Changing Heatrange On Sprakplugs

[WogsRus]

ELO ELO

Question, how much differance does a heatrange change in a sparkplug make. I have BKR6EYA, but thinking of swapping to BKR7EYA.

The reason i want to do this, is that i have a Central 20 ecu, and has been tuned with safc to get correct air fuel ratio and some timming knocked out, but i still get some ping, well i think anyway. So possibly going to a 7 hetrange plug could help a bit? Allong with some more timming knocked out.

I have done a shit load of searches and can't fing much.

I have BKR6EYA, i was told to get these form this site. Are they the correct plug, i tried some BCPR6EYS but not as good for some reason.

Also can i run nor resistive plugs, so BK6EYA?

[MANWHORE]

I wouldn't run non resistor plugs.

Just for future reference, ngk have dropped the y on the end now. so the plugs are:

BKR6e; and

BCPR6e

those are the v grove ones.

the non vgrove are:

BKR6es; and

BCPR6es

If you hold the BKR and BCPR next to each other, everything below the thread is identical. The only difference between them is that the bit above the thread is about 2-3mm taller with the bcpr. Won't make a difference because it's absorbed by the coilpack spring.

When you're buying plugs, make sure you don't get the one with the -11 at the end. This means 1.1mm. This may have been the reason why it didn't feel as good? If you buy the 11, you'll have to regap them.

PS: I don't know the answer to your heatrange question, because i'm in the same situation.

But what they say, is every 50hp you increase above stock, you should increase the heat range.

Nissan recommend the 5 heatrange stock, which is about 130-140 rwkw.

I'm guessing that for around 200+, the 7 heat range is the better plug?

[WogsRus]

Yeah well i am getting abouit 190 rwks at 9 psi and then upward from there, peak 217 at 14 psi estimated, only pushed it to 207 at 12 psi on the dyno.

Thanks for the infor on the plugs. So basically if i am running BKR6EYA, they are now BKR6EA???? correct????

So what would you go for the BKR or the BCP??????

[siddr20]

Im in the same situation as well.. But in opp direction.

I have heat range of 7 atm, and i beleive (according to Sk) heat range of 6 is best suited for my car at this stage as im not running more than 10psi..

I might as well just buy the heat range 6 (BCPR6ES – 8) and test it out..

What you all think? or it wont make any difference?

[WogsRus]

I have 6 and theya re good, work really well, but i have run 14 psi and higher. Day to day is 12 or so so maybe i better try some 7's i mean it's $20 a set, who cares.

[MANWHORE]

nope, no a either. IT's just bkr6e or bcpr6e

ps: sid, there is no dash 8 on the plug when you buy it. If you get the bcpr6e, it is 0.8mm gap.

Edited February 18, 2007 by MANWHORE

[GTshortie]

The code for the NGK Coppers heat range 7 plugs gapped at 8mm is:

BCPR7ES = 0.8mm gap

BCPR7ES-11 = 1.1mm gap

Thats what SK recommended to me but i'm running 18psi and >200rwkw.

[WogsRus]

So for the BKR ones then

it's BKR7EA ???????????

[MANWHORE]

Guys stop creating confusion.

I'll clear it up once and for all.

BCPR plugs are recommended by nissan for the rb20 and rb26.

BKR plugs are recommended by nissan for the rb25.

The difference between both of the plugs are purely the difference in height ABOVE the thread. That is, it has no difference in how it runs. The coilpack spring takes up the extra height anyways.

GTShortie- the s on the end of the plug dictates standard plug. Having no s means that it's the v groove plug (better).

So basically, say if you want to use the heatrange 6, you have:

bcpr6es (standard plug 0.8 gap)

bcpr6es-11 (standard plug 1.1 gap)

bcpr6e (vgroove 0.8mm)

bcpr6e-11 (vgroove 1.1mm)

You get it now?

Same goes for the bkr:

bkr6es (standard plug 0.8 gap)

bkr6es-11 (standard plug 1.1 gap)

bkr6e (vgroove 0.8mm)

bkr6e-11 (vgroove 1.1mm)

Like I was saying, both bkr/bcpr are useable on either rb20/25/26. The extra height is ABOVE the thread, so doens't make any difference ot the running. the extra height is taken up by the coilpack spring.

There is no A in the plugs.

Edited February 18, 2007 by MANWHORE

[MANWHORE]

don't worry about getting confused. When I was looking for plugs about 2 months ago, I got crazily confused about all the different numbers. After heaps of research I worked it out.

[WogsRus]

OK OK OK, just asking cos i am about to buy some.

So i am getting BKR7E, the one with teh grouve in heatrage of 7, thanks.

Can you clear up however , at the moment i have BKR6EYA, so what does the A and the Y stand for

http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm

Ok but i am getting the ones i stated above, correct?

[MANWHORE]

hehe, it's cool. I'm trying to clear it up. lol, coz I got really confused myself a while ago.

The y stands for v groove. That means that the electrode actually has a groove cut in it so it looks liek a v. The ones you have atm are the vgroove. They are a better plug.

NGKs specs do have a y for the v groove, but when they make the plugs now, they seem to have dropped the y. Now when they print the s, it means no vgroove (standard). For the v groove, they don't print anything intsead of printing a y.

The v groove is supposed to allow you to run a larger gap and thus have a stronger spark as opposed to the standard plugs without the v groove. If you can't get the v groove, the standards are fine, but the v groove is a little better if you can wait to have them ordered in.

The A means special plug. I have no idea what sort of special it is. I have never seen the ya plug.

Basically, the plug that you've got in there atm is now known as the bkr6e. If you want to go up a heat range, it is now called the bkr7e.

If they don't have those available, and they only have the ones with the 11 at the end, i.e. bkr6e-11 or bkr7e-11, those are also fine. It just means that they have a 1.1mm gap, so you'll have to regap them down.

If you can't get those, the bcpr6e or bcpr7e are also ok. below the thread, that is, the important part of it is still the same (you can tell by holding it next to your old plug). The only difference, is the height of the collar above the thread is a bit taller, but the coilpack has a spring in it, so it's fine anyways.

[WogsRus]

thanks budy, gona get a set tonight, and put them in tomorrow to have a look.

[johnbarry88]

IRITOP 7 dont use and other plug in a rb20 or rb25det

[WogsRus]

which plug johnbarry88?

[johnbarry88]

NGK IRITOP 7

[MANWHORE]

Haha, you're going to get confused again mate. I'll try and help you.

NGK have iridium plugs.

Iridium plugs dodn't offer any performance gains. They are about 5 times as expensive and offer more than twice the life (in our high perfomance cars, the plugs get destroyed fairly quick). for $17 for an iridium or $4 for a copper, I know which one i'd go for.

Anyways, the standard iridium plugs have the same number as the copper plugs we buy except they have an ix at the end.

e.g. bcpr6eix or bkr6eix.

Note how I was telling you the last character set determines what sort of plug it is.

e.g. s is standard, ix is iridium, y (now nothing) used to be v groove.

Anyways, the standard iridiums oinly go up to a heatrange 6.

If you want heatrange of 7 or more, you need to go for their racing iridiums.

The racing iridiums come as iriway/iritop. The different names just correspond to the bcpr/bkr height above the thread.

So basically, the plug that he told you about is basiaclly the iridium version of the copper plug you're going to buy

Edited February 19, 2007 by MANWHORE