Iridium plugs
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,340
From: Gilbert AZ
Haven't put mine in yet but several friends love them. Other popular choice is the ac delco zr1 plugs. Factory zr1 plugs, also used in LSA/etc. Plenty of high boost Camaros making 700-1000rwhp on zr1 plugs.
AC Delco 41-104
AC Delco 41-104
Pro
Joined: Nov 2007
Posts: 605
Likes: 15
From: Rocky Mountains Colorado
I'm at 10lbs of boost and using the TR7IX. At the track (1/4 mile) with the AC Delco 41-104 and/or TR6, I was picking up random knock. I have not had a problem with random knock using the TR7IX.
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
or two. But once they are warmed-up they are fine. They only last about
25k then they go down hill. Proven by adding a fresh set. Car runs better. But they are cheap! Seems the 7's would be too cold but
engines vary a little.
Le Mans Master
Joined: Apr 2011
Posts: 7,820
Likes: 408
From: Montreal
St. Jude Donor '13
There seems to be a thousand different options on this. Personally, I wouldn't use a projected tip plug on a boosted application. Many use the NGK and like them. I am using Brisk Silver Tip Racing plugs. They run perfectly and last a long time.
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Safety Car
Joined: Dec 2010
Posts: 4,150
Likes: 379
From: Detroit
For your power level OP you should be running atleast 8's. Iridium is fine but i've always ran the copper plus i check and change them often. Some may complain about a colder plug not starting or whatever but have it tuned correctly and it will be fine. Keep your setup safe and run the correct plugs.
Drifting
Joined: Apr 2008
Posts: 1,955
Likes: 22
From: Lehigh Valley Pennsylvania
Most every vette I've seen coming through my buddy's shop had tuning issues due to the Iridium Plugs, mine included. That tip stays too hot and causes all kinds of detonation. Best to go with copper like most do with FI Applications.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,340
From: Gilbert AZ
Exact opposite experience here. Iridiums cleared up all sorts of random knock. No issues at all with them.
On several big boost cars (35-45+psi) they just stutter and have all sorts of issues but a set of iridiums clears it up.
On several big boost cars (35-45+psi) they just stutter and have all sorts of issues but a set of iridiums clears it up.
Melting Slicks
Joined: Oct 2007
Posts: 2,569
Likes: 170
Of course if you hurt a plug the aren't as forgiving as copper.
Both the Denso and NGKs are good plugs for these cars.
Le Mans Master
Joined: Jul 2005
Posts: 7,405
Likes: 353
From: New Castle Del.
St. Jude Donor '09
ZR1 plug is WAY to hot for that much hp... There is certain "tuner" Who uses them in 2010+ camaro stuff but i HIGHLY suggest not using them
Run the Plug you were running ... No need to switch
Last edited by Frans96ss; Jan 19, 2014 at 09:21 PM.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,340
From: Gilbert AZ
Agreed but I still like iridium, 7ix or 8ix. That was 4 months ago, agreed that the zr1 is too hot for much over 650hp.
Safety Car
Joined: Dec 2010
Posts: 4,150
Likes: 379
From: Detroit