LPG (Autogas) Conversion information? - Toyota Prius Forum : Prius Online Toyota Forums
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post #1 of 11 (permalink) Old 05-01-2006, 09:03 AM Thread Starter
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Default LPG (Autogas) Conversion information?

Hi,
Here in the jolly old UK, petrol prices are soon to top GBP5 (USD9.1) per imperial gallon (1.2 US gallons).
As a result, there has been an upsurge in interest in LPG (Autogas) conversions for all sorts of cars, including the Prius. LPG is approximately half the price of petrol.

I am currently waiting for delivery of my 2006 Prius.

Before converting it to LPG, I wanted to know if any other forum members have come across any substantiated claims to increased valve wear on the Prius as a result of the conversion?

I have spoken to a representative from Toyota UK regarding the conversion, and received the normal non-committal "Er, um, I cannot recommended it."
He was reluctant to say whether valve wear would increase... or not.

I have received assurance however, that non-LPG related engine failures will still be under warranty, and have been given an address to write to at Toyota so that I can get confirmation of this in writing.

Any information regarding LPG-related wear and failures would be gratefully received.

Regards,
Sue.

2006 T-Spirit
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post #2 of 11 (permalink) Old 05-01-2006, 10:34 AM
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I haven't heard of anyone doing it. It uses a similar engine as the Echo (same block), so you can start with any info you find for the Echo. Granted, the Prius uses a different valve system than the Echo, as it uses a variable intake valve timing to create the Akinson/Miller cycle.

Also, depending on the fuel/air mixture ratio for the LPG compared to gasoline, you might get a check engine light even if everything is fine if the ECU has to overcompensate for the F/A mixture. The same thing happens for E85.
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post #3 of 11 (permalink) Old 05-01-2006, 07:13 PM Thread Starter
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Dear DanMan32,
Thanks very much for the reply.

There is one company in the UK, Nicholson-McLaren ( http://www.nicholsonmclaren.com ) that is "pioneering" the installation of LPG systems into Prius cars.
Another company, http://www.prinslpgnetwork.com, has said they can happily do the conversion.

Both companies offer sequential injection systems, but I understand that Nicholson-McLaren have actually converted several Prius for Taxi companies, but there is, as yet, no data available on accelerated valve wear... or the lack of it.

Thanks again for your reply. If anyone else has any data, I would be very interested in it.

If anyone else is interested, I'll be getting the LPG conversion done at the end of July, and can post my experiences here...?
I will probably getting the conversion done by N-M as they build racing engines from scratch and (I think) are probably more likely to know what they are doing... {gulp!}

Regards, Sue.

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post #4 of 11 (permalink) Old 05-02-2006, 08:27 PM Thread Starter
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Just a quick update...

I had a phonecall yesterday from a representative of Fuelture ( http://www.fuelture.com ), a company who is also involved in fitting LPG systums to Prius cars.

Fuelture has been liasing with Nicholson-McLaren on my behalf, and have come up with the following advice -

Fuelture have just had three Prius cars converted by N-M to be run as LPG/Petrol/Battery hybrids in London.
It is estimated that these cars will cover a minimum of a 1000 miles a week. The hope is that within 3 to 4 months there will be some meaningful data available on the possibility of accelerated valve and seat wear.
It was mentioned that several models of Toyota are very susceptible to this problem, and that the Prius currently is an unknown.
Another Prius was converted about a month ago and has done 6000 miles with no noticeable problems thus far...

As a result of a lack of concrete data one way or the other, Fuelture have advised me to wait at least three months before applying to have my Prius converted - basically until they know more.

The cost of having wear-resistant valves and seats fitted (in the UK) was quoted as being between 1,000 to 1,200.

Regards, Sue

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post #5 of 11 (permalink) Old 05-02-2006, 10:06 PM
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post #6 of 11 (permalink) Old 05-04-2006, 07:39 PM
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I've heard of at least one Prius fitted with LPG. Check on the Prius-UK yahoogroup ( http://autos.groups.yahoo.com/group/Prius-UK/ ), I believe it was Chris (j244x4) who did it, and offered it on eBay.




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post #7 of 11 (permalink) Old 02-18-2007, 01:07 PM
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I was just wondering how you got on with this as i was thinking of having mine done.
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post #8 of 11 (permalink) Old 03-27-2010, 07:15 AM
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Default LPG Autogas Conversion information

I have 2 vehicles on LPG which when I bought them, already had the conversion on them. The cars actually use more litres of gas over the same distance than they would on petrol, but it is the much lower price that makes it soooo much cheaper.

As the main fuel used is LPG in any converted vehicle, you are right....most are tuned to run better on the LPG than the petrol. However, they will still run OK and most still start on petrol before automatically switching to LPG a few seconds later. Most people are advised to still keep at least a quarter of a tank of petrol for this purpose, and to also run the car on petrol for a short distance a kilometre or so once a week to keep the fuel system healthy.

Converting a car to LPG however can be expensive and I have heard from a family member that it can be about 2-3years before you get the cost of the conversion back in savings from the LPG price.

In regards to any price rise in LPG however....who knows Anyone got a crystal ball that works? Mines looking a bit cloudy
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post #9 of 11 (permalink) Old 05-11-2010, 03:11 PM
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Default Re: LPG (Autogas) Conversion information?

I've had my Jaguar XK8 and a previous Hyundai Santa Fe converted to run on LPG in 2005 & 2006 at that time LPG was 35ppl now average is 63ppm (although I still fill up at 57ppl)

The Jaguar was mainly used for business/motorway miles and the 30k miles covered the first 12 months paid for the 2k conversion cost...so everything now is a bonus!. The 4x4 used for weekends an lugging heavy loads and due to the low miles I sold it and didn't make a loss on 2yrs of ownership because of the conversion :O)

No problems whatsoever still have the Jag and it runs beautifully, the added benefit is that it is MOT tested as LPG so I've decatted it freeing up an extra 20RW brake. So keep half a tank of Tesco Super for those moments when I want superb take-off and LPG for the remainder. I can cover 320 miles on a 62 litre fill tank which costs me 35 which based on the price of unleaded being .1.20 ppl means in real terms I'd need a petrol car that delivered better than 65mpg and I get to make a daramatic entrance in a 4.2l V8

Regards

Mark

PS: Reason I joined up is I am about to buy a fully loaded late 2009 Prius so would be interested how prius conversions have gone and the largest fill tank available?
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post #10 of 11 (permalink) Old 10-18-2011, 08:38 AM
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Default Re: LPG (Autogas) Conversion information?

Hello, please let me know, if anyone received more information regarding impact on engine after converting Prius to LPG. Thank you
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