MoDS PLEASE dont move this as most of the folks with 2 steps are turbo guys

Here is the pdf file

http://mssftw.com/files/2step%20instructions.pdf

 

2-step Installation and Operating Instructions

Chose the mounting location:

The wiring harness for the 2-step should provide you with enough flexibility to mount the control
box in many locations. Chose a location that will allow you to route the harness to each coil pack
on the engine while maintaining some slack in the harness to account for movement of the engine.
Be sure to route the harness and mount the control box away from the exhaust and serpentine belt
path.

Electrical Connections:

There are 3 parts to the wiring harness:
Coil pack connections (Large bundles terminated with connectors)
Activation inputs (Long white and gray wires)
Relay output (Short yellow wire)

Coil Pack Connectors:
The coil pack connections are made by intercepting the PCM control signals at the large gray
connector in the center of each coil pack. The harness has 2 pairs of connectors, one pair for each
bank. Unplug the connectors on both coil packs and jumper them using the paired connectors of
the 2-step wiring harness. Either connector pair may be used on either engine bank.

Activation Inputs:
The 2 inputs can be used to provide two different modes of operation. Simple On/Off operation
and latched operation.

On/Off Operation
On/Off operation allows the user to activate and de-active the 2-step manually.

White wire(Arming Switch): Momentary switch to ground.
Normally Open, close switch to active.
Gray Wire: Connect to ground or parallel with White wire

Latched Operation
Latched operation allows the user to either activate the 2-step manually, or “arm” the 2-
step with deactivation based upon a secondary input. This is useful for manual
transmission applications where the 2-step should deactivate when the clutch pedal is
released, or in automatic transmission applications where the foot brake is used for
staging.

White wire(Arming Switch): Momentary switch to ground.
Normally Open, close switch to active.
Gray wire(Hold Switch): Clutch pedal switch, foot brake switch, or custom.
Normally Closed to ground, open switch to active.

Relay Control Output:
The relay output provides a switched ground whenever the 2-step is armed or active. This can be
used to deactivate a nitrous system that normally uses a wide open throttle switch for activation of
the nitrous, or for an indicator that the 2-step is active.

Setting the 2-step rev-limiter:
To use the 2-step you must first set the RPM point at which the rev-limiter is activated. This is
done using the two rotary switches at the top left corner of the circuit board. The two switches are
for setting 1000’s and 100’s places, the switches are labeled on the circuit board.

Example: To set the 2-step rev-limit at 3500 RPM, the switches should be set to 3 and 5.

1. Remove the cover from the control box.
2. Set the rev-limiter RPM by rotating the switches, make sure that the number is clearly visible
in the cut-out on each dial.
3. Replace the control box cover.

Setting the switches both to zero (0) will put the 2-step in bypass mode. This mode turns the 2-
step off, all control inputs are ignored and the 2-step rev-limiter is never activated.

Manual Operation:
When using the 2-step in manual operation mode, you simply press and hold the Arming Switch.
As long as the switch is pressed, you can go to Wide Open Throttle and engine speed will be held
at the point you have set via the rotary switches. Once the Arming Switch is released the 2-step
limiter will be turned off, and the engine will return to full power.

Latched Operation:
When configured for latched operation, the 2-step may still be activated/deactivated manually
using the Arming Switch as outlined above. However, you may only use this functionality if the
Hold Switch has not been activated.

To latch the 2-step on using the Hold Switch, activate the Hold Switch by depressing the clutch
pedal or foot brake (this will vary by application). While the Hold Switch is active, press and
release the Arming Switch. The 2-step is now active, and will remain active until the Hold
Switch is released. While the Hold Switch is still active, you may press and release the Arming
Switch again to deactivate the 2-step.

Precautions:
Make sure all of the switch connections and relay control connections are secure. Loose
connections may result in unexpected or improper operation. Be sure the coil pack connectors are fully
seated and the latches are latched.

DO NOT USE THIS DEVICE ON VEHICLES EQUIPT WITH
CATALYTIC CONVERTERS!!!!!

The 2-step maintains engine RPM by reducing the engine torque to near zero as engine speed
approaches the set limit, this is done by dropping ignition to an increasing number of cylinders in a
rotating pattern. Although ignition is cut, fuel is still being delivered. Raw fuel is VERY damaging
to the catalysts, and using this device on a vehicle equipped with catalysts WILL damage them. If
you do use the 2-step on a catalyst equipped vehicle, you are doing so at your own risk. You have
been warned.

You should only use the limiter for as long as you need, avoid extended periods on the limiter. Extended
periods on the limiter can cause a Misfire SES to set in the PCM and possible backfiring in the exhaust.