LPG Conversion for 7A Coupe 20V Quattro?

[pnanassy]

its stock (not sure if its a MC 1 (7,8) or 2 (8,6??) )

it will get a complete NG/NF 10:1 CR engine.im sure it will handle easily 1 bar of boost without any problems.K24.

Currently it runs 1.5bars,it might need some more tweaking,or even some internal cooling especially on long runs,but that will need testing.

[pnanassy]

i made a small vid of a "coldstart"

http://www.youtube.com/watch?v=aMrvopE-JbY

[Jonnybravo]

There is simply no need for the fuel injection system to run the engine on LPG (IF the system is built this in mind!).Even in the coldest -15C the engine started immediately,and altough it runs a bit rough in the first minutes,most can live with it.

It was only done as a research and i wanted to show that there is a simple and effective way to upgrade the problematic Kjet system.

Motec costs a lot thats for sure,but VEMS can be VERY cost effecticve,and with the unlimited tuning potential,each and every application can be finetuned to great extent.
Calculating that you will not need the LPG ECU for about 180-200GBP,it can be pretty reasonable.

Im not sure about the LPG car regulations in the UK,that can be the tricky part.

Peter

My own car was LPG only and no issues with MOT's etc..

As you say ran mildly rough on startup but that was it

[knobstar]

There's a hardly any difference between that and a kE-jetronic car - very interesting, Peter. There is so much misinformation out there regarding LPG cars and the need for petrol for cold starts; at least it's clear in my head now

[pnanassy]

My 10V with seq. LPG.

[sam80quattro]

thats a nice setup indeed, again i had no problems running my 90q purely on lpg and that was single point setup. didnt even have a petrol tank in as thats were i put the lpg cylinder lol

[pnanassy]

So what do you think,should i go 2.5 stroker with my new 20vt_lpg engine with some more expense ,or just a regular 2.3 20vt_lpg.Turbo will be a K26 (56mm turbine exducer),with tubular ex.manifold.Not loking for max power,its a fwd typ 85.
I plan to use it 50%city (traffic jams all the way and 50-70kmh max) and 50%road (100-120max,lot of overtaking crazy drivers),not much highway in my way.

Will the added torque help to lower consumption when driven carefully?Can i idle it at a lower rpm compared to the 750rpm of the 2.2?

Any ideas welcome.

Peter

[knobstar]

I should start a new topic peter.....there could be a lot of opinions on this one
Also, I'm not sure people would expect to find this sort of a question on page 2 after reading the first post...

My opinion: do it to a 2.3 as then more people will be able to see the benefits of running on lpg when compared to their car

[pnanassy]

The stroker idea was skipped,my current engine started to lose compression (which i compensated with individual cylinder ignition and fuel trims thaks to MoTeC),so i had to act quickly.
Got the parts back from machine shop (MC block,7A internals,7A head modded to AAN spec,chineese EM,AAN IM).Just have to finish the current projects,and i will put the turbo7A_LPG into my FWD DD.

[pnanassy]

Engine is near complete,just need a few bits.

[kotnelson]

I run dual fuel on my S6C4, petrol and LPG.

Fuel consumption is about same as petrol.
High way I can get approx 17 ltr/100 KM at speed between of 120-160 Km/Hrs
City driving is very bad, as bad as 30 ltr/100 km

Here some pic




This pic, LPG injector on top of IM.

[pnanassy]

Must be the tune.

I belive that mine will never exceed 20 liter/100km.
The current one needs 11-14L,but that only NA.

[kotnelson]

Must be the tune.

I belive that mine will never exceed 20 liter/100km.
The current one needs 11-14L,but that only NA.

Thing different
- Outside ambient 30-36 C. In the city at heavy traffic during the day dash board
show up to 40 - 45 C (road surface will get hotter).
- Turn on AC
- High speed driving
- S6 weight >1800 KG with GAS tank (last weight when did inspection was 1825 KG)

I could have 11-12 ltr/100 km when travelling at steady speed of <90 Km/Hrs
on high way with light throttle. Allow boost guage not to exceed 0.8 - 0.9 Bars
That is too boring to drive.

City driving is bad as 2 KM may take me more than 1 hour.

I tuned GAS's ECU as close as the petrol ECU. GAS will consump approx 5% higher.
I avoid long run @high speed with GAS. Normally I run above 200 km/hr in short period.
As I don't want to damage the engine. If I want a long run with high speed I switch to
petrol this will save me in repair and maintenance the engine. At full power with GAS
the EGT will raise above petrol up to 50 degree C.

[pnanassy]

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

Here LPG costs 168-190HUF
95 octane 335-360HUF

Peter

[monkey]

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