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I run OkadaPlasmaDirect coils on my Audi A4. one of the best mods I did. gained a noticeable amount of power in the mid range at all throttle angles. probably because of the multispark firing.
not sure if it would be viable for the M156 as we do not have spark efficiency issues as does on an Audi 1.8t.
Interesting, I didn't know there was the Okada option out there for our motors.
I suppose a cheaper way to achieve a similar result would be to use copper plugs and gap them as wide as makes sense, but it'll take lots of trial and error on this motor (which will be a pain with it's 8 plugs) and then again, nobody makes copper plugs with such a long reach for our motors anyway...
I run copper plugs in my M5 and Celica and much prefer the feeling, albeit at the inconvenience of changing them out yearly. I run something like a 1.2mm gap on the Celica and it's fine to 9000rpm, even with nitrous. Notably smoother and juicier-feeling on the pedal, compared to iridium. Same story with the M5, but not revving so high of course.
I'd like to see a similar arrangement on the M156 motor with these more powerful coils...but I don't fancy being the guinea pig
Go on skratch77...you've got this mayn.... show us that the coils will work for us
side gapped copper, then yes. any platinum or iridium tipped plug will produce better performance due to the smaller tip and electrode. in the case of side gapped spark plugs copper will do fine, and since they're side gapped you do not have the issue of the tip and electrode sitting in the way of the air/fuel mixture (for the most part).
side gapped plugs are generally reserved for engines of which do not have to worry about emissions testing as low rpm/speed emissions will be horrid.
I should have been clearer, I just assumed that everybody side-gapped plugs as that's how I was taught to gap them.
I know that the smaller tip on iridium means less voltage required to send the current through, but I always understood it as if the electrical system (in this case the ignition coils) were able to deliver the power (and more often than not, they can), a copper plug would lap it up better because it can conduct better and create the biggest spark, albeit at the tradeoff of an earlier death or frequent re-gapping. That being said, I think that's only really because iridiums can't be gapped easily without damaging the tip. I guess what I'm trying to get at is, it would be nice to run the biggest gap possible without blowing out the spark and having a misfire. Like I said, I run this spark/gap ethos in two of my cars and they run like a dream
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
I also thought that all other things being equal, that copper was the best choice for performance in plugs. I thought iridium was only used for ease of maintenance purposes - it’s more durable and therefore would wear better and require regapping/replacing less often, but is a worse conductor.
So this thread sparked my curiosity and I set about trying to find a copper plug for our motors.
Low and behold....the part number is: LZKAR7B
I purchased just one to validate fitment and to try in my car. I've fitted and idled with it...so far so good. I'll give it a drive later in the evening - not that I'm expecting to feel much from just one plug changed, but more than anything i'll be keeping my wits about me to feel for a misfire (which I'm only writing to sound 'correct' for the sake of this thread...lol deep down, i know it'll be just fine).
Assuming it goes well, i'll order 7 more to try next week and report back my butt-dyno findings. If I feel even the slightest improvement, it'll probably be the $30 equivalent of having those expensive plasma coils. Lets see....
oh and for those wondering, it's gapped as 1.1mm from factory and yes the reach is a whisker shorter than oem at the ground strap. 'tis a good thing to me tbh.
Good deal Celica, though I think you'll need to do all eight to feel anything. That said, it's clear that the gap is larger in the iridium plug which directly translates to a larger spark. And a larger spark is a very, very good thing.
Good deal Celica, though I think you'll need to do all eight to feel anything. That said, it's clear that the gap is larger in the iridium plug which directly translates to a larger spark. And a larger spark is a very, very good thing.
Indeed sir, a very good deal. TBH I only wanted to feel for something 'unusual'...which I didn't. Car felt great last night (but that could just be the new velocity stacks that I'd fitted on the TBs) and smooth enough to make me order the remaining 7. I'll report back during the week.
Yeah, they look like they have their perks, but in my head, they look like a much much colder plug too. I know it's the ceramic insulation that usually governs the heat range, but for example, comparing a grade 6 to a grade 8, the tip of the 8 will be notably more recessed into the plug threads. Just something that I'd noticed...
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Originally Posted by Celicasaur
Indeed sir, a very good deal. TBH I only wanted to feel for something 'unusual'...which I didn't. Car felt great last night (but that could just be the new velocity stacks that I'd fitted on the TBs) and smooth enough to make me order the remaining 7. I'll report back during the week.
Yeah, they look like they have their perks, but in my head, they look like a much much colder plug too. I know it's the ceramic insulation that usually governs the heat range, but for example, comparing a grade 6 to a grade 8, the tip of the 8 will be notably more recessed into the plug threads. Just something that I'd noticed...
A little OT, but how did you make or where did you get velocity stacks for the 82mm TBs? That’s whats holding me up from doing the install.
And the Weistec Brisk plugs look just like those BTW. Don’t think they’re copper but silver. Either way the center electrode is bigger than iridium.
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