NGK Extended Reach Spark Plugs

[PaulMP3]

My reply:

"My friend said that he has the extended reach plugs with a heat rating of 7. He said the stock number is 2975."


NGK reply:

"That spark plug is a v-power design and not recommended for the application. This could directly affect engine performance and ignition performance."

Interesting... can anyone else confirm this is the stock #... maybe the guy gave me the wrong #.. i will be picking them tonight if i get a chance to go out. i will check the box for this #. The guy actually asked if these plugs were for a motorcycle

 

[Spooled]

Interesting... can anyone else confirm this is the stock #... maybe the guy gave me the wrong #.. i will be picking them tonight if i get a chance to go out. i will check the box for this #. The guy actually asked if these plugs were for a motorcycle

I wonder why they wouldn't have a 7 heat rating on that plug. I would like to try the extended reach plugs with Iridium-IX coating and a heat rating of 7.

 

[igdrasil]

The ZFR7F-11 are 7 heat range.

SOme people dont recommend them for high compression engines that has pistons with a DOME that may hit the plug.

 

[MinnowGT]

yes 2975 is the part number for the zfr7f-11

http://www.sparkplugs.com

has a good database of spart plugs. you can even find if they are
stock on any cars to make going to the store easier.

btw. zfr7f-11 isn't listed as stock on anything.

 

[LinuxRacr]

yes 2975 is the part number for the zfr7f-11

http://www.sparkplugs.com

has a good database of spart plugs. you can even find if they are
stock on any cars to make going to the store easier.

btw. zfr7f-11 isn't listed as stock on anything.

This is where I got mine from. They are called Monarch Products.

 

[acidbug]

Are they really making a difference wiht the extended reach spark plugs? I don't see how or why!

chas

 

[Spooled]

Are they really making a difference wiht the extended reach spark plugs? I don't see how or why!

chas

I think someone on here had a link to a Miata website talking about that. Supposedly it moves the start of the flame front to a more advantagous position. It may also increase compression minimally.

The rep from NGK mentioned that the v-power design "is not recommended for the application." I am going to press them a little and see if they have a reason for saying that, or if it's just a disclaimer because they have no idea.

 

[Spooled]

More info from NGK:
"The engine, ignition system and engine management system are designed to use a fine wire spark plug. The fine wire spark plugs have improved ignitability, anti fouling, lower voltage requirements and less quenching. The v design won't ignite as well and directly affect engine performance. In addition to this you won't burn as much of the A/F mixture and if you have an emission test you may fail.
In addition to this a spark plug is a wearable item. The precious metal spark plugs will hold up in this application, were as the nickel alloy spark plugs will wear very quickly."

 

[acidbug]

I think someone on here had a link to a Miata website talking about that. Supposedly it moves the start of the flame front to a more advantagous position. It may also increase compression minimally.

The rep from NGK mentioned that the v-power design "is not recommended for the application." I am going to press them a little and see if they have a reason for saying that, or if it's just a disclaimer because they have no idea.

ok..but why would you want to higher the compression on our protege? That's the opposite of what's needed in a FI Application!
(uhm) (scratch) (braindead

 

[Spooled]

ok..but why would you want to higher the compression on our protege? That's the opposite of what's needed in a FI Application!
(uhm) (scratch) (braindead

You're right, but raising the compression will always give you more power (until you detonate). People lower the compression so they can turn up the boost.

 

[Spooled]

More updates:

From me:
"Also, I don't want to hassle you too much, but I have one more question. Can you recommend the ideal spark plug/gap if I can give you engine specifics?
Here is a link to what I have:

http://www.mazdausa.com/MusaWeb/displayPage.action?pageParameter=modelsS

pecsSpecs&vehicleCode=PRZ

I have the boost set at 8-9psi, but will be turning it up when I get a better intercooler and something to tune the fuel to match. I run 92-93 octane fuel. The plugs that I'm running right now are BKR7E. I don't remember off hand what I gapped them at, but it was to stock specs. The idle is rougher than the stock platinum plugs. I wanted to stay away from anything that could cause pre-ignition, but I also want something that will last and have a smooth idle. You seem to really know your stuff, and I'd like to see what you recommend."

