DIESELGAS CONVERSION

Installations

The DieselGas system is manufactured, installed and certified under the current Australian Standard AS1425. It is a similar installation to that of a petrol/LPG conversion. As the LPG is not required to meet the whole fuel demand of the engine smaller tanks can be used. This makes it easier to find space under the vehicle to install the tank. A gas tank of approximately 1/3 diesel tank capacity is fitted to the vehicle (a 30 litre gas tank is sufficient for 100 litres of diesel). A gas fuel gauge and switch is mounted on (or in) the dash. A LPG filler is fitted in a position convenient to the customer. All other components are mounted in the engine bay. The system can also be removed and fitted to another vehicle if required. All components are manufactured and tested to AS1425, as for any other LPG conversion. Once the system is fitted and you have completed approx. 1000kms (and kept accurate fuel usage records) we get the vehicle back to check the system and make any adjustments as necessary based on your feedback

Technical Information

What does it do?

This gas injection system utilises a sophisticated computer module that controls the flow of LPG into mechanical and electronic diesel engines whether stationary or mobile, turbocharged or naturally aspirated. The system operates by simultaneously burning diesel with a small quantity of gas resulting in a more efficient burn rate of 95%-98% (most diesel engines achieve around 75-85%). This increase in the burn rate results in less diesel being used to create the same outcome. Best of all, no engine modification is required, the system is non-invasive, operates completely independently, is simple to fit and can be fine-tuned to your requirements.

How does it work?

High-pressure liquid petroleum gas (LPG) is converted to a low-pressure (just above atmospheric) useable gas. The gas passes through a solenoid valve (or stepper motor) which is controlled by outputs from the system’s computerised processor measuring precisely the quantity of gas required. This metered amount of vapour travels through a hose into the vehicle air intake system and subsequently into the inlet manifold as a mixture of air and gas.

The computer module (processor) controls the flow of gas optimising performance and ensuring safety. Manifold pressure (via a MAP sensor) or throttle position (via a throttle position sensor) and engine speed are monitored. The module then adjusts the gas flow depending on engine load and driver demand. The amount of gas injected (or the ‘gas map’) is completely (and only) programmable by a laptop computer. This allows a large degree of flexibility to adjust the system to suit your requirements.

The system does not allow LPG into the engine at idle and is programmed to limit the amount of gas introduced at maximum load to prevent over-fuelling. The system shuts off gas flow when the brakes are applied or the driver’s foot comes off the accelerator.
The system can be switched on and off (if ever necessary) via a dash mounted switch. If gas is unavailable or you run out before a service station, it is not necessary to switch the system off. Instead you will notice a decrease in performance as the gas runs out. Since the diesel injection system is not modified, the vehicle will simply run on diesel as it did prior to the system being fitted

Range and fuel savings

As a result of the increased efficiency created by burning more of the diesel injected into the combustion chamber, less diesel is now required to travel each kilometre, therefore extending the range travelled on each tank of diesel. Or, to look at it another way, the same amount of diesel will deliver more power and torque. Documented evidence indicates net fuel cost savings of 10-20% are achievable running on either bio-diesel or normal diesel. A 4x4 vehicle will use approximately one litre of LPG for every 25-30 kilometres traveled under normal driving conditions. For further explanation, see Economy section. Power and Torque

This Diesel/Gas system will increase power and torque by up to 20% (sometimes more). This power increase is due not only to the increased combustion efficiency, but also the LPG itself produces power as it burns. So even the most economical gas map and driving technique will produce some additional power. A more powerful setting can still produce better economy than running on straight diesel.

This extra power is instantly noticeable from the moment the system is turned on. However, as the engine clears carbon deposits over time it is not unusual for the advantages of the system to increase.

The power and torque increase applies over the whole rev range. Turbo lag is all but eliminated, and engine noise and vibration is dramatically reduced all the way through to maximum revs. The driver will notice fewer gear changes and higher average speeds, particularly on hills and when towing.