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Old 06-10-2004, 06:16 PM   #1
munkis
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Default One step colder plugs? What gap?

Ive been reading a bit.

Im going one step colder with my plugs to try and bring my EGTs down, should the gap be less? Should I just leave them at the gap they come? supposdly they are pre-gapped.

going from
BKR6E11 (stock range)
To
BKR7E11 (one range colder)

any suggestions?

Jay
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Old 06-10-2004, 06:21 PM   #2
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colder plugs won't affect your EGT's at all. colder plugs just means the actual plug temp is colder so the heat of the actual sparking element doesn't ignite the fuel and cause pre-detenation.

As far as gap goes, the 7E11's come gapped about .044, I believe the common gap for RS-T's is around .030-.035.
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Old 06-10-2004, 06:30 PM   #3
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IIRC gap is dependant on boost levels too?
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Old 06-10-2004, 07:20 PM   #4
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Quote:
Originally posted by HOK
IIRC gap is dependant on boost levels too?

Somewhat true... most people suggest the lower (.030) for higher boost, the higher (.035) for low boost... I tend to agree with that...
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Old 06-10-2004, 08:02 PM   #5
munkis
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bummer. It really wont help the egts?

I guess I just wasted 10 bux! lol.

I run 10-12 psi. on a 2.2t block, RS everything else.

Im getting my SAFC dyno tuned next week, I just want to get it ready with new plugs, fuel filter and pcv valve...

Should I stick with the 6s?

Jay
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Old 06-10-2004, 08:08 PM   #6
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i found this

1.2 bar Ngk pfr 6b9 .9mm or .035"
1.25 bar Ngk pfr 6b9 .8mm or .032"
1.3 bar Ngk pfr 7b9 .7mm or .028"
1.4 bar Ngk pfr 7b9 .65mm or .026"
1.5 bar Ngk pfr 8b9 .55mm or .022"

but im not anywhere near 1.2 bar so I was thinking the stock gap would be best?

Jay
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Old 06-10-2004, 08:22 PM   #7
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I got a 2.2 turbo running BKR7E-11's @ .028" It works fine.

-Jake
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Old 06-10-2004, 08:25 PM   #8
munkis
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Quote:
Originally posted by Unsung Boxer
I got a 2.2 turbo running BKR7E-11's @ .028" It works fine.

-Jake
how much boost?

Jay
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Old 06-10-2004, 08:30 PM   #9
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You want the biggest gap you can run that won't get blown out. If you make the gap too big, you'll run the chance of misfires from the spark getting blown out. If you make it too small, you'll be making less power than you potentially could be due to a smaller spark. I say start at .030 and see how that works. If you get misfires, make it smaller next time.

BTW you didn't waste the 10 bucks, colder spark plugs will definetly help avoid the very dangerous pre-detination that can kill your engine.
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Old 06-10-2004, 09:15 PM   #10
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Quote:
Originally posted by McDade
how much boost?

Jay
12 PSI

-Jake
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Old 06-11-2004, 01:40 AM   #11
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Quote:
Originally posted by McDade
i found this

1.2 bar Ngk pfr 6b9 .9mm or .035"
1.25 bar Ngk pfr 6b9 .8mm or .032"
1.3 bar Ngk pfr 7b9 .7mm or .028"
1.4 bar Ngk pfr 7b9 .65mm or .026"
1.5 bar Ngk pfr 8b9 .55mm or .022"

but im not anywhere near 1.2 bar so I was thinking the stock gap would be best?

Jay
actually we all start at 1 bar (14psi) N/A. 1 bar is the naturally aspirated barometric pressure. anything higher than that would be considered boost. Boost gauge messures manifold pressure in a sense you're right in saying you dont have 1 bar of extra boost. i have my 2 step colder iridium plugs gapped at 0.28. - IC
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Old 06-11-2004, 03:54 PM   #12
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thanks for the info guys.

Hey Jake one more question for you.

your 2.2t mated to DOHC heads like mine?

what turbo and management are you running, if you wouldnt mind posting it

Jay
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Old 06-11-2004, 07:22 PM   #13
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mine is actually an L:

Pictures here:
http://forums.nasioc.com/forums/show...hreadid=502701

Brief Modlist:
EJ22na block w/ EJ22t internals (8:1)
O-ringed EJ22 SOHC heads.
WRX Turbo
WRX Intercooler
WRX Fuel Pump
EJ22t Injectors
TurboXS BOV
TurboXS Boost Controller
Greddy Emanage
=12PSI
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Old 06-11-2004, 08:01 PM   #14
munkis
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very nice!!, white is one of the hottest colors! That car looks amazing.

Jay
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Old 06-12-2004, 08:42 AM   #15
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ok I just looked and I am already using one range colder plugs..

DOH!

part number i have is bkr7e-11

ahah

im an idiot.

Jay
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Old 06-12-2004, 12:07 PM   #16
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Anybody know of any places online or not that sell NGK 7s grapped to your liking? Ever place around here doesn't and I would rather it get gapped down right than me waste 20 bucks screwing them up.
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Old 06-12-2004, 03:51 PM   #17
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any autoparts store that sells ngks should be able to get them.

NGK 1283

they are around 2.50 each. You will have to gap them yourself, its not that hard.

____________________________

so I changed my plugs today, gapped the new ones at .030 the old ones were at .044, and looked ok.

the new gap really hasnt seemed to change much...

Jay
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Old 06-12-2004, 05:03 PM   #18
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remember that number, 1283... cuz everyone in the world will tell you that they dont exist until they look up that number. The BKR7e-11's dont seem to be a stock plug for any vehicle. Its intended for modified cars.

-Jake
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Old 06-12-2004, 07:48 PM   #19
munkis
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the autopartstore I called, the one that my dealer does business with, actually gave me the number 1283.

thats how I knew I already had them in my car, cause they guy who sold me the car gave me extra plugs.

I went to look at them, and it said 1283 on the box I was like DOH!

Jay
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