it was my clear favorite for automotive work. That earns the Autopro a permanent spot amongst the digital aids that make my Corvette life easier.
All Raytek IR thermometers carry a one-year warranty. For more information, contact the Raytek Corporation, Box 1820, Santa Cruz CA 95061-1820 Tel: 800-866-5478.
An Autopro can be used to check coolant temperature. The reading here was within 3 degrees of what the IPís digital readout showed.
The Vericom VC-2000 Performance Computer
The 1986 introduction of the Vericom VC-200 was a
milestone. It made affordable, portable and accurate vehicle dynamics
testing available to enthusiasts. Of the products evaluated for this
article, the one weíve used the longest is the Vericom Performance
Computer. That makes a pretty strong statement about the reliability and
durability of Vericom products.
After Iíd used a VC-200 for 12 years in countless
vehicle tests, the people at Vericom suggested I upgrade to the new
VC-2000. While Vericomís basic featuresĖeasy-to-read display,
convenient interface, lighted key pad and stable four-point mountingĖcarried
over to the new VC-2000; there is significant improvement, also.
The first thing I noticed is a 40-character, LCD,
dot-matrix display that shows two and a half times more data and is
easier to see in bright light. Our trusty VC-200 provides test data for
one, specific distance. That means lots of testing if I want
quarter-mile info, a 60-foot time and 0-60 mph data. The VC-2000 gives
that and more. In the acceleration mode, it displays time, speed,
acceleration rate and net horsepower at 15 ft., 30 ft., 60 ft., 330 ft.,
1/8 mi., 1000 ft. and 1/4 mile. They also read time, distance and
acceleration rate for 0-30 mph and 0-60 mph. Increased data per test is
the biggest advantage I saw in upgrading.
The VC-2000 is available in five models, three aimed
at DIY enthusiasts and racers and two more, higher-priced units, aimed
at vehicle development engineers and other professionals. All use
Vericomís patented, highly-accurate capacitance accelerometer coupled
with a crystal-controlled clock and a microprocessor. All that makes a
basic inertial navigation system. More complex versions are used in
aircraft. A principle of inertial navigation is: if you know the rate an
object accelerates, the objectís mass, when the acceleration started
and the time elapsed during the acceleration, you can compute how fast
that something went, how far it went, how long it took to get there and
how much energy was expended to get it there. That is what a Vericom
Performance Computer does.
The best value is the entry-level, "VC-2000
Race". It delivers all basic features and lists at $527.00, a heck
of a bargain considering, 12 years ago, the VC-200 sold for 400 bucks.
This piece of equipment meets the testing needs of most enthusiasts and
racers competing with production-based cars. The next step is the
"Race Plus" which adds battery power. All Vericoms run of a
carís cigar lighter, however, the VC-2000 Race and other uplevel units
also have internal batteries. Battery power is handy when the 12-volt
socket is used by other devices and it allows the Vericom to be used in
cars without lighter or accessory sockets. The uplevel Vericoms have
extra RF interference shielding needed when magneto ignitions or solid
core plug wires are used. The top-of-the-line Race unit adds a
tachometer input allowing display of rpm and net torque output.
The VC-2000 Professional Series models have
significantly more computer power giving them on-board data storage for
up to 98 test runs and the ability to communicate with personal
computers over an RS232 communications link. They also have a connection
for any switched, 12-36 volt input to trigger the unit.
VC-2000 Pros come with "VC Profile", a
software application that runs on a PC using either Windows 3.1 or 95.
VC Profile increases the power of a Vericom as a vehicle testing tool by
assisting the user in organizing, analyzing and comparing data. It can
save data to disk. VC Profile has numerous other data management and
A common Vericom question is, "How accurate is
it?" Compared to conventional timing, I find itís almost always
within 0.1 second. The VC-200 I used for so long did not allow change of
the trigger acceleration threshold, however, a VC-2000 does. I have not
used the new unit long enough to establish a trend, but I believe, when
the threshold is reduced from the 0.2g default to 0.1g; accuracy may
improve to less than Ī0.1 sec.
Compared to drag strip clocks, one factor a Vericom
canít consider is "roll out", the distance between the point
at which the car starts to move and the point at which the clocks are
started by the carís front wheels. Because of this, a Vericom reads a
longer time but almost the same speed. Roll-out varies with front tire
diameter, how hard the car leaves and whether itís deep- or
shallow-staged, but usually itís between 0.2-0.4 seconds. The VC-2000
instruction manual has a detailed discussion of roll out along with an
explanation of how to figure roll-out time.
Anyone needing comprehensive test data about the
performance of their car, needs a Vericom. For more information on the
VC-2000 Performance Computers, contact Vericom Computers, Inc., 6008
Culligan Wy., Minnetonka, MN 55345. (612) 933-4256., email@example.com
. also, www.vericom.org.
Return To Technical Page
Return To Corvette Articles
The Web Surfers Guide To Diagnostic Equipment