Nissan 370Z Forum - 1 or 2 step colder plugs?

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1 or 2 step colder plugs?

Anybody know where I can purchase 1 or two step colder plugs online for a '10 370z?

I've searched around and have had a hard time. Can someone please post a part number and what brand exactly their using.

Thanks in advance:tup:

Our stock plugs are Denso FXE24HR11, and they're already pretty cold. Check out this other thread too: http://www.the370z.com/engine-drivet...eat-range.html

IS there any advantage on going 1 step colder then if our SP's are already good?

^ be safe better than sorry I guess.

Quote:

Originally Posted by RCZ (Post 1126413)

IS there any advantage on going 1 step colder then if our SP's are already good?

Most F/I setup's need it ...Every time I went F/I i did it and its just safer.. I need it cause I'm using nitrous..

Here you go: HKS USA M-Series Super Fire Racing Spark Plugs

been running these since day 1 with twin turbos.

The ideal you're shooting for is "just cold enough to not cause any dangerous knocking" + "hot enough to keep itself clean so it doesn't foul quickly and misfire". It's a delicate balance, and going colder when you don't need to can be detrimental in the long run if those colder plugs build up carbon fouling.

Got mine from GTM. I'll have to check the part number when I get home later in the week.

Quote:

Originally Posted by modme (Post 1126676)

Here you go: HKS USA M-Series Super Fire Racing Spark Plugs

:tup:Thanks, I appreciate it.. What heat range did you go with? Is 8 one step colder from stock or its the stock range? Is 9 two steps colder from stock?

been running these since day 1 with twin turbos.

Quote:

Originally Posted by Dembflyr (Post 1126803)

Got mine from GTM. I'll have to check the part number when I get home later in the week.

Thanks;)

Quote:

Originally Posted by wstar (Post 1126756)

Understood.. With any F/I setup though, I don't think the stock plugs were rated to handle the increased temps though.. I'd rather be safe than sorry plus zex recommends it :)

I just realized that I have the invoice in my email. The part number of the plugs that I have is: 50003-M40HL

Quote:

Originally Posted by Messiah_671 (Post 1127141)

Understood.. With any F/I setup though, I don't think the stock plugs were rated to handle the increased temps though.. I'd rather be safe than sorry plus zex recommends it :)

I understand the FI thing. Just on a lot of other forums/cars, people have jumped on the "1 step colder" bandwagon on lightly-bolted-on cars. Given that our plugs are already quite cold, I want people to be aware it's probably a patently bad idea unless your setup really warrants it (e.g. FI).

OP what sparks plugs did you end up going with? I am currently installing a zex kit myself and I am exploring my options for spark plugs.

Quote:

Originally Posted by V8Killer (Post 1643713)

OP what sparks plugs did you end up going with? I am currently installing a zex kit myself and I am exploring my options for spark plugs.

These are the one i us with my zex kit. They came gapped at .032
Sparkplugs.com - Application Search Results

How big of a shot are you using? Any issues? How long have you been running your kit?

Thinking about pulling the trigger on the plugs Dembflyr mentioned for the MHI TT kit I have on order (50003-M40HL). Still a good idea? Any special Gapping specs?