Dual Mode MAP/MAF Sensor Enhancer

This Map Sensor Enhancer has separate “City” & “Highway”

adjustments along with an “On” & “Off” (Original Factory Setting) switch. This device was designed to help fine tune fuel air ratios.

This guide will outline basic operation for both version 1 and version 2. If you have the dual knob version you can fine tune in hwy mode and a default setting of less lean than HWY will be used when switched to city. Most users choose the one knob version and keep their system in HWY mode until more power or heavy acceleration is needed. At this time it is temporarily switched to city mode.

ALLHHO TECHNOLOGIES has access to manufacturer level schematics for virtually every vehicle made.

We are charged a fee for access to this database as most major auto repair facilities are.

The information provided from this data base is very detailed and far more detailed than an off the shelf manual. If you would like the manufacturer wiring schematic for your vehicle we can provide it for a fee of $25 for up to three vehicles.

This will help you identify location of sensors and wires along with color codes and much more.

Please call :

ALL HHO TECHNOLOGIES 

Toll Free 1-888-456-5592  (hours of operation are 9am-5pm M-F) MST

HOW DOES THE MAP SENSOR WORK?

The Manifold Absolute Pressure (MAP) sensor signal is electrically used in a similar way to the use of Mass Air Flow (MAF)

sensor signal (although internally it is built differently). It takes a 5 volt power from the ECM or ECU (Engine Control Unit or

Module) computer, and returns a lower signal in accordance with the vacuum in the engine. A higher output voltage means

lower engine vacuum, which is then calculated as “more fuel is needed”. Lower output signal indicates higher engine vacuum,

which requires less fuel.

It's not just fuel control. The MAP sensor signal gives the computer a dynamic indication of engine load. The computer then

uses this data to control not only fuel injection, but also gear shift and cylinder ignition timing.

 
THE ENHANCER
The invention we're talking about here is a simple play with resistors. A resistor is a little piece of carbon that reduces current.

Higher value means it resists more. The potentiometer (“pot” for short) is a variable resistor, which varies its value by turning the

knob. There is another resistor, a fixed value resistor, in series to the pot to increase the dial range.

The MAP or Manifold Absolute Pressure Sensor is a little though expensive device installed in your intake manifold, or installed

on the firewall and connected to the manifold with a thin hose. It has 5 Volts or 12 Volts coming in, and it simply senses the

vacuum in the manifold and attenuates (reduces, weakens) this incoming voltage by a certain factor. In other words it reduces

the supply voltage to a direct current voltage in the range of 15% to 60% of the supply voltage (depending on the car's design

these numbers will vary), and this varying (but non-pulsing) signal is then sent back to the computer.

The arrangement of resistors simply takes this already attenuated (reduced, weakened) signal – and attenuates it further. Too

much attenuation stops the engine; it will simply shut off. Yet if you control it correctly, you can lean down the mixture from the

balance of ingredients which is factory set at 14.7:1 (14.7 parts of air to 1 part gasoline) – down to 20:1 or so.
 
INSTALLING & TUNING
ATTENTION: The tuning procedure calls for clockwise and counter-clockwise rotation of the knob. The idea is that turning knob

will “enhance” or “reduce” the voltage.

The Enhancer can be installed on the dashboard or sit on the console. To eliminate the work and possible damage to the

dashboard, and to enable better control, place the box beside the driver’s seat. This makes tuning quite effortless.

Locate the 3 wires connected to the MAP sensor. There will

be one for the positive supply voltage, usually 5 or 12 volts.

The signal wire will be the wire with the WEAKER voltage and will

change with RPM when the engine is revved. There will also

be a ground wire. You can solder or crimp these with electrical

wire connectors.

To find the MAP Sensor Signal Wire, use a Circuit Tester like the one above to find the correct wire. You can hook this tester in

series with your multi-meter to find the actual voltage of the wires coming out of the MAP Sensor. The correct wire is the one

with the lowest voltage or the one with a voltage that varies when the engine RPM is increased.
 

ACTUAL TUNING ON THE ROAD

Turn the knob all the way to zero (The Dial should point to “0”). Make sure your HHO Generator is operational. Warm up the

engine and drive a while before experimenting with the knob. For speeds above 40 mph, adjust the “Highway” dial.

1. DO THE NEXT STEP WITH CARE – ON A SIDE ROAD - JUST IN CASE YOUR ENGINE STOPS UNEXPECTEDLY.

2. Now, start turning the knob clockwise; the mixture will turn leaner and leaner until the car stalls or bucks as you drive.

Back the knob off slightly after the bucking and chugging.

3. Keep the danger of overheating in mind. If your Hybrid Conversions device is non-operational, temporarily set the enhancer at

or near original factory setting (0).

4. Set points can change from one gas station fuel to another, weather conditions, cold engine, etc. The differences are not

large, but if you're on the edge, then the car will buck or vibrate, and you'll need to change the set point a bit.

Remember that this is a simple device.

5. NOTE: If this device turns on the "check engine light" while adjusting,  you can turn off the light using a

ScanGauge-II or an OBD-2 Connector (1996 cars or newer). Or Some vehicles can be reset by temporarily disconnecting the negative battery terminal.

 
MAXIMIZE BENEFITS
One recent set of road tests (6-16-07) averaged 52.4% better mileage. But, tests from a week earlier on the same car averaged

only 24.5%. Actually, 22% if you discount idling. WHY such great difference?

The secret of the BIG DIFFERENCE between the two test groups: The later and more successful one got MORE THAN

DOUBLE the average gain because the MPG was not dialed to near choke point. It was about ¼ turn closer to factory setting!

Don’t overwork the engine by leaning it too much – play around until you find the PERFECT BALANCE point.

 
Frequently Asked Questions
1. When should I use the “Highway” and “Enhanced” setting?

Answer: This unit can be switched to the original factory settings by putting the switch in the OFF position

and is used in this position for cold starts and where conditions such as passing, steep grades or any

situation that requires performance is needed. The Enhanced Switch position is used in conjunction with

the Highway - City Switch, and the Highway - City Potentiometers which are leaned in to achieve the best

mileage in respect to city or highway speeds. Use the “Highway” setting for speeds above 40 mph.

2. Will the Enhancer work on any make and model vehicle with a MAP Sensor?

Answer: It will work on MAP Sensors that operate by varying a voltage to the ECU. It will not work if the

MAP Sensor is frequency varied.

3. Will the Enhancer work with a MAF – Mass Air Flow Sensor?

Answer: If the sensor operates by varying a voltage to the ECM, it should work unless the MAF Sensor is

frequency varied. If it is see below.

Mass Air Flow Sensor Detail

The Air Flow Sensor or Mass Airflow Sensor (MAF) is one of the components of an electronic fuel injection

system and is found in many of modern vehicles. The Mass Air Flow sensor is usually installed inside the

intake air duct between the air filter and the engine. The Mass Air Flow sensor is used to measure the

amount of air entering the engine. This measurement is used by the engine computer or ECM to calculate

proper amount of fuel injected into the cylinders in order to provide optimum combustion and low

emissions. If your MAF Sensor is voltage varied, incorporate the MAF Enhancer to reduce voltage to the

ECM as normal.
****Some newer vehicles have a frequency based MAF sensor such as GM .
On this vehicle the sensor may not respond well to the enhancer. Some user have had success attaching this device to the  wire that has 5v dc on it.  The input to the controller will be from the car side and the output of the controller will go to the sensor.  Reverse of traditional voltage based sensors.( see picture below)

 
Note: The information contained in these instructions is for educational purposes only and cannot
substitute for the advice of professional mechanic or authorized dealer. ALL HHO Technologies assumes no responsibility for use or misuse of this product