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Recommended gap for plugs

 
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Old 07 May 2004, 10:07 am
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Default Recommended gap for plugs

Stock gap is .050" as many know.
I have also heard that gapping at 042-.045" will cure off idle stumble.

How true is this.
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Old 07 May 2004, 10:26 am
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King, I can't speak for the N/A but for my GT even running a moderate increase in boost I had to go to .042 with the gap. For my GT it runs well at that gap setting.
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Old 07 May 2004, 10:55 am
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Gearhead, how is that screamin demon coil doing for you? You mentioned running your gap at .042. Did you try any other gaps after installing the new coil?
I just purchased a screamin demon for my N/A PT and will install as soon as my new plugs come in. Magnecore wires too.

Scott Harris
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Old 07 May 2004, 11:17 am
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Scott, I have a dual stage boost controller. when I run High Boost (15 lbs) I had some issues with the gap@ .050. I would get High RPM studder. Gapped @ .042 no studder and runs great at stock level boost as well. The screamin Demon Coil Pack and magnecore wires are an excellent setup and play together well. I noticed right away that the throttle response was quicker. Running this setup since Jan 2003 without issue. I am extremely pleased with these products.
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Old 07 May 2004, 11:45 am
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Your PT looks great. Mine is a non turbo but has big dreams.
So..... you would recommend, based on your experience with this coil, that gapping slightly under stock will result in less stumble and potentially, better performance, or, at least, a reduced chance of high RPM miss / stumble.
I'm trying to nail down a specific plug gap. .042", .045" or some other amount.
Thanks,
Scott Harris
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Old 07 May 2004, 01:26 pm
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Scott, If I was to have to guess, I'd say a .045 gap would be a decent comprimise. The N/A engine does not have the tendency to Blow Out the spark because of the pressure from a turbocharger like the GT does. If you're going with single platinum or double platinum spark plugs you should be OK at .045. These plugs tend to run hotter than copper plugs, but thats what helps keep the plats clean....
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Old 12 May 2004, 03:35 pm
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what width of aftermarket wires are best?
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Old 12 May 2004, 03:41 pm
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Quote:
quote:Originally posted by milPT

what width of aftermarket wires are best?
I'm no expert but from other threads I recall 8.5MM to be best. The 10mm's are an overkill.
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Old 12 May 2004, 04:01 pm
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True, 8.5mm wires are an excellent choice for the GT.....
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Old 12 May 2004, 04:29 pm
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So I guess for an N/A Pt is gapping should be around .45?
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