spark plugs

[boostntomuch]

i tried to search but couldn't get a clear answer. i have a 07 ms6 with intake and BOV and motor mounts. i want to change my spark plugs but i don't know what kind will be the best choice and what should the gap be set at? help a newbie out. part numbers will help. corksport downpipe is on order too.

[phillyb]

this thread should help you a ton - http://www.mazdaspeedforum.org/forum/foru...ge-1-2-a-5692/

[Spoolme]

looks like Philly has taken care of you. Stick with the stock and remember to check the gap before installing.

[dagrimey1]

NGK Laser Iridium Spark Plugs
Applications: MAZDASPEED 6, MAZDASPEED 3 (OE Replacement)
Part Number: 3787, ILTR6A-8G
Gap: .032" gap
Thread Size: 14mm
Reach: 26.5mm
Heat Range: 5

[nosaccordh22]

agreed, no reason to go with a different temp plug OEM will work

[amoosenamedhank]

I guess what I'm also wondering is what what point people are noticing the plugs are running too hot? In that linked thread a bunch of people ask the question but no one seems to answer it. There is obviously a certain point where the colder plugs are necessary.. so what is that point?

[Sacrilicious]

1 step colder plugs are needed if you run higher boost than the stock 15.6psi. if you're running stock boost levels, don't bother getting colder plugs, because all it's going to do is foul faster. i would recommend just getting another set of the stockers...they work just fine.

btw...is there a particular reason you want to change the plugs? have you checked them out to see if they actually need changing? how many miles do you have on your car?

[amoosenamedhank]

Originally Posted by Sacrilicious 1 step colder plugs are needed if you run higher boost than the stock 15.6psi. if you're running stock boost levels, don't bother getting colder plugs, because all it's going to do is foul faster. i would recommend just getting another set of the stockers...they work just fine. btw...is there a particular reason you want to change the plugs? have you checked them out to see if they actually need changing? how many miles do you have on your car?

No No I get all of that.. I'm wondering, roughly, at what point are people see the stock temp range plugs running hot. Obviously the stock plugs temp plugs work fine for a stock car... but at what point are those plugs looking too warm?

[Sacrilicious]

well, since people have trouble running cobb stage 1 OTS maps without colder plugs, then it looks like 17-18 psi is already too high. so from the looks of it, just 2-3 psi is enough to require colder plugs, so unless you run a very conservatively retuned cobb map or SB tune, you're going to need an upgrade.