Fed up with filling cost

[disco-ian]

Some science say its burn hotter some the other way round, AFAIK and I want to reply this AFAIK, the main reason for heads running hotter on LPG is BAD set up of LPG system causing engine run lean and for that reason hotter.

They was done quite accurate tests (by Polish LPG installers and enthusiasts) and they prove that PROPERLY installed AND set-up LPG system run like on petrol (temp wise) it was only a slight increase (on LPG) but it was within a measurement error (IIRC few degree) and definitely easy attainable while running on petrol.



LPG is especially beneficial on turbocharged cars, due to fact, its higher octane ratio is more resistance to knock which (as we all know) is the big issue on forced engines.


Here is another interesting example

Right on mate.

Wow what an engine.

[adaxo]

Hehe, its may not very scientific way, but what I can prove its that, few days ago I fill up my tank (5th or 8th one I cant remember) and instead of paying 80£ I paid 40£ so for saved 40£ I take my miss and daughter for a dinner today and it was left enough change for a bottle of Gordons and tonic, what else need to be prove ?? there are better things in life than burning money through exhaust.

[disco-ian]

Spot on the savings are clear.

I just want to get the best out of it long term but for now I am also happy with the savings.

V-power £6.35 per gallon and 27 mpg
LPG £3.54 per gallon and 23 mpg

Running on LPG I get the equivalent of 41 mpg for the money leaving my pocket and 280 bhp to play with lol.

[adaxo]

This is also worth a read

[disco-ian]

Lol another document and more conflicting numbers.

Different burn temps, auto ignite temps and octane ratings lol.

Mind you keep in mind that these are propane figures and I believe LPG is mainly a mix of butane with propane added only to stop the fuel freezing as it works down to a lower temperature.

Maybe have a search later for more figures on butane.


Sent from my iPhone using Tapatalk

[fassi1]

I still have my volvo S60 2.4T remaped to 250bhp with all the printouts from the dyno test, no differance in performance.
Lpg is higher octain fuel and boost is slightly higher on lpg.
That volvo does 0-62mph in 6.5s and 150mph on petrol and lpg, not bad for old people car and cheap fuel 72p a liter

[adaxo]

Any chance to paste yours Volvo dyno results here?? It will be interesting to see a difference (if any) between fuels.

[fassi1]

As far as i remember dyno showed about 3bhp loss but at some revs power and torque was the same.
All the data were monitored during the run and as i said boist was slightly higher on lpg.
Never needed to switch to petrol, never even thought about it.
Will try to paste the printout tonight.

[pezza]

volvo drives very well.. smooth power delivery feels like tip vr4...nice pickup/kickdown

[fassi1]

Yeah i've spend few quid on it and it's on ebay now

[Wodjno]

Yeah i've spend few quid on it and it's on ebay now

Linky :thumbup:

Sent via"The Force" using tapatalk :-)

[Wobble]

here

[fassi1]

Power and torque on the wheels

003 - petrol before remap
005 - LPG before remap
009 - LPG after remap
010 - petrol after remap

[disco-ian]

As far as i remember dyno showed about 3bhp loss but at some revs power and torque was the same.
All the data were monitored during the run and as i said boist was slightly higher on lpg.
Never needed to switch to petrol, never even thought about it.
Will try to paste the printout tonight.

Nice dyne graph showing the comparison. I'm hoping to do the same later this year on the VR4.

However you confuse me slightly by saying that there is only a 3bhp power drop on LPG however you run higher boost levels on LPG so surly there is actually a higher bhp drop as you are pushing the engine harder with more boost to get the bhp the same as one petrol.

Hey, its one way of doing it and I'm with you but..... isn't that cheating to get the same power output on LPG :-) Almost like saying you ron NOS with LPG to get the power output the same as petrol lol

[fassi1]

The difference was something like 0.03psi so tiny.
One important detail is, that LPG injectors on that Volvo were just enough to cope with the remap so i had to raise gas pressure on the reducer which didn't affect injectors performance as injectors Matrix HS are very good quality and very fast.
Bigger injectors may improve performence as the target under the max load and WOT is "petrol inj." = "lpg inj."