Im wondering what the gap is supposed to be on NGK plugs used with an ECU upgrade. i understand they are supposed to be gaped a little different when you run a chip.


Who has the answers?

 

.028-.030" for copper plugs with a chip.

 

why is there a range? shouldnt they all be the same or is that just a range for slight variations in gaping

 

two thousandths of an inch is not a big 'range'. anywhere in there will work. if you are running very high boost a few thousandths smaller will prevent the spark from being blown out. if your car is stock even .032" is fine. chances are your plugs will vary .001" anyway when you are hand gapping them without a feeler gauge.