kryptonite8789

I am about to get my X tuned and she should be putting down a little over 500 horsepower. My question is...what spark plugs should I put in. I've been hearing that the NGK Iridium +1 Colder ones work great. If so, what gap should I get them in? I am reading DSPORT right now and it is saying .032. Thanks for the help.

Hiboost

iTrader: (9)

One step colder plugs can help control knock a bit when pushing the edge, but they could worsen MPG when your engine is cold although I never noticed anything. Using a .032" is far too wide of a gap, typically for a car around stock horsepower levels the .026-.028" may work ok, but when you start to flow more air past them I found that even that was too wide.

Right now at .022" I can run just about any boost and airflow levels through my engine that I can throw at it. When I was in the .028" range after switching to the GT30 turbo, I could barely run over 22 psi before encountering spark blow out.

kryptonite8789

Ok, so you are running .022...sounds good. How much power are you pushing? Odd how DSPORT listed .032 then...

murlo26

iTrader: (9)

I am running stock plugs at 570whp...they work perfect, I think mine are also gapped around .022".

I've seen way way more problems from people using other plugs that aren't stock then when people stay with stock plugs.

Honestly, i wouldn't stray from stock.

I believe there have been people up over 700whp on stock plugs and they work fine.

Gump

^ i'm with murlo....stick with the stock plugs...if yours are fowled head over to the stealership and grab a new set.