: What spark plugs?
03-26-2005, 01:52 PM
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.
03-26-2005, 02:52 PM
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
03-26-2005, 03:55 PM
get some denso iridium plugs, they'll last a long time and will make more power than motorcraft plugs
03-26-2005, 04:05 PM
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.
03-26-2005, 06:47 PM
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.
03-26-2005, 07:19 PM
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
03-26-2005, 07:55 PM
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.
03-26-2005, 07:58 PM
hmm i would like to see some dyno prrof on these iridiums. Also what part # is for the deno plugs?
03-26-2005, 08:12 PM
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
03-26-2005, 09:05 PM
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
03-26-2005, 09:08 PM
I been looking into a screamin demon cil pack. but i was on denos site and I found the # for to replace the stock plugs but cant find anything a step colder.
what is the heat range anyway of a stock plug. is it 16 or am I way off lol
03-27-2005, 01:42 AM
Check out IgnitionSolutions.com
03-27-2005, 11:03 AM
or if you go on central florida motorsports.com if you click on denso plugs it will give you a a hole buch to choose from.
03-27-2005, 09:29 PM
Either use the AZFS22C (I am running them in my 04' SVTF gapped @ .065) Or use the Denso Iridiums which have been proven to increase HP (it has something to do with they take less resistance than a standard plug takes to fire.) CFM has the Denso's and the AZFS plugs, it may be a little while to get the Denso's they have been out of stock for some time (but they may have em' in now,) you can get up to 3 steps colder (go 1 step for every 50 HP increase.)
03-27-2005, 09:47 PM
so 105whp to 200whp. 2 steps colder it is then
03-27-2005, 09:53 PM
im trying to find the part # for the 2 step colder iridium plugs. want to see if my local shop can get them in cheaper.
03-27-2005, 09:59 PM
I have tried to find the part number for the Iridiums but have yet to find them.
03-27-2005, 10:03 PM
dayum. does motorcraft make a 2 step colder plug. I see on CFM they only have the 1 step.
I plan on going to about 200whp so im assuming the 2 step colder is the route to take.
03-28-2005, 01:03 AM
I believe the AZFS-22C will fit you well, the best bet for you is to ask 'Turbo-Tom' which plug is best, he will know best when it comes to a forced inducted Foci. I am currently running the AZFS-22C and am waiting on my SCT tune to be finished so I can hit the nitrous, then I will be able to tell you if they will hold up to the 200+ HP ratings.
03-28-2005, 02:06 AM
We ran them in the 325whp turbo nitrous car, they did great. Tom will try to sell you his "custom built plugs" because he'll say nothing else comes close.
03-28-2005, 03:11 AM
He's a salesman, that's what he does..LOL. You'd do it too.
03-28-2005, 08:13 AM
ya i see the price difference and yikes. I talked to a few guys here who had nothing but problems with the iridium plugs. so Im going to stick with the motorcraft ones.
Trying ot find out what motorcraft part # is for 2 steps colder plug. CFM lists the AZFS22c as only being one step colder.
03-28-2005, 03:11 PM
yep, the 22c's are one step colder than zetec, two steps colder than svt. They work great, this is the first time I've heard the "steps colder per 50hp" thing. They worked great at 150whp, at 225 and at 325 from my firsthand knowledge
03-28-2005, 03:21 PM
alright I guess Im going with the origional idea. The motorcraft 1 step colder.
Thanks mr.squatch. I saw pictures of your build up so if they work for you no problem, then they must be the route to go with my setup.
what gap are you running?
thanks for every ones input.
03-28-2005, 03:42 PM
actually right now i have diff plugs in, haha, but when I go for performance I'll put them back in at 40. I am limping a 12:1 compression car around on 19lb inj right now, so it's being babied. :P
Seriously they're the only plug we recommend, if you just boost under 10psi they'll last a while, the only reason i change em so often is for big nitrous street racing, they get a little worn, but for a buck a piece it's cheap, not to mention you can find em at ANY parts store.