Over the last few days I have been reading into the different spark plugs recommended and it seems everyone has a different opinion on what is right. Recently, my car has developed a misfire. Still trying to figure it out, so spark plugs are on the list. I pulled a few out, it is running NGK PFR6B-11 plugs, and they look pretty well worn, so I'm hoping this might be the problem (but its never that simple). Now, during my reading, it seems to make a difference based on mods, so, I have a Twin turbo zed, upgraded injectors, bigger turbos, aftermarket ECU etc... I'm running 17psi. What plugs should I choose?
lol I know you can pick up a full set of coppers, for the price of one platinum, but i meant apart from that. I remember reading that iridium and platinums are no good, but don't think there was any solid proof... is there any truth behind that?
Nah, they're good. I'm a tightarse though. I would prefer another $100 in my pocket than the small benefit I would have got. Difficult to regap non-coppers due to sensitive electrode, but can be done apparently. Also heard of issues with flooding them, but I have never had issues with that so can't really comment.
Hmm ok I might buy a set of the cheapies tomorrow just to trial. I'd hate to sink close to $150 on plugs, to realise that its not my problem So, reckon BKR7E are the go? Higher temp rating for more boost and all that crap haha
Those NGK PFR6B-11 are maybe a bit too gappy for that car. I would try the standard PFR6B (which i think are .8 or .9).
Colder temp rating if the number is bigger. The car wasn't pinging on the dyno running a heat range 6 plug, I can't see any reason to go colder
lol thats what i meant... colder. Its been a long day. I read somewhere, that when running over 15 psi you should use 7's. Can't remember who said it, but it was someone on Aus300
good spark and can be gapped, however eve though they are cheaper you will need to replace them more often (17000 Km), depending on how you drive... platinum and iridium last much longer, the platinum ones where designed for the 300 and just for the longer lasting reason. It has been mentioned that iridium are actually made for cars that rev much higher and so the plugs self clean better in them. (the Zed is a lower revving engine so not as efficient cleaning). However I don't think that has been proved and like other say it's up to you.
Iridium is more of a way to increase the spark quality, requiring the same coil energy. However, cause they have a smaller tip they 'glow' faster as well making them more of a hot spot in the combustion chamber. Than of course you can use a higher heat range iridium plug but if it starts fouling during normal driving you'll have to replace it. The only times I see an engine making more power on an iridium plug is when the ignition system isn't good enough to overcome cylinder pressure or no higher quality ignition coils or transistors are available. Many 50-100cc 2 stroke tuners use iridium plugs for that reason.
I fit NGK Iridium plugs of the stock heat range to every engine I have and I never take them out again. Ive only ever had one of them fail. They dont erode/wear like ordinary spark plugs and they cope with a far wider range of running conditions hence no need to choose funky non standard heat ranges. Works for me. E
I didn't own the car when the ECU was being set up. I don't want to really determine the correct plugs, i just wanted to replace my old ones as part of trouble shooting for my misfiring. I settled for standard BKR6E's. I chose these because they are cheap, and they should be able to rule out if the plugs are the problem.
I got rid of my Iridiums. Copper easier to gap. Cheap and I know people who run faster than anyone hear who run coppers so good enough for me.
Nothing wrong with the cheap copper plugs I've run platinum & iridium now running BKR7-E cheaper copper plug, 317RWKW 11.89et 120mph 18psi. Eddie
Copper plugs are more forgiving if something is not quite correct, they can be cleaned if fouled and are cheap. its not that they are better its that in most cases we are either running old worn engines or pushing high performance or sometimes both. in these cases the forgiving nature of copper cores is sometimes the difference between a misfire and a purr..
And just for the controversy, I am still running a set of Pulstar plugs(purchased and fitted over 6 years ago). These have NEVER misfired, coughed, spluttered or failed to start(and are coping with 18psi under all conditions). Not bad for a set of Mexican plugs that I was assured would fail sooner, rather than later. Just saying.:rofl::br:
