> Home : Engine Management : DTA S40 ECU

All new race engine management system.


S40 PRO Overview 

The primary aim of the S40 is to provide an economic ECU for relatively simple wasted spark four cylinder engines using semi-sequential injection.

Maintaining the highest manufacturing quality and reliability of the more sophisticated ECU's in the S series range, it provides a lower priced solution for a wide range of applications.

 Essential features are not sacrificed to this aim. The S40 still maintains the important auxiliary functions that would allow this unit to be used on road vehicles (where required).

ECU Functions:

Engine Configuration

20,000 rpm capability

Flexible and easily adapted to different OEM, crank, cam sensor arrangements.

User controlled fan activation.

Sensors can be calibrated individually with a lot of preset options supplied.

Flexible Tacho Output.

Soft and hard rev limits.

Main Fuel and Ignition Functions

Comprehensive start up fuelling options both time and temperature dependant.

Air, coolant and manifold pressure compensation maps.

Throttle transient increase compensation.

Throttle transient reduction compensation.

RPM and load breakpoints can be calibrated by the user.

Throttle or MAP as load.

All maps with one or two dimensional with interpolation as required.

Lambda control functions

Extensive lambda parameters table to ensure stable closed loop operation and emissions requirements can be met where needed.

Full three dimensional lambda target map.

Auto-tuning function.

Turbo Control Functions

Open or closed loop turbo pressure control via PWM valve.

Modify target turbo pressure by gear selected.

Modify target turbo pressure by vehicle speed.

Two control maps selected by switch on dashboard.

Active base PWM map for easy calibration.

Idle Control Functions

Open or closed loop idle speed control via PWM valve.

Closed loop idle target speed temperature dependant.

Active base PWM map for easy calibration.

Fuel enrichment table calibrated versus PWM percentage.

Flexible Input/Output

Three uncommitted input tables which use 0-5 volt inputs or any input the S60 knows already, linked to fuel and advance modifiers and a PWM output.

Launch Control

Fully flexible first gear launch capability.

Extensively tuneable to individual vehicles.

Full Throttle Gear Shift Cut

Shift cut capability with 1ms resolution, variable for each gear with full switch de-bounce capability.

Voltage Compensation Tables

User configurable voltage compensation tables for injector dead time and coil on time (dwell time).


The ECU firmware is flash upgradeable via the serial port with a special cable and software. Current firmware and software published on www.dtafast.co.uk.

CAN PC Communications

The ECU can communicate with the PC via our
USB -> CAN converter. This solves the problem
of unreliable USB -> RS232 converters. Email us for more information.

Diagnostics and Test Features

Full sensor diagnostics and fault recording.

Extensive engine run time recording at different load and speed conditions.

Ability to exercise injectors and coils without engine running for fault finding.

Input and output features


Crank shaft (magnetic only)

Throttle position

Coolant temperature

Air temperature

Manifold / Barometric pressure


Oil pressure

Fuel pressure

Oil temperature

Battery volts

3x User defined analogue (shared use)

Launch switch

Shift cut

Undriven wheel speed


2x coil drivers

2x Injector drivers


Fuel pump relay

Fan / Aux2 / Turbo pressure valve (shared use)

Idle valve (shared second injector driver)

Shift light

Other features 

Sealed latching connectors 

Size: 115 x 100 x 41mm 

Weight: 268g

All outputs protected against over temperature and over current

Inputs protected against severe wiring mistakes and accidents

Reverse battery protection

Alternator load dump protection

S40 PRO wiring diagrams..
S40 Wiring Diagram.pdf

DTASwin V40.01 PC Software for S Series.zip

and instruction manual..
S Series Manual.pdf

all free to download and try.

Visit DTA fast http://www.dtafast.co.uk/index.shtml or email us for more information drew@roverdose.co.uk

  from my EBAY shop


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