what plugs for supercharged 08-up 3 valve?

[stkjock]

Dave - I didn't say up to .036-.038

I know, I did.

I did, howver, say .032-.035. Which is safe.

I'll stand by my opinion of it being safe.

I'm not saying it's not safe, the last statement you made was "optimal"

 

[hamish]

Ngk iridium one range colder. Gapped somewhere between .028 -. 032" just can't remember. Somewhere between 10-15 psi. Can't remember lol. 94 octane.

 

[06 T-RED S/C GT]

That decimal point makes a big difference my friend.

I can't see he's running a stock short block, .032 is fine up to 12 I'd agree, ideal, I disagree, at 8 psi I think .036-.038 is better.

I'm running between 7-8 psi boost on a Saleen VI blower in which both Saleen and Brenspeed recommend Autolite HT0 plugs gaped @ .032.. JDM on the other hand recommends gaping @ .035..

In the end, I chose to follow Brenspeed and Saleen's recommendation.. Just my $.02

For all the people recommending Brisk or Autolite HT0, I think you all missed the part where he said he had the newer style 08+ heads.

The correct plug will be the NGK 7554 as Abdulla recommended. These will be the same as the Ford Racing plugs listed on some websites for this application.

Being that he's running the newer style 08 heads.. I would also agree with Abdulla's recommendation for the NGK 7554 plugs as being the correct ones for his particular application as well..

 

[Pentalab]

I'm running between 7-8 psi boost on a Saleen VI blower in which both Saleen and Brenspeed recommend Autolite HT0 plugs gaped @ .032.. JDM on the other hand recommends gaping @ .035..

In the end, I chose to follow Brenspeed and Saleen's recommendation.. Just my $.02

Both Roush + VMP say to use .035" for 5-6 psi.
Both say to use .032" if using 8 psi.
As boost increases > 8 psi, the gap just keeps getting even less, with the exception of using more voltage.

 

[drive_55_not]

Both Roush + VMP say to use .035" for 5-6 psi.
Both say to use .032" if using 8 psi.
As boost increases > 8 psi, the gap just keeps getting even less, with the exception of using more voltage.

For DD'ing I run the NGK 7554 gapped @ .032" currently pushing 16psi with no spark blowout.

I switch to the Brisk 2 step colder gapped @ .030 when tracking the car, no issues with spark blowout spaying a 200shot either.

.

 

[06 T-RED S/C GT]

Both Roush + VMP say to use .035" for 5-6 psi.
Both say to use .032" if using 8 psi.
As boost increases > 8 psi, the gap just keeps getting even less, with the exception of using more voltage.

I agree with Roush and VMP recommending .035" for 5-6 psi.. I run a 3.6" pulley on my Saleen blower that produces between 7-8 psi @ WOT which is why Brenspeed recommends gaping @ .032

I also agree with you regarding as boost increases, the gap continues to decrease even more as well

 

[pics06gtstang]

HTO , 28/30 , mine was @ 30 @ 11.5 psi

 

[AbdullaGT500]

DO NOT USE BRISK PLUGS. I had TWO sets of brand new plugs that were bad. Swapped them for the NGK's and never had another problem.

 

[Pentalab]

DO NOT USE BRISK PLUGS. I had TWO sets of brand new plugs that were bad. Swapped them for the NGK's and never had another problem.

How long ago was that? I have had mine in for several years now (I think at least 3) on my 2010. But they are normal heat range, gapped to .032"..and low boost, 5.8 psi. Zero problems, runs like a top, even in freezing wx..and in summer.

Did yours go bad right off the bat, or shortly afterwards? One plug..or several of em ?

 

[AbdullaGT500]

How long ago was that? I have had mine in for several years now (I think at least 3) on my 2010. But they are normal heat range, gapped to .032"..and low boost, 5.8 psi. Zero problems, runs like a top, even in freezing wx..and in summer.

Did yours go bad right off the bat, or shortly afterwards? One plug..or several of em ?

The first set went bad shortly after, the next set was brand new and was bad. Not sure if one plug or all, never had any misfire codes, just hesitated big time under boost. I never had problems with them on the early style heads, just on the later ones. Stopped immediately with the NGK plugs.

 

[Pentalab]

The first set went bad shortly after, the next set was brand new and was bad. Not sure if one plug or all, never had any misfire codes, just hesitated big time under boost. I never had problems with them on the early style heads, just on the later ones. Stopped immediately with the NGK plugs.

Was this on a GT-500 ? What year was the early style heads ? Or is this on a plane jane GT ?

 

[BruceH]

How long ago was that? I have had mine in for several years now (I think at least 3) on my 2010. But they are normal heat range, gapped to .032"..and low boost, 5.8 psi. Zero problems, runs like a top, even in freezing wx..and in summer.

Did yours go bad right off the bat, or shortly afterwards? One plug..or several of em ?

Brisk are well known for having issues. Some people never have a problem but there have been so many with issues that I'd never run them.

OP, what Sqwerl said is right on the money. NGK are the same as FRPP for this style of head. You can get them from Rock Auto for a good price.

I've always went for .032 on 3v forced induction gaps. The reality is that a wide range of gaps will work.

Basic electronics parameters tell us that more gap means more voltage due to increased resistance but the lower amperage that results from more resistance means the spark can be blown out easier.

What's been proven to work reliably for a whole lot of forced induction 3v owners is anything from .028 to .032.

 

[AbdullaGT500]

Was this on a GT-500 ? What year was the early style heads ? Or is this on a plane jane GT ?

This was on a 2006 Mustang GT 4.6L. I used brisk plugs on the factory heads(old style). Then when I built the motor I went with newer style heads.
Early style heads are 2005-mid 2008. The newer continued in mid 2008 til 2010.

 

[mitchell20501]

Replaced with the ht0 at .030. Used some compressed air to blow it out but never seen anything.

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[stkjock]

Pic no good

 

[eighty6gt]

Pic is loading for me, plug half melted away, got lucky the engine is together.

Wondering what the particulars of the build are?

 

[stkjock]

that looks like too much heat

Pic is loading for me, plug half melted away, got lucky the engine is together.

Wondering what the particulars of the build are?

because he fixed the pic this morning.

 

[06 T-RED S/C GT]

Just took my step colder ford racing plugs out with less then 10000 miles and look what I found

View attachment 55772
Replaced with the ht0 at .030. Used some compressed air to blow it out but never seen anything. [emoji15]
Lean condition maybe?

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Was this the only plug affected or were there more ? From what I can tell in the pic you posted, It's possible that a factory defect could had been the cause, but highly unlikely as I've never seen a plug melt away like that due from a defect..

Therefore I agree it was from too much heat that caused your plugs to melt away.. Btw: have you contacted Ford Racing about this yet ? If you haven't, I would recommend getting a hold of them and bringing this to their attention A.S.A.P..

 

[mitchell20501]

I know this sounds retarded but even the porcelain looks melted. I put the ht0 plugs in and it runs better then ever. I can take more pictures if you guys want. I'm not trying to thread hijack, just putting some experience with 2 different types of plugs out there for OP.


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[06 T-RED S/C GT]

I know this sounds retarded but even the porcelain looks melted. I put the ht0 plugs in and it runs better then ever. I can take more pictures if you guys want. I'm not trying to thread hijack, just putting some experience with 2 different types of plugs out there for OP.


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Yes ! from what I can see, the porcelain does appear to look melted as well.. Just another reason why you should contact Ford Racing and bring this to their attention, as you deserve an explanation from them..
As it's possible that a manufactures defect could be responsible