Instruction Manual

LCU-ONE CAN connected to MXL QM and EVO3 QM

User Manual

Release 1.04

Chapter 1 – LCU–ONE

LCU-ONE is a lambda controller unit for the wide band BOSCH LSU 4.9 Lambda probe; it

fits petrol (2 and 4 strokes), diesel and methane engines as well as alcohol based fuel

engines. It is intended to check lambda probe proper working as well as to transmit the

Air/fuel ratio values providing MXL Pro/Pista QM (from here onwards MXL QM) and

EVO3 Pro/Pista QM (from here onwards EVO3 QM) with lambda values through the CAN

bus.

Lambda value is defined as: LAMBDA =(A/F)/(A/F) Stoichiometric

Where:

A= incoming part of air;

F= parts of petrol the carburettor introduces in the engine;

A / F Stoichiometric = parts of air needed to burn Stoichiometric F;

Gasoline, for example, needs 14,57 parts of air to completely burn a part of gasoline,

obtaining Lambda value= 1 read by the probe.

LCU–ONE controller can detect lambda values in a range from 0.65 to 1.6 (free air).

It is reminded that LAMBDA values lower than 1 means a rich mixture, while

LAMBDA values higher than 1 means a lean mixture.

Wide band Lambda probe need to be heated to work properly and not poisoned with

exhaust gas. LCU-ONE controller precisely manages the probe heater so to keep

temperature value within the optimum working range.

During its working period, Lambda probe used with LCU-ONE controller becomes very hot

(around 700-800 °C, 1292-1472 °F); it is thereby necessary AVOIDING:

• Touching it;

• Placing it in contact with flammable stuff or fuel.

Please note:

disrespect of these precautions can cause shocks, burnings or explosions.

1.1 – Part number

Kits part number are:

• Controller LCU-ONE (Complete kit with Lambda probe) X08LCU03K0

• BOSCH LSU 4.9 Lambda probe XO5LSU490