Spark blowing out and killing plugs?

[Rboosted717]

Anyone else been having this problem?
We noticed awhile back when I went in the shop to dyno after driving around for a few months that my car was miss firing up top. What seemed to be happening was that from 7000rpms on, the spark would blow out causing the power to jump around. After a few runs making sure that it will keep doing it we decided to pull the plugs. They were totaly fried and black. So we popped in some new plugs and dyno'd. Immeditaly my power was back to normal and the problem was gone.
Here's a mini plot to show you before (bad plugs with the problem) and after (with new plugs):


However today (1.5months later) I pulled plugs again and saw that they were all black around the edges of the plug and red/orange on the tips and spark area. I also think that the car is starting to miss fire again. Here's a picture of what the plugs looked like when I pulled them today. (note they are only 1.5 months old, with very few miles on them, and they are the NGK BKR7E-11 plugs which I always use. Also they seem to look like they are in the same condition as my plugs were awhile back which were a lot older!)

Do you guys think its time for a ignition system now to help increase the spark? If so should I get the 6AL ignition since a BTM isn't needed with my setup and stand alone.

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Mike Marsey
'98 ITR #0717
Supercharged w/260whp & 170trq
Member of the 12sec club!
12.9@108mph w/2750lbs (full street setup)
For all your JRSC type R questions, go to: http://www.geocities.com/superchargedtyper/
For for the best dynotuning check out: http://www.dynospotracing.com

[This message has been edited by Rboosted717 (edited February 12, 2002).]

[BadAss]

You sure you're not just running too rich on the top end? You said that the spark area looked red/orange (good plugs are usually more "tan" from what I've seen), but from your pics they look pretty black to me. (although the pictures were a little small to see them really well).

I'm definitely no expert on the subject, but those new plugs look way too black for only 1.5 months . . .

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Santa Barbara, CA
2001 4-dr GSR, 6psi JRSC, Comptech Icebox CAI, DC 4-2-1, Greddy exhaust, B&M FP Gague, JR BTC & MAP Controller, Cartech 2020

[A-dub5513]

Anyone who could shed some light on this would be great because I've replaced my stock plugs for BKR7E-11's at around 28,000 miles and I'm already on my second set at 31,500.

They're not entirely black with soot but really brown and rusty lookin' especially at the tip.

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'99 GSR, JRSC 6 psi., JR HO fuel pump, JR BTC, Cartech FMU, B&M Fuel Riser, RPS Turbo Clutch, 11 lb. lightened GSR flywheel, DC ceramic 4-2-1, Greddy cat-back, DC tower braces front and rear, Skunkworks 22mm rear swaybar, Koni 2-way adjustables, RS*R race springs, (and Octane Booster @ $11 a bottle...aaargh!)

[BadAss]

One question that I've never got a satisfactory answer to is re: the preferred gap for the colder plugs in a GSR (which is gapped differently than other 'Tegs). Maybe this has something to do with your problem?

I just put in some BKR7EVX-11's (installed with the .044" factory gap) to replace my stock plugs about 3K miles ago without issues. Maybe I'll pull them this weekend to see how they look. Do you GSR guys out there keep the .044" (1.1 mm) gap?

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Santa Barbara, CA
2001 4-dr GSR, 6psi JRSC, Comptech Icebox CAI, DC 4-2-1, Greddy exhaust, B&M FP Gague, JR BTC & MAP Controller, Cartech 2020

[Holden]

I've been going 5-8K miles between plug changes and haven't had any problems.

Same plugs. NGK BKR7E11 (or whatever...)

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Greg Holden
96 GSR, JSRC @10psi, All the Goodies!
Best 1/4 ==> 13.356 @ 105.92mph (non-drag street tires!)
My JRSC Install Site

[Rboosted717]

My air/fuel mixture is at 13.0-13.2 up top and solid. I think the problem is the car is way too rich at partial throttle and crusing around town. Also why is my car missfiring then?

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Mike Marsey
'98 ITR #0717
Supercharged w/260whp & 170trq
Member of the 12sec club!
12.9@108mph w/2750lbs (full street setup)
For all your JRSC type R questions, go to: http://www.geocities.com/superchargedtyper/
For for the best dynotuning check out: http://www.dynospotracing.com

[TrustGs-R]

how's your gap, sir?

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daily driven 96 turbo gsr hitting 11s. 315WHP 225WTQ on 91 octane pump gas and 15.5 PSI.

JRSC is garbage. I speak from experience.

[marouj_moron]

Rich, way too rich.

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[TrustGs-R]

13-13.2 up top in boost is NOT too rich.

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daily driven 96 turbo gsr hitting 11s. 315WHP 225WTQ on 91 octane pump gas and 15.5 PSI.

JRSC is garbage. I speak from experience.

[217gsr]

I actually gapped by BKR7E-11's too large (.045 mm). Oops. The result was surging and inconsistent power. It feels like your boost is bleeding through a big hole! Plugs had a white-ish blistering on the ground strap. My plugs are normally pretty black.

I re-gapped my plugs properly. . .and the problem went away.

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6 psi JRSC GSR: 3" intake -> 217 hp/155 ft-lbs.
New: Endyn stepper, GSS342