Iridium spark plugs for S/C 1FZ-FE

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dogfishlake

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Has anyone had experience with iridium plugs on their supercharged 80? I am considering going this route, have read some internet forums where guys prefer them over platinums in boosted applications (everything you read on the internet is absolutely TRUE after all). My local NAPA has a part number for Autolite plugs ASPXP3924, but I don't know if I can get them in a colder heat range. Any help would be great, thanks.
 
Cant comment on iridium vs platinum but I personally wouldn't run autolites. They are for fords and lawn mowers in my opinion. I'd look for a denso match

I paid for some uneeded preventative maint once a long time ago prepping for a cross country drive and part of the tune up was autolite plugs and cheap ass wires. Anyone see joe mello in arcata ca can still smack him for me. Barely made it thru the night to Nevada at 30mph on shoulder of hwy and stumbled into a Nissan dealership. 200 bux and six NGK plugs and wires and all was normal again.

Can't blame autolites for sure it but its all they changed and first comment when tech opened hood.
 
That's enough for me to steer clear, but iv'e owned some pretty cool Fords, all over 40 years old though. I have no doubts about Denso being high quality either. Soooo, anyone got a Denso iridium plug part number?
 
I run Denso MR2 turbo Platinum plugs. One heat range colder than stock and the correct gap out of the chute.

90919-01180-83.
 
Thanks Dan, I did see your post suggesting those before when I searched. I guess if it's good enough for a turbo Toyota, I really don't need iridium.
 
In Toyota's factory forced induction engines they use platinum plugs that are one heat range colder than the naturally aspirated version of the same engine. It seems to be a natural choice.
 
I found this write up from Denso densoiridium.com/faq.php lends some credibility to iridium under boost applications
 
On the other hand Denso is the exclusive service parts supplier for Toyota :meh:
 
thought I'd post up here as I just got my SC installed and running and opted for a different plug other than stock.

I did a lot of reading and basically you want a copper plug. While platinum and iridium plugs last longer they don't cool as well. This comes into play while under boost and they can get too hot and cause issues. You can go with a colder plug to combat that but then run into idling issues.

The basic goal is to find a plug that will run hot enough to maintain a tip temp of 500* so the tip stays clean but not so hot that under boost it detonates. This is where having a copper plug helps with the temps at boost.

I went with a NGK BKR7E. It is 2 heat ranges cooler than stock. Installed with no change to gapping.

It's pretty cold up here right now and I'm running 87 octane. I've only done a few drives so far so the jury is still out but will report back with any info.

Also running this plug will probably mean 30k change outs but they are less than 15.00 a set.
 
Any updates on preferred plug for a forced induction 80? I’ve been running the 1 step colder Denso as Dan recommends, but my idle has gotten pretty rough. I’m due to change them out based on mileage anyhow.
 
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