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Old 04-17-2011, 12:40 PM   #19
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Quote:
Originally Posted by big lo View Post
NGK sparks are way better than the Denso spark plugs, nice write up Aux, I changed mine when she had 25000, and again when she hit 50000, soon to be changed again lol
I did'nt choose either brand, I just ordered the dealer parts and a DENSO is what I found in the box.
NGK are all Japan made, DENSO are a mix of Japan/USA parts, see box pic...
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Old 04-17-2011, 12:47 PM   #20
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Originally Posted by marcus View Post
Make sure u guys check the spark plug gap still

by the way I think denso only last 30k miles vs ngk iridium 120k miles
Not true.
DENSO sells two types of iridium plugs;

IK16 is the "regular" Iridium plug you're writing of.

SK16R11 is the "long life" Iridium OEM replacement part they market that the dealer sold me.
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Old 04-17-2011, 02:11 PM   #21
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Denso make a performance and long life iridium plugs.

The difference with the perfomance plug it that it has a grove in the side electrode that is supposed to concentrate the spark and give a slighly better prerformance during rapid acceleration.
This groove is eroded away after about 30k miles and although the plug is still very servicable, the benefits of the groove are no longer present but, they wiil stiil perform like a standard iridium plug. This is why they say to replace them after about 30k.

I used the Denson performance plugs (IK16) in my Celica and they do seem to run slighty better. It's nothing dramatic however as it only a spark plug.
If you are going to change them at about 30-40 k miles anyway, you might as well go for go for the performance plugs.

BTW, I agree that 100k is way to long to change the plugs and most mechanics recomend at least pulling them out at 50k to inspect them and to prevent at them from seizing at the threads
So, if you are giong to pull them anyway you might as will replace them.

Last edited by RedRide; 04-17-2011 at 02:32 PM.
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Old 04-17-2011, 08:35 PM   #22
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Originally Posted by Lil Abner View Post
I'm pretty sure you don't gap Iridium plugs!
^^ x10 - Definitely don't gap iridium or platinum tip plugs
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Old 04-17-2011, 09:30 PM   #23
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I put them in as they came from the box.
I can't imagine dealer techs messing with a gapper with a lot full of cars to be serviced...
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Old 04-17-2011, 09:55 PM   #24
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You can gap an iridium plug. The problem is the genter iridium electrode can be easily broken if your not careful.

From NGK:
"These plugs are made to the most popular gap sizes. In case it is necessary to re-gap these plugs, carefully open the ground electrode using a pair of needle-nose pliers or a wire style gap tool. Do not use a gap wheel type tool that will pry against the center electrode and could possibly break it off."

In other words, just be careful and don't put any pressure on the center electrode.

Last edited by RedRide; 04-17-2011 at 10:05 PM.
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Old 04-17-2011, 10:27 PM   #25
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It is highly recommended not to by most manufacturers. I know you CAN, but it is more likely you'll damage it then set the proper gap. They almost all come with the exact gap your engine needs (vehicle specific applications). I've been told by our NGK rep not to gap them
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Old 04-18-2011, 09:30 AM   #26
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Quote:
Originally Posted by johnny_vitz View Post
It is highly recommended not to by most manufacturers. I know you CAN, but it is more likely you'll damage it then set the proper gap. They almost all come with the exact gap your engine needs (vehicle specific applications). I've been told by our NGK rep not to gap them
Yes, manufactures tell people not to gap them because they know there are many idiots out there who wont heed their advise about the center iridium electrode or may not even be aware of it.

In addition, the ground electrode is not iridium and will erode as quickly as most any other high quality plug. Remember the electrode wear on the performance plug?
Also, it is always prudent to check the gap on any new plug as there is always a possibility that one may not be set to specs.

You can't damage the plug unless you go in there like a bull in a china shop and ignore the warning about the center elrctrode. Remember the electrode is sturdy enought to withstand all the explosions for 100k miles.
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Old 04-18-2011, 03:04 PM   #27
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wow toyota canada seem to switch to denso no more ngk sparks plug on toyota system friend just checked it..
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Old 04-18-2011, 03:09 PM   #28
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Wonder how the difference would be noticed if at all on a boosted motor...
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Old 04-18-2011, 03:53 PM   #29
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looks like plug change at 43,000 miles is coming up....
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Old 04-18-2011, 04:38 PM   #30
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Originally Posted by big lo View Post
NGK sparks are way better than the Denso spark plugs,
Since you broached the subject, why is NGK better than Denso? In fact, I've always wondered why people say one company's plugs are better than another? To me, plugs are like rocks; very simple. They just consist of an electrode, insulator, and a gap.

I use standard resistor Densos in my 1988 Toyota Pickup. The truck has 180k miles on it and it is on its third set of plugs. The first set lasted 100k and the second set lasted 70k. SUre the gap was something like 0.125" but otherthan lower gas mileage, the truck ran fine with 100k mile plugs in it...

I usually run just Densos in my Toyotas because that is what usually comes in them (I believe Denso and Toyota are related somehow).
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Old 04-18-2011, 07:29 PM   #31
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NGK makes a quality plug for a good price. The only thing wrong with denso's most of the time (especially iridiums) is the price. The quality is there, they just want too much for them.

Quote:
Wonder how the difference would be noticed if at all on a boosted motor...
You're better off using copper plugs when boosting
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Old 04-18-2011, 07:56 PM   #32
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Originally Posted by johnny_vitz View Post
NGK makes a quality plug for a good price. The only thing wrong with denso's most of the time (especially iridiums) is the price. The quality is there, they just want too much for them.
I can see how they're cheaper. Is that the only reason they're "better"?

Back in the day, the joke was, "NGK stands for No Good Kind". But, again, I never really saw how one plug could be better than another (for making power). I can see how quality might be different but then one would say, "xxx plugs are made better than yyy plugs."

Don't get me wrong; I am not defending Densos. I usually just walk into the dealership and ask for the right plugs and AFAIK, Toyota dealers always sells Densos.
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Old 04-18-2011, 08:03 PM   #33
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Originally Posted by Yaristeve View Post
Don't get me wrong; I am not defending Densos. I usually just walk into the dealership and ask for the right plugs and AFAIK, Toyota dealers always sells Densos.
I ran OEM denso plugs from the dealer until I boosted. I would recommend NGK for almost any import. I do not believe you make more power switching plugs, the only gain switching from copper plugs to platinum or iridium is the service interval (how long you can leave them in). There is no proof NGK is better than denso, it's just an opinion.
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Old 04-18-2011, 08:25 PM   #34
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Uhm ok? So what's the point of your post????? You changed your plugs and? I'm just trying to wrap my brain around your point?

Fyi denso and ngk make very good iridium plugs. You can't go wrong with either.
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Old 04-18-2011, 08:37 PM   #35
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I stuck with the OEM plugs since I figure the Toyota engineers used Iridium for a good reason besides service intervals...
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Old 04-18-2011, 08:42 PM   #36
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Originally Posted by johnny_vitz View Post
There is no proof NGK is better than denso, it's just an opinion.
They are both good plugs...I answered his post...
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