going LPG

[kaisersolsay]

There is a RS 6 already with LPG and it made more power with LPG then without at the MRC dyno day...

Yes we know its been done before

But not in this way with 16 high flow brc injectors and a load of other bits and pieces.. Having a twin bank of injectors will give massive fueling potential if i want to go down the manual route in the near future

Are you on commission rebate from BRC by any chance?

[kaisersolsay]

[quote="Gravitypilot"][quote="kaisersolsay"]
Your mates x5 would do less than the 540i becuase aerodynamic as a skip and much heavier .. Prob 16/17mpg on gas price equivalent of around 35mpg

As I said.....he gets 35mpg using gas. Is there an echo in here?

[Gravitypilot]

Your mates x5 would do less than the 540i becuase aerodynamic as a skip and much heavier .. Prob 16/17mpg on gas price equivalent of around 35mpg

As I said.....he gets 35mpg using gas. Is there an echo in here?

To be fair.. You said 35mpg using gas..

Most people would take this as it was said, when if fact only 16/17 mpg on gas but the pricewise similar to 35mpg

I can get all systems for at cost but from my experience brc are by far the best

[kaisersolsay]

Keen to see you work Grav....you should market your own kit once installed. I'm sure there would be a market.

[Gravitypilot]

Keen to see you work Grav....you should market your own kit once installed. I'm sure there would be a market.

well im going to get things in motion after xmas etc probs start work early feb...

im just really reluctant to relocate the battery and the tool kit etc out of the wheel well, i will not like changing much stuff on it!


these things always cost more than you plan they will and we will see how much of a pain in the arse it is on an rs6...

i dont have a problem changing the filters for cones... does anyone have any links for cone/induction kit filters?


the bad thing about the cone/filters is they cause premature failure of the mafs i think becuase of the oil in the filters...

but cone filters might give a power increase if i can get some cold air feeds upto them perhaps hmmmmm

[Monaro-Azz]

Have you considered using Liquid phase LPG injection? Gas phase is old tech now.
With liquid phase you get proper metering so you only use approx 12-15% more gas than petrol compared to 25-30% for gas phase.
You Also gain the inherent benefit of the reduction in intake temperature as the liquid converts to a gas drawing temp out of your intake charge(254/1 rate of expansion IIRC= big cooling).
In Australia there is a very large aftermarket performance LPG trend with big numbers being made with Liquid phase injection(2500hp from a 7.4L TT V8 on gas). It also helps that the government gives $2,000 towards every LPG conversion.
What they are finding is you can get more power out of a LPG car than the same car on petrol as long as you can accurately meter the supply(due to LPG having a high octane rating-approx 112/115 but low calorie content).
The only downside is the cost as every part is different to a gas phase system due to gas phase being low pressure and liquid phase being very high pressure.
My brother is even running it on his 900hp diesel Chevy where the LPG adds about 150Hp of the total.
I can probably did up some links if you want me to?

Aaron,

P.s. I forgot to mention the LPG takes it's injectors pulse input directly from the cars ECU so you can tune the car as per normal.

P.P.S I have absolutely nothing to do with the LPG industry, just trying to throw good ideas out here.

[Gravitypilot]

Hi Aaron,

what you are talking about is the modern LPG injection system... the old school systems were single point injecton like they used to fit on the old range rovers etc..

modern systems Like BRC are sequential injecton, 1 injector per cyclinder ... or if you are greedy you can double up the injectors...

i am still pondering whether i dare do this to my 6 or not.. u did say i was going to start work at the end of feb... but still thinking about it!

ultimatley cars will do about 20% less MPG on LPG and the governement has started loading LPG so its chasing petrol now

[Shoppinit]

What kind of costs are you planning on?

What about long term reliability issues? My Rangey blew a piston on LPG so now I'm very cautious. Was a mickey mouse LPG system though and I suspect the mixture was way too lean most of the time.

Do you use a special ECU? How does it handle the turbos and ignition timing, etc?

[Gravitypilot]

not sure what the costs will be yet.. i have friends still in the trade with the brc system so if we can get all the parts for a good deal.. will just have to help him do it over a long weekend..

probs an old single point system on the rangey.. the sequential plug and drive systems are very good now.. they have their own ecu to control the injectors and can be tuned.. the main cost behind lpg conversion is labour rate.. so if one of my mates can help me we can wipe out alot of the cost.. its not that its just i dont know whether or not i want to move my car that far away from standard.. im just weighing it up in my head at the moment..

at the moment i do soo little milage i might not even bother do to cost and hassel!

[Shoppinit]

I think given the cost of the system, and the diminishing price difference in relative MPG (cost adjusted) it needs to be thought long and hard about.

I would be worried about the piggy back ECU and detonation issues, but maybe that's because I don't know enough about how the ECUs work together.

[Gravitypilot]

the systems are pretty good.. i had experience with the brc for a few years and then they have moved onto a plug and drive system where the lpg ecu should follow the fueling of the petrol ecu to the best of its abliltiy..

many bentlies were converted on the system and 550+ cars.. i think 500-550 is tops for 8 injectors... but if you know what you are doing you can double up the injectors and run 16 for huge potential.. the burn is cleaner it should in theory prolong the engine life...

if im only doing 2000 miles or less in the rs every year, i dont think i can justify it... and it means me having to get rid of the tool kit in the spare well and relocate that heffing battery which will take up boot space even if i make a nice carpeted box

but petrol is getting crazy now motorway service stations make me sick!