You've got it backwards. Nitrous and boosted cars have much higher cylinder pressures which often "blow out the spark" on plugs. To combat this, you CLOSE the gap, often to around .035"

 

Actually now that you say that...that does sound right. I stand corrected. So why does NGK pre gap a spark plug that is specific to our engine with the wrong gap for different plugs?

 

That spark plug is not specific to the LS1. It is used in other engines. And although the manufacturer may recommend a .060" gap, the LS1 runs better on a smaller gap. It's been proven time and time again.

 

See that's the thing. The factory recommended gap is .060 so the spark plug manufacturers when building a replacement plug spec out a .060 gap.

Many years ago some industrious hotrodders tried NGK copper plugs in their LS1s and found out that they work just a little better than stock for high performance applications. During their research they found that tr55 were the right heat range and depth but with a .050 gap and it worked well so now most that run their cars hard or at the track use the copper plugs and the smaller gap for more consistant spark under extreme conditions. Tr6s are one step colder and many use them for FI and NO2.
For a daily driver that isn't going to get beat on much I'd stick with a quality Platinum or Iridium and tighten the gap to .050-.055. Why put in a copper plug that will need to be changed every 10-30k (depending upon tune and usage) when you can use a plug that will go 50k or more?

 

what is the ect sensor?? will it make a car miss or run rough if it is unplugged or broken?


thanks bobby

 

ect = engine coolant temperature.