Spark Plug

[kennly]

Since the Celica 2000 is a 4 stroke engine and is running an otto cycle in the car engine, if i change a better spark plug e.g NGK E-idrium, will the performance gain much from it?

[GTS LAID]

some people saw an amazing improvement (something like 5-7%) on the honda forums for the accord... for the celica though, as a better tuned engine that already has a base iridium plug i'd say the increases wouldnt be that high.. maybe bordering the 1-2% mark.. .then again this is all speculation based on past cars experiences with other mods.

[kennly]

OK, thanks for ur information.

[gts24]

Ok, I'm bringing this thread back to life. I'm going to hit 50k shortly and I think it would be a decent thing to go a head and replace my spark plugs.


I've done numerous searches on this site and come up with the following base information.

(keeping in mind I have a GT-S/2ZZ-GE)

1. There is a longer life plug, which comes stock 100k miles.
2. There is a shorter life (possibly higher performance plug) that only lasts 30k miles.

I realize there won't be much if any performance gain from going wtih some radically different plugs. I am not looking for that here I just want some logical technical discussion about getting a little bit more out of our plugs.


http://www.newcelica.org/forums/showthread.php?s=&threadid=13669&highlight=spark+and+plug


http://www.newcelica.org/forums/showthread.php?s=&threadid=13361&highlight=spark+and+plug --shows a dyno of an accord with some pretty decent gains. But zjoker9 chimes in and says he was misfiring because of different plugs.


This seems to be the common quote that pops up

"Q. How long will Iridium Last?
A. Iridium use represents the most significant technological advance in automotive spark plug manufacturing, since platinum was introduced in the early eighties. As vehicle manufacturers produce increasingly complex and efficient automobiles, there is a greater need for long-life plugs that can tolerate leaner fuel mixtures and improved combustion processes. DENSO has responded to this need by developing its Iridium alloy, originally for OE applications. For example, many newer Lexus

[GTS LAID]

interesting info... the question is i guess... why would the car get better power if its getting complete ignition anyway!!

[gts24]

Yeah I hear ya on that. I just wanna get some new plugs and my basic question is , where can I get the higher performance lower life plugs, I can go to densoiridium.com and get the regular plugs for the 2ZZ-GE, however I cannot get the high perf/lower life ones.


It only gives you one plug option...

[SilverRide]

Doesn`the manual state the new plugs are part of the 30k service schedual? This would seem to indicate that "High performance" plugs are stock

[Griffin]

Well.... not necessarily true... the factory plugs are engineered for long life not 100% maximum performance. Theoretically if they made a plug that had a bigger healthier spark it would probably achieve a higher level of combustion (and logically erode faster and hence require replacement more often). BUT this being said I doubt the gain would be noticable except maybe as a slight difference on a dyno run. To obtain ULEV Status and this kind of power per liter the GTS is doing a pretty darn good job burning the air fuel mix I would think.

Griffin

[gts24]

thanks for the reply griffin. I'm gonna end up getting something... I'm sure ;)