Those who run LPG converted 2.2's

[hunker7]

Here is lpg vs petrol 2000-6000rpm in 3rd and lpg map as it is now. On lpg car starts to shake at 5500 rpm. I think lpg is too lean and petrol too rich.

[diesel des]

The Lpg at full load might be slightly lean. Increase the last to points slightly. E.g. 13.7 up to 14.5 and 16.3 to 17.

The Lpg shows a missfire so as the oxygen isn't used in burning it shows up as very lean. Most likely a spark issue. Lpg needs a good spark. I have no problems in Lpg at over 2 bar boost on tfsi coils and ngk irridium plugs.

Yes you also look a little rich on petrol. What map are you running.

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[hunker7]

The Lpg at full load might be slightly lean. Increase the last to points slightly. E.g. 13.7 up to 14.5 and 16.3 to 17.

The Lpg shows a missfire so as the oxygen isn't used in burning it shows up as very lean. Most likely a spark issue. Lpg needs a good spark. I have no problems in Lpg at over 2 bar boost on tfsi coils and ngk irridium plugs.

Yes you also look a little rich on petrol. What map are you running.

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Thanks, I'll do that and report back tomorrow. Have some motorway driving so I'll take laptop with me

I run TFSI coils (year old) and NGK plugs (couple of month old). Mine is stage 1 mapped, not sure what map it is though. Need to ask John.

[hunker7]

Made the changes and now it's starting to shake even earlier. Maybe it is a spark, buy plugs are new.

[diesel des]

Is your map adjusted for the correct dwell time for tfsi coils? They burn out with stock dwell time but get weak before they die. I had this in till I adjusted dwell in vems.

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[hunker7]

Don't think it is.

[prj]

LPG is too rich on top, do not go past 13.3 on LPG.
13.5 is just fine. 12 will melt ****.

Petrol is OK, a bit on the rich side, but won't hurt power a lot.

[hunker7]

Thanks, I will get it logged again in 3rd and see what she runs. Do you think shaking can be down to ignition system?

What could cause richer running?

[hunker7]

200 mile trip averaging 20mpg when driving and engine light comes on, should I move it up or down, or it depends?

[hunker7]

By the looks of it spark plugs is the problem, as I got a misfire at around 4500rpm and fine after that, second time round 4500rpm and it misfires massively. Which plugs you run Des, is it NGK LPG Iridium?

Also, is there any point trying and reduce gas temperature? Would there be any benifits?

Figured out why petrol is running rich too, shows that voltage is too low, so I guess as PRJ said, motronic doesn't like the output from wideband, if I can't fix it OEM will be going back in.

[diesel des]

I use the ngk direct replacement plugs. I could find the part number of needed.

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[hunker7]

I have these, bought at the end of Jan.

http://www.eurocarparts.com/search/408991930

[hunker7]

Have you got a PN for those iridium plugs? NGK only shows stock and lpg plugs. (EDIT: http://www.ebay.co.uk/itm/5x-NGK-BKR...wAAOSwQjNW8pnn (???))

On petrol "voltage too low on lambda" error is popping up, any way I can adjust it through wideband, or I'm better off installing narrow back?

[hunker7]

I get a pretty loud bang in the exhaust when shaking happens

[hunker7]

Fixed one problem and next one appeared. Have changed plugs to Iridium and it doesn't seem to misfire anymore, but now she runs very lean in WOT on bot fuels. Go WOT it sits at lambda 1, then either it works and goes rich (0.8) or lean (1.3/1.4). MAF is new bosch reconditions unit about a year ago. When boosts it boosts properly.