I did promise an update, so here it is.
I've already invested heavily in the project, although LPG is not normally associated with this type of car I see no reason why it shouldn't work very well if I can get the installation and packaging right.
So for those interested, essentially I'm halfway there.
Four months ago a Canems Fully Programmable Dual Fuel Petrol-LPG ECU was fitted & mapped by Lloyd Specialist Developments.
On the face of it this looks like a very expensive rout to LPG, however as I already had intentions to replace the Lucas 14CUX & distributor it made sense to select a system that could also facilitate my dual fuel plans.
I see the Canems Dual Fuel ECU as a foundation for my conversion.
The installation included removing and replacing the 16 year old engine bay loom with a bespoke harness, this made for a much neater installation & should significantly enhance reliability.
Since the installation I've completed 4,000 evaluation miles (petrol only), the system has already proved itself to deliver three significant & very noticeable advantages over the old Lucas 14CUX & distributor.
1. Vastly improved throttle response
2. Increased torque
3. Improved fuel economy
Designed to fire the petrol injectors on map 1 & low impedance LPG injectors on map 2, the ECU is a single body unit sharing the same engine sensor inputs for both fuel types.
A separate output socket is provided for each fuel type & no additional piggyback ECU is required.
Unlike a piggy back the Canems dual fuel ECU is not manipulating petrol requirements to generate a second hand map for LPG; both petrol & LPG maps are completely independent of each other.
This removes a significant compromise & means both fuels can be precisely mapped to accommodate their very unique requirements, if mapped correctly the theory is it should allow for optimum performance on petrol & LPG.
Key features of the system are:
• Map switching facilities
• Automatic injector swapping and solenoid operation
• Enhanced dual-fuel settings
• 8 Peak and hold injector drivers
• Sequential LPG Injection Control for 8 Cylinders
• LPG Solenoid Control
• Two Switchable 3D Fuel Injection Maps with 252 programmable sites
• Two Switchable 3D Ignition Timing Maps with 252 programmable sites
• Semi-Sequential Fuel Injection Control for 8 Cylinders
• Wasted Spark Ignition for 8 Cylinders
• 2 Wide-band or Narrow-band Lambda Inputs - with Closed Loop Control and 3D Target Air-Fuel Ratio map
• Built-in Coil Control (no external modules required - e.g.: EDIS)
• 12000rpm capability
• Programmable Hard and Soft Rev Limiters
• Programmable Shift Light output
• Programmable Correction Maps for Coolant Temperature, Air Temperature and Cranking
• Programmable Transient Enrichments
• Staged Injector Control
• 3D PWM Output - with 252 programmable sites - ideal for open-loop Boost Control
• Further Output - currently controlling the rad fans
• PWM valve and/or Spark Scatter Idle control
• Closed Loop Idle control
• All settings Real-Time Programmable
• Adjustable Coil Dwell Control
• MAP Load Sensor
• RPM input from VR Sensor
• Data-logging of up to 24 optional parameters, with adjustable recording rate
• Diagnostic Recording of Max. / Min. Inputs and Outputs
I have also added an AEM Wireless System that allows me to monitor air fuel ratios under varying load conditions on the move, viewed on a wireless enabled IPod Touch or Ipad.
This system also has the facility to also show exhaust gas temperatures on both banks.
The Canems dual fuel system has already proved itself to be a big step forward over the 14CUX & distributor, in theory it should also make for a neater and more efficient conversion to LPG than the traditional piggy back ECU.
Prins VSI LPG front end components have been selected for their quality & reliability, the tank location & size has been designed with the following in mind:
• Optimum safety
• Best weight distribution
• Roof panel storage in boot retained
• Useful luggage capacity retained
• LPG touring range of 300 miles
Bringing all these elements together with minimal compromises has been challenging to say the least, I plan to complete some final mock ups in the next few weeks to establish the optimal set up.
I'm currently in the process of choosing between two potential fitters, pleasingly both are showing equal enthusiasm for the project.
My objective is to see the car running perfectly on both fuels by early 2013.
Wish me luck