Those who run LPG converted 2.2's

[hunker7]

Don't think it is.

[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]

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

[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.

[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]

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.

[hunker7]

It seems it's running rich on petrol too, goes to about 10.5 AFR and it shouldn't be less than 12. Have last exam tomorrow, so will get log for lpg and petrol in 3rd form 2000-7000 rpm

[hunker7]

The very lean points could be when you change gear or are on the overrun?

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those very very lean are when I change gear yeah. But on WOT it sometimes runs at 15-18 AFR, and in second at around 5k it starts juddering and looking at the data it goes to 11.5AFR.

I am going back to London next Sunday, and dad will be with me, so I want to get it calibrated on the way as I will have 200 miles of M1

[diesel des]

The very lean points could be when you change gear or are on the overrun?

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[hunker7]

Is this on petrol or Lpg. Get a graph of both on a third gear pull from 2 k rpm to 7 k and overlay them.

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that's a quick run on LPG on 2nd and 3rd. I'll try and do that as soon as I can. I can feel car not running properly at higher speeds.

[diesel des]

Is this on petrol or Lpg. Get a graph of both on a third gear pull from 2 k rpm to 7 k and overlay them.

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[hunker7]

This is AFR and it is running super rich at points and too lean at others. Before I try and get it right, At any gear at WOT I shouldn't be seeing more than 12.5 to 13.2 AFR?

[hunker7]

Is there a way to log AFR against RPM? Currently can only do against time which isn't great.

[FreitasS6]

Hunker7, i totally get you man. I seldom let anybody tinker with my cars. but there are somethings that are best left for the guys that know how to do it. i think that you just need to find the right guys, the ones you did are clearly not the ones for the job!

But dont let that speak for every guy in the business, there should be one that can help you!

If not, and you prefer to do it by yourself ( which i applaud ) maybe you could get some info from the source ( the guys that have built the kit ).

Hope you sort your Avant, let us know how it goes!

best of luck to you!

[hunker7]

I think you need some schooling on the first law of thermodynamics.
None of your yadda is going to change a thing about it.

It makes no difference if it is liquid or gas at the areas where efficiency is concerned.
It makes a lot of difference on WOT, but that's about it.

Nothing of what you say is true. Your claims are either made up or your engine is detuned on gasoline (4.0 cherokee has **** mapping from factory).

It will always be 20-25% worse on fuel given proper mapping on both fuels, end of.
Why? Because you can not get out more than you put in. And in case of LPG you put in 30% less per liter. You can gain some back running it lean burn, but that is below 5%.

What do you mean by "running lean burn"?