What spark plugs do ported high boosted guys run these days?

[ChicagoMike]

I currently have NGK BR7EF (with the V-Groove *not* BR7EFS solid) gapped at .028 and I notice some lag at low RPMs (like someone just threw out an anchor, weird pulling feeling like it gets dragged back then goes) but once it gets up there it GOES. I have a couple thousand miles on them so it's probably time for some new plugs.

I'm going to do this when it comes out of storage in the Spring, and possibly upgrade to the 60,000 volt coilpacks and Granatelli COPS.

Ported eaton, 3.1 upper/6# lower for 16-17 lbs. of boost.

Recommend plug and gap? using the granaetelli upgrade, I can supposedly open up the gap... so I was thinking about .035 ?

Mike

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[wizdawg]

So far the car is running good with the BR7EFS at 0.028. 2.93/4# ported. I was thinking about opening it up some though.

 

[Oncebitten03]

.028 on just boost is too tight, open it up some

i run tr6's around .034-.036 on boost (ported eaton, 18-19lbs) and around .028 with a 100shot

 

[wizdawg]

Hey regis,

This may be a dumb question, but do you think there is power to be had going from .028 to .036?

-Brian

 

[zenriddles]

Honest question = I'm Old School, Windsor heads.
I would say run copper plugs at .035 and change them every 20 k or so.
Platy's and Iridium with boost are a no no in my world, too hot, causes detonaton.

These OHC blown motors don't seem to mind as much. Enlighten me?

 

[Marko]

.028 on just boost is too tight, open it up some

i run tr6's around .034-.036 on boost (ported eaton, 18-19lbs) and around .028 with a 100shot

The shop I took my car to gapped my tr6 plugs at .028 with just stock blower,2.76 upper only,4pc.idlers,k&n fipk,flowmaster catback and dyno tuned with xcal2.

The car runs/idles great.

What are the disadvantages of too tight of a gap?

Thanks.

 

[wizdawg]

What are the disadvantages of too tight of a gap?

Thanks.

That was my question too. Can you lose power with a gap that is too small?

 

[Bob_Kurgan]

all boosted cars that i work with run small gaps.. i suggest going with a gap no bigger then .030 but more along the lines of .025... i tested gapping on the dyno and showed an increase in power from .030 to .025.. (yes, backwards you might think).. the spark burned cleaner and the car accelerated smoother..

 

[Bob_Kurgan]

Honest question = I'm Old School, Windsor heads.
I would say run copper plugs at .035 and change them every 20 k or so.
Platy's and Iridium with boost are a no no in my world, too hot, causes detonaton.

These OHC blown motors don't seem to mind as much. Enlighten me?

i would say no to copper, but i run iridiums now on my car this year.. picked up 8rwhp average and 5rwhp at peak... this was on a 1122rwhp car.

 

[The Pun]

So Bob, IMO what is your ideal plug and gap for my combo? :biggthump

2.2 Kenne Bell
20 lbs boost
50/50 - 93/100 octane mix
all the supporting mods..

 

[Bob_Kurgan]

So Bob, IMO what is your ideal plug and gap for my combo? :biggthump

2.2 Kenne Bell
20 lbs boost
50/50 - 93/100 octane mix
all the supporting mods..

personally, you gain nothing by going bigger then .028.. so, i would go .025-.028 and call it a day..

 

[Ear Rak]

personally, you gain nothing by going bigger then .028.. so, i would go .025-.028 and call it a day..

damn it jeff, we took all that time to make sure those plugs were at .032

 

[Bob_Kurgan]

damn it jeff, we took all that time to make sure those plugs were at .032

honestly, if there is no sign of spark blowout, then i wouldnt be the least bit concerned..

 

[The Pun]

honestly, if there is no sign of spark blowout, then i wouldnt be the least bit concerned..

They seem to run pretty damn good but I am no expert. I am running NGK BR-7's

 

[cobravenom39]

They seem to run pretty damn good but I am no expert. I am running NGK BR-7's

I'm running the same plugs gapped at .28

 

[The Pun]

I'm running the same plugs gapped at .28

Hi Andy!!!