me and my friend always have this argument. just wondering. on a stock rb30 motor putting out about 117kw brand new, how much would you be looking at losing if it was on gas?

Why would u lose power converting to gas? I didnt.

Ive heard from tons of people that LPG doesnt put out as much power as normal unleaded. and my dads kingswood ute looses a bit when its on gas

gas is a higher octane fuel so it wouldnt loose power would it?

Quote: Originally Posted by aaron09_ me and my friend always have this argument. just wondering. on a stock rb30 motor putting out about 117kw brand new, how much would you be looking at losing if it was on gas? if you get a decent system that has the same tuning capabilities as petrol then you won't lose power, me personally i think it makes more power and thats a dedicated LPG setup on both cars LPG has a higher octane rating but a lower calorific value so you have the potential to run more timing and higher compression but you'll burn alot more for the cause so it depends what you want out of your system

as everyones said lpg has a higher octane rating but u also have to take into consideration that most lpg setups use a crude gas research carby style setup so you lose tunability in comparison with a setup where u can utilise fuel maps etc that being said there's alot of ignorance when it comes to performance lpg vehicles, just take a look around this section and you will see plenty of lpg cars making big power and running quick times you also mentioned your dads car which im assuming is dual fuel, its as simple as you cant tune a car to run 2 different fuels its either lpg or petrol, not both

Quote: Originally Posted by FORZA as everyones said lpg has a higher octane rating but u also have to take into consideration that most lpg setups use a crude gas research carby style setup so you lose tunability in comparison with a setup where u can utilise fuel maps etc that being said there's alot of ignorance when it comes to performance lpg vehicles, just take a look around this section and you will see plenty of lpg cars making big power and running quick times you also mentioned your dads car which im assuming is dual fuel, its as simple as you cant tune a car to run 2 different fuels its either lpg or petrol, not both yeah but look at what they have to do an how much money you u have to spend to get a gas car doing 10's... my mate converts cars to gas he say a normal gas set up that you get when u get a convertion done a normal daily driven car not a 10's car u lose about 13%.... ive got gas on my ute an i can feel the diff when its on gas then fuel

i dont think u read wat i wrote your car is not going to run well on 2 fuels and your obviously not going to run a 10 with those bodge (im assuming impco) single convertor systems they chuck in for a standard lpg conversion each metal lidded GRA convertor will flow around 200kw so twin convertors are needed to make the 300-350kw needed for a 10 on LPG, as well as twin lines, lock offs, tank and mixer theres your 10second fuel setup, everything else gets done the same as it would on petrol only thing u would need that you might not need on petrol, (but most would have anyway) is a decent ignition system like a CDI or ice system getting any car to run a 10 "reliably" isnt cheap regardless, but comparing cost of setting up LPG vs petrol for a 10 there really isnt too much difference

cheers for the info guys. i was just wondering cos the kingswood was sluggish. but it makes sense. not looking to run 10's atm anyway with a sotckie SL haha

Quote: Originally Posted by aaron09_ cheers for the info guys. i was just wondering cos the kingswood was sluggish. but it makes sense. not looking to run 10's atm anyway with a sotckie SL haha if you have a blow through mixer type setup forget fuel economy, the GRA throttle bodies have alot of tunability but are still a carby setup, the new liquid injection lpg fuel setups are going to be interesting to watch over the comming years

I have a Friend in Melbourne that has a VH sle with a 355 stroker engine in it. It was on dual fuel. We noticed a loss 20% power. Then he went for a Gas Research system which consisted of - Twin Gas throttle body's, twin K&N air filters, gas heads and twin gas pumps/converters and no fuel tank just a gas tank. This VH made 20% more power than petrol and much cheaper to run. http://www.gasresearch.com.au/home.html Also if you want to save valves using a standard head I'd recommend a valve saver kit. http://www.flashlube.com.au/en/valve...uid/index.html (http://www.flashlube.com.au/en/valvesaverfluid/index.html) The setup looked very much like this. http://www.youtube.com/watch?v=_e0t8kGdy-s

my dads 454 has a gas research ttb setup, straight.. i lost top end power however it has more very low, so it evens it up..

gas is for bbq's. lol

ive got a question guys, ive heard that if you have a turbo gas setup its bad for it to have compressor surge because apparently the car will "lurch backwards and forwards." when it surges? Is this true because i was 100% sure that GAS747 had comp. surge and ran fine Some original photos have not been recovered yet.

first ive heard of it.

biggest load of garbage ive ever heard, i was the dosing king Some original photos have not been recovered yet.

lpg is higher octane so you should gain power, BUT, on a blow through/carby style setup, LPG displaces oxygen that could enter the cylinder, so you're not burning as much oxygen every combustion. me personally, on my SprintGas blow through setup on my VLT, gained 3kw over petrol with the correct tune. i then proceeded to strip out petrol. Woggster - LPG will only lurch the car forwards if you have your mixer ring on the mouth of the turbo, as the flow of gas will be interrupted by the surge. If your mixer ring is on the COLD SIDE of the intercooler - close to the throttle body, this will not occur.