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• Jet Power Control Module
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JET Power Control Module
The Power Control Module computer chip looks at
various sensors such as the manifold vacuum, coolant temperature,
throttle position and RPM. It then adjusts spark timing,
air/fuel ratios, etc. These minor changes provide major
improvements to horsepower and torque available at various
driving conditions (can you say "improved gas
mileage?").
Choosing
the correct chip is very important. Depending on your vehicle
and the intended application, there are three chips available from
JET Performance Products: Stage 1 is intended for
installation on stock engines with no other
modifications. Stage 2 is designed for modified
vehicles. Both these chips are street legal in all 50
states. Stage 3/Powr-Shift is the ultimate, and is defined as
"an aggressive transmission program." Not guaranteed to be
street legal, and probably not necessary for your rock crawler, but
wouldn't it be fun to try?...
*Check
out
http://www.jetchip.com/faq.htm
Installation of Stage 2 Power Control Module
Disconnect negative battery cable
Locate the stock ECM/computer (chart provides
guidance where it can be found on each vehicle)
Remove ECM/computer from its hold
down bracket to access all factory wire harness connectors.
Unplug the ECM computer harness (color will depend on
vehicle)
Plug the JET wiring harness into the stock
ECM/computer where you unplugged factory harness
Plug the factory harness into the JET PCM 
Locate power source connection (again,
instructions provide a chart for where to locate on your
vehicle). Crimp the 3M/Quick Splice connector supplied around
the wire with a pair of pliers
Plug the PINK wire from the JET PCM into the 3M
connector.
JET PCM does not need to be mounted, but
mounting tape is supplied.
Reinstall the ECM/computer into its original
location, reattach any hold down hardware as originally
attached.
Start vehicle and make sure the SERVICE ENGINE LIGHT
is NOT on.
Drive the vehicle to make sure everything is working
perfectly!
20 HP in under 20 minutes, Amazing!
JET Power Shift
Why a shift controller? Most sport utility
vehicles are designed with comfort in mind, not performance.
What may feel best to you as a passenger may not be what is
mechanically the most sound - in fact, it is not. The smooth
shifting an automatic strives for comes from the
transmission "slipping" gradually between gears.
Especially when performing under load such as towing, it is
difficult for the transmission to ensure this smooth shift.
By accepting a firmer grab of a gear (felt as a subtle jerk in
motion), you are allowing the transmission to lock in solidly, and
potentially prolonging the life of the transmission
itself.
Installation - The JET Power
Shift Controller is manually adjustable, so access to the control
is inside the cab.
The exact
instructions (with simple, clear diagrams, thank you!) explain how
simple the installation is:
Mount the Power Shift box in the desired
location.
Connect the RED wire to a 12 volt KEYED source (the
fuse box is a good choice). Make sure the power is on ONLY
when the key is on.
Connect the BLACK wire to ground.
Run the remaining two wires to transmission - model
4L60E should run to passenger side, 4L80E should run to driver's
side.
Crimp the 2 Scotch Lock connectors to the other side
of the C&D terminals.
Plug the connectors from the Power
Shift into the connectors that you crimped onto the transmission
wires. It does not matter which wire color is plugged in to
either of the connectors.
The controller
may be mounted in the cab anywhere you want - under the dash
seems the most logical placement and there is a flat spot directly
under the 12 volt plug area, but we left ours unmounted for the
time being. We wanted
to drive it for a short time
to see if we find we are frequently adjusting the
shift stiffness (keep it handy) or if we tend to set it
to one level and leave it (hide it someone under the dash).
With two frequent drivers of this vehicle and various driving uses,
we quickly determined we'll want to change the setting, so will be
mounting it where
the Controller is
easy to access.
NEED ADDITIONAL IMAGE SHOWING
CONTROLLER IN VEHICLE
Settings range from
Stock (which basically does not take advantage of any Power Shift
control), to Stage 3 (or, as I have come to call it,
"Whiplash". Second driver assures me they don't think it is
that bad, and in fact, prefers it. It has a high-performance
feel.) We generally leave ours set to Stage 2 which
definately gives driver and passenger a firm nudge when it shifts,
especially from second to third gears, but at least it doesn't
spill your drink out of the cup holder!
*It's important to note that when using the
Shift Controller, the transmission resets only when the
engine is restarted; if you change the setting while driving, the
indicator light will change but you will not notice a change
in shifting until the next time you start the vehicle. |
• Jet Performance SCU 2000
• |
JET Performance SCU 2000
The JET Performance Speed Control Unit is
necessary to calibrate your speedometer if you are
running larger than stock tires or have made any gear changes from
stock. Interestingly, as we noted before, it also eliminates
the top speed limiter as set by the factory. JET does warn
the user to carefully consider the tires you are running - the
vehicle WILL BE capable of exceeding the factory speed rating on
some tires!
Installation of Speed
Control Unit Disconnect negative battery cable
Locate relay center under dash on driver's side
Remove Velcro backing on SCU2000 and mount next to
the relay center.  Attach black wire from SCU2000 to
ground
Run extension wire supplied to fuse panel.
* The SCU must have a good and continuous
12V power source
Run SCU2000 wiring harness through firewall at
steering column grommet. 
Run harness along frame rail toward the reat of truck
to back of transmission. Note: Our installer, Robert from Jet, has
found a much easier way to do this. Robert located a boot passing
through the tranny tunnell. This allows a much shorter
and more direct route for the harness .  Locate stock speed sensor, unplug stock
wiring harness
Plug SCU harness into speed sensor  Adjust settings for gears and tires as
outlined in instructions.
With all these upgrades installed our the Tahoe,
we did see several immediate and pronounced improvements -
besides having an accurate speedometer reading, we saw an increase
in gas mileage and a definate change in the response of the
transmission. Still to check is actual dyno performance
against baseline from full factory stock. What could possibly
be next for Project Kickin' It? Hmm..... | 
The final product we're installing at this time
allows us to firm-up the shifts on our transmission. The Tahoe has
especially soft shifts from the factory, especially for towing. JET
builds a Power Shift Controller that gives you the ability to
select between four different transmission settings of shift
firmness - Stock, Stage 1, Stage 2, Stage 3 (also referred to
as "Race" in JET literature) Retail - $250
