Plug grade for stage one mods on GTR - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

NikWilson · 2nd May 2005, 09:10 PM

Anyone know what grade of Iridium plug should be used on a GTR with stage one mods.

Induction kit
downpipes
sports cat
cat back exhaust
Boost controller

I think I will need to change my NGK's for a colder grade. But to what?

Cheers

Nik

Jay-Kay · 2nd May 2005, 09:12 PM

I use HKS Iridium , heat grade 8.

NikWilson · 2nd May 2005, 09:26 PM

Thanks for that, I thought it may well be an 8, but just needed some confirmation.

HKS are Denso's? Is a heat grade 8 HKS plug the same as a heat grade NGK plug?

Nik W

NikWilson · 2nd May 2005, 10:39 PM

Just been checking the net, I think NGK iridiums only go to a heat range 7 (the standard is a 6), so if I want an 8 (NGK scale), I guess I have to use denso's. Or am I missing someting here?

I hev been told that as arule of thumb, each incrase of 70-100bhp needs a grade cooler plug, so it may be that a 7 will be Ok?

Nik

Alan · 3rd May 2005, 07:39 AM

HKS 8's for me as well.

No probs over the last 4 years

(same set)

Best regards Alan

Drew UK · 5th May 2005, 07:01 AM

from what i can see on this tech page..
http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm

the standards are listed as bcpr6 plugs, but the BCP = BK. (14mm thread, 16mm hex, 19mm thread reach)

so you could get a BKR8EIX NGK plug in there.

Drew

JAY-R32 · 5th May 2005, 06:47 PM

Quote:

Just been checking the net, I think NGK iridiums only go to a heat range 7 (the standard is a 6), so if I want an 8 (NGK scale), I guess I have to use denso's. Or am I missing someting here?

Yup , NGK BKR8EIX or BKR9EIX

I recently got 6 BKR8EIX's for mine , cost £48 inc vat ( ill get some 9's soon for trackdays & 1/4 etc...)

Thats quite a difference to HKS / Greddy prices

tweenierob · 6th May 2005, 05:32 PM

Where from Jay?

Rob

JAY-R32 · 6th May 2005, 05:56 PM

I got them from my local BENNETTS motor factors, got them to call NGK , and they had them delivered next day.

He did say it was a "price to me" (i go there a lot) but it seems everyone says that nowadays , so dont take much notice of that.

2nd May 2005, 09:10 PM	#1 (permalink)
NikWilson GTR Register Member Join Date: Oct 2002 Location: East Dereham, Norfolk. UK Posts: 933	Plug grade for stage one mods on GTR Anyone know what grade of Iridium plug should be used on a GTR with stage one mods. Induction kit downpipes sports cat cat back exhaust Boost controller I think I will need to change my NGK's for a colder grade. But to what? Cheers Nik

3rd May 2005, 07:39 AM	#5 (permalink)
Alan GTROC Member 018 Join Date: Jul 2001 Location: London & Dubai Posts: 4,630	HKS 8's for me as well. No probs over the last 4 years (same set) Best regards Alan __________________ ----------------------------------------------------------- R33 GTR Standard Clutch Plate For Sale/Offers My bike,s got more BHP than most!!!! Don't make me get the bike out YOU WILL LOSE!!! SKYLINE FAQs Visit Alan,s GT-R Home Page

6th May 2005, 05:32 PM	#8 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,833	Where from Jay? Rob __________________ 599hp R35 Gtr www.trracing.co.uk T62 Going back on for track WTF!! :D Addicted to Snett!! Roll on the 24th of jan £99 rocks!

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2nd May 2005, 09:12 PM	#2 (permalink)
Jay-Kay GTR Register Member Join Date: Nov 2004 Posts: 193	I use HKS Iridium , heat grade 8.

2nd May 2005, 09:26 PM	#3 (permalink)
NikWilson GTR Register Member Join Date: Oct 2002 Location: East Dereham, Norfolk. UK Posts: 933	Thanks for that, I thought it may well be an 8, but just needed some confirmation. HKS are Denso's? Is a heat grade 8 HKS plug the same as a heat grade NGK plug? Nik W

2nd May 2005, 10:39 PM	#4 (permalink)
NikWilson GTR Register Member Join Date: Oct 2002 Location: East Dereham, Norfolk. UK Posts: 933	Just been checking the net, I think NGK iridiums only go to a heat range 7 (the standard is a 6), so if I want an 8 (NGK scale), I guess I have to use denso's. Or am I missing someting here? I hev been told that as arule of thumb, each incrase of 70-100bhp needs a grade cooler plug, so it may be that a 7 will be Ok? Nik

5th May 2005, 07:01 AM	#6 (permalink)
Drew UK GTR Register Member Join Date: Dec 2001 Posts: 88	from what i can see on this tech page.. http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm the standards are listed as bcpr6 plugs, but the BCP = BK. (14mm thread, 16mm hex, 19mm thread reach) so you could get a BKR8EIX NGK plug in there. Drew

6th May 2005, 05:56 PM	#9 (permalink)
JAY-R32 GTR Register Member Join Date: Sep 2003 Location: Herts Posts: 1,217	I got them from my local BENNETTS motor factors, got them to call NGK , and they had them delivered next day. He did say it was a "price to me" (i go there a lot) but it seems everyone says that nowadays , so dont take much notice of that.