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Toyota Master Tech
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i run ngk 2668 iridiums heat range 8. Just logged 13,000 miles one em now they are done. Car runs a msd dis-4 and wires. Those plugs were even in the head when it went through the parst washer lol. Last week i did a boost leak test and forgot to plug the coolant temp sensor back in so i fouled the plugs out on the drive home. turbo is a 7475 precision and runs 29 psi daily on e75
 

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www.dmkperformance.com
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Been running the NGK 4644's now for a couple weeks. Gapped at .020 on E85 at 25lbs, so far so good!
 

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Racing is Life.
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1,150 Posts
I've been running 2668 gapped .018 and so far I've run around 3500 miles on them. Car runs smooth as silk. Cold starts, no problem. Just bumped up the cold coolant temp and it idles like it should. Smooth! I'm going ProEFIsoon and iI'llbs putting new ones in at the dyno to make sure there are no surprises.
 

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What kind of dwell times are you guys using?
 

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Im gapped .028 with LQ9's. Been charging to 3.7ms. Been this way for 4k miles. I switched from E85 to 116 and got 800 miles before my motor starting stuttering under boost. I can roll out 8psi with no issues, get near 20 and its all over. This is on a 4644 plug.

I have some more 4644 to put in that Ill tighten the gap on a little, but did buy this morning some of the 2668 plugs to try out.

Ill also back off on the dwell some.
 

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Yes, brothers own Supras
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1,910 Posts
Im gapped .028 with LQ9's. Been charging to 3.7ms. Been this way for 4k miles. I switched from E85 to 116 and got 800 miles before my motor starting stuttering under boost. I can roll out 8psi with no issues, get near 20 and its all over. This is on a 4644 plug.

I have some more 4644 to put in that Ill tighten the gap on a little, but did buy this morning some of the 2668 plugs to try out.

Ill also back off on the dwell some.
Is the 4644 a resistor plug?
 

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552 Posts
Yes they are. I have switched to the 2668 iridium plug (8 heat range), a better spring from Mojo and remade my coil cover with venting.
 

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I found the 8 heat range NGK copper plugs on Boats.net. They are listed as a Honda part number for around 2.50 each.
 

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Kind of in a grey area, bkr7e, good for 600 wheel 22-25psi, or should I go a step colder?
 

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According to Drift Motion 500+ hp should go with a bkr8e.....I am actually looking at the HKS M40i I think it is. they look good but are really expensive. $26 each
 

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Premium Member
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2,102 Posts
Here I'll make it simple.
You choose copper or iridium 7s up to 800 bkr7e or bkr7eix (2667)
I would use an ridium 8 up to 1000 on gas. If using ethanol these can go up to 1200+ depending on car.
Iridium 9 after.
 

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interesting issue. running IK22's didnt touch gap, car is a single at 13 psi, stock auto on a map ecu.

1st and 2nd are fine hit boost ok. problem is when i leave it in D o/d off and say getting on the highway when i get in to boost it breaks up. i might be hitting 5psi or so when it starts. misfire? but why only in D..2nd i can go all the way to redline wideopen no problem.

ordered new plugs in anycase as these are hitting 3k miles or are over 3k miles.
 
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