LPG Conversion for 7A Coupe 20V Quattro?

[kotnelson]

And whats the relation between the fuel prices where you live?

Here LPG costs 168-190HUF
95 octane 33-360HUF

Peter

__________________THB____USD
CNG (NGV)_________8.5____0.264
LPG______________11.4____0.354
Diesel B5_________27.99____0.868
Diesel____________28.89____0.896

Gasohol E20______30.14____0.935
Gasohol E10 - 91__30.94____0.960
Gasohol E10 - 95__32.44____1.007
Gasoline 91_______36.24____1.124
Gasoline 95_______35.34____1.096

Remark : Exchange Currency 1 USD = 32.23 THB

While you pay for LPG between USD 0.719 - 0.814
And for 95 between USD 1.413 - 1.541

[kotnelson]

Hi quite new to this forum thing but very interested in this thread as im currently in the process of collecting parts for an b4 80 quattro project that i plan on running on lpg, so far i have a 3ltr v6 and running gear out of a a4 cab and an m90 supercharger to mount on it am looking at a 2nd hand prins vsi system off a 3ltr v6 a4 and would appreciate any and all constructive input or information

Just my though...

1/ Supercharge on stock NA engine will not give you much power and kill engine life.
2/ Decide on which system to use LPG as below chart
3/ Alternative way to "increase power". In your area you can find 1.8T engine or2.7T bi-turbo which can fit into B4 and gain big power. 1.8T you can mod software upto 195 HP that cost equal to just a supercharge without software. Or with 3B/ABY engine?
4/ Hope you can bolt engine from B5 into B4 without big fabricate of engine bay. Good to run with VSI to get less problem with stock ECM on immo, in my area they run with F-Con VPro.

[pnanassy]

Thanks for the detailed infos!

What lambda dou you have at cruise and at full throttle?

Do you experience power loss when running on LPG?

Peter

[kotnelson]

Thanks for the detailed infos!

What lambda dou you have at cruise and at full throttle?

Do you experience power loss when running on LPG?

Peter

You're welcome. I tunned LPG 3 year ago when I have stock chip of 230 HP.
Tunned as close as petrol. Power loss approx 5% except tunned rich at >5000 rpm
This is to save the engine (I can hit at appro 210 KM/HR).

Last year I put new chip of 264 HP and work fine with petrol and LPG so
did not care to re-tune. I plan to service LPG system by cleaning injector, change
filter, new flex rubber hose, on/off solinoid valve at Tank and reducer. This time will re-tune LPG and good Preventive M. (With this chip I can hit >220 KM/HR without tune)
(will update after tune)

TIP :
-Best to change all fuel hose that can handle E10/E20/E85 start from fuel tank
all the way to rail and return line.
-Don't leave E10/E20 in the tank, better to use 2 tank per month.
-I decide to top up 1/2 tank all time with Gasoline 91 to prevent rust in the metal tank

[pnanassy]

Here is my 20VT LPG engine installed.

[b3robo]

I've done a bit of reading about LPG, I read somewhere there is extra wear on the valves as there is no lead additive in LPG? can anyone confirm this? is reduced engine life a concern using LPG on older 5 cylinder Audi engines?

[kotnelson]

I've done a bit of reading about LPG, I read somewhere there is extra wear on the valves as there is no lead additive in LPG? can anyone confirm this? is reduced engine life a concern using LPG on older 5 cylinder Audi engines?

As far as my knowledge, those engine with leaded fuel in late 70'
I think B3-B4-B5 body, engine using those day should have improved the head.
So there is no worry on this issue.

In my area we run LPG on the 60'-70' Japanese engine and it went far as
500,000 km. w/o problem

LPG will give cleaner combrushion chamber, but a bit higher temp.
Older engine you can advance ignition timing by a few degrees would work better.