Just one question for now?

[joecar]

Manuel,

I would do this:

tune VE using WB only (i.e. front NBO2's removed);

then install/enable the front NBO2's and see how they read and possibly fine tune VE.

( make sure MAF is disabled, i.e. MAF DTC present during VE tuning )

[Gelf VXR]

Hello everyone.

LS2 engine with E40 pcm in Australian VZ clubsport.

My question is in relation to table B3671. The original tune has 14.7 across the board to reflect the stoichiometric ratio of normal unleaded fuel,
however I am using premium shell unleaded 98 ron which supposedly has a stoichiometric of 14.35. Should this be the value that I populate in that table.

Thanks again .

I found a data sheet for BP ultimate from Australia, it also has stoich AFR 14.4, no ethanol content, during my research I also read Shell 98 had similar stoich AFR but I couldn't find a data sheet.

So you can set the PCM to the correct stoich value, don't forget if your using a wide band to set the stoich AFR to the same value. If you search efi calibrator / Greg banish he will confirm you need to set to for the stoich AFR of the fuel used.

Few fuels from the pump are 14.63 anymore, fuels these days now have at least 5% -10% ethanol lowering the stoich AFR.

The PCM can compensate with the fuel trims, but if your trying to nail down VE and MAF, I'd set the correct stoich AFR for the fuel your using.


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[Manuel]

Thanks gelf, I wonder how widely it is used.

So I am getting the extractors and exhaust fitted on Thursday.

Will the car start and run with the rear O2s not plugged in?

[Gelf VXR]

Yes I think so, but PCM will need to be updated so that the rear o2's are not reported so you don't get a warning light


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[Manuel]

Thanks.