i just bought some new spark plugs for my 2003 evo but i dont know how much i need to gap them. does anybody know?

 

I like .026 to .024 on the copper plugs

 

i gap mine at .25 and i havent had an issue blowing out the spark at 35psi..

 

.024

 

On my irridium plugs, I go .26

I had .4 on the plugs that came on the car O_o

 

.026 became a problem when I installed the evogreen and pushed the boost to 27psi @ 11.5:1

it's .022 now and silky smooth, no more sputtering

 

Depends on which you bought. The 7 Series plugs can be gapped as much as .029 and the 8 series as much as .024

 

Copper .022 worked like a charm for me with minimal mods

 

Is this the same for the IX? I know the stock gap is .044

 

For the Evo IX the stock gap is 0.021

within 9500 miles i have changed my plugs 3 times. On consumables like plugs, oil, lubes etc etc i dont care about the cost. all these are small things but very vital for the well being of the engine/car

recently i changed my plugs with the 1-step colder NGK Racing Series plugs and they are gapped at 0.024 which is the upper limit of the factory specifications...

 

Oh i looked it up on sparkplugs.com and it said .044. I was looking to get copper but i read previously there wasn't anything available. Where do you get NGK racing series?

 

www.sparkplugs.com

R7437-8 the code

expensive as hell but they are needed if you have plenty of mods and you run high boost...

 

Wow those are expensive. Thanks for the info. I need to research some coppers a little better.

 

mate if you have a IX either pay the big bucks if you need colder plugs or stickj with the OEM ones... if you search in this forum you will see that for the IX there are very few options...

 

Yeah that is what i read, almost no options on plugs. Whats the life span on the racing plugs?