Trialling a Rear Undertray Wouldn't any type of
aerodynamic undertray system only come into effect when the car would be moving
at a greater speed than 100km/h? Most spoilers are not really doing anything
until your doing greater than 130-140km/h (roughly speaking) so testing an
aerodynamic undertray at speeds of 100-105km/h would be pointless. How could you
expect any results? What was the point of such a test?
I enjoy your articles but was surprised at this
It is not true to suggest that aerodynamics
affects are relevant only at speeds over 100 km/h. In fact, in some vehicles,
aerodynamics become important at speeds over 20 km/h. Regarding the undertray,
as we showed in
Modifying Under-Car Airflow, Part 2, on some
cars an undertray gives clearly measurable improvements at test speeds of ~ 100
Evo Manual Shift
Just a quick message to ask whether you tried the
"tip shift" / self- shift of the Lancer Evo MR during this review -
Mitsubishi Lancer Evolution MR?
I drive a Passat TDI with DSG and find that the turbo lag combined with the DSG
result in some undrivability, but it can sometimes be overcome by shifting
Yes we tried it, but still found it difficult to
keep the engine on boost when driving hard.
Digital Pulse Adjuster
I'm looking for a PWM for the ECU output to the
fuel injectors. Your articles on your digital pulse width adjuster don't
specifically mention fuel injectors, but do mention solenoids... will it work?
Or is it only applicable for a fixed frequency application, as I noticed in Part
2 there is reference to setting a frequency value in the memory.
My MAP sensor sends a digital signal, so an
enhancer isn't readily available. I would also like to use your motor
controller, but again, there's the digital issue with the MAP driving the
controller. Perhaps with a filter or converter on the ECU or PWM output, that
could drive the controller?
Thanks for your assistance.
The Digital Pulse Adjuster varies in output
frequency to match the input. Re the motor speed controller, it is designed for
a variable voltage input only. You may be able to achieve that with a filter but
we don’t provide individual design advice.
Disappointed in Balance
I read some of your articles and am disappointed
in the balance presented, if you don't work for an oil company, you don't have
to promote them. re 'solar cars..No' catch up with technology of the 90's, solar
panel on house roof - charge battery pack - use battery pack to charge car
overnight. solar panels on an average car could recoup during the power used in
approx 60Kms of travel. we in Australia have so much sunlight and our best
exponents and engineers are going overseas where the world is interested in
using less oil.
What you describe is a battery electric car. As
Alternative Cars, Part 1 Electric,
these are very promising.
Just a small request. When carrying out new car
tests on utes of the 2wd manual gearbox variety, how about hooking up a caravan
or trailer, and try backing into parking spaces. Most of these vehicles
(especially Jap designed) run impossibly low 1st and reverse ratios, making them
all but useless as a workhorse. With 4wd of course, one usually gets a two speed
transfer case thrown in. If you're keen on doing 50kph in reverse, great, buy
one, otherwise get an auto - yuk!!!
Almost no press or hire cars have tow
So when you were using the Dwyer Magnehelic
Differential Pressure Gauge, did you have a sensor mounted remotely or how did
you do that? Obviously you couldn't read the gauge on the highway if it itself
were mounted under the bumper? I'd like to get one and do some of the testing
that you did...
What sensor? It’s just a mechanical pressure
gauge - you run a hose to the area of interest.