I just e-mail Hahn Racecraft to ask them what plugs they use for high boost application. So they answered :

"NGK plugs or Nippon/Denso plugs is all we use (up to 30psi). We just use the standard copper, and change them once or twice at year."

Also, Kenne Bell (on their web site) states that the plugs to be used on a supercharged vehicle are :

-One heat range cooler than stock. Denso U-Groove plugs (standard plug) work very well for us. Avoid Platinum plugs. Always set gaps at .035".

ALSO please read this important article from Kenne Bell :

http://www.kennebell.net/techinfo/ge...SPARKPLUGS.pdf

Also, Intense Racing states for the LSJ :

"The stock spark plugs for the LSJ motor are NGK PFR6T-10G platinum plugs. Platinum and iridium plugs are much harder and more expensive metals that can last up to 100,000 miles however they are not the best metal for heat dissipation. In our experience copper based plugs are far superior in supercharged applications and while they may not last as long as platinum or iridium plugs they will offer better performance. In addition to being copper based these plugs are also one heat range cooler than stock which helps reduce the possibily of detonation and the resulting knock retard.

Finally, I saw on a Denso Iridium web site that a too small electrode have more difficulty to dissipate heat.

 

Really good find indeed.thanks..+rep given

 

good info!
though i strongly disagree with someone saying "Always set gaps at 0.35"

thats a kind of ignorant statement.

 

if stock set to .35

 

Good info. My NGK BKR7E plugs were great to me.

So what do these guys think of the ZEX plugs?

 

I'm using some NGK copper plugs recommended for the 2.4 turbo guys at the solstice forum. At 9.99/ea they better be worth it.

 

My NGK copper plugs were 9.99 for the set of 4.

 

gotta get these in asap. I'm going to check around at stores so I can get them quick. I just did stage 2 and I'm getting a CEL about every other day. Thanks for the info tony!

 

cels for what???
you should not be getting cels with the stock plugs on stage 2 at all

 

dont know what the code is but its definatly from the stage 2. Ctcobaltsss says that's prob. The issue

 

Pretty hard to be 100% sure if you don't know what the code is.

 

Yeah bro definitely change your plugs. Get the NGK BKR7E Copper plugs.
Obviously it's 100% the plugs but you want 1 step colder plugs anyway.
Another thing it could be is a lean code because of your intake but the stage 2 reflash is upposed to get rid of it.
I'm running the ZEX plugs now and i'm getting knock during shifts. It could be the heat but the NGK's worked so well for me, i'm going back to them.

If you need any help swaping plugs let me know i'll do it for you.

 

knock during shifts is usually just phantom knock.

do you have mounts or a damper?
that will usually excentuate it too.

 

Yep, ingalls ETD set really squishy @ 14. I'm sure it's phantom knock.
As soon as it comes time to change plugs i'm going back to the NGKs.
They were great plugs. I'm curious to see what the ZEX plugs are going to look like after I pop them out.

07BaltSS should get colder plugs. I'm curious to see if that helps. It should.

 

0.35 ws useless for me, i was blowing out spark like crazy, even at .032 i was having issues near redline, messed with spark dwell on hpt and have the bkr7es gapped at .030 and its perfect.
this is pushing about 16-18 pounds of boost depending on the weather.

 

yep i have an ingalls too, definately causes a little phantom knock between shifts.

Im really happy with my NGK coppers too.
just checked them and altered my gap the other day. 15000kms on them and the tips are in perfect shape. nice soft brown coloring.

 

i have the ingalls set at its tightest and front and rear motor mounts, i get no phantom knock.......

 

record your knock with your interceptor record function and go back and look through.
i garuntee youll see a few blips on it at shift points.

 

hmmmmmmm, interesting, ill have to do that.

 

its nothing major....just the stiffness from the damper giving vibration enough to make the knock sensor think its detecting engine knock.

 

thats what mine does. everyone freaks when they see my part throttle logs. then i mention it has a ttr mount. everyone rejoices



i have the ngk 7's gapped at .36

i have said the exact same thing that the "experts" said for many years

 

That's interesting......

Will do. I have been meaning to do that.

When I watch the gauge I only see knock during shifts. From .3 to 1.8 or so.

 

so i was able to find the plugs right at advanced auto. It even sounds like it runs much better. No engine lights yet either. Thanks tony! Great sucess! Lol