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What plug for D585 coil upgrade?

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Old 05-15-2017 | 02:50 PM
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What plug for D585 coil upgrade?
Just received new coils and will be installing D585 coils this afternoon. I'm going to get new plugs, too. I wasn't sure if I should stick with the OEM NGK iridium plugs or if I should use a different plug since I've got higher output coil packs?

Sorry if this question has been answered before. I spent a long time searching and got bogged down in several great "which is better..." coil debates.

Anyway, I'm assuming I stick with OEM. Any suggestions or confirmations?

Thanks!
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Old 05-15-2017 | 02:51 PM
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You should ask whoever you bought the coils from no?
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Old 05-15-2017 | 03:50 PM
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Sure can. I've always considered this site the definitive source of good info, so I started here.

I've sent a request for spark plug info to the vendor.

Still interested in member input.
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Old 05-15-2017 | 03:55 PM
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I'd be curious to hear what your vendor has to say on the matter, please post up what they say.
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Old 05-15-2017 | 04:38 PM
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Most people stick with oem unless they are boosted ...
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Old 05-15-2017 | 07:04 PM
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Originally Posted by Brettus
Most people stick with oem unless they are boosted ...
Thank you. That's helpful.
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Old 05-15-2017 | 07:38 PM
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Originally Posted by Brettus
Most people stick with oem unless they are boosted ...
Are there any real alternatives (Besides RX7 plugs)? I've never heard of any.

Given how quickly we wreck our plugs, this kind of surprises me.

Edit: Amazing what a search can do. https://www.rx8club.com/series-i-maj...thread-253547/
Last edited by Reoze; 05-15-2017 at 07:46 PM.
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Old 05-16-2017 | 12:34 PM
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Originally Posted by Reoze
Edit: Amazing what a search can do. https://www.rx8club.com/series-i-maj...thread-253547/
Yeah, amazing... lots of good info on plugs in that thread. Just not the info I was looking for. Which is why I asked the question.

Sorry if if I sound snarky... for a moment it seemed like you might have been suggesting that I hadn't actually searched for the info I'm looking for. If that's not the case, my apologies.
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Old 05-16-2017 | 12:46 PM
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Not even close, don't worry about it.
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Old 05-16-2017 | 05:47 PM
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There's no shortage of members here who are in the same boat as you, but wouldn't hesitate to throw out their "expert" opinion.

Originally Posted by Jvswan
Sure can. I've always considered this site the definitive source of good info, so I started here.
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Old 05-17-2017 | 11:19 AM
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Here's what I got from the vendor when asked if I should go with stock plugs or something different:

That is a very solid question Sir. The OEM Spark Plugs should work without issue but I do know alot of guys will buy an upgraded Spark Plug. I'm not sure what they are running, but this is a super common conversion so hopefully it would be an easy google search for you. If you cant find anything else on it let me know and I will do some digging.
About what I was expecting. Definitely not Tier One support, but enough for me.

I went with spec NGK Platinum/Iridium plugs.
Last edited by Jvswan; 05-17-2017 at 11:22 AM. Reason: Add more info
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Old 05-17-2017 | 11:21 AM
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Originally Posted by TeamRX8
There's no shortage of members here who are in the same boat as you, but wouldn't hesitate to throw out their "expert" opinion.
Hahaha! Yeah, it takes a while to sift through threads to find the good stuff. Helps to know who usually posts helpful info so one can search threads for specific users.
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Old 05-17-2017 | 04:26 PM
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Originally Posted by Charles R. Hill
Allow me to fill in the blanks for you (and for your chosen "vendor"); the D-585 is specified to use Platinum or better spark plugs in it's OEM application (of which Iridium qualifies) as the current output from the D-585s will kill copper plugs or anything lesser. The tiny Iridium tip relies on the output current to also help keep the tip and electrode clean for far more mileage that typical spark plugs and high-output coils only improve upon that concept. As such, the factory NGK RE7 and RE9 spark plugs will work perfectly.
Thanks for the extra info. That's what I was looking for, initially. While I'm sure it is in a post or two on this site, I hadn't found it yet.
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