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.

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.

Thanks;)


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

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.

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?

was also looking at NGK-93026

Is this where an exhaust temp gauge comes in handy?

It is a good idea. And I run stock GTR plugs mine. However when I pulled my stock plugs out they were the same part/model # as the GTR plugs I was about to put in...so just check first. Might have no need for them unless you are high mileage.

Whne my turbo kit was installed, the shop recommended and installed stock GTR plugs instead of the HKS plugs. I don't remember the part number offhand, but I'm sure google can find it.

Groove DO NOT gap the HKS spark plugs if you purchase them; they come out of the box pre-gapped at .030 (I believe mine were) but on the side of the box it tells you not to change the gap thickness because they have some special dual tip

GT-R GTR R35 GENUINE NISSAN NGK 22401-JF01D SPARK PLUG on eBay!

Sold by Fontana Nissan...and $8 less per plug then I payed locally.

Awesome. Thanks a bunch guys! Best forum ever....

yeah, the risk of fouling increases

I run these on my gtm Stage II TT set up (HKS 50003-M40HL)... Great Plugs and their not cheap. If your not FI just stick with the stock plugs...

Had good luck N/A with OEM GTR plugs.

Got them gratis from NISMO NA but I definitely recommend them as a cheaper alternative to the HKS units.

Also..

LOL

That's why the GTR plugs were installed in mine. HKS plugs are expensive.

DILAKAR8A8 is the plug to run on your boosted Z in my opinion! Hasn't let us down yet!

Thanks,
Alex Goodwin
AlexG@motionlabtuning.com

HKS plugs here. recommended by local tuner and i couldnt be happier.

Same here. HKS.

Just wondering if anyone has used the ngk 1 step colder plugs for their boosted ride yet? Don't think I saw this option before.

Most of us are running the stock GTR plugs.

I thought the majority were using HKS plugs. I'm most likely going to get HKS plugs again just wondering if anyone used the NGK plugs.

After my re-tune last weekend, I am having to pick up new plugs, we think one is not 100% anymore. I was told the NGK would be great and they have been using them in 350z & 370z for years with no problems. And between spending $18 per plug or $25-30 per plug and the NGK are highly rated also I will try the NGK.

My exact thoughts! Ngk is good but I never used them for VQ motors. Lemme know how it works for you.