By David Koehler
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To test the electrical
interference resistance
the box was attached
directly to the coils of a
running engine. While the
engine was running the
PROgressive was put
through its paces and
worked reliably each
time, every time. This
may not appear to be a
laboratory high tech test
but it is as race car real
life as it is going to get.
I thought I would show you what the solenoid sees. I set up a test on our flow
bench and logged it. Above you see a full ten second pulse sequence using a
common .110 orifice nitrous solenoid. While there is little need to progress the
solenoid longer than 3 seconds in drag racing it does verify that the box can do
the job. If you need to progress longer than 3 seconds then you have other
chassis issues that need addressed first.
Zooming in to the rise time using the
progressive, we can see a curve as
the jet flow rises to meet the
solenoid reading. This is exactly
what we need and the first 2 tenths
to a second of activation time is
what does the most good as a
traction control. The rest is wasted
energy.
Floggin It
This strip chart shows a
normal nitrous run with
readings taken just
before the solenoid and
just before the jet. Note
the rise time on the blue
line as the line fills up
and the jet pressure
meets the pre-solenoid
pressure. It fills up fairly
quickly.
Now, let's look at what takes place
in progressive mode. The rise time
takes a little longer to reach full
steam (which is what we want)
and the total flow available to the
jet is reduced. The blue line also
shows how you can run out the
progressive for the full ten
seconds. If I had programmed it to
go to full flow, after a second or so
you would see the blue line rise up
to almost meet the red line for the
rest of the race. I say almost
because, as you noticed in the
first normal nitrous run, the
pressure drops off the longer the
run goes. This is due to the bottle
volume being reduced.
Review of Racing Instrumentation's  Nitrous PROgressive Controller
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217 469 7663  
M-F  9 - 5 CST
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