Gap has a lot to do with igniteability. The bigger the gap, the better combustion. HOWEVER, this comes at a cost. The bigger gap requires MORE voltage to spark, putting a much higher strain on your ignition system. With a turbo charged motor, the gap is usually smaller. This is due to the fact that higher cylinder pressures make it harder for the plug to fire, therefore increasing voltage requirements (this is why 2.5L NA is 0.044" gap and the 2.0L and the 2.5L turbo is 0.028 to 0.031" gap).

 

Gap has a lot to do with igniteability. The bigger the gap, the better combustion. HOWEVER, this comes at a cost. The bigger gap requires MORE voltage to spark, putting a much higher strain on your ignition system. With a turbo charged motor, the gap is usually smaller. This is due to the fact that higher cylinder pressures make it harder for the plug to fire, therefore increasing voltage requirements

That is why the WRX has coil-on-plug ignition !Thumbs Up

 

Thank you! I'm gapping .030 and installing now.

 

Good luck man, don't forget some anit-seize!!

 

True its alot better than what the GC8's had lol

 

I gapped my Pulstar plugs to 0.030, applied some anti-sieze to the threads, and a smeared a small glob of dielectric grease on the ends to ensure a good electrical connection. Good to go for another 30,000 miles hopefully. Also, don't torque them down too tight - just snug em gently.

 

Dielectric grease does not conduct electricity. It is used to insulate and seal out moisture. Still good to use. But it doesn't directly create a better circuit.

Jeff

 

Holy crap my old ones were fouled! Reddish orange high heat glazed. It probably happened when I tried a chepo CAI in it.

 

BTW, does anybody have any dyno proof that Pulstar plugs have any gain on HP???

 

Does anybody know the spark plug gap on a 05 EJ20 WRX? I cannot find that info anywhere on a sun afternoon. Just bought some NGK Iridium IX plugs and the auto parts store people said they were pre=gapped....wrong. 2 were .030 and 2 were .040. same part no

Bro literally same shiit my car started missfiring and then I gapped all of them at 28 but I am getting missfires in cylinder 1,2,3