Endrust Geraldton now offers LPG conversions for common makes of cars.

       Dave has added his comments below.



Here at Endrust we have converted over 200 vehicles to LPG. This may not sound like a lot, but considering a properly installed conversion takes about 3 days to complete - this is a lot of work and experience.

Dave had worked in the past for a workshop specialising in LPG engines; when LPG installation was given a $$$ boost with government incentives, our workshop turned its attention to this market. As quality is our constant concern, we used full Sprint-Gas conversion kits where possible (i.e. about 90% of the time). These systems can be serviced by any of the numerous Sprint-Gas installers around the country. Recently we have included Emer kits, thus expanding the range of vehicles we can convert. You will find a list here.

Some of the benefits of the Sprint-Gas conversions include:

  • LPG is a vapour fuel. It does not wash the lubricating oil off your piston walls inside your motor. So your engine last longer and stay cleaner.
  • Vehicles built from 2004 onwards have "set and forget" features, meaning no input is needed from the driver.
  • High quality units, mean low additional servicing costs.
  • Injection LPG systems make back-firing impossible.
Some LPG benefits include:
  • Fuel savings, this is about $40 per tank with an average 6 cylinder engine.
  • With the extra fuel tank your car will have a greatly increased range. Just think, over 1200 km, gives you greater flexibilty on where you refill your tank.
  • Greener Fuel - LPG has a higher octane rating than than unleaded fuel and is thus a cleaner burning fuel. This alone should give you an incentive to make the switch!
  • The Federal Government offers $1500 rebate for conversions. We do all the paperwork and supply you with the necessary forms.
  • The LPG fuel is from Australia and thus benefits Australia.
Additional LPG Information
  • Injection systems cause very little power difference.
  • By contrast, LPG enhancement to diesel vehicles significantly improves power and economy; usually around 20-25% for turbo diesel and 10-12% for non-turbo (more below).
  • Our installations are tuned, where necessary, using our in-house chassis dyno; to give optimum economy results.

If your car is privately owned (not leased) then you are entitled to the $1500 Government LPG rebate *. A standard conversion with no exhaust changes could be as low as $1700 (including rebate). As a thorough conversion take about 3 days we can offer you FREE use of our courtesy car**. * One rebate per licensed driver every 3 years. **No usage charge, 40 km free, then 20c per km.

LPG kits are available for these petrol vehicles. For further details contact us.


For over 40 years, industries have been adding LPG to the intake of their diesel engines. Adding small amounts of LPG lifts the volatility of the of the oxygen. This aids the combustion of the diesel engine and produces more power. The results are improved economy and a cleaner tail-pipe. In addition, the LPG adds energy to the combustion process causing an increase in torque (pulling power). This especially improves the fuel economy, for vehicles with poor aerodynamics, and vehicles used for towing.

The Dyno Graph shown below is for a Nissan Navara 3.0 Turbo. In this graph, you can see that the "diesel only" peak horsepower is reached by the LPG assisted fuel fully 30 km/hr below the old peak speed, thus less fuel is consumed as the engine is producing its required power at much lower Revs Per Minute (RPM).

The above gaph also shows a yellow shaded section, this indicates the overall increase in available power. The peak power is increased by 31%, with a spectacular improvement right across the higher RPM band.

Other benefits include:

  • More power and torque means less gear changing on hills.
  • Better fuel economy increases the range of the vehicle.
  • Less Carbon waste in the exhaust means that the engine oil stays cleaner for longer.
  • Environmentally friendly LPG reduces NOx to around 1/10th and particulates to about 1/20th of previously recorded levels. This is a marked improvement for tailpipe emissions.
  • No intrusive LPG gas tank, as they are usually fitted underneath the vehicle, retaining valuable boot space.
  • Should you run out of LPG, the vehicle still runs on diesel just as it did before conversion.

The essence of how the system works for diesels is as follows:

  • At idle no LPG is used, as diesels run extremely lean mixtures when idling and LPG would not give any significant improvement.
  • As you accelerate,the LPG is injected into the air stream. Diesel engines accelerate because of an increase in fuel being fed into the cylinders. (By contrast, petrol engines accelerate because of an incease air caused by opening the throttle butterfly valve.) The speed at which diesel ignites is crucial to the power produced. Adding excessive fuel leaves unburned fuel in the exhuast, producing smoke (unburned particulates). Similarly fouled injectors produce smoke.
  • LPG is injected as a gas and has similar burn characteristics to diesel fuel; this improves the air intake and ignition characteristics to produce a better flame front. Any load on the engine increases the fuel mixture ratios to a predetermined level within the fuel injection pump. With LPG more of that fuel is burned.
  • On deceleration the pressure difference between the intake and the LPG feed line activates a switch that turns the LPG injection off and the engine reverts to diesel only, thus conserving the LPG.
  • Towing a caravan, or carrying heavy cargo puts the engine in a continuous load condition. This is the kind of driving where sustantial fuel savings will occur. Economy can be tricky to record, especially with exhilaration of running a higher power engine, but gains of 20% are common when towing.

For further details contact us.

Home | Index | Contact | About Us