I was unable to find anythreads directly comparing these plugs to eachother, so I'm asking for help. I have a d15 on a wet 75 shot of NX and need new plugs since one of my Zex plugs broke. Never had a problem with them and have been great for NA and on the bottle, but since I need some new plugs I was looking at what my options are. I see a lot of people are using the NGKs and some are using ZEX, is there a difference in quality? I liked the ZEX plugs since they have the three grounding straps, but do the NGKs? And for my d, does anyone have a part number for the NGKs that are 2 steps colder, I think that would be a 7 heat range, right?

Thanks for any help you can give.

 

i think the zex plugs suck i used them once and the tips broke off when i was spraying on my b16.. never used them again

 

always ngk

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quicksilver1689 &raquo;</TD></TR><TR><TD CLASS="quote">always ngk</TD></TR></TABLE>

ftw

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by red02s2k &raquo;</TD></TR><TR><TD CLASS="quote">i think the zex plugs suck i used them once and the tips broke off when i was spraying on my b16.. never used them again</TD></TR></TABLE>
That's how mine broke too! One of the ceramic coatings around the center electrode broke off, luckily it was caught by the grounding straps and none of it got into my motor.

So does anyone have the part number for the NGKs for my D15? I'm running a 75 shot so I'll want to go two steps colder. Please help me out I couldn't find what I was looking for on their site.

Thanks again

 

zex plugs are garbage, every set ive seen in a turbo car the porcelain fell off the electrode

 

zfr5fs are the oem ngks so im assuming zfr7f would be the heat range 7 plugs.

or maybe you can use the bkr7e. i know thats what alot of us are using. only difference i see is that the bkr7e is projected tip while zfr7f are projected extended tip. not sure if that matters or not.

also what d15? b7 i assume? and are you sure you need to go to 7's. ngk rule of thumb is one heat range for every 75-100 hp increase.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dpetro1 &raquo;</TD></TR><TR><TD CLASS="quote">zfr5fs are the oem ngks so im assuming zfr7f would be the heat range 7 plugs.

or maybe you can use the bkr7e. i know thats what alot of us are using. only difference i see is that the bkr7e is projected tip while zfr7f are projected extended tip. not sure if that matters or not.

also what d15? b7 i assume? and are you sure you need to go to 7's. ngk rule of thumb is one heat range for every 75-100 hp increase. </TD></TR></TABLE>

BKR7E work well.

 

The motor is just a D15B... no number, it's non vtec also. I've always read 2 heat ranges colder, so that's why I said that, but then again that's the reason I'm asking these questions.
Can anyone else tell me if I need to go to the 7s or just go with the 6s? Is it bad to go a little colder just to be safe?

 

too cold can foul the plugs more quickly but i guess that better than pre-ignition. you ill probably be fine with the 7's

 

ngk for the win

 

Alrighty thanks for the help.
I called up NGK to get my part numbers and they guy said for my D15 I could use the BCPR7ES-11 (part# 1095) which are the standard plugs or the BCPR7EIX-11 (#5691) which are the iridium plugs. I have been reading a lot of people have been using the BKR7E-11 (#1283) so my questions are as follows...

Are Iridium plugs ok to use on nitrous cars? I have been told no by a few people, but I just read a post about it and people said they were fine. My thought is the thin projecting tip of the Iridium plug may melt or brake off

What are the BKR7E plugs? I have heard they were NGKs racing plugs. Will they work in the D series motors? How are they different compared to the other BCPR7ES plugs?

Lastly, gapping. I'm thinking .030-.033 what do you guys think??

Thanks again for the help.

 

The bk's are not a projected type of plug. Why they are used more I dont know. I use them too. Look on the NGK website all those #'s and letters all mean something, you can break each letter down to compare the differences. I think the Bkr7e's come with a .28-.30 gap right out of the box which is what most people run.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Crx Jimmy &raquo;</TD></TR><TR><TD CLASS="quote">The bk's are not a projected type of plug. Why they are used more I dont know. I use them too. Look on the NGK website all those #'s and letters all mean something, you can break each letter down to compare the differences. I think the Bkr7e's come with a .28-.30 gap right out of the box which is what most people run.</TD></TR></TABLE>

pretty sure the bkr's are the v-power. not really sure if they are much different than the bcpr's. and unless there is a -# (ex: -11) then there isnt really a preset gap.