From NGK:
"I would highly recommend the BKR7EIX stock number 2667. These are available colder if you need them. However it's up to you to determine the correct heat range for your application. This spark plug will give your the performance of the OE style yet be cold enough for your application. Set the gap .002" less then the factory recommended gap."

 

[Spooled]

I am always skeptical about companies pushing a new product, but I may try these out and see what happens. Plugs are cheap.

 

[PaulMP3]

I would highly recommend the BKR7EIX stock number 2667. These are available colder if you need them.

these are 2 steps colder than stock correct??? also he mentions to gap them .02 lower than stock, which would be .30 correct?

I am skepticle about putting in my extended reach plugs.. i think i might hold off on them.

 

[igdrasil]

I have tested in my car the following sparks:

ZFR7F-11
BKR7E
R5672A-8

And what I have to say:

The ZFR7F are great, havent tested it much, only 1 month, they are extended reach so the slight advantage may not be so evident.
The BKR7E is what I had installed when I first installed the turbo. They work just as good as the ZFR7F,
The R5672A-8 is for Racing purposes, they are not resistor type so the ignition noise will be transmitted thru the speakers and the other electronic devices. But the are DAMN great. Used it for 8 month @ 7psi with no problems. This one was colder (8 heat range) so on high temps and high loads and high crazy boost this spark is great.

I would say, get 8 heat range plugs if people plan to raise boost without engine management, its around 300F colder than the 6 heat range and 150F from the 7 heat range

Having the correct spark plugs with the proper gap is essential. In my opinion, it is good to pick up at least 2 sets of copper NGK ZFR7F-11 plugs. In theory the copper will help to protect your engine by melting or blowing off in the event of a bad tune that is too lean or with the timing too advanced resulting in detonation.

 

[SImp3]

Just put the zfr7f-11 in the car, seems to respond better, but kinda hard to tell on hard pulls since the stock clutch is going and haveing trouble get the boost up.

 

[igdrasil]

My Reviews:

Good for stock boost on mazdaspeeds and 6-7psi on modded proteges.

In my case: Got some heavy detonation @10psi, good enough to **** up my turbo!!!!!!!! Yes, my turbo is dead!

If you people plan to turn up the boost above the recommendations, you better not use ZFR7F-11.
Im not blaming the plugs because I mostly did 7-8psi on the R56 plugs and sometimes 10psi, but, I wouldnt use them from now on that I will be boosting 10psi-and above of boost

Check them sfter a couple of months only:

This was taken from the leanest piston, #4, See the blue arrow? That piston was running LEAN! See how white is compared to others. Check the green arrow; heat was reaching that far.

Some heat build up but not the whole tip like the one above, and some detonation. This was taken from the 2nd piston.

This was a good spark, small gap, 8grade R5672A-8, shows rich mixture, a bit of wear, of course, 8 months boosting without checking them!!
These were installed before the ZFR7F.

 

[CustomMSP]

DAMN! Sorry to hear that. Not good. I have them installed and running about 9psi daily on my MSP. The car does feel a lot better, more responsive ever since I installed the plugs about 2k miles ago, especially off boost. It still backfires like crazy in lower rpm...so It must still run rich, I'm not sure about high rpm though. I guess I'll have to check them out soon. Thanks for the heads up.

 

[igdrasil]

Yeah I just need colder plugs...because Im the one that doesnt like to run pig rich.

 

[PaulMP3]

im tired now.. but since i put the extended reach plugs in i have had radom breaking up at 10-12 psi at 6k. im not sure if it is my timing map or the plugs, but im back down to 8psi for now.. Im gonna swap them out soon to see the outcome. I believe i am mis firing not detonation. only happen a few times, but enough to scare me.

igdrasil what happen with ur turbo???

 

[YP5 Toronto]

so....what would be a good "alternative" to the Extended Reach Plugs?