Evo IX copper plug alternative?

Reply Subscribe

Thread Tools

Search this Thread

Sep 28, 2011 | 01:46 PM

#16

turbotalawd

Evolved Member

iTrader: (11)

Joined: Sep 2009

Posts: 515

Likes: 1

From: U.S.

Quote:

Originally Posted by Pal215

I had my car dyno'd on a dynopack dyno with iridium plugs and it made 320awhp on 91. It started to break up a little bit, so we took the plugs out and gapped them to the correct gap. After another dyno run the car made the same power and ran without any issues even on high boost. What do you mean by "making them worthless?"

For every 100hp over stock, its recommended you run 1 step colder plugs.

Well the whole point of iridium plugs is to have that iridium coating on them. Once you scrape that off, it becomes a normal copper plug.

You have the right idea of getting colder plugs as your hp goes up. Thats why im saying it makes no sense to put in a plug with a hotter heat range than stock especially when the car is modified.

Last edited by turbotalawd; Sep 28, 2011 at 01:56 PM.

Sep 28, 2011 | 02:00 PM

#17

Spec-Ops1

Account Disabled

iTrader: (38)

Joined: Jun 2010

Posts: 1,229

Likes: 1

From: Fayetteville,NC

That is why you gap the iridium plugs with a feeler gauge... I even gap the copper cores with a feeler gauge...

Sep 28, 2011 | 02:33 PM

#18

turbotalawd

Evolved Member

iTrader: (11)

Joined: Sep 2009

Posts: 515

Likes: 1

From: U.S.

Quote:

Originally Posted by Freddie@Spec-Ops

That is why you gap the iridium plugs with a feeler gauge... I even gap the copper cores with a feeler gauge...

Doesnt matter which method you use to gap the plugs youre still scraping off the iridium.

Sep 28, 2011 | 03:16 PM

#19

JohnBradley

Evolved Member

iTrader: (30)

Joined: Jan 2004

Posts: 11,406

Likes: 78

From: Northwest

Quote:

Originally Posted by turbotalawd

Doesnt matter which method you use to gap the plugs youre still scraping off the iridium.

Not if you do it right. Trust me, if I had ruined my .018 gapped plugs I couldnt have done 40psi/830whp on stock ignition with bad plugs. There is a right way and its very possible. Feeler gauges dont scrape if you know how to use them. Altering the gap if you go to far isnt hard if you think about what you cant do to widen it back out.

However that part number shows (PLFR6A-11) the same price as the ILFR anyway.

Last edited by JohnBradley; Sep 28, 2011 at 03:35 PM.