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Old 12-07-2006, 10:52 AM   #31
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Default I believe what you say, but...

Well, I do believe what you all are saying, but I put these Bosch+4 Platinums in on 10/14/2006, and the car (2500 miles later) is still pounding strong! Really strong.

Maybe the +4s are better some way? I don't know. A friend suggested the new Bosch+4 Iridiums as my next plug, but I thought I'd try those NGKs to see the difference.

All I can say is that these plugs DO seem to make the car run better and stronger, more so than others (including rapidfires). I don't get the best milage, but I am always pounding the car and didn't change the O2 sensor after my engine problem (is is a Bosch too though). So taking other'* advice, I'm getting the AC Delco one from Rock Auto, and putting it in ASAP.

If these plugs only last for 6-12 months, I really don't mind. They have a perceptible change in power output.

-Chip
96 SSE (N/A) (K)
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Old 12-07-2006, 06:57 PM   #32
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The NGK TR55GP'* look amazingly simular to the factory original AC Delco 41921'* at 1/3 the price. I'm thinking since NGK makes a lot of the plugs for AC Delco... I wonder if they're the same.
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Old 12-07-2006, 07:24 PM   #33
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That kind of sounds familiar, yeah. I can't remember where I saw that on here though.
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Old 12-07-2006, 10:51 PM   #34
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Well I just got back from Advance Auto after looking at both the TR55'* and the TR55IX'*. They're both a very good looking plug. Only thing is though, the IX'* cost 3&1/2 TIMES more money. $1.99 for the TR55'* and $6.99 for the TR55IX'*. Does that mean they will last 3&1/2 times longer and give me 3&1/2 times more performance?

BTW, the Autolite XP606'* are special order.
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Old 12-07-2006, 10:54 PM   #35
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There is NO PERFORMANCE TO BE GAINED from plugs unless you are the wrong heatrange, which you're not.

Good 'looking' plugs? Oh, buy the pretty one!
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Old 12-07-2006, 10:58 PM   #36
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Quote:
Originally Posted by willwren

Good 'looking' plugs? Oh, buy the pretty one!
Yeah it'* a shame that after they're put in, you can't see the tips.
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Old 12-07-2006, 11:00 PM   #37
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Macdrive, please go back and read this topic in it'* entirety, note the comments that plugs don't GAIN power, regardless of choice, and try to remember it. It'* been mentioned at least twice in this topic, and it'* a myth we need to dispel.

In addition, you cannot judge a spark plug by how good 'looking' it is. If that were true, we'd by running alot more ricer air filters here that don't flow enough air for us.
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Old 12-07-2006, 11:02 PM   #38
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^ ^ ^
Alright then can you please so gracefully explain to me why the the Irridiums are so much better and cost so much more?
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Old 12-07-2006, 11:11 PM   #39
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Q. What makes Iridium better?
A. Until recently, platinum was considered the best material to use on the top of an electrode because of its durability. However, Iridium is 6 times harder, 8 times stronger, and has a melting point 1200 degrees higher than platinum. Put that into a harsh environment such as an engine piston chamber, and you have a spark plug that can resist wear much better than platinum. Additionally, the DENSO Iridium Power alloy is so durable; it allowed our engineers to produce the world’* smallest center electrode (.4mm) which reduces the voltage requirements, concentrating its sparking power. Also, its smaller size, combined with the tapered U-Groove ground electrode, allows more room for the flame kernel to develop and produce a more efficient combustion.


Retrieved from: http://www.densoiridium.com/faq.php
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Old 12-07-2006, 11:11 PM   #40
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http://www.ngksparkplugs.com/product...idiumintro.asp

http://www.ngksparkplugs.com/product...420&country=US

http://www.jcwhitney.com/webapp/wcs/...atalogId=10101

http://www.densoiridium.com/spconstruction.htm

http://search.yahoo.com/search;_ylt=...=slv1-fp&x=wrt

www.yahoo.com

www.google.com

www.howstuffworks.com

But Irridium (as already stated here) doesn't dissipate heat well enough to work in a high-boost application. This MAY hold true for High-compression applications too. So try the irridiums in your 9.4:1 compression L36, and if you're not happy, try the TR55 V-powers, or do it the other way around.
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