Your thoughts on NGK BKR5EIX-11 - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

ER34GTT · 4th August 2005, 04:05 PM

Hi!

Following a discussion on iridium spark plugs... I just wanted to know if any of you have any thoughts on NGK BKR5EIX-11 plugs for a R34 GTT Skyline, only mod is a Apexi intake.
To Hot or to Cold?
If so, any recommendations?

Thanks for that!
Tomas

ATCO · 4th August 2005, 04:15 PM

I know its a GT-T, but a 5?

I thought 6 was seriously risky, 7 was minumum, 8 is nice and 9 offers a safety margin.

I'm up for a Bo Derek 10 tho' if she is willing!

ER34GTT · 4th August 2005, 05:25 PM

5 Cant be that bad... it's a coldair intake and keep in mind that I do live in ICEland so I am realy not dealing with 30deg C all day long...

Quote from the NGK website:
----------------------------
Your Vehicle:
1998.5 - 2001.6 NISSAN SKYLINE 2500 TURBO RB25DET
Spark Plug Part No.
Recommended Plug PFR6G-11
Iridium Option BKR6EIX-11
----------------------------

By the way, is 5 hotter or colder than 6?..
I keep mixing this up with the Denso ones...

Thanks for your reply!
Tomas

Pikey · 4th August 2005, 05:45 PM

Put 6s in it.

6 is colder than 5, you need colder plugs the harder the engine is being worked.

I would put 6s in, unless you're running more boost, in which case Id suggest a 7.

ATCO · 4th August 2005, 06:34 PM

Pikey is right. The higher the number the colder the plug (nose is more recessed). Whilst the air may be colder (for you) its still hot in the engine and you need to run a plug not only based on ambient but also the internal to engine conditions. Turbo engine, especially with higher boost will need the colder plug. Based on your boost you might also want to think about plug gap as well, the "-11" means you are running a big gap, fine on standard boost, not so if you have the wick turned up!
DaveG

R32 Combat · 4th August 2005, 08:05 PM

Is .6 gap too small for 1.5bar boost?

Pikey · 5th August 2005, 08:27 AM

Wouldnt have thought so, although the standard is .8 isnt it?

tweenierob · 5th August 2005, 07:43 PM

What coils Andy?

Rob

R32 Combat · 5th August 2005, 09:59 PM

STD coils.

tweenierob · 6th August 2005, 08:36 AM

For your turbo application and boost IMHO .6mm is right, if you were running CDI or high power coils i would say bigger.

The difference between .7 and .6 can be the difference between missfire or not in my experience.

Rob

vicky · 6th August 2005, 09:15 AM

As you are practically standard Thomas i would go with a 6 or 7 heat range and 0.8mm gap. NGK do a plug ready gapped to this specification. Cant recall the part no. now but a search on here or SOC would definitely reveal it.

R32 Combat · 6th August 2005, 09:53 AM

Ta Rob, that was my thoughts too.

skyliner32 · 6th August 2005, 08:41 PM

Colder plugs will reduce engine power unless you really need it.
6-7 should be OK for light tuned engine.

4th August 2005, 04:05 PM	#1 (permalink)
ER34GTT GTR Register Member Join Date: Jun 2005 Location: Iceland Posts: 33	Your thoughts on NGK BKR5EIX-11 Hi! Following a discussion on iridium spark plugs... I just wanted to know if any of you have any thoughts on NGK BKR5EIX-11 plugs for a R34 GTT Skyline, only mod is a Apexi intake. To Hot or to Cold? If so, any recommendations? Thanks for that! Tomas

4th August 2005, 05:25 PM	#3 (permalink)
ER34GTT GTR Register Member Join Date: Jun 2005 Location: Iceland Posts: 33	5 Cant be that bad... it's a coldair intake and keep in mind that I do live in ICEland so I am realy not dealing with 30deg C all day long... Quote from the NGK website: ---------------------------- Your Vehicle: 1998.5 - 2001.6 NISSAN SKYLINE 2500 TURBO RB25DET Spark Plug Part No. Recommended Plug PFR6G-11 Iridium Option BKR6EIX-11 ---------------------------- By the way, is 5 hotter or colder than 6?.. I keep mixing this up with the Denso ones... Thanks for your reply! Tomas Last edited by ER34GTT; 4th August 2005 at 05:28 PM.

5th August 2005, 07:43 PM	#8 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,833	What coils Andy? 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!

6th August 2005, 08:36 AM	#10 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,833	For your turbo application and boost IMHO .6mm is right, if you were running CDI or high power coils i would say bigger. The difference between .7 and .6 can be the difference between missfire or not in my experience. 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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4th August 2005, 04:15 PM	#2 (permalink)
ATCO New Users Join Date: Feb 2003 Location: West Sussex Posts: 1,939	I know its a GT-T, but a 5? I thought 6 was seriously risky, 7 was minumum, 8 is nice and 9 offers a safety margin. I'm up for a Bo Derek 10 tho' if she is willing!

4th August 2005, 05:45 PM	#4 (permalink)
Pikey GTR Register Member Join Date: Feb 2004 Location: Cheltenham Posts: 4,151	Put 6s in it. 6 is colder than 5, you need colder plugs the harder the engine is being worked. I would put 6s in, unless you're running more boost, in which case Id suggest a 7.

4th August 2005, 06:34 PM	#5 (permalink)
ATCO New Users Join Date: Feb 2003 Location: West Sussex Posts: 1,939	Pikey is right. The higher the number the colder the plug (nose is more recessed). Whilst the air may be colder (for you) its still hot in the engine and you need to run a plug not only based on ambient but also the internal to engine conditions. Turbo engine, especially with higher boost will need the colder plug. Based on your boost you might also want to think about plug gap as well, the "-11" means you are running a big gap, fine on standard boost, not so if you have the wick turned up! DaveG

4th August 2005, 08:05 PM	#6 (permalink)
R32 Combat New Users Join Date: Jan 2004 Location: Berkshire Posts: 4,357	Is .6 gap too small for 1.5bar boost?

5th August 2005, 08:27 AM	#7 (permalink)
Pikey GTR Register Member Join Date: Feb 2004 Location: Cheltenham Posts: 4,151	Wouldnt have thought so, although the standard is .8 isnt it?

5th August 2005, 09:59 PM	#9 (permalink)
R32 Combat New Users Join Date: Jan 2004 Location: Berkshire Posts: 4,357	STD coils.

6th August 2005, 09:15 AM	#11 (permalink)
vicky GTR Register Member Join Date: Aug 2004 Location: South West Posts: 212	As you are practically standard Thomas i would go with a 6 or 7 heat range and 0.8mm gap. NGK do a plug ready gapped to this specification. Cant recall the part no. now but a search on here or SOC would definitely reveal it.

6th August 2005, 09:53 AM	#12 (permalink)
R32 Combat New Users Join Date: Jan 2004 Location: Berkshire Posts: 4,357	Ta Rob, that was my thoughts too.

6th August 2005, 08:41 PM	#13 (permalink)
skyliner32 GTR Register Member Join Date: Feb 2004 Location: Yorkshire Posts: 689	Colder plugs will reduce engine power unless you really need it. 6-7 should be OK for light tuned engine.