Techy Q- Engine mapping..

[Zico]

Hoping some tech savy guys on here might be able to offer some advice..

We finally chose the new powerplant for the new Grp4 Escort, its a JRE (John Reid Engineering) long stroke, 2.3 Vaux XE 16V, all steel internals, Big valve touring car head running on Jenvey TB's through a fully programable DTA ECU and produces 293bhp with aprox 230lb/ft torque.

The ECU has been mapped but Im gonna build a carbon fibre airbox which will remove hot air scavenging and add a degree of Ram effect at higher speeds.

Q- Will this Ram effect be significant enough to create a dangerous lean burn situation at higher speeds of 100-120mph ?

Significant enough to warrant adding an air flow meter (as per turbo'd engines) to the intake, overlaying the standard map with the airflow map to make it 3 Dimensional ?


I doubt it will be required but I'd just like to be sure..

Thanks.

[airshifter]

The only way to know for sure is the use of an onboard wideband O2 sensor and data logging. There are way too many variables to predict how it will flow at different speeds.

I'm assuming that the engine build does not use a mass air sensor but rather a speed density system?

[Zico]

We havent recieved delivery of the engine yet all I know is that the ECU is a DTA "pro" model, here are the capabilities of the most basic model... so it will have a manifold presure map at least..

Engine Configuration

20,000 rpm capability
Flexible and easily adapted to different OEM, crank, cam sensor arrangements.
Genuine four and two stroke support.
Twin injector engines.
Semi - sequential injection.
wasted spark or distributor.
User controlled fan activation.
Sensors can be calibrated individually with a lot of preset options supplied.
Flexible Tacho Output
soft and hard rev limits



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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.


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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.


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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.


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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.


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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.


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Launch Control

Fully flexible first gear launch capability.
Extensively tunable to individual vehicles.


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Full Throttle Gear Shift Cut

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


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Voltage Compensation Tables

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


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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.


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Other Features

Sealed Latching Connectors

Size 115 x 100 x 41 mm

Weight 268 gm

All outputs protected against over temperature and over current

Inputs protected against severe wiring mistakes and accidents

Reverse battery protection

Alternator load dump protection