LPG conversion on a GTI

[Bubu]

I didnt think anyone would want to do such a thing. It turns out I was wrong.

http://www.polo-gti.com/topic,2137,-gti-ch-s-lpg-polo.html

[leasaunce]

that's a small tank! wouldnt go far with that amount. but i like how everything is flush!

[Whubbsie]

this is kinda pointless isn't it?

[pologti18t]

this is kinda pointless isn't it?

Is it? I read a road report of a LPG converted Megane RS 225 (in the UK). Performance was unaffected and the running cost was LESS than a diesel car. Why wouldn't you do it?

[neil]

Is it? I read a road report of a LPG converted Megane RS 225 (in the UK). Performance was unaffected and the running cost was LESS than a diesel car. Why wouldn't you do it?

Put this on a diesel car and the running cost would be less than any petrol car on gas.

[Whubbsie]

Is it? I read a road report of a LPG converted Megane RS 225 (in the UK). Performance was unaffected and the running cost was LESS than a diesel car. Why wouldn't you do it?

Not particularly swayed by the argument, I'd have to see some significant saving for me to think it was a good idea which I can't see there being. Its not like the polo is expensive to run to begin with.

[gerhard]

Note that the Polo GTI is a 4 door

That tank is great - with a bit of careful redesign and Bandag, it could double as the spare wheel.

Also note it can run on LPG and CNG, which opens the possibility of home filling from the mains.

[Stuwey]

Lets not forget the Octane of LPG is much higher than our pump fuel, so if you really wanted, more power can be had.

LPG isn't just for barbecues!

[Bubu]

Lets not forget the Octane of LPG is much higher than our pump fuel, so if you really wanted, more power can be had.

LPG isn't just for barbecues!

Correct me if I am wrong, but even though the octane rating is higher the energy content of LPG is lower.

[RedMk2Gti]

Correct me if I am wrong, but even though the octane rating is higher the energy content of LPG is lower.

That's why LPG consumption is higher.

Diesel vs Petrol -> low consumption but high price
LPG vs Petrol -> high consumption but low price.

You need to find the point where they break even.

I recently converted another non-VW car in my family to LPG, my calculation shows LPG consumption is 41% higher than petrol, with petrol price going down hill, if petrol price fall into 90c per liter mark, there isn't any difference in my fuel bill.

[gerhard]

That's why LPG consumption is higher.

Diesel vs Petrol -> low consumption but high price
LPG vs Petrol -> high consumption but low price.

You need to find the point where they break even.

I recently converted another non-VW car in my family to LPG, my calculation shows LPG consumption is 41% higher than petrol, with petrol price going down hill, if petrol price fall into 90c per liter mark, there isn't any difference in my fuel bill.

All of this is correct, but the latest LPG direct liquid injection systems are now producing the same power level as petrol, with increased usage down to 10-12% rather than the 41% you are seeing. Direct injection reduces the "waste" of conversion to gaseous form and can inject a precise dose that is computer controlled. These systems offer excellent driveability.

In my experience, a lot of people running LPG fool themselves about how much extra it can use, and can get really edgy if you press the issue Clearly you aren't one of them.

Petrol at .90 ? Mmmmm. Part of me would like to see it, part of me does not want to.

[RedMk2Gti]

All of this is correct, but the latest LPG direct liquid injection systems are now producing the same power level as petrol, with increased usage down to 10-12% rather than the 41% you are seeing. Direct injection reduces the "waste" of conversion to gaseous form and can inject a precise dose that is computer controlled. These systems offer excellent driveability.

In my experience, a lot of people running LPG fool themselves about how much extra it can use, and can get really edgy if you press the issue Clearly you aren't one of them.

Petrol at .90 ? Mmmmm. Part of me would like to see it, part of me does not want to.

I'd really really doubt that 10-12% figure unless someone have solid statistic from their own car. Before I done my LPG conversion, I've read plenty of forum discussion about LPG usage, in general people are talking about 25-30% increase for convertor/mixer system.

[Pumpe-Düse]

41% higher using LPG? Sounds like something is wrong with that car...

My old man and I are in the cab business... the biggest discrepency with non-LPG injection setups I've ever seen is a 20% consumption increase.

[gerhard]

I'd really really doubt that 10-12% figure unless someone have solid statistic from their own car. Before I done my LPG conversion, I've read plenty of forum discussion about LPG usage, in general people are talking about 25-30% increase for convertor/mixer system.

As I said, DIRECT INJECTION LPG systems are achieving equal power for 10-12% increase in consumption.

Converter/mixer systems can't get anywhere near that, either in power or consumption, since the vehicle ECU is not used much, if at all.

In direct injection systems, the vehicle ECU adjusts timing, etc according to whether the injectors are feeding petrol or LPG, and the LPG is fed as precisely as petrol. That's why they are achieving such impressive results.