By David Koehler
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Some of you are probably wondering where the initial on-time and total nitrous
settings are. These are not designed into this unit as it is aimed at drag
racers with traction issues as opposed to street machines. It is also designed
to work with nitrous systems that use the larger than purge size solenoids.
The unit is a direct drive, one speed deal. It reduces the flow rate down 50%
of total flow for the time you designate. This flow reduction tied together with
time will give you enough traction control to get the car moving before it ramps
up to full flow.

To reduce the initial hit further requires that the solenoids open and close at a
faster rate and this can be a problem with the large solenoids. They reach a
point where coil saturation occurs and the internal piston just hangs and does
not open or close. This unpredictable and unreliable situation is well known
and led to the decision to leave some of the eye candy out of the design.
As we went to press there is a Turbo version being finalized. This version is
reversed. To compensate for turbo lag on launch, the nitrous hits at normal
full flow and then ramps down to zero over the set time as the turbo spools
up. This process will improve the 60-foot times of these cars.
I spent the better part of a week beating on this thing and did not manage to
kill it. I thought that spoke fairly well as to its design and I liked it well
enough that I elected to take on distribution of this tool. I feel the
possibilities are endless since I can use it either as a progressive, as a
multi timer, or both. There is also the cool two-program switch and
independent control over the solenoids. You may want to consider the
possibilities of the normal or reverse version as I suspect there are uses for
the fuel injected crowd (blown or NA) as well as the nitrous and non-nitrous
user alike.

The PROgressive is available separately or you can purchase a complete
package with the software, interface cable, fuse, terminal ends, wire and six
relays.
Your learning
curve is pretty
short. You have
already wired up
an ignition
system and
worked with
relays, so this
will be a piece of
cake. To get
acquainted with
how it works, I
suggest you do
as I did and sit
down with the
directions, wiring
schematics,
software, and the
controller.
Wire up the controller with some extra switches you have laying around.
Shown in the photo are a throttle switch, reset/purge button and a switch to
choose program 1 or 2. Go back and forth between the instructions,
software, and putting the box through its paces and you will have a solid
working foundation in an hour or so. Don't sweat the software. If you can find
the computer ON button you can work this user-friendly software.
Getting Started
Turbos & Nitrous
End Game
Review of Racing Instrumentation's  Nitrous PROgressive Controller
Site Map
Racing Instrumentation web site
All Text and images on this website are copyrighted by David Koehler 2000 and beyond
All sales are final. Items and services provided by Koehler Injection are intended for off road use only.
No responsibility whatsoever will be accepted by Koehler Injection for any damage, injury or loss resulting from their use.
Nitrous Master.
Urbana IL, USA    217 469 7663     M-F  9 - 5 CST
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Urbana IL, USA 
217 469 7663  
M-F  9 - 5 CST
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