10-04-2018, 08:51 AM
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#4 (permalink)
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A True Z Fanatic
Join Date: Jan 2016
Location: Atlantic SE
Posts: 1,361
Drives: '10 K23 ST 7AT
Rep Power: 30527
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Quote:
Originally Posted by lj909
From what I've read. The higher the pressure, the smaller the gap. If your N/A open them up to get the biggest spark. If your boosted or running some sort of high comp engine or nitrous you need a smaller gap so the spark can make it across.
I personally opened all mine up (can't remember the exact #) made sure they were all the same. And I also got a index washer kit so that they were all pointing towards the intake side.
I can't really say there's more power but the engine sounds smoother to me.
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I found the existing OE Plugs to be at a smaller gap than the manual recommends 0.038". I opened the new units to 0.041", the lowest of the scale the manual recommends.
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