Hi can anyone tell me if these plugs will fit my zed please NGK iridium Ix BPR7EIX 4055

Edited August 29, 201411 yr by leeroy73

NGK bloody phone

is you car a turbo? and what boost you running am running 14psi on stock turbos and use this spark plug one cooler that stock http://www.ebay.co.uk/itm/Z32-300ZX-6x-Uprated-Colder-NGK-Iridium-Spark-Plugs-HR7-/110730549948?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item19c80e1abc

Yes turbo I've used some similar before but can't find them on my eBay it was while ago so they will fit

theres the link to them there http://www.ebay.co.uk/itm/Z32-300ZX-6x-Uprated-Colder-NGK-Iridium-Spark-Plugs-HR7-/110730549948?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item19c80e1abc

 

- - - Updated - - -

 

is you car stock or not

Stock turbos pretty much same as yours so will they fit? I've noticed that there 14ml socket size ...

Edited August 29, 201411 yr by leeroy73

Bkr7eix.

 

Can get them for less than £40 delivered for 6 if you have to use iridiums.

Edited August 29, 201411 yr by Noz

Why??? The 300zx TT uses a specially designed plug, made for Nissan by NGK, and is matched to the engine. NGK is on the record as saying none of the Iridiums match up to the oem plug, and will not recommend any Iridium for liability reasons. So why not stick with what Nissan's engineers decided was best? The Platinum PFR6B-11B is the "cold" plug.

 

Just my opinion, and honestly platinums are cheaper anyway.

A different view from SZ:

 

http://specialtyz.com/shop/default/300zx/ngk-iridium-ix-spark-plugs.html

Why??? The 300zx TT uses a specially designed plug, made for Nissan by NGK, and is matched to the engine. NGK is on the record as saying none of the Iridiums match up to the oem plug, and will not recommend any Iridium for liability reasons. So why not stick with what Nissan's engineers decided was best? The Platinum PFR6B-11B is the "cold" plug.

 

Just my opinion, and honestly platinums are cheaper anyway.

 

The PFR6B-11B is NOT a cold plug. It is fine for a brand new stock engine. Posted loads on this, will put links on this thread when I get chance.

I understand you have a lot more experience with these cars than I, but I have to trust the service manual without compelling evidence otherwise. Per the Service manual-

 

Spark plug (Platinum-tipped type):

Non-turbo Turbo

Standard type PFR6B-11 PFR5B-11B

Hot type PFR5B-11 PFR5B-11B

Cold type PFR7B-11 PFR6B-11B

 

The European Manual has a completely different plug for the Turbo (go figure)

 

Spark plug (Platinum-tipped type):

Non-turbo Turbo

Standard type PFR6B-11 PFR6B-11C

Hot type PFR5B-11 PFR5B-11C

Cold type PFR7B-11 PFR7B-11C

 

Not that it matters, all the -11C plugs are discontinued.

 

Z1 Motorsports sells the PFR6B-11B and state it is the cold version- http://www.z1motorsports.com/product_info.php?products_id=1621

 

Most importantly from what I read about the design of the OEM plug (extending the tip 1 cm into the combustion chamber) not being replicated by any other plug, I want to stick with the platinums. Just installed a set, they should be replaced every 60,000 miles and if NGK stops making them will I be hosed? I don't expect that to be an issue, drive it about 3,500 miles a year, am I still going to have it in 17.14 years?. I will be 70 then.

 

But I digress. From my more limited knowledge (but lots of reading trying to chase down detonation issues) the PFR6B-11B is the oem recommended cold plug.

NGK is on the record as saying none of the Iridiums match up to the oem plug, and will not recommend any Iridium for liability reasons.

 

Where is this on record?

I understand you have a lot more experience with these cars than I, but I have to trust the service manual without compelling evidence otherwise. Per the Service manual-

 

Spark plug (Platinum-tipped type):

Non-turbo Turbo

Standard type PFR6B-11 PFR5B-11B

Hot type PFR5B-11 PFR5B-11B

Cold type PFR7B-11 PFR6B-11B

 

The European Manual has a completely different plug for the Turbo (go figure)

 

Spark plug (Platinum-tipped type):

Non-turbo Turbo

Standard type PFR6B-11 PFR6B-11C

Hot type PFR5B-11 PFR5B-11C

Cold type PFR7B-11 PFR7B-11C

 

Not that it matters, all the -11C plugs are discontinued.

 

Z1 Motorsports sells the PFR6B-11B and state it is the cold version- http://www.z1motorsports.com/product_info.php?products_id=1621

 

Most importantly from what I read about the design of the OEM plug (extending the tip 1 cm into the combustion chamber) not being replicated by any other plug, I want to stick with the platinums. Just installed a set, they should be replaced every 60,000 miles and if NGK stops making them will I be hosed? I don't expect that to be an issue, drive it about 3,500 miles a year, am I still going to have it in 17.14 years?. I will be 70 then.

 

But I digress. From my more limited knowledge (but lots of reading trying to chase down detonation issues) the PFR6B-11B is the oem recommended cold plug.

 

There is only so many times I can post the same reasoning behind the requirement for various heat grades & material composition of spark plugs. Been through it so many times, just because Nissan & NGK made a deal it doesn't change the fact that platinums are designed for longevity (60k service intervals) in a brand new stock engine. So yes, I agree 100% that the PFR6B-11B is the OEM recommended plug.

 

Thankfully, we don't have to fit them as there are options that are more appropriate for different specifications of engines. BKR7E, BKR7EIX, BKR8EIX & BCR8ES being just four that work perfectly. I run BCR8ES in mine at 1.7 bar on twin GT2870 churbos, and they are much shorter than PFR6B. Same set has seen umpteen dyno & 1/4 mle pulls and many hours of mapping. Jaffa runs them in his at 700whp. They are perfect for our needs. PFR6B are not :)

Edited September 1, 201411 yr by Noz

Where is this on record?

 

http://www.twinturbo.net/nissan/300zx/forums/main/view/906698/Iridium-Vs-Platinum-Plugs-Answer-from-NGKs-tech-Guy.html

[quote name=

Jon MacQuarrie

Technical Support Specialist]

 

---------snip-------------

 

We don't list an iridium spark plug due to the fact we don't make this exact

design in iridium. For liability issues we won't list an iridium spark plug

for this application due to it's special design. However by calling or

emailing we can make the recommendation of an iridium spark plug with less

projection, especially in modified applications. Of course the end user

will use at there own risk. In modified applications you don't want as much

projection as a daily driver so performance isn't an issue.

 

You can use the iridium spark plugs BKR series in this application. Again

it will have less projection then the spark plug originally designed for the

vehicle.

 

Jon MacQuarrie

Technical Support Specialist

 

Yes... Liable to have had their arses served to them by Nissan. No doubt contravening the agreement that was set up by the two companies, I assume (maybe incorrectly...).

 

Everything else he stated 10 yrs ago is in line with what I tell people that ask me about spark plugs in the VG30DETT: PFR6B-11C are fine for stock engines running stock boost. Increase boost/power, run a colder plug with less projection. The guy himself states BKR series plugs are suitable for modified applications :wack: