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Old 03-26-2005, 01:52 PM   #1
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What spark plugs?

Mods dont move this.

Just curious if some one could reccomend me what kind of spark plug I should use with my pro charged focus.

Right now im thinking of going one step colder with .040 gap.

Any one got any part #'s or anything.

Thanks.


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Old 03-26-2005, 02:52 PM   #2
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Motorcraft AZFS22c they are one step colder than svt and two steps colder than zetec. They are pretty much the standard for boost and nitrous on our cars. Copper, work well, colder, buck a piece, pretty much disposable. When I'm spraying more than a bottle a week, I change em at least once a week, but at $4.00 a change its not a hassle at all. Most recommend gap at .045 to start but you'll get a million different answers from a million people on that. I run em at .040 as well. Good luck

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Old 03-26-2005, 03:55 PM   #3
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get some denso iridium plugs, they'll last a long time and will make more power than motorcraft plugs
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Old 03-26-2005, 04:05 PM   #4
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no plugs make more power, colder plugs work better with boost an nitrous. Motorcraft is the only manufacturer currently making colder plugs at this time for our cars that I'm aware of. Nearly every focus that is making big boost numbers is running the 22's. A whole set is less than one of the iridiums, and if you're not making crazy boost or spraying on them they can last months or longer. Pick what you want.

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Old 03-26-2005, 06:47 PM   #5
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The most boost I will be doing is 10psi.

Im trying to figure out what this Motorcraft part # is for azfs22cf4 I got that from some where or is that the exact same as the one you gave mr.squatch?

I am probably just going to get the ones you gave Motorcraft AZFS22c. Those should be good. I was looking at iridiums becuase every one talks about them but I dont see much point.
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Old 03-26-2005, 07:19 PM   #6
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i would go with the denso iridum like he said they dont give you more power but they are
colder plugs which will work better with a supercharger and hold up to you running more boost
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Old 03-26-2005, 07:55 PM   #7
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actually, they've been dyno proven on multiple vehicles to make more power than stock plugs. because of their design, you lose less voltage through the body of the plug, leaving more voltage for the spark. the design of the electrode also promotes better flame propogation, creating a more even burn across the cylinder. on a 2001 bullitt mustang, a set of denso iridium spark plugs produces aoubt 8 hp and 8 tq at the wheels more than stock plugs on a completely stock vehicle. back to back dyno runs were made to compare stock plugs to ngk iridiums, to denso iridiums. the ngk's made half the gains that the denso's made.
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Old 03-26-2005, 07:58 PM   #8
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hmm i would like to see some dyno prrof on these iridiums. Also what part # is for the deno plugs?
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Old 03-26-2005, 08:12 PM   #9
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i would like to see the dyno charts for hp gains. what your saying does make sense but i dont think you will get that much horse power with the plugs on the focus i think the main reason for the iridum plugs is to not deonate on boosted applications
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Old 03-26-2005, 09:05 PM   #10
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yeah, you won't see much gains, especially since we're driving 4 cylinder engines instead of tuned v8's. I really wouldn't expect much more than a 2hp gain on our cars (NA, maybe 5-8 on a boosted application), but the real difference is in the driveablilty. I'll see if I can find a link that showed those test results, but the magazine article is at least 2 years old I think, so it'll be a bit of work to find that again. in either case, if you're running FI and don't want to be changing your plugs so often, a set of denso's will last you a very long time, and give you great spark. you might want to look into a set of livewires and the SD coil pack too
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