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Hi

I've got a R32 GTS4(Rb20DET) and I am using copper plugs too,

they are: NGK R BCPR6EY11 gapped to 1.1

My engines done around 160kms and the 1.1 gap is to big, runs a bit rough at idle. I think they should be gapped to 0.8 when your coils are getting a bit tired like mine. Just change them once a year, only $20.

I previously used NGK platinums, NGK with a heat range of 5, I had them in for about 50,000kms. I dont think they could handle the OPtimax fuel, probably been ok if I had one range colder. The insulation on a couple of plugs developed an orange colour and the car would not start properly sometimes.

I dont think the platinums are worth it either. It only takes an hour to change them anyway and like someone said earlier you get to see how the car is running, can look down plug hole and see if pistons are carboning up at all.

I spoke to NGK. They say for Skylines and 200SX's, the better copper plug to use over the BCPR6ES is the BKR6E(Y)s... I have a set of BKR7Es in my car and I can run wider gaps with them compared to my 10k old platinums....

i have noticed the difference between power of the spark of coppers to platinums, my car and a mates car were misfiring a lil on full boost, we both regapped our new plugs (mine copper his platinum) to 0.8 both cars ran great, but after a few months his developed a miss again? coppers are sweet

Originally posted by Steve

and you should never regap platinums from what I have heard, it is such a thing coat of platinum that 9 chances out of 10 you will stuff them.

that might explain why his car started to misfire again. as much as i'd love to pretty much never replace my spark plugs if i used platinums, but it think it just aint worth it, also does anyone know if platinums and iridiums work well in the r33/32s with australias 98 octane limited fuel as opposed to the 102 in japan?

well it has been done

i changed the plugs to BCPR6ES plugs and they run great. it took me about 2 hours to do (i didn't remove the intake pipe over the top of the rocker covers, i just loostened it. it made life a real bitch though for cylinders 3 and 4!)

BUT... it hasn't removed the miss that i have at idle.... grrrrrr...

i'm about to get some stuff to clean the afm and then give the ECU a reset so we'll see...

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