QUOTE(mxsteven @ Aug 23 2013, 11:31 AM)
NGV always like that because your ignition is not advance enough.... and the mixture is not correct.
The last time i setup for my friend using a standalone ECU dual mapping, the tuning was quite great....
NGV ignition on idle was like 24deg and petrol is 13deg.... thats the different.... Retard tioming on NGV could result burnt valves
Boss Steven, thanks for your in-put. However I can't transfer your in-depth experience into my skull directly, could you please clarify what of your mean by ignition is not advanve enough and misture is not correct?
I had not facing such problem (just the car is always under- powered) before my last changes of plug.
Now my car acts perfectly in gas mode, still observing the petrol mode (as I clocked most of my road time in gas mode, petrol is only used to start the car and before I switch off engine).
So are you indicating that the mechanic by restricting the air flow, he is effectively retarding the timing on my car? which is going to cause
valves burn in later stage?
BTW how much is your friend's standalone ECU? VDO wira NGV as well?
I guess it's a compromising method by restricting air flow and dual mapping on ECU would be the best solution

, but stand alone for VDO wira

let alone sifu/ master like you to set the thing up ...