I too was wondering about these spark plugs.................

 

Guys, don't screw around experimenting with the ignition components on the 2UZFE, you're going to run into reliability problems. The ECM is looking for specific operating parameters. Stay with the OEM Densos or the NGKs. I happen to run the iridiums in mine and like them, but you can get excellent long-term performance from the OEM Denso K20R-U or IK20 plugs.

 

There are several posts on this matter use the search feature to locate them. You will find that the stock iridium plugs or their equivalent work the best.

 

i think that stuff is all hear-say. having a "stronger" spark isn't going to make the combustion bigger or more powerful

 

I spent quite a bit of time and money on exotic plugs to try and improve dragstrip performance. Not one of them made an iota of difference.

 

I like the cheap Densos that this engine is designed for. Changing them is so easy, why change from what is proven to work?

 

Stick with the OE item; the engine was designed with that, and, in this day and age, as stated before, the electronics probably won't like too many changes.

In my more than fifty years of wrenching on just about anything that has a piston and a sparkplug, I have found that deviating from the manufacturers spec, at best causes no problem, and at worst, messes everything up. If I had a nickel for every different design of sparkplug I have seen devised, and I have tried a few, too, I could probably buy myself a decent cup of coffee. I have seen Splitfire, Tri-Electrode, Fire Injector, QuadFire, and many others that I can't recall the names of; if there was truly any advantage to these ideas, don't you think the engineers would have glommed onto them by now?

 

yeah man i just got some had to order them threw summitracing.com-via tech service over the phone ,my tundra brand new granny driving got 20city-23hwy-mpg,not im not to sure but ill let you know how it goes im installing em tomarrow but ive also (today switched to royal purple oil and filter)just recently added a spectra intake kit(best $120 i ever spent) and i also have about 245,000 abusive miles on my truck!!! ill let you know brother

 

Well?

 

The guy who claims 20mpg City on a 1-Gen 4.7L isn't going to stay for long, granny driving or not. That's just.... well, you know.