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Old 03-11-2003, 12:51 AM   #1
FatCatTurbo
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Default Spark Plugs

What kind of spark plus are you guys running on your RS-T's?
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Old 03-11-2003, 01:58 AM   #2
Drac9
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I have stock NGK plugs. I only run 4.3psi though.
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Old 03-11-2003, 02:31 AM   #3
kastle
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lower boost (less then 8psi) it is recommended to use the NGK BKR7EVX-11. That comes straight from Shiv. That is what I was using all the way up to 15psi. I recently have moved to 8 range plugs.
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Old 03-11-2003, 10:07 AM   #4
Eric SS
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swap and N20. gone. : (

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I use NGK 7's also
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Old 03-11-2003, 01:14 PM   #5
jdmimpreza
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NGK 7's
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Old 03-11-2003, 01:38 PM   #6
Impreza25RS
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same here I use the NGK 7s as well
Kyle
98RS-T Owners UNITE!
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Old 03-11-2003, 01:44 PM   #7
boysetsfire
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so would you guys recommend 8's for 12-14 psi?
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Old 03-11-2003, 02:15 PM   #8
Mariano
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Talking

-Best that money can buy for 12psi application?.
-Second Best?.

saludos,


Mariano

Last edited by Mariano; 03-11-2003 at 08:20 PM.
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Old 03-11-2003, 02:54 PM   #9
kastle
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I'd used the 7's in my RS-T at 15psi no problems. When I blew the head gaskets, that's when I replaced the 7's with 8's. I'd still say you could use 7's at 12-14psi no problem
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Old 03-11-2003, 03:53 PM   #10
BOY
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7's, all the way. Kevin, drive down to Summit, they should have em in stock.
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Old 03-11-2003, 04:41 PM   #11
FatCatTurbo
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good info Bill!
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Old 03-11-2003, 08:05 PM   #12
smacksube
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I would highly recommend staying away from the stage 8 ngk plugs....I am 75% sure they were behind my ecu failure. Unbeknownst to me the stage 8's are high resistance (like 5k ohms) while stage 7s are 250 ohms IIRC. After about 15 minutes my car stopped working and my ecu was fried. No mechanic could figure out what was wrong, then I did some research and there was another person who experienced the same problem with the stage 8's on the stock ecu. Just letting you know!
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Old 03-11-2003, 08:16 PM   #13
kastle
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good to know... I run them with the TEC-II...
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Old 03-12-2003, 11:00 AM   #14
Eric SS
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swap and N20. gone. : (

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Quote:
Originally posted by smacksube
I would highly recommend staying away from the stage 8 ngk plugs....I am 75% sure they were behind my ecu failure. Unbeknownst to me the stage 8's are high resistance (like 5k ohms) while stage 7s are 250 ohms IIRC. After about 15 minutes my car stopped working and my ecu was fried. No mechanic could figure out what was wrong, then I did some research and there was another person who experienced the same problem with the stage 8's on the stock ecu. Just letting you know!
?? I don;t understand what you mean by "stage" 7 or 8. The heat range of a plug (as far as I know) only has to do with the length of them and how far away from the center of the combustion chamber they are. In other words, an "8" (for NGK) will not be as long as a "7". the electrode will be farther from the center of the cylinder and will therefor take a hair more time to light the mix which also helps deter detonation.
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Old 03-12-2003, 11:37 AM   #15
BOY
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The heat range is essentially a quantified (albeit arbitrary) scale describing the plugs ability to remove heat from the combustion chamber. All plugs are designed to be a heat sink, the colder heat ranges remove heat 1 "level" better than the last. Therefore a stock "6" plug will remove "x" amount of heat, a "7" will remove "x+a=y" (not sure if its additive, multiplicative, or exponential) and an "8" will remove "x+b=z" such that x<y<z and a<b... there will be a quiz hope you took notes.


http://www.densoiridium.com/heatranges.htm
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Old 03-12-2003, 11:58 AM   #16
Eric SS
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Quote:
Originally posted by BOY

http://www.densoiridium.com/heatranges.htm
Yeah, that's basically what I said above
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Old 03-12-2003, 07:05 PM   #17
kastle
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scratch me running 8's... that plan is out... back on the 7's now
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Old 03-12-2003, 07:26 PM   #18
boysetsfire
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Quote:
Originally posted by kastle
lower boost (less then 8psi) it is recommended to use the NGK BKR7EVX-11. That comes straight from Shiv. That is what I was using all the way up to 15psi. I recently have moved to 8 range plugs.
are you sure that is the right part number for the 7's, i searched on ngk's sight and couldnt find them.
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Old 03-12-2003, 07:50 PM   #19
kastle
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Yup.. that's right off of the plug and right from the TEC-II FAQ & TEC-II Forums.

http://www.vishnutuning.com/ubb/Forum1/HTML/000229.html

Also information on pages 6 & 8 of the tec-faq http://www.vishnutuning.com/files/tecfaq.pdf

Last edited by kastle; 03-12-2003 at 07:56 PM.
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Old 03-13-2003, 02:51 AM   #20
Austin
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The one problem with a BKR7EVX-11 (or any -11 plug) is that it comes gapped at .044. To close the gap down enough for a boosted motor you end up with a funky angle.

BKR7EVX-11 is a platinum plug which is no longer made, although you may still be able to buy units left in stock.

BKR7EIX-11 is it's replacement - it's an iridium plug. Iridium is even harder (longer wearing - better for boosted applications) material than platinum.

An even better plug is the PFR7G. It's a premium platinum plug with a tapered center electrode. The stock plug in the wrx is a PFR6G, so this is one heat range colder.

You can get by with a BKR7EVX-11 (or EIX-11) gapped down to .026 or .028 - that's what I'm using - but it's less ideal.
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Old 03-13-2003, 02:57 AM   #21
Ethan
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AH! This would explain my problem with the stores not being able to order my plugs! Its not made any more huh...
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Old 03-13-2003, 09:59 AM   #22
RS_NW
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Ethan- Call up Action Auto on Everett Mall way... they will have it. I got a call 2 days after I picked up my plugs saying they had another set in stock.
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Old 03-13-2003, 11:56 AM   #23
FatCatTurbo
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i'm confused now, Bill, which one should I get?
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Old 03-13-2003, 12:15 PM   #24
BOY
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BKR7E-11
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Old 03-13-2003, 05:37 PM   #25
boysetsfire
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anyone know where i can get the ngk 7's plugs by tomorrow?
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