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Old 02-23-2006, 05:20 PM   #1
Trunk_Monkey
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Member#: 71032
Join Date: Sep 2004
Chapter/Region: MWSOC
Location: NW Chicago Burbs
Vehicle:
2003 WRX
World Rally Blue

Default Spark Plugs (Split Electrode and Pressure Relief) - Burn Rate/Timing Effects?

Any experience with "different" styles of plugs, especially these:
http://www.splitfire.com/
http://www.e3sparkplugs.com/tech.asp
http://www.beru.com/english/produkte...zen/ultrax.php

I was wondering if an uncommon electrode setup would affect the burn rate/direction. Which would in turn drastically affect the timing, correct?

On a side note, any opinions on these:
http://www.prepsparkplugs.com/
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Old 02-23-2006, 06:56 PM   #2
JRSCCivic98
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Member#: 67080
Join Date: Jul 2004
Default

All those multi or split plugs work on the "Path of least resistance" principal. Do yourself a favor and don't believe the "snake oil" claims they pose.

BTW, I've used both Beru and Splitfires in another FI vehicle and they sucked ass. Det was very hard to keep at bay with these kinds of plugs... even Bosch +4 Platinums had issues. Eventually I went with Denso Iridiums in that vehicle and everything was calm. Densos don't work well in EJ20 motors though. (Misfires)
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Old 02-23-2006, 07:56 PM   #3
Trunk_Monkey
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Member#: 71032
Join Date: Sep 2004
Chapter/Region: MWSOC
Location: NW Chicago Burbs
Vehicle:
2003 WRX
World Rally Blue

Default

Alright, what about the "Pressure Release" plugs, anyone have experience or opinions on those? They seem like a good idea, except for the fact we have the coils on our plugs.
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Old 02-24-2006, 10:17 AM   #4
Steve Nastoff
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Member#: 52052
Join Date: Jan 2004
Chapter/Region: MAIC
Location: South Central Pennsylvania
Vehicle:
03 Subaru WRX
Midnight Black Pearl

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I am in agreement with JRSCCivic98, basing my opinion on past experience with many modified vehicles. I really like NGK Iridium's. Best bang for the buck. I'm sure that someone is going to pipe up about running coppers , and I have run coppers.. The bottem line is that the iridiums stay cleaner on the street. This has not been an issue with my WRX, but my Supra tends to get a little flat after extended street driving without boosting when running coppers. I'm talking several days, not minutes. If I lay into it frequently, all is well. Fact is I've been running HKS Iridiums in the Supra for a couple of years now and I can putt around all that I want and when I let it fly it responds immediately. HKS is pricey, and they are made by NGK to HKS specifications.
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