hey, im pretty much just about finished my turbo setup.. its a 1989 VN Calais.. Series 1 ive been looking into gas research a bit as the prices have dropped... im looking at a 510CFM single TB (the stock TB is like 500~cfm) Holden VN-VS V6 $1115.00 Holden VN-VT V8 (including 185kw & 215kw) $1043.00 Kits include the following : Throttle Body, Convertor, Lock-off valve, Adapter, Electric Primer, Brackets, Gaskets, Linkages, and Closed Loop Processor System and Idle Speed Control System where applicable. now, would i need anything else to deal with the fuel requirements how much can i expect to pay for this system installed ($2500-3000 incl parts???) they'res a place near me thats a installer for them i might pop in and ask.. the main reason im looking into straight gas is i want to avoid the EPA being on my ass and that stupid $3000 test is not worth it.. i can also remove my cat converter and also run the car for next to nothing im running 10psi intercooled at the moment but someday wish to run 15-20psi with forged internals any ideas guys??

Just watch the multi coil setup, due to it running a waste spark type ignition they are very prone to backfiring with LPG filling the inlet manifold, and a turbo could make this even more likely. Technically when running LPG there is no need for a cat, however the authorities will still request you run one when pulled over, as the current law does state that no emission controls may be removed or modified on any registered vehicle. The new range of Magic Cat convertors outflow a piece of 3" pipe so a good cat is not a restriction anyway.

Quote: Originally Posted by Morgz Just watch the multi coil setup, due to it running a waste spark type ignition they are very prone to backfiring with LPG filling the inlet manifold, and a turbo could make this even more likely. Technically when running LPG there is no need for a cat, however the authorities will still request you run one when pulled over, as the current law does state that no emission controls may be removed or modified on any registered vehicle. The new range of Magic Cat convertors outflow a piece of 3" pipe so a good cat is not a restriction anyway. ahh k cheers, yeah i was looking at a 3" cat... what about EPA and Straight Gas??? you VL boys probbly wont get as much crap as me about it, but EPA require a $3000 test to prove your not making polution, thats $3000 weather you pass/fail the v6s do back fire yes, they have a wetsuit material over a part of the airpipe which is fine for vaccume... however for boost its not... but backfiring is usually caused by fuel escaping back out the airpipe while trying to start as gas obviously has no return lines like petrol would a gas research system backfire??? usually only the mixer setups backfire due to where the fuel in introduced

From when I had my old gas vl, the emissions levels coming from the tailpipe were below the legal level when it was making 220rwkw so it should be fine, but the EPA does have access to better testing software and equipment than your average mechanic so I wouldnt be willing to bet $3k that it'd pass.. and the only reason you'd want it to pass is so it can be engineered, but as soon as you modify it beyond the scope of the engineers report, it becomes invalid anyway. Yep if the cylinder fires while the valve is open you'll know it! and simply by the way the v6's run, its more than likely to happen unless you tune it on the safe side or change the way it fires. GRA is as likely to backfire as much as anything else, its more to do with the tune, engine setup more than the gas parts used.

Ahh k cheers, well how likely are cops going to slap a blue EPA sticker on my car?? and what do i do if they do?? remove turbo?? i probbly wont get it engineered then, is it worth going gas??? the other reason was cheaper fuel... and changing the firing order of a v6 is alot of of work, well turbo cams are designed for minimal valve overlap to prevent boost from going walkabouts when both valves are open, this could prevent backfiring???

further more to that. look for an old carby as the new ones are poorer quality and apparently not setup for turbo's

ahh k well im starting to think its not such a good idea... if EPA still want testing then whats the point really but it would be nice to pay $30 for a full tank

Worst scenario you get done.. if you bluff your way out of it, Id say its unlikely to get referred to the EPA. You should pick up more power with a gas setup if done correctly, and the fuel consumption wont be any worse, its definetly worth persuing.. and next time we get a massive surge in fuel prices you'll be glad you did.

dont get scared, its a much better option and you're less likely to get reamed Some original photos have not been recovered yet.

mate i get %25 off petrol as it is :P i work for a big petrol company's headoffice.. yeah still all counts.. im gonna go have a chat to my local gas research installer, they have a dyno.. so if i get it done ill get them to power run it

well where's our discount lol. people usually come across the "gas" thing as off putting but in actual truth its a higher octane than petrol and if you're cunning enough put an adapter in there to connect a bbq bottle up to your line. its like running "premium man" lol plus if you run out of gas, all you have to do is buy a bbq bottle from a petrol station. Some original photos have not been recovered yet.

yeah i know the BBQ stuff is 115 octane and the butate/propane mixture is like 100-105 octane, haha its only for me as its rebate... im still going into the LPG shop to ask around gas is yeah a better fuel its just the way its introduced into the engine thats the problem, being its not a liquid unless compressed its harder to introduce efficiently

BOC sell straight propane from a normal fuel bowser

Quote: Originally Posted by Morgz Just watch the multi coil setup, due to it running a waste spark type ignition they are very prone to backfiring with LPG filling the inlet manifold, and a turbo could make this even more likely. Technically when running LPG there is no need for a cat, however the authorities will still request you run one when pulled over, as the current law does state that no emission controls may be removed or modified on any registered vehicle. The new range of Magic Cat convertors outflow a piece of 3" pipe so a good cat is not a restriction anyway. couldnt u just run a straight through pipe for the cat and tell em you have one?

yeah that'd work... i was talking to a exhust shop and they said you dont need one.. oh well defect is going away today soo ill find out more

lol you have finaly turbo'd your car man .. how quick do you think you will run ?

Quote: Originally Posted by KLR-747 couldnt u just run a straight through pipe for the cat and tell em you have one? nope.. Some original photos have not been recovered yet.

Have you considered gas injection, profire.com.au $2000 for the parts includung the management computer. They calim more power and better economy than petrol. Having owned a carby lpg car, they can be a nightmare to setup without flatspots, and chew through a heap of gas on boost due to the lack of tunability.