My study on SPARKPLUGS (VERY LONG)...Chipped guys should read this!
02-26-2003, 12:50 PM
#11
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those of you hungry for more info:
http://www.automotivearticles.com/get.php?action=getarticle&articleid=18
and<ul><li><a href="http://www.centuryperformance.com/spark.asp">http://www.centuryperformance.com/spark.asp</a</li></ul>
and<ul><li><a href="http://www.centuryperformance.com/spark.asp">http://www.centuryperformance.com/spark.asp</a</li></ul>
02-26-2003, 01:25 PM
#13
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I know some guys with a dyno who tested a half dozen different plugs..
who came up with the same conclusion that you did from a HP standpoint. The NKG coppers out performed all the other plugs with the next closest plug running 6hp less on turbo'd Honda.
02-26-2003, 02:02 PM
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kind of a tough question to answer, It depends mostly on what most important to you...
How important to you is it to have a few extra hp at the track? are you willing to take the time to do the plug swaps?
02-26-2003, 02:17 PM
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I used to change oil + sparkplugs every 2500miles...
...this is, of course, on a 480HP twin turbo Supra that's a lot more "fragile" then our cars. Many people change their Synthetic oil and plugs at 5000 miles (manual recommended every 2500miles), but I've seen plugs foul on the Supra at 2000miles (keeping in mind that we ran w/ NO cats, and very rich A/F). The car lasted me 122k miles w/ that much HP, until I blew the motor doing a top-end run at 22psi boost on Pump gas 
Personally, I'm very **** about maintanence, especially in a car running high boost. But I'm sure you guys can probable get away w/ changing the plugs at 5000miles.
And YES, I run coppers 24/7, and not just at the track. Your platinums will run HOT and preignite, causing the computer to retard timing = Car will run like ****.
-Jeff
Personally, I'm very **** about maintanence, especially in a car running high boost. But I'm sure you guys can probable get away w/ changing the plugs at 5000miles.
And YES, I run coppers 24/7, and not just at the track. Your platinums will run HOT and preignite, causing the computer to retard timing = Car will run like ****.
-Jeff
02-26-2003, 02:20 PM
#17
well no cat doesn't make any diff plugs.. lol but yeah i can understand plugs going bad if the car
is running super rich... but then i have to ask, why ARE they running so rich to begin with?
Factory they change the plugs every 20k i believe.
I will be changing mine out later today(24000).
=)
Factory they change the plugs every 20k i believe.
I will be changing mine out later today(24000).
=)
02-26-2003, 02:34 PM
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Re: what did you gap these plugs at?
Every car has their own specs, where gap will vary. My plugs are currently gapped to 0.034", and it's boosting "1.5" (according to Neuspeed) without any misses. I will still try to increase the gap gradually.
The rule of thumb is the have a gap "AS BIG AS POSSIBLE" without any breakups or misses. I would hesitate to tell someone to lower their gap unless their car begins to missfire. Though, however, I have found that using smaller gaps increase throttle response, but yields top-end power (which we need).
-Jeff
The rule of thumb is the have a gap "AS BIG AS POSSIBLE" without any breakups or misses. I would hesitate to tell someone to lower their gap unless their car begins to missfire. Though, however, I have found that using smaller gaps increase throttle response, but yields top-end power (which we need).
-Jeff
02-26-2003, 02:44 PM
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Re: interesting.....
Phil,
Gotcha!
But my main concern is the actual center electrode on the IK plugs, and not the material (whether it's coated coppers or not), but the design of the electrode. I am real hesitant about using "fine-wire" electrodes, even when the heat range is colder. The electrode simple cannot withstand the combustion temps, and they begin to "heat-glow" and preignite anyways (despite the colder heat range). I've had this experience w/ the IK22's I used in my previous car (2 steps colder), after many attemps and testing,...i just said "**** it" and decided to stick w/ coppers. BUt of course, I was only running 22psi+ of boost (420+ rwhp).
If those damn Iridiums were so god damn expensive, I would perhaps do more testng.
-Jeff
Gotcha!
But my main concern is the actual center electrode on the IK plugs, and not the material (whether it's coated coppers or not), but the design of the electrode. I am real hesitant about using "fine-wire" electrodes, even when the heat range is colder. The electrode simple cannot withstand the combustion temps, and they begin to "heat-glow" and preignite anyways (despite the colder heat range). I've had this experience w/ the IK22's I used in my previous car (2 steps colder), after many attemps and testing,...i just said "**** it" and decided to stick w/ coppers. BUt of course, I was only running 22psi+ of boost (420+ rwhp).
If those damn Iridiums were so god damn expensive, I would perhaps do more testng.
-Jeff