Autotech Power Module for KE-Jetronic VWs
have found that in order to meet rigid emissions and economy requirements, the
KE-Jetronic Volkswagens are running considerably leaner than the ideal
air/fuel ratio which produces the most horsepower.
Substantial horsepower gains can be seen by merely making sure that the engine
is getting the fuel that it needs. Basically, the more air that an engine is
moving, the more that the engine stands to gain by getting additional fuel.
The chemical minimum for complete fuel combustion is a 14.7:1 air-to-fuel ratio,
termed the "stoichiometric" ratio. Generally, peak horsepower is achieved
when an engine (any engine) is run on about 5% to 15% less air than stoichiometric.
We knew that since KE-injected cars run leaner than the performance ideal,
horsepower gains could be seen just by properly administering the correct amount
of fuel to the engine. It is also known that engines with modifications such as
cams, exhaust systems, and increased displacement move much more air than a
standard engine. If the fuel system is left in its standard form, these engines
tend to run even farther away from the ideal ratio of air and fuel.
Autotech's Power Module was developed to rectify the power robbing condition of
insufficient fuel delivery. This electronic device simply administers the
correct amount of fuel needed, when it is needed, for maximum performance. It is
designed for use on all 1985-89 Volkswagen automobiles that use Bosch KE-Jetronic
The Power Module measures two parameters, engine speed and throttle
position, in order to properly determine when additional fuel is required. Then, it
sends a predetermined current to the Electro-Hydraulic pressure Actuator, or
EHA, which controls the amount of fuel being sent to each injector. This modified
current tells the fuel distributor to increase the fuel supply to the
The Power Module's ability to "think" for itself is what makes it different from
other enrichment devices on the market. This device is not "on" all the time, it
engages only when conditions find it necessary. This allows your fuel injection
to function as if it were unmodified during normal use.
The Power Module will not interfere with the injection during steady-state
cruising and remains "transparent" during critical cold-start operations. In fact,
the Autotech Power Module has earned an exemption order from the California Air
Resources Board (C.A.R.B. E.O. # D-375), making it 50
state emissions legal. Tune up specifications for your car with the Power
Module installed are exactly the same as stock.
The Power Module has one adjustment. It controls peak fuel delivery. Each of the
settings is designed for specific vehicles with certain levels of modification, from
stock Fox to 2.1L 16V. Detailed instructions tell you where to set the
device for optimal performance.
Gains typically range from 4 to 7 horsepower, depending on the type of motor
and its modifications. We have never experienced a gain of less than 4
horsepower, and have seen gains during engine dyno testing as high as 14
horsepower (this incredible gain was seen on a highly modified 1.8 liter 16V
engine). Again, the more air the engine is moving, the greater the benefit from
The Autotech Power Module is very simple to install. It requires only 20 to
30 minutes time, and no special tools. The wiring harness uses factory connectors to
maintain the highest level of fit without wire cutting. None of the original wiring
on your vehicle is removed or modified.
* Some 1985-87 GX-engined cars, and all 1987-89 Fox models, came without a full
throttle switch from the factory. Cars without factory full throttle enrichment
switch must add one.