Best spark plug

[2001LC]

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

 

[NoTempoLimit]

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.

 

[Ouray19]

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,

 

[2001LC]

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.

 

[NoTempoLimit]

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.

 

[dbleon]

@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]

@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

 

[ProvLC]

Has anyone ran the Iridium NGK BKR6EIX-11 (3764). I orderd NGKiridium from rock auto and this is what they sent.

I noticed it doesn’t match the NGK number listed in the FSM.

Are the ones I listed even worth trying? Frustrated with RockAuto to say the least.

 

[Trapper50cal]

I also installed IK20TT Denso Iridium TT (#4702 on RockAuto)

@ProvLC
Looks like you got the NGK Iridium IX, I'd run 'em. I trusted NGK for all my plugs up until this '99. Many would say "OEM Manufacture ONLY - Denso only" and i DID switch to Denso, but if I had those in hand, I'd run them.

 

[ProvLC]

I also installed IK20TT Denso Iridium TT (#4702 on RockAuto)

@ProvLC
Looks like you got the NGK Iridium IX, I'd run 'em. I trusted NGK for all my plugs up until this '99. Many would say "OEM Manufacture ONLY - Denso only" and i DID switch to Denso, but if I had those in hand, I'd run them.

Thanks for the push b/c I was in a “F”-it kind of mood, bc this was the 2nd wrong order that RA sent to me on these plugs.

I will just have to check them and be mindful of the lifespan on them. From what I gather they more “performance based”. Not sure how true that is but I’ll run and see how they fair.

 

[scubadoober]

The laser has a platinum puck on the end of the ground electrode to help prevent erosion, and give a longer life compared to the IX standard electrode. I am running NGK ruthenium in mine, and they are great. I was an early adopter and have ran them in other vehicles. They hold up way better in cylinder deactivation cars. You have to remember the FSM can only recommend what existed at the time of print.

 

[excessive]

Do not under any circumstances buy spark plugs from Amazon

 

[70 FJ40]

Its time for new spark plugs on my hundy.
@2001LC are you still running the IK20TT and happy with them? Where is the best place to get them to avoid buying knock offs?

 

[Vthelexus]

Its time for new spark plugs on my hundy.
@2001LC are you still running the IK20TT and happy with them? Where is the best place to get them to avoid buying knock offs?

Dealer. They are not that expensive to risk destroying your engine.

 

[2001LC]

Its time for new spark plugs on my hundy.
@2001LC are you still running the IK20TT and happy with them? Where is the best place to get them to avoid buying knock offs?

I do still use Denso IK20TT, purchased only from authorized Denso distributor.
Denso claims: TT's are more efficient. Using less power to produce same or greater spark. Which means, coils (COP) runs cooler. Heat is the enemy of COP.
I've not had any issues, using them.

It was my concerns with knock-offs, that first prompt me to buy & use TT (Twin Tip). China knock-offs, could easily be spotted. Since knock off manufactures, couldn't produce the .04mm Tips. But as time passed, those I bought from Advanced Auto, which owned World PAC. Somehow, in a pack of 4. At least 1, gap would be off. Sometimes I'd find cardboard and others plastic, protector. Then I was sold 4 loose, not in pack of 4. Each, gap was off. Perhaps returns, where knocks slip in. Perhaps China did figure out the TT. Perhaps, one Denso factory uses plastic another uses cardboard, protector. IDK!

I do know:
Since switching to authorized Denso distributor. In over 100 TT, that I've check gap. Every single one, has been spot on. Every single one, has had plastic protector.

 

[ExpertGeek]

Has anyone ran the Iridium NGK BKR6EIX-11 (3764). I orderd NGKiridium from rock auto and this is what they sent.

I noticed it doesn’t match the NGK number listed in the FSM.

Are the ones I listed even worth trying? Frustrated with RockAuto to say the least.

I just ordered these from RockAuto, had other NGKs for my son's Honda to order so added these on a whim @ $6.83ea. Will report back if I find anything objectionable. ChatGPT seemed to think it was a good alternative, comments below:

Yes, NGK 3764 (BKR6EIX-11) is a correct and compatible Iridium IX spark plug for the 2003 Toyota Land Cruiser 4.7L V8, though it is not the original equipment (OE) specification.​

• NGK 3764 (BKR6EIX-11): Features a tapered ground electrode and is designed for improved ignitability, fuel efficiency, and performance. It has a 0.044" (1.1mm) pre-gap, which aligns with the engine's requirements. Many users confirm its fit and performance in Land Cruisers and similar Toyota V8 engines.
• OE-Specified Plug (ILFR6T11): The factory-recommended plug has a non-tapered ground electrode and is optimized for durability (up to 120,000 miles). It offers slightly longer life but may not provide the same performance edge as the IX series.

Both plugs are iridium and share the same heat range (6), so NGK 3764 is a safe and effective upgrade, especially if you prioritize performance and fuel economy over maximum service life.​

 

[scubadoober]

I'll just leave this here.