I have a V1 setup (stock pulley I believe) and exhaust thats pretty much it performance wise. I want to change my plugs only cause I don't know when the dude before me did it. I am just curious as to how many steps colder I should go.

After reading the stickies I found they recommended NGK coppers gapped between .034" and .038" Any better recommendations?

Thanks!

 

I'm not sure if there is a single correct answer for how much colder to go, but I am running 1 step colder plugs on 9psi, with a gap around .036".

 

You definately don't need 2 step colder, honestly if you are on stock pulley you might be able to get away with 0 steps colder aka stock plugs, but the SC guys will know a bit more about it than me. Also, you want to run the largest gap (up to stock gap of .044") that you can without getting spark blowout. You don't need to run a gap as small as indicated in the stickies. I can run 14psi on 2 step colder plugs with a fast spooling turbo and not get any spark blowout at .032" gap, so .034" or .038" even might be overkill, I bet you can get away with .040", maybe even larger.

 

I've got some brand new Denso Iridiums I'll sell you. Can't remember if they're 1 or 2 steps colder. I wanna say 2 but I'm not certain.

$40/shipped

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I would suggest stock or 1 step colder. Generally reserve 2 step colder for high boost + nitrous.

You can check it by making a good pull and shutting the car off immediately. Pull a plug and check for a noticeable color difference on the strap.
- If it is on the vertical portion down near the threads it is good.
- If it is past the 90 on the horizontal portion you need to go down on the heatrange.
- If the whole thing is discolored you are not getting full burn and need to go up heat range.

My favorite plugs are still the NGK Coppers, but be prepared to change them more frequently. Next up on my list would be NGK Iridiums.

 

I had my stock platinum plugs on for a couple of years on my stock setup with no ill effects whatsoever. I do suggest you should pull the plugs to see the color and condition.