Technical card :20-08-2007

Updated :21-05-2008

Article :A-451

RPM amplifyer
Application :It is an electronic amp with microprocessor which adapts the RPM signals coming fromnearly all types of engines on ALFANO data acquisition systems.

Installation- « RED (+) » and « BLACK (-) » wire supplies power to the module :Connects to the positive and negative (12 Volts) of the battery. Length 450cm / 177.1inch- « GREY » wire is the RPM transmitter :Connects to the ALFANO : Port « G ». Length 100cm / 39.4inch- « YELLOW » wire is the RPM signal sensor :Connects to the engine ignition. Length 450cm / 177.1inch

Red LED lighting up for
RPM presence signal

Wire carrying RPM signal of the vehicle(wire colour depends on manufacturer)

The configuration is done at this placewith the little magnet.

Fuse box with fuse to connect
to (+) of the battery« Yellow » wire Module« Red » wire (+) Module« Black » wire (-) Module

Cable terminals to set

The installation procedure has 4 stages
I.

Installation of the A451 module onto the vehicle

II.

How to find the RPM signal on the majority of ignitions

III.

Configuring the A451 moduleIV.

Configuring the ALFANO

I.

Installation of the A451 module onto the vehicle

1)

Connect the red (+) and black (-) wires to the battery or to the vehicle power circuit with the fuse box.

2)

Connect the « Grey » wire (RPM transmitter) into the « G » port of your ALFANO.

3)

Finally, look for the wire carrying the RPM signal on the vehicle ignition to connect the « yellow » wire.

IMPORTANT- Avoid to install the module to close to the engine.
- Install the A421 onto the vehicle, close to the ALFANO.

II.

How to find the RPM signal on the majority of engine ignitionsA) Traditional high voltage coil :Connect the “Yellow” wire of the A451 module to the negative terminal of the coil.

« Yellow » wireB) High voltage coil (twin static type) with 2 wires and more :A single wire is capable of providing you with the RPM signal on the majority of ignitions. You have to locate it to connect electricallythe RPM sensor to the “Yellow” wire of the A451 module.

Tip: to avoid damaging the insulation of the wires connected to the coil when looking for theRPM signal, use a (sewing) pin and stick it into one of the wires: make sure the pin pierces thewire right to the centre to obtain electrical contact. Strip the “Yellow” wire of the A451 moduleand twist it around the pin. BE CAREFUL of short-circuits.
Turn the engine over at idling speed and watch the red LED on the module (see page 2) : theLED will light up when in contact with the wire carrying the RPM signal. If this does not
happen, repeat the operation on the other wires until the red LED lights up.

C) High voltage coil located on the spark plug, with 2 wires or more :Those wires come from the electronic case. ATTENTION: the connection has to be done on the electronic case side and not on the coilside.
The procedure for looking for the wire carrying the RPM signal is the same as that described for the (twin static) high voltage coilabove.
D) Electronic computation unit:
On electronic units, such as GM, HEI or MSD, you will find a special terminal “TACH” : connect the “Yellow” wire of the A451 module toit.

« Yellow » wireElectronicComputationUnitTo guarantee long-lasting operation, carry out the wiring correctly in accordance with automobile standards.

III.

Configuring the A451 module

Once the module is installed, it must be configured.
1) Turn the engine over at idling speed (DO NOT ACCELERATE)
2) Then, just put close to the RPM amplifyer during 2 seconds a little magnet (see page 2).
IV.

Configuring the ALFANO

This operation is to ensure the RPM is displayed correctly on your ALFANO.
1) Turn the engine over at idling speed (DO NOT ACCELERATE)
2) On the « RPM » menu of your ALFANO, use the right-hand button to select the correct unit to display the right RPM.
On the versions :PRO+ (V1.05.00)
AStrO (V2.05.00)
AStrO formula 4T (V4.05.02)

A-141
A-151
A-162

The following units are available :(/8) (/4) (/2) (X1) (X2) (X4) (X8)From the versions :PRO+ (V1.05.06)
AStrO (V2.05.06)
AStrO (V2.05.06)
AStrO formula 4T (V4.05.06)
PRO+ LV
AStrO LV
AStrO formula LV

A-141
A-151
A-152
A-162
A-145
A-155
A-165 (integrated amplifyer)

The following units are available :(/10) (/8) (/6) (/5) (/4) (/3) (/2.5) (/2) (/1.5) (/1.25) (X1) (X1.33) (X1.6) (X2) (X4) (X8)

These units will divide or multiply the impulses from the RPM module and the result will be displayed above and on the right of thescreen. If you know your idling RPM, all you have to do is find it on your ALFANO.

ATTENTION :when fixing, take care to move away the most possible the wires of this amplifyer from the other wires, mainly
from the type : RPM, high tension of the ignition system wires, to avoid reciprocal interferences.

Adjustings

PRO+ / A141
PRO+ LV / A-145

AStrO / A-151
AStrO 4T/ A-152
AStrO LV / A-155

AStrO fomula 4T / A-162

AStrO formula LV / A-165 (integrated amplifyer)

We apply a method of continuous development. Therefore, we reserve the right to bring changes and improvements to all products described in thisdocument, without preliminary notice. Consult our website regularly www.alfano.com in order to be informed of the last news and/or changes.