So a lot of us are using the Iridium Denso, NGK, Bosch. Then you have the Platinum and a lot of Ford guys are swearing by the Copper Core Autolites? Anyone using copper cores? I know, shoulda done a search. I'm learning. So, I put in Autolite Iridiums, drop in K&N, set the tires to 35psi. Been using Shell gas lately-$3.79!Had to pick up my in-laws from the airport.100 miles r/t. Fueled up before I left. So 4adults, 1 4yr old and 3 big suitcases on the way back. I kept my speed at 60-62mph and the whole trip cost me 1/8 of a tank. Maybe this is normal to you, but before said modifications and dropping my speed from 75 to 60-I would have been just above 1/2 tank! Hope this helps someone

 

I don't think there is a "best" plug, all things considered. Each person has there own philosophy, kinda like motor oil.

Personally, I drop in regular Denso's every 30k in all my metric cars and I have never been let down. They are cheap and I feel all fuzzy getting new plugs every now and then.

Platinums are OK because you can find them pretty cheap now.

Iridiums are out of the question for me personally because I cannot reconcile enough difference to justify the cost.

But that's just me. Your mileage may vary!

Jim

 

I use the NGK Iridiums, mostly because I had never changed a spark plug before and I wanted something to do on a Saturday morning. I can't tell the difference over the Denso's that came with it. The Denso's has almost 30k miles on it.

 

I run NGK copper exclusively. Since I put in new ones yearly, I have no need for iridium or platnium as they are for longevity only and do not increase horsepower or MPG regardless of what sooo many others want to believe.

 

This may be so, but I have been told numerous times that Bosch are horrible in our motors.

 

i just ordered these yesterday

http://www.newscionparts.com/product/?id=1779

i should have them next week and installed next saturday

 

yeah, I've heard Bosch is horrible over all

 

i like my toyota plugs. make sure their gapped correctly or the car will run funny

 

I use NGK V Power plugs, and get this...gapped at .029, I got 535 miles out of a tank of gas using them. I'm still running the same set of plugs and just got 485 miles out of my latest tank...in 11 days my 06.5 xb will be 2 years old with approx 45,000 miles on it, those numbers dont lie.

 

Freeway miles on a manual correct? 485 is great. I can only get 230ish on a tank in the city

 

NGK or Denso for Japanese rides!

Use the Bosch for German and the Autolites and Champions for Domestics.

 

Rockauto.com has Autolite XP Iridiums for $4.31 plus theres a $1.50 rebate through Autolite. I'm seeing different gap settings on the post what should the gap be? I saw one at .29, .32 and .44?

 

iridium. I won't claim they do anything to increase power or gas mileage. But my xB does run smoother and reduced the hesitation it had when cold after I put in Denso iridium power plugs. I didn't believe it either until I tried them. Use what the plug manufacturer specifies for gap.

 

Gap might be Mfr. dependent.

.044 is the recommended gap for NGK Iridiums. Mine seem to run well, like stew32 stated you won't gain any HP but the box runs smoother and cleaner...more responsive.

Go to the Autolite site and dig around. There must be a chart somewhere that shows the correct gap for Autolites in an xB.

edited to correct spark plug gap spec! .44 or 7/16" is a no go!

 

yeah, didn't know if there is a factory, i.e. Toyota setting for this what they come gapped at basically, but I guess it is a spark plug manufacturer thing

 

Get the irridiums -11 pregapped at 0.044" and watch the decimal point there guys . . . a 0.44 gap is almost half an inch! The best price I found was on Amazon with free shipping so factor that in when you shop.

 

Here's my angle from what I've read and the results I've gotten...(535 miles out of 1 tank of gas, auto transmission):

I've read from a source that I trust that NGK's (the cheap ones) have the lowest resistance, which is what you look for in a spark plug...the same source recommended that the gap should be set to .029 to take advantage of the low resistance of the plug.

I'm not saying that using the NGK V Power plugs gapped at .029 will get you 46 MPG, I also used fuel additives and enhanced motor oil lubricants along with removing the "snorkle", but now I'm a big fan of the NGK V Power plug.

 

As far as modern day vehicles, you shouldn't see any significant power gains.

 

I'm sooooo tired of all these sparkplug threads. Does anyone ever do a search???? It's useless trying to recomend what plug is best because so many people have learned so much BS and recommend such bad things.
Right now, The Best Plug for seeing the most improvements in the way your xB will run and perform is the NGK Irridiums that come pre gapped at .044. They can be had on Ebay for around 30 bucks shipped. I was doubtfull till I tried them but they actually freakin worked. They corrected my rough idle and sluggish throttle response and the added 2-3 mpgs are welcomed too. From now on they are the only plugs my bB tribute will ever see.

 

hmmm I am bored maybe I'll start another spark plug thread