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Old 07-31-2003, 07:17 PM   #1
Tats
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Default Plug gap...

What gap should i run with NGK BKR7EVX-11's for an RS-T. I'm running 6psi.

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Old 07-31-2003, 08:48 PM   #2
kastle
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IIRC, like 32 or 35...
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Old 07-31-2003, 09:06 PM   #3
rhdude
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which wires?

I'm running a .032"
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Old 07-31-2003, 09:08 PM   #4
lotusTT
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I just bought a set of these for my soon to be RS-T. They come with a .044 gap, that isn't optimal?
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Old 07-31-2003, 11:09 PM   #5
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.44 is way too much.... needs to be down like .35 - .32. Staying that high will cause blow out of the spark.. the car will sputter
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Old 08-01-2003, 10:29 AM   #6
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The plugs for the EJ25 in an RS are very easy to remove/replace unlike the EJ20 in the WRX, what a PITA! That said, I would suggest you try a few different gaps, not going over .040. You want as big of a gap as you can get w/o blowing out the spark. I am running .040 gap in my RS-T (9 psi) and it is fine about 98% of the time. Once in awhile I would get a misfire during high boost so I may have to reduce the gap a little. The high powered TEC-2 coils may be the reason I can run that big of a gap though....you may find that you'll end up somewhere between .035 -.030 like what has been suggested but you'll never know how big you can go unless you try it out. Good luck!
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Old 08-03-2003, 05:54 PM   #7
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Thanks for the info guys!

BTW....stock wires.

Tats.
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Old 08-03-2003, 09:09 PM   #8
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Quote:
Originally posted by kastle
.44 is way too much.... needs to be down like .35 - .32. Staying that high will cause blow out of the spark.. the car will sputter
Did you guys actually get sputtering under boost?

I'm curious because I've experimented with all sorts of gaps and plugs and haven't had any spark problems under boost, either at 9.7:1 or 8.5:1 CR. All this on a stock OEM coil pack and stock wires to boot. I've tried platinum plugs, standard copper plugs, and even non-resistor plugs, and have now stuck with standard copper Denso plugs for economy.

-WaC
Wayne
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Old 08-03-2003, 10:07 PM   #9
kastle
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Quote:
Originally posted by wac


Did you guys actually get sputtering under boost?

I did @ 13psi on NGK's gapped @ .42 w/ the TEC-II.
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Old 08-04-2003, 04:03 PM   #10
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Quote:
Originally posted by kastle
.44 is way too much.... needs to be down like .35 - .32. Staying that high will cause blow out of the spark.. the car will sputter
Kastle, too broad a statement . With stock coils and wires then yes, low-mid 30's work best but for upgraded coils (TEC) or with low resistance wires you must increase the gap or you'll jump it too early and miss off boost. My MSD wires (custom built) require a low-mid 40's gap to run well under most conditions. I will try dropping into the upper 30's this fall when temps start to drop and humidity goes up but in 100 deg heat I'm getting away with the larger gap. Oh, and at 13 psi most of us would go boom... YMMV
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Old 08-04-2003, 05:56 PM   #11
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Good points there Boy...
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Old 08-05-2003, 09:00 AM   #12
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thank you, sir. Trust me, when I built these wires (a couple of months before the turbo) it took us a week to track down why the car was misfiring at ~3k RPMs/WOT... very frustrating.
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