1 or 2 step colder plugs?

JC671 · 05-21-2011, 11:40 PM

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

wstar · 05-22-2011, 07:02 AM

Our stock plugs are Denso FXE24HR11, and they're already pretty cold. Check out this other thread too: Stock Spark Plugs - heat range?

RCZ · 05-22-2011, 12:15 PM

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

G37sHKS · 05-22-2011, 12:52 PM

^ be safe better than sorry I guess.

JC671 · 05-22-2011, 04:39 PM

Quote:

Originally Posted by RCZ

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..

modme · 05-22-2011, 04:54 PM

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

been running these since day 1 with twin turbos.

wstar · 05-22-2011, 05:58 PM

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.

Dembflyr · 05-22-2011, 06:29 PM

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

JC671 · 05-23-2011, 12:35 AM

Quote:

Originally Posted by modme

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

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

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

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.

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

Dembflyr · 05-23-2011, 06:06 AM

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

wstar · 05-23-2011, 07:38 AM

Quote:

Originally Posted by Messiah_671

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).

V8Killer · 04-06-2012, 09:58 AM

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.

BAHUMAT2JZ · 04-06-2012, 10:14 AM

Quote:

Originally Posted by V8Killer

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

V8Killer · 04-06-2012, 10:33 AM

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

GrooveStyle · 08-14-2013, 10:06 PM

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?

05-21-2011, 11:40 PM	#1 (permalink)
JC671 Enthusiast Member Join Date: Feb 2011 Location: Guam Posts: 451 Drives: Toretto around Rep Power: 14	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 __________________ A special "Thank You" to the Fast Intentions Crew! "Fueled By Passion"

05-22-2011, 07:02 AM	#2 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Our stock plugs are Denso FXE24HR11, and they're already pretty cold. Check out this other thread too: Stock Spark Plugs - heat range? __________________ 7AT Track Car! Journal thread / Car setup details

05-22-2011, 04:54 PM	#6 (permalink)
modme Enthusiast Member Join Date: Mar 2009 Location: NY Posts: 345 Drives: G37 Rep Power: 16	Here you go: HKS USA M-Series Super Fire Racing Spark Plugs been running these since day 1 with twin turbos. __________________ GTM Twin Turbo Stage 2\|GTR Turbo/Engine Gauges\|KW V3 Coilovers\|HKS Exhaust\|Oil Cooler\| Vossen CV1

05-22-2011, 05:58 PM	#7 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	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. dAvenue likes this. __________________ 7AT Track Car! Journal thread / Car setup details

05-22-2011, 06:29 PM	#8 (permalink)
Dembflyr Track Member Join Date: Feb 2010 Location: Indiana Posts: 886 Drives: G37S Sedan Rep Power: 16	Got mine from GTM. I'll have to check the part number when I get home later in the week. __________________ 2012 G37S Sedan 6MT - Project Practicality 2009-6MT-Sport/Touring-Dembflyr's Journal-TT Build Thread-CAR IS SOLD

05-22-2011, 12:15 PM	#3 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	IS there any advantage on going 1 step colder then if our SP's are already good?

05-22-2011, 12:52 PM	#4 (permalink)
G37sHKS A True Z Fanatic Join Date: Feb 2010 Location: Dubai Posts: 1,183 Drives: 09 G37S Coupe 7AT Rep Power: 20	^ be safe better than sorry I guess.

05-23-2011, 06:06 AM	#10 (permalink)
Dembflyr Track Member Join Date: Feb 2010 Location: Indiana Posts: 886 Drives: G37S Sedan Rep Power: 16	I just realized that I have the invoice in my email. The part number of the plugs that I have is: 50003-M40HL __________________ 2012 G37S Sedan 6MT - Project Practicality 2009-6MT-Sport/Touring-Dembflyr's Journal-TT Build Thread-CAR IS SOLD

04-06-2012, 09:58 AM	#12 (permalink)
V8Killer A True Z Fanatic Join Date: Feb 2011 Location: Newport, NC Posts: 1,127 Drives: It Hard Till It Pops Rep Power: 16	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. __________________ "Punch" Too much to list and a baby shot of nitrous....

04-06-2012, 10:33 AM	#14 (permalink)
V8Killer A True Z Fanatic Join Date: Feb 2011 Location: Newport, NC Posts: 1,127 Drives: It Hard Till It Pops Rep Power: 16	How big of a shot are you using? Any issues? How long have you been running your kit? __________________ "Punch" Too much to list and a baby shot of nitrous....

08-14-2013, 10:06 PM	#15 (permalink)
GrooveStyle Base Member Join Date: Sep 2011 Location: Waterloo, Iowa Posts: 230 Drives: '12 370z GM 6MT Rep Power: 13	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?

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