spark plugs and turbos
I've run a set of BR7EF plugs in my truck for damn near 20k miles without any sign of fouling and I rarely got into it and it was just stuck in mostly stop and go on a daily basis... pretty much the worst conditions for a cold non-projected tip plug. It never had a single driveability problem and never even came close to fouling out. Yes I know every combo is different but I've yet to see a reason to bother with a projected tip plug in a higher boost application when the non-projected tip plugs don't have problems to begin with.
What I would love to find however is an 8 or 9 heat range standard copper plug that has a resistor with either gasket seat or taper since either will work. For 800+ I still much prefer to run a colder plug than a BR7.
What I would love to find however is an 8 or 9 heat range standard copper plug that has a resistor with either gasket seat or taper since either will work. For 800+ I