Wilson Manifolds 810100 Progressive Nitrous Controller and Vehicle Data Logger - Manual (Page 16)

Nitrous Pro-Flow, 4700 NE 11
th
St., Ft. Lauderdale, FL 33334 Pro-Flow Part. No. 810100
(954) 771-6216 www.nitrousproflow.com 1/2008
Page 16
(closed) and 100% (wide open) TPS. If you want
very accurate values, you can use a DVM to
measure the voltage by probing between the TPS
and ground terminals on the nitrous controller.
Enter the zero and 100% TPS values in the PC
Link Nitrous software and upload to the unit.
8. Cycle the ignition key off/on. In the Nitrous Log
software Real Time Display Options, change
Throttle Position (TPS) to Percent (0-100). Then go
back to View Real Time Data and verify that the
TPS gauge goes between zero and 100% as the
throttle is opened.
9. Skip this step if you are not using the VSS
connection. Establishing the correct VSS scale
factor in PC Link Nitrous will require some trial and
error. Start with the default setting. Arm the nitrous
controller to log speed data while operating the
vehicle at a known speed. Use Nitrous log software
and download data from the unit to read the
logged speed data. An alternate approach is to
have a passenger monitor real time data with
Nitrous Log. Use the following formula to calculate
the correct scale factor:
New VSS Freq = Original VSS Freq x Speed Reading
Actual Vehicle Speed
For example, if the original VSS frequency
parameter was 145 Hz, the speed reading is 40
MPH and the actual vehicle speed is 50 MPH, then
the new VSS frequency parameter should be:
116 Hz = 145 Hz x 40 MPH
50 MPH
You may have repeat this process several times
for maximum accuracy.
10. Enter reasonable values for PC Link Nitrous
controller parameters and general setup and
upload to the nitrous controller. Additional
information is provided in the following section.
Contact tech support if you need help.
11. Leave the nitrous bottle valve shut and maxi-
fuse(s) disconnected until you have completed
checking system operation. Try a “dry” run with the
nitrous system armed. Then use Nitrous Log to
download and examine the logged data. You can
verify that the purge (if used), nitrous, and fuel
solenoids were triggered under the correct
conditions.
OPERATING TIPS
Safe nitrous system operation depends on
proper controller setup and system jetting. The
controller parameters should be set so that once the
system is armed, it will be triggered on at wide-open
throttle within reasonable RPM limits. The default TPS
Off and On values of 90% and 95% work well for most
applications. The maximum RPM value should be
several hundred RPM below the engine RPM limit.
Most fuel injected vehicles cut fuel at the RPM limit. If
the nitrous system is still on, the resulting lean
condition could cause serious engine damage.
Nitrous system activation in first gear,
immediately after vehicle launch, or immediately after a
shift can cause wheel spin in some applications. The
unit includes first gear lockout, minimum VSS, delay,
and progressive (PWM) control functions. One or more
of these functions can be used to reduce wheel spin. A
long one-shot delay or minimum vehicle speed can be
used to prevent activation until the vehicle reached a
point down the track where wheel spin is not
problematic. A short delay (not one-shot) can be used
to prevent wheel spin immediately after a shift.
Remember that progressive control starts after
triggering conditions have been met. Time based PWM
is safer. If you use RPM based PWM, even slight
wheel spin will cause the engine RPM to increase. If
the higher RPM level results in more nitrous flow, an
unstable runaway situation will result. RPM based
PWM along with the hookup shown in Figure 3 is most
suited for correcting AFR imbalances throughout the
RPM range.
We suggest a two step approach to jetting the
nitrous system. First, select nitrous and fuel jets based
on the manufacturer’s recommendations for the
desired horsepower level. The manufacturer’s
recommendations are generally conservative and will
result in a somewhat rich AFR value. Next, use a wide-
band AFR system such as the Daytona Sensors
WEGO III series and the data logging capability of the
nitrous controller. Log data from several runs and
make adjustments to the fuel jet(s) so that AFR values
remain in the low 12 range. If you are using RPM
based PWM with the hookup shown in Figure 3, you
can trim the fuel or nitrous PWM ramps to maintain a
constant AFR throughout the RPM range.
Late model fuel injected vehicles with dead-
headed fuel rails (no fuel return) are prone to a
momentary fuel pressure drop and resulting lean AFR
when the nitrous system is first activated. These
applications will benefit from a fuel accumulator such
as the Nitrous Express P/N SPEED00010.
WARNING: Over time, PWM operation may
cause the solenoid valves to leak. To avoid a
safety hazard, frequently check for leaks.