Spark Plugs

[blaikier33]

i just a nisstune ecu and we put in ngk iritop 7, bcpre stock no-5601. .8 gap and ime happy

[Cowboy1600]

Good read.

One thing I would like to chuck into the ring is the performance side of things.

I remember when I switched to iridiums in my CBR900. Holy shit. SOP dyno said 5hp right thru the rev range. And it wasn't just the switch from old to new plugs as I had done that 10 times before going iridiums. And throttle response was markedly improved. It help with the throttle hand/rear tyre connection something fierce.

I've been an advocate of iridiums ever since.

Why am I surprised that people don't report better performance with iridiums over copper in their cars?

I picked up some iridiums this week. Will chuck em in with fresh oil next weekend and report back.

[ryan101]

ok ok very confused after reading all that!

i have brought new coil packs, and i want to change the plugs at the same time and the coils!

my car is r32 with rb25det s2 simple mods fmic, fuel pump, full 3inch exhaust and a hi low boost control 7 and 10psi

i drive mainly on 7psi!

what plugs and what gap?

thanks

[R33S2]

The plugs in the first post as they are the standard replacement, up to you whether its copper or iridium gaped at 1.1.

[boostn0199]

ok ok very confused after reading all that!

i have brought new coil packs, and i want to change the plugs at the same time and the coils!

my car is r32 with rb25det s2 simple mods fmic, fuel pump, full 3inch exhaust and a hi low boost control 7 and 10psi

i drive mainly on 7psi!

what plugs and what gap?

thanks

The rule of thump, with those mods you run bcpres6 copper ones and if you boost past 13-14 go 1 colder and get bcpres7

[Black_CSR]

I put BPR6E-11 on my RB25DET.. this ok?

[joeyjoejoejuniorshabadoo]

no need for confusion really...

90% of people on here and pretty much every tuner i have spoken to use and reccomned either BCPR7ES gapped @ 0.8 or BCPR6ES gapped @ 0.8

use that and you will be fine

its not that iridiums aren't better also.... its just that in a modified environment they can die just as quickly as coppers and offer no real gains other than the price

[Sheriff Wan]

Well put joeyjoejoe!

No need for the cunfusion - I have BCPR7ES in mine running 15 psi - RB25DET SII

[Humbla]

Well put joeyjoejoe!

No need for the cunfusion - I have BCPR7ES in mine running 15 psi - RB25DET SII

Same,change em every 20,000.

[SlowSkyline]

Fixed my missfire that i had for 5 months by putting in BCPR6ES at .7 gap, had iridiums in before at at heat range 7 and .7 gap and they were shit, but most likely due to car running really rich for so long.

[jjskyline79]

Put platinum ones in mine about 3 years ago done about 65k still fine checked at each oil change or service

Running light mods and .85 bar boost no problems no miss fire best plugs i've bought so far but a bit expensive

thought id try them after I was surprised they lasted over 160k in my astra 2.2 coupe (holden)

Edited April 30, 2010 by jjskyline79

[KrazyKong]

I bought a six pack of Bosch Platinums today from Super Cheap. Cost me about $38. They are the FR7DPX ones. Has anyone used these before? They are pre-gapped at 1.1, but keep reading on here folks going for a 0.8 gap. Have read things in this huge thread and will continue to do so. But so far seeing way more references to NGK coppers vs anything Bosch.

[Galois]

yeah, everyone seems to love the nkg's. but when it comes to gapping, if you're pretty stock then 1.1's will prob be ok. it's like oil tho, different for every car, and might take a few changes to get the perfect setup. just listen out for a miss

[Black_CSR]

My car missed late @ Night when it was 5 degrees or something.. it's running 16psi on BP6E11.. but during the day it's fine... u reckon i should switch over to 0.8 gap??

I read here that keep the gap as big as possible.

[Galois]

probably want a smaller gap with 16psi, the higher the pressure, the more potential to "blow out" the spark, or at least create an environment where spark generation is difficult

[Ultimategtr]

Mines just started misfiring around 4.5-5k. Im running splitfires and BCPR7ES and on a hybrid turbo runnin 8psi.

Plugs are due for a change anyway.

[Ultimategtr]

found my cause of misfire, 2 of my coils were missing the spring, and as a result there was some white powder stuff on top of the plug and in the coil at the base.. cleaned out and with new springs and plugs fixed my missfire.

[Galois]

was taping up my coilpacks to try to solve a missfire while i save for yellow jackets and had a look at the spark plugs, only to find them very very black. I'm using ngk bkr6es plugs with standard 1.1mm gap and they have about 3500km's on them. do i need a higher heat rating? or is it running rich or something?

car is a stockish r34 gtt with 3.5" catback somehow boosting to 12-13psi (still trying to figure out why that is)

Edited June 20, 2010 by Galois

[KiwiRS4T]

If you have dodgy coils try gapping your plugs down to 0.8 til you get new ones. Could possibly explain why they are so black (don't all RBs run rich from stock?) or if you're keen try some NGKBCPR5ES

[Galois]

wouldn't i go for bkr7es (or bcpr7es) for the colder plug? or am i getting confused?