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To be clear. I'm not giving review on TT's. I've not been installing long enough to make a call on them. It just to early for that!

What I like about TT's is:
I can spot bootlegs due 0.4mm Iridium Center Electrode. At ~1.5 X the thickness of a human hair, china mfg counterfitters have yet to copy!
Denso claims:
"Achieve higher ignitability and require lower spark voltage than ever before"
This means less voltage draw from coils. Which suggest cooler operations of coils. Heat is the enemy of coils. This has at least in part, too due with the narrower gap (1.0mm) that TT start with. Which Denso claims delivers a great flame kernel.

I've heard from one source (not what I call reliable source) the NGK are not walking-out. If the NGK IFR6A11 (toy rec for 2UZ) are not walking out. Than they would be a top choice for sure. But I've rarely seen NGKs. So I can say anything about them. I'm assuming the Denso TT's are walking-out, just like the Denso SK20R11 are.

Interesting I did once see these NGK BK6REIX-11 a .6mm center i a 01LX w/280K. NGK states: "IX Iridium Series plugs were designed specifically for the performance enthusiast".

The 01LX I found them in. The PO stated his 01LX had no pep. I found all 8 plugs only hand tight. History showed. they were only in for 10K miles. But the crush washers had never been crushed. So in this case, I felt the tech forget to torque. I' cleaned them in my plug cleaner and found gap still good at 1.1mm spec. Torque them back in. Darn if this 01LX didn't seem to have more pep, than my very well tuned 10LC The King with Denso Toyota SK20R11

Spark plugs test & cleaning (2).JPG
 
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I installed Denso TT plugs just prior to a 1200 mile road trip. By just prior I mean morning of departure.
They seem to perform as claimed. I note an increase of between 0.2 and 0.4 MPG. I'm getting 16.8 MPG averaged over 3 tanks on 87 AKI. Cruising speeds between 70 and 80, mostly flat terrain with some rolling hills. I have an '06 with VVTi and 5 Speed trans. Running 275/70R-18 KO2s, speed and MPG corrected for diameter.
Idle is also noticeably smoother.
On the return leg I'll test with higher octane. CT-NY-PA gas was too costly to run better than 87 on the Westward leg.

Thanks to this forum and especially @2001LC for letting me know about these plugs.
 
Bumping an old thread here. I have a 2000 LX470. I believe the SK20R11 Spark Plugs are exactly what I need, however amazon is saying they won't fit. I see people putting them in there 2001-2006, etc, is this just a case of amazon being wrong? Or was there different plugs used in 2000 lx models? Cheers,

2022-01-05 08_43_47-Amazon.com_ Denso (3297) SK20R11 Spark Plugs, Pack of 4 _ Automotive.png
 
SK20R11 is correct for all 4.7L 2UZ.fe, and VVT version. Which the 4.7L 2UZ.fe is the engine in your 2000LX.

I use more of the TT these days. Denso IK20TT. But either Denso is fine.

NGK IFR6A11 is discontinued. NGK recommends IFR6T11 currently.
 
SK20R11 is correct for all 4.7L 2UZ.fe, and VVT version. Which the 4.7L 2UZ.fe is the engine in your 2000LX.

I use more of the TT these days. Denso IK20TT. But either Denso is fine.

NGK IFR6A11 is discontinued. NGK recommends IFR6T11 currently.

I installed the IK20TT in a 2006 (VVTi) and I'm happy with them. There does seem to be a slight increase in fuel economy which today is more important that ever. I also notice with these plugs that if you run a tank of 93 AKI fuel at the start of a road trip, the plugs clean themselves (I assume some carbon is being burned off), and the engine sounds better after about 300 miles at highway speed. Idle also becomes noticeably smoother.

I assume that the VVTi motor with 10:1 compression tends to get a bit loaded up running at low speeds, idling and running 87 AKI. I've had non-turbo BMW's in the past that reacted the same way.
 
@2001LC and others

With the IK20TT plugs.. are you re-gapping to 1.1 mm? Or leaving them as is (@ 1.0mm?)

Any info on the NGK TT ruthenium plugs? Part FR6AHX-S

Thanks
 
@2001LC and others

With the IK20TT plugs.. are you re-gapping to 1.1 mm? Or leaving them as is (@ 1.0mm?)

Any info on the NGK TT ruthenium plugs? Part FR6AHX-S

Thanks
1.0mm with Denso TT
 

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