Foul smell for 2-3 seconds on first rapid accleration

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Hi All - facing a strange issue and dunno where to check. Need help.

During initial rapid acceleration  from low speed - like joining the expressway there is sweet burnt smell for a few seconds.  Like acceleration from 30kph to 60kph with mild up slope will cause the smell. Then the smell quickly goes off. Can't pin down where the smell comes from.

I have tried fast acceleration from 60kph to 100 kph but got no smell. Otherwise if I drive the whole day during normal driving also got no smell.

Would be grateful for any pointers into the cause.

[Enzoni]

You are new latio owner?

This is a 'unique feature' of latio, maybe because of the overflow of '-ve ION' from the plasmacluster aircon during sudden acceleration?? 

However my 7.5yrs old latio no longer produce this smell... kinda miss it haha