Iridium spark plugs for turbo - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 12 Old 04-09-2007, 12:43 AM Thread Starter
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Iridium spark plugs for turbo

Hey guys,

I've got headaches trying to decide what plugs to use for my setup. I currently have Autolite 3924s gapped at 0.028" in sad shape. I wanted to step down to a 3923 cuz I'm running 13psi with AFR 205 heads. I kinda want to get away from the autolites, havent been working that great for me. I was looking at NGK Iridiums. I know that Denso and AC Delco also make iridiums. What brand and part # do you recommend? I'd like something that crosses from the autolite 3923.


Matt
'95 GTS - (no engine) | TR-6060 | 9" w/Tru-Trac | Griggs T/A | MM Panhard | Koni DAs
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post #2 of 12 Old 04-09-2007, 03:53 PM
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I have read in several places that the iridiums are not a good idea for boosted applications. I can not remember the reasoning behind this. I have used the autolite iridiums for some time now with no problems. For my heads I have a limited selection of plugs.


1979 Mustang coupe, EFI 393, A/A intercooled Eaton m122, 4r70w trans, Megasquirt II, T-top swapped in.

1990 Mustang, 545 BBF, C-4 with brake, ladder bars, tunnel ram with two Predator carbs, solid roller cam, 9", 390/45r15 drag radials.
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post #3 of 12 Old 04-09-2007, 09:32 PM
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I have ran the 3923 for the last couple years with zero problems. That is what HP told me to use. They said to gap at .033 but I put them down to .027

Big Bore Boss 347 FTI 225cc High Port, FTI Cam, Box R Intake under stock hood, T-56 Magnum, 4.30 gears.
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post #4 of 12 Old 04-09-2007, 10:34 PM
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stick to what works 3923's here as well

Dart Blocked SBF, PT106mm, Callies Magnum Crank, Oliver billet rods. New top end package in the works
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post #5 of 12 Old 04-09-2007, 11:38 PM Thread Starter
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okay sounds good and cheap to me. Any opinions on using AC Delco plugs? I just ask cuz I work for a GM dealer and can get them dirt cheap. Plus if I buy them from my work they will come with a 12 month/12,000 mile warranty so if I foul them, replacements are free.

Matt
'95 GTS - (no engine) | TR-6060 | 9" w/Tru-Trac | Griggs T/A | MM Panhard | Koni DAs
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post #6 of 12 Old 04-09-2007, 11:58 PM Thread Starter
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I crossed the #s and found out that the Autolite 3923's are used in the 2006-07 Chevy Cobalt SS. The AC Delco # for the Cobalt SS is 41-106 which is an iridium plug. I think I'm gonna go with those if we have them in stock tomorrow. If not, I'll just get the 3923s.

Matt
'95 GTS - (no engine) | TR-6060 | 9" w/Tru-Trac | Griggs T/A | MM Panhard | Koni DAs
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post #7 of 12 Old 04-10-2007, 12:15 PM
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I run NGK Iridiums. Not sure on the part # though. I have never had any problems with them blowing out or fouling up. I wanted a plug that I knew wouldn't foul out because I have an Incon kit and changing plugs is a PITA.

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11.21 @ 124

480 whp, 520 wtq (10 psi)
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post #8 of 12 Old 04-10-2007, 12:21 PM Thread Starter
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No dice on the delcos. I just headed down to the parts store and they are ordering up a set of the Autolite XP3923 which are the Iridium line. I will have them this afternoon. Thanks for the advice.

Matt
'95 GTS - (no engine) | TR-6060 | 9" w/Tru-Trac | Griggs T/A | MM Panhard | Koni DAs
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post #9 of 12 Old 04-10-2007, 07:38 PM
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Quote:
Originally Posted by Steed93 View Post
I run NGK Iridiums. Not sure on the part # though. I have never had any problems with them blowing out or fouling up. I wanted a plug that I knew wouldn't foul out because I have an Incon kit and changing plugs is a PITA.
Same here,on both counts.

1992 LX coupe-Incon twin turbos
1983 GT Widebody
1988 BroncoII-5.0/AOD transplant

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post #10 of 12 Old 04-15-2007, 10:51 AM Thread Starter
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I used the XP3923s gapped at .028" and driveability got twice as better.


Matt
'95 GTS - (no engine) | TR-6060 | 9" w/Tru-Trac | Griggs T/A | MM Panhard | Koni DAs
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post #11 of 12 Old 04-15-2007, 07:00 PM
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3923's here

89'LX 306,T.W.heads,perf.intake,36's,stock cam/1.7's,70mmT.B.,T-56,3.27's,Twin 60/63 T3's intercooled,14psi,Evolution WG's, Meth inj.
579.2rwhp 658.6rwtq,[email protected] kicked off track
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post #12 of 12 Old 04-15-2007, 07:18 PM
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I run the iridiums as well and like them a lot for TT.

for pricing, always check out www.rockauto.com . i was able to get plugs reasonably priced. also, www.sparkplugs.com is quit good. and if you have a business you can get set up as a business account (call them) and you get an additional 20% or so off of the listed prices. Make sure you click bottom-right on the 'advanced builders' section... then follow the links...

good luck!

JD
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