Is our cars come "rich" from the factory.?
 

Hi Friends,i did a "Uprev" reflashed yesterday,the tuner told me,the car is running very rich[10.5:1] in running from factory,any reasons behind this.?My tuner has bring it down to 12.5:1,any harm to the engine,esp in warm weather in S'pore.?Thanks.

I have adjusted the A/F ratio back to about 11:1,12.5:1 is too lean for our weather,engine runs rough & noisy,when going long distance[about 3o kms] engine felt less power.