Spark Plugs

[SargeRX8]

Rather than obviously starting a new thread here is my plan.

I plan to be running about 17 - 20 psi with a flow rate of about 500hp(imagine a 3076r). Would the turbo blow out the spark from the standard coil packs?

I plan to buy all the gear I need when I fit the turbo in so I don't want to install it then have something break then have to buy something else.

Someone tell me what I should get. I'm looking at yellow jacket coils, Ive heard good things and they are cheap compared to others out there. Now the plug. People say run a smaller gap when at higher boost but if you run bigger coils run the bigger gap. I'm planning ahead for all this and need my gear ready. Should I go out and buy my self a set of 1.1mm? Anyone suggest which spark plugs I should get? I'm not too keen on changing plugs every 5000km.

I'm estimating about 280 - 300rwkw.

[Galois]

You'll probably need to go aftermarket, they're only about $400 and running that boost will be pushing 15 yo coil packs. Yellow jackets are seemingly as good as splitfires (they've been round a while now and still going strong), with 2 years warrenty and for 2/3's the price.

Changing spark plugs every 5-10k km is something that you'll probably have to live with, esp running on much boost. Plenty of people like that at least changing that regularly they are monitoring cylinder conditions that regularly too, gives you a heads up if one plug is fowling too often.

You'll probably have to go 0.8mm gap for that boost, it seems to be what most people do. I'm not sure if that'd be a 7 or 8 heat range, but for 7 i'd go with bcpr7es/bkr7es or fr8dp (bosch plats for cheap)

If you want any more info for this power range look at the dyno thread.

[SargeRX8]

Alright well I'm getting a set of yellow jackets. After re reading the thread alot of people here are using a 1.1 gap when running better coils. Should I do the same or should I jump to 0.8?

I don't really feel like buying plugs, fitting them to see they work like dick then buying another set again.

Ill be sticking with a 7 heat range as 6 I recall being stock and the cooler ones respond better with more power. Gonna buy my self a bulk lot of copper plugs and change them every second time I do an oil change or when I notice pops and misfires.

Also what do people do when monitoring their cylinder conditions? Do you mean conducting a pressure test every time you change the spark plugs? Pretty sure you'll be ending the life of the cat converter pretty quickly.

To sum up all my shit,

What plugs should I get? 300rwkw 18psi rb25det with yellow jackets?

[DVS JEZ]

Its always best to run the biggest spark gap possible. Try 1.1mm bkr7es11. The reason we run a colder plug with higher powered engines is for safety. More power means more heat and if the combustion temps start to make the spark plus glow ( which happens) than the glowing plug can ignite the fuel/air mixture before the spark plug is ready to fire. This is called pre ignition. Which will kill ur motor within seconds.

Imagine the piston trying to travel up the bore and the flame burning above it trying to push it back down. = not good

[DVS JEZ]

To monitor cylinder conditions u need to read the spark plugs condition.

[joeyjoejoejuniorshabadoo]

IMHO just run splitfires with BCPR7ES gapped @ 0.8

it's the moset tried and tested combination for an RBxx motor

i've been pushing 300rwkw for years with this setup

[R.3.2.G.T.R]

IMHO just run splitfires with BCPR7ES gapped @ 0.8

it's the moset tried and tested combination for an RBxx motor

i've been pushing 300rwkw for years with this setup

same here, tuner recommended bcpr7es with more boost

[Galois]

Also what do people do when monitoring their cylinder conditions?

To monitor cylinder conditions u need to read the spark plugs condition.

Yep, the condition of the spark plugs can tell you a lot about how the engine is running. ie if they're a little covered in soot that's normal, if they look like they've been damaged by heat, or they're covered in a thick layer of unburned fuel (soot) then you're getting a warning before things go wrong.

Splitfires are more widely used because they've been around longer than yellow jackets. It's probably true that there have been more problems with yellow jackets, but the people with yellow jacket problems just get sent a new coil/coils under warranty. If you want confirmation of who's using what making your power, just look at the dyno thread.

[Gonzola]

For what it's worth to whoever; I had a misfire issue which would start from ~4000rpm and cause issues anywhere from here on up, which is where the car starts to make decent boost.

Car has splitfires & new coil pack wiring harness - runs Vipec management and makes 500rwhp.

It was running BCPR6ES-11 (ie 1.1mm)... put a new set of the same plugs in. No help.

Pulled the 'new' plugs and gapped to 0.8... changed misfire from big bangs and cracks under load to short fast pops.

Had pondered and checked up on a lot of things, swapped igniters with a mate, was going to swap CAS, splitfires, loom, etc

Today threw in a set of BCPR7ES plugs, gapped to 0.8... misfire instantly gone. Pulls hard from 4500-8500rpm in all gears, well... maybe not 8500 in 5th hahah but you get the idea.

Happy as f**k now... back to dishing out bulk chop

Hopefully that can help someone too.

[Torques]

I have the same plugs (though with a 2nd electrode) but no complains from my side.

Cheapest option, copper, tried, tested, and proven

[jhjones]

Hey guys, would 1.1mm gap be ok for my rb20e?

[Beer Baron]

yep should be perfectly fine.

[jhjones]

yep should be perfectly fine.

Ok, gonna attempt to change the spark plugs tomorrow to fix this misfire.

Edited June 8, 2011 by H4x

[Black_CSR]

What do u guys think of NGK Iritop spark plugs??

[aussietroy]

ok, firstly, i know this is in the forced induction thread but im getting no replies in the N/a one D:

Im looking at a, well over due, new set of plugs my 32 N/a

anyone bought off ebay ?? alot cheaper and was lookin at getting a set of these

http://www.ebay.com....23048a3aa1#shId

any feedback on them ?

cheers

[GODZILLA-GTR]

i just bought BCPR6ES-11 for my R32 GTR, has standard coilpacks. do i chuck them in at 1.1 or do i gap them to .8 straight up? Thanks in advance

[SiR_RB]

Depends how good ur coilpacks are.

Mine were fine at 14psi and 1mm gap, but higher psi I had misfire problems so I changed my coilpacks and now I run a 1.1mm gap with 18psi.

Try it at 1.1pm and see how it goes

[Galois]

Spark plug rule: run the biggest gap you can without misfiring

[GODZILLA-GTR]

cheers boys

[dori34]

Been running BCPR6ES .8mm gap in a RB25 neo pushing 247rwkw for around 6 months.

been getting an occasional missfire in high revs (1st & 2nd gear) so not sure if its plug related, but i'll be switching to BCRP7ES .8mm as recommended by a few ppl in here so hopefully fixes the problem.