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I've had my vapour sequential gas injection system fitted to my Disco II V8 now for nearly a year.
So far, it's been quite economical motoring. I had a problem with the fuel trims earlier on and was getting around 25 litres per 100 kms around town with standard tyres (although I have some heavy accessories on the vehicle) but now the economy is much improved after some tweaking.
Even at 25 litres per 100kms, assuming 50 cents a litre for LPG, it's still cheap motoring, as it will cost $12.50 every 100 kms to drive the Rover V8 around. In a TD5, at around 12 litres per 100kms in town driving, that equates to $15 per 100 kms assuming diesel is priced at $1.25 a litre.
I think my economy is now closer to 21 litres per 100kms after the tuneup.
I've had no backfires and the engine ECU works beautifully together with the OMVL Dream XXI system that I have (from SprintGas Australia).
Very happy with the system as it's far better than the venturi system (old style carby) that I once had fitted to my Ford EA Falcon.
The only big negatives about LPG are:
1. Loss of internal space if fitting an internal tank
2. Got to refuel every 280 - 300 kms - which can be a chore if you drive a lot.
Other than that, it works really really well. There's similar power to petrol and driveability is no different. I've found that I can switch to petrol with full accelerator depressed at 3800 rpm without any hiccup. It's a very transparent system - switching between fuels doesn't cause any problems and the system seems quite well developed - I do believe this is 4th generation LPG injection technology, so it's quite mature.
The decision to go with LPG is now a matter of finding the best installer who can do the neatest job and takes the most care in doing it.
Lawrance Lee
'99 DII V8 auto
Melbourne, VIC
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