A 2005 PT Cruiser GT is the test car for efficient-mileage.com.
The goal is to find out just how well each of the fuel-saving strategies
work. Measurements will be recorded by a dynamometer, a DashDaq
data logger, and on a drag racing strip. Data recorded from each
alteration will be compared against a baseline reference. Each strategy
represented by a single product will be sorted in a chart to rate
the value of the modification. This way the readers can choose what
to do based on unbiased data.
The PT Cruiser averages 20.28 mpg on my regular driving
circuit. It averages 20.28 mpg if the engine speed is kept low,
and the rate of acceleration kept slow. It averages 20.28 mpg under
normal driving behavior mixed in with a few traffic light drag races.
If the car sees a lot of wide open throttle or frequent traffic
light drag races the gas mileage will average between 13 - 17 mpg.
Spending 99% of the time on the open freeway yields 24 mpg. For
gas mileage comparisons I'll stick to normal driving on my regular
driving circuit since that produces repeatable results.
The PT Cruiser GT test car reference point has a maximum
horsepower of 196 bhp and maximum torque of 260 ft lbs. The average
gas mileage is 20.28 mpg.
Your results may vary.
Different cars will yield different results. All engines
may be governed by the same natural forces, however different forces
are at work in different engines. And of course your results will
vary if you have a mischievous family member who secretly siphons
and fills your gas tank. Generally though, I would expect the benefits
to be proportional to the engine displacement.
Peak engine power will be measured on a dynamometer
after each modification. A dynamometer measures engine power under
load at wide open throttle. Engine torque is the work directly measured
and horsepower is calculated by the rate (time) at which work is
Fuel stoichiometry will be measured on the DashDaq
with a wideband oxygen sensor. Stoichiometry is the measure of ratios
between combustible chemicals. In this case, we're measuring the
ratio of air molecules to gasoline by observing the exhaust content.
As engine conditions such as load, rpm, and air temperature change,
so does the stoichiometry. The ideal air to fuel ratio is 1 part
fuel to 14.7 parts of air. If the ratio goes higher than 14.7, then
the engine is running lean and is in danger of knock or detonation
(that's bad). If the ratio goes below 12, then the mixture is rich
and the engine is wasting fuel unnecessarily. It's always safer
for the engine to run a little rich.
The DashDaq will record the relationship between the
air fuel ratio to engine load, rpm, air temperature, etc. It can
also log calculated changes in acceleration, power, and fuel consumption
in relation to part throttle and various engine loads. The Dashdaq
will also measure 60-0mph braking distance.
engine computer reprogramming compared to reference
water/methanol injection compared to reference
water/meth + reprogramming compared to reference
CermetLabs oil additive compared to reference
CermetLabs + reprogram + water/meth compared to
Fuel saver program on the DashDaq + modifications
compared to reference
ported bolt-on engine components + reprogram + water/meth
+ CermetLabs compared to reference
Fuel saver program on the DashDaq + all modifications
compared to reference
'How to' section
The How To section shows the installation processes
on the test car. There are tips, photos, shopping lists, and detailed
explanations that support each modification.
Water / methanol
DashDAQ at work
Ported turbo and ported manifold
New charging wires and battery
Big Brake Kit
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