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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 01-27-2012, 01:45 PM   #1
Nicelyphe
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SR SR20DET - Plugs/Gap/Copper/Iridium!

Been searching around, here, google, other random forums and it seems like people are all over the place with plugs and gaps to be used on the SR.

Some of the things I've read are that the copper perform better, yet need to be changed more often, the opposite with the Iridiums. Some say completely stay away from the platinum plugs as well.

Gap ranges. I am aware that it depends on the level of boost, but throughout my search people give a bunch of diff for the appropriate "stock" setting. Some being .025 all the way to .038

Reason being for this thread is that I'm currently running NGK Iridiums (BKR6EIX) at a gap of .025 but I'm thinking of going with the NGK copper (BKR6E) with a gap of .030. I think my .025 gap may be relating to my little bit of a stumble and bad fuel economy.


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Old 01-27-2012, 03:11 PM   #2
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I use one just a little different, BKR7E.
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Old 01-27-2012, 09:17 PM   #3
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i use NGK BKR7E on all of my modified engines. they are cheap and works really good. i have gone as low as .015 gap on one of my turbo engine that did not have an ignition amplifier. it got rid of the high boost misfire. i also use them on high comp and nitrous injected engines.
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Old 01-27-2012, 09:23 PM   #4
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The NGK R7E's are a really good plug... .28 is a good yapping point.... If your running stock boost the plugs your using should be fine... If your higher than stock boost then try Copper plugs or the R7E's gapped at .28
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Old 01-27-2012, 10:14 PM   #5
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I'm thinking of going back up to .028 on my plugs actually, or all in all just picking up a pair of coppers. I'm just getting terrible fuel economy, and a little bit of a slight miss at idle, nothing to crazy like a full miss, or change in idle, but you can hear it in the exhaust and see it when viewing the motor. Was kind of curious if it was my plugs rather than o2 sensor cause I don't have a way to test that. Considering I'm running a fat o2 sensor on a 63 ecu may be my issue as well eh?
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Old 01-28-2012, 01:56 AM   #6
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Stock is .030-.028. You gap them less if you start missing...like already stated, BCPR7ES. You can get a set of 10 for less than $20.
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Old 01-28-2012, 05:59 AM   #7
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Quote:
Originally Posted by fliprayzin240sx View Post
Stock is .030-.028. You gap them less if you start missing...like already stated, BCPR7ES. You can get a set of 10 for less than $20.

Yea, sitting at .025 right now, going to move my Iridiums up to .028 considering the still should be good and are only a year old.
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Old 01-28-2012, 07:33 PM   #8
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I got a misfire too, i dont think the o2 is causing that since ive had both blacktop and redtop harnesses in my car. Sorry i got no vlue what is it either
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Old 01-28-2012, 08:01 PM   #9
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Yea I have blacktop harness, blacktop o2, and redtop ecu 63, used to run a 62 and never had any issues
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Old 01-28-2012, 08:08 PM   #10
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Pulled out the plugs today, Checked gap 3 were .030 and one was closer to 0.025 so I moved it closer to to the other ones.

All plugs looked the same, which all in all is good haha.

One question though. What would the orange be on the porcelain? Its on all 4


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Old 08-03-2022, 01:21 AM   #11
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I've run both copper core and iridium plugs in my SR20det, given the choice NGK iridium all the way. If i'm in a pinch Copper core NGK always get the job done they just don't last nearly as long as the Iridium core plugs.

S14 sr20det E85 16g turbo 19psi R35 coils
BKR7e I run .029"
BR7eix-11 I will leave them at the factory 1.1mm gap (.04") and they don't suffer from any spark blow out.

While i ran OEM SR20det coils i was gapped WAY down to 0.019" and it still struggled.
While i ran OEM K series coils i was able to get away with 0.025"

here is a helpful article for choosing SR20det spark plugs including the correct hear range, what gap to run and other coil options.

http://www.youtube.com/watch?v=0cdt65IIX3g
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Old 11-20-2022, 11:25 PM   #12
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I?ve run the bk7re?s for about 30k miles on a bolt-on sr at 16lbs. Gapped at 0.28. Never had a need to change the setup. I do replace them every year or if I change something else on the motor, to get a fresh plug reading on the new setup/tune. Or before an event or rally just for fun, they?re $20?
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Old 11-21-2022, 08:13 AM   #13
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Quote:
Originally Posted by Nicelyphe View Post
One question though. What would the orange be on the porcelain? Its on all 4
It's called Corona Stain (seriously) and it's not a problem. It's just caused by static electricity burning up any oil or dirt at the base of the plug wire/coilpack boot.

https://www.youtube.com/watch?v=OvL7oisPn8Q
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Old 11-21-2022, 02:17 PM   #14
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Quote:
Originally Posted by AKADriver View Post
It's called Corona Stain (seriously) and it's not a problem. It's just caused by static electricity burning up any oil or dirt at the base of the plug wire/coilpack boot.

https://www.youtube.com/watch?v=OvL7oisPn8Q
This post is from 2012…
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