I have a 2000 a6 2.7t with apr chip. I was wondering what the best plugs to run with this would be and the proper gap of the plug. I've heard .028 but just wanted to make sure.

 

Get OEM. OEM is multiprong NGK which should be factory gaped.

 

OEM -BOSH HGR6KQC OEPLUG Do not gap. Gap is not adjustable. V6 2.7 APB GAS

Dealers sell NGK only -PFR6Q ?

BTW - what qualifies a spark plug to be the best?

-longevity
-price
-performance
-other

(look in your Bentley manual - the spark plugs chart contains curious data)

 

i could careless about price or longevity. i want whatever runs the best. Ive heard stock gap is .032 but the car runs better when chipped at .028...

 

Here is what I know. (which ain't much)

When running an engine with higher boost (and higher cylinder pressures) it is useful to close the spark plug gap to lessen the resistance between the center electrode and the ground. This need arises from the higher concentration of fuel and air molecules in the combustion chamber. If the concentration is high enough, the spark will not jump the gap properly and a misfire will occur.

Secondly, engines with higher boost levels may benefit from a colder plug. Meaning a heat range colder. This is due to the fact that the air/fuel mixture in the chamber is under more pressure and can ignite due to the heat retained in the spark plug before it is fired. This is pre-ignition. BAD. A spark plug with a colder heat range may be necessary to prevent this in some cases. This will shed heat quicker and make pre-ignition go away. However, too cold and you may foul a plug as it will not be able to keep itself clean particularly if short trips with out full operating temps are frequent.

That being said, call apr and ask them.

I personally would tighten the gap on the stock plug to about .028" and run that. If the knock sensors are having to do work at WOT, then back down a heat range.