'Mountain' enhanced boost chips for the Elan

Introduction

My interest in tinkering with the Elan's engine management programming started back when I wrote ElanScan. Understanding the ALDL (assembly line diagnostic link) required much raking around websites with information concerning the modification of GM P4 ECUs. It is possible to download the contents of the Elan's 32kb PROM 63 bytes at a time via an ALDL command and so an algorithm was written into ElanScan to do this.

After lot of work reverse engineering the PROM the boost control code was been identified and the ability to reprogram the boost control system acquired.

A solenoid valve is installed in the wastegate acuator's feed line and by varying the proportion of time the valve is open (the duty cycle) the size of the leak, and therefore the boost achieved, can be varied. The ECU looks up a target boost, the value of which depends on engine RPM and throttle opening and varies the duty cycle of the solenoid valve to meet the target.

In this upgrade the tables have been modified to allow higher boost values to be employed – up to 0.9 bar. Two boost maps are offered here.

The Chips

A few characteristics of the chip are different to the original. First and foremost the boost targets are higher.
Boost map comparison

The chip's primary characteristics are listed here:

Stock Turbo Elan

Maximum programmed boost 0.65bar

Fuel cut limit 0.92bar

Boost pickup rate quite slow (boost lags behind target value under heavy throttle)

Nominal power 165bhp (flywheel)

Kilimanjaro

Maximum programmed boost 0.8bar

Fuel cut limit 0.96bar

Boost pickup rate enhanced

Dyno power 180bhp (flywheel estimated)

Everest

Maximum programmed boost 0.9bar

Fuel cut limit 0.98bar

Boost pickup rate enhanced

Dyno power 200bhp (flywheel estimated)

Elysium Mons (only on switcher boards)

Maximum programmed boost 0.95bar (mid-range only 0.9bar at high revs)
Fuel cut limit 1bar
Boost pickup rate enhanced
Dyno power 200bhp (flywheel estimated)

The ECU solution leaves all the safety features enabled:

Boost is limited to 0.5bar when:

the coolant temperature is below 50°C

any fault code is set

The boost is progressively reduced if knock retardation exceeds 5°

Money back if you don't like it

If you send an undamaged kit back within 30 days, for any reason, you'll get a full refund minus postage & packing costs. All UK orders are sent recorded delivery.

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'Mountain' enhanced boost chips for the Elan

Introduction

The Chips

Money back if you don't like it