Zac88 Posted April 23, 2013 Share Posted April 23, 2013 Ive been cobb stage 1 for a few months now and also time for me to change so spark plugs. Iirc the stock gap is .030 Should I run a tighter gap with the tune? Link to comment Share on other sites More sharing options...
Max Capacity Posted April 23, 2013 Share Posted April 23, 2013 .028 will be fine. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Zac88 Posted April 23, 2013 Author Share Posted April 23, 2013 Is that in inches or mm? Link to comment Share on other sites More sharing options...
Max Capacity Posted April 23, 2013 Share Posted April 23, 2013 Inches .028" is equal to .7112mm Most Americans talk inches when we speak of plug gap. If your running higher boost you'll tighten the gap a bit. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Zac88 Posted April 23, 2013 Author Share Posted April 23, 2013 Thank you. Link to comment Share on other sites More sharing options...
iNVAR Posted April 23, 2013 Share Posted April 23, 2013 *shrug* Go with the stock gap. The NGK Iridiums are supposed to come pregapped already anyway. There's been mention that people have measured the gap out of the box before and it wasn't the specified gap, but I've never adjusted the gap before and haven't had a problem. Changed the plugs once without checking the gap when I bought the car with 37K miles on it. Was stage 0, stage 1, and stage 2. Then swapped the plugs around..... 70K miles. Didn't bother checking again. Car still runs great. If you choose to check and adjust the gap, do it carefully. The electrode on iridium plugs is thin. You need a good gapping tool. You can't just pry on it. Link to comment Share on other sites More sharing options...
FJuan Posted April 23, 2013 Share Posted April 23, 2013 I've measure the gaps out of the box everytime, just to be 100% sure non are outta range. There has been a few times when gaps were below the .030. Auto parts stores carries the adjustment tool for a few dollars, that will bend the arm without touching the tip. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
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