Road Dyno creates detailed graphs of power & torque and
a tabulated output.
Power measurements from 1HP to 1000HP!
It's also great for fault finding engine and ignition problems.
Complete with serial download cable, ignition clamp and cables,
and software for Win 95, 98, 2000, XP.
Road Dyno - What does it do?
A dynamometer is basically a device that measures the amount
of power being developed by an engine. A good dyno can analyze
the entire power band of any engine and present the user with
the results in some type of readable format. In the past,
if you wanted accurate information about the performance of
your automobile engine, you had to take your car to a dyno
facility and have it tested. A typical dyno test usually costs
at least £75 and is only good for a single test.
The Road Dyno Kit allows anyone to get accurate dyno results
any time they wish. All you'll need is a flat section of roadway,
usually less than 1/4 mile in length. How does it work? Well,
basically the Road Dyno is a precision timing system that
looks at a record of ignition sparks or vehicle movement over
time. Based on when a single spark plug fires, the program
can compute acceleration, and therefore, power. The user must
supply the car's weight, gear ratios, tyre sizes, and some
other variables, but the rest is pure physics. This is not
a power estimating program! The Road Dyno measures the power
of your engine directly by making precise measurements. Many
programs are available that allow the user to "estimate"
power by supplying quarter mile speeds, 0-60 times, etc. Road
Dyno v1.0 measures power by the same method as a chassis dyno.
Instead of measuring the amount of power required to accelerate
a drum, you are measuring the amount of power required to
accelerate the car. This is really what you are interested
in anyway isn't it? Some cars may even perform differently
on a chassis (stationary) dynamometer because the car is not
actually moving. Accelerating the car has an effect on fuel
in the bowl of the carburettor (if you happen to have one
of those), oil distribution through the engine, air resistance,
turbo airflow etc, etc. The Road Dyno Kit will allow you to
accurately measure the amount of power your car is putting
to the ground, which is an invaluable tool when doing aftermarket
modifications. The Road Dyno taught us a LOT about the performance
of numerous cars. It identified a 5000 rpm stumble that was
traced to an overly sensitive knock sensor. After fixing the
sensor, the Road Dyno shows a smooth power curve.
The Road Dyno takes hundreds of power measurements through
the entire power band of the engine being tested. This provides
enough resolution to be able to analyze performance parameters
like spark advance, knock retard, power drops as a result
of fuel pressure, etc. For example, a power curve that is
jagged with small spikes indicates that the engine management
computer may be "hunting" for the proper timing.
The results will still be accurate, but the shape of the curve
tells a lot here. Also, a sudden dip in the curve can indicate
that the computer has detected engine knock and backed off
the timing. It is important to correct conditions like these
to ensure that your engine is performing to potential and
live a long life!
Proof that Road Dyno Works!
We have tested numerous automobiles, four of which were in
stock condition. On each of the four stock vehicles, the Road
Dyno produced numbers VERY close (within 5 hp) to stock specifications.
On the one modified vehicle, the Road Dyno returned numbers
exactly where expected (within 5 hp) when compared to other
vehicles with the same modifications that had been dynoed
at a dyno facility. In addition, several Road Dyno users have
run their cars on chassis dynos to compare. Not only do the
power curves match nicely, but the maximums recorded by Road
Dyno were within 5 hp of the chassis dyno! Please note that
the Road Dyno measures the amount of power actually used to
accelerate the vehicle. For this reason, it may be necessary
to add a small percentage (3-5% average) if you wish to exactly
match a stationary (chassis) dyno.
Consistency is important when making aftermarket modifications.
We performed 16 separate dyno runs on the same vehicle (95
Trans Am). Approximately six of these runs were done with
the car in the same condition (same mods). All six runs were
within 5 horsepower of each other. Although temperature, humidity,
barometric pressure, fuel, and even your car's computer learning
capability can affect power from one given day to the next,
the Road Dyno's accuracy is believed to be plus or minus about
3 horsepower. On this vehicle, we have not only improved the
consistency of power by removing the power fluctuation at
5,000 rpm, but also have added about 8 horsepower and trimmed
0-60 times from 5.55 to 5.45 just by using information provided
by Road Dyno runs!