NGK spark plug differences...

[redlinetuning]

NGK bkr7e (4644) vs. NGK R5671A-7 (4091) plugs.

Are there any advantages running the #7 plugs?

I was using bkr7e plugs before and noticed the plugs had some white residue after ~1100 miles on the tune. Oil was changed 2x and decided to go to the NGK R5671A-7 plugs. I've only had about 5-600 miles on the new plugs and they look almost new. Both were gapped in at .025

My dyno session was rescheduled due to some back-ordered parts for fuel conversion so I decided to order an extra set of R5671A-7 plugs for the dyno day just in case. Not a huge difference from the bkr7e plugs in price difference (~$1) more for the #7 plugs.


This is for my turbo b16 setup, going E85 @14+psi, boost by gear.

[inspector01]

I believe those are the non-resistor plugs, which in theory can make more power but can cause electrical interference, mainly just with homodata. I tested the resistor vs non-resistor plugs back to back on a ~330 hp H22 and lost ~10 hp with the non-resistors.

This is all off the top of my head, I may be wrong on those plugs, I'll check next time I'm on a computer.

[redlinetuning]

Yes, these are non-resistor plugs. Suppose I could ask my tuner to test them out with the bkr7e plugs at the same time I'm on the dyno to see what the hp differences are. I haven't found much info on them either.

[inspector01]

I saw a few tests awhile back where they were gaining like 30-40 hp on ~400 hp setups, but I think more people would use them if they gained much. As I said, I lost ~10 hp on a ~330 hp setup. I'll try and test again sometime. Also hondata is insistent that you can't use them with their system so take that into consideration.

[redlinetuning]

I saw a few tests awhile back where they were gaining like 30-40 hp on ~400 hp setups, but I think more people would use them if they gained much. As I said, I lost ~10 hp on a ~330 hp setup. I'll try and test again sometime. Also hondata is insistent that you can't use them with their system so take that into consideration.

I wonder if that's why I keep burning through c14 on my ecu main board? I've lost one p28 board and second board was reconditioned since using these plugs.

[Shane@DBPerformance]

If you want to run a 7 heat range plug then run the BKR7E, people only go to the non-resistor usually because they want to run a colder 8 or 9 heat range and there isn't a BKR8E and the Iridium 8s/9s are crazy expensive. Non-resistor plugs are not meant for modern computer controlled cars though, they can cause some electrical and misfire issues, but people still do run them on Hondas.

[redlinetuning]

Shane, thanks for the info. I've already ordered another set of R5671A-7 today. I could probably still cancel the order and get the BKR7E instead.

So you would recommend the BKR7E plugs instead? I was up there last week looking for the boost solenoid for Hondata and some other couplers in the white civic.

[Shane@DBPerformance]

I would run the BKR7E.

[redlinetuning]

Shane, you have pm.

[Meatball_EG6]

I'm running NGK BKR6E-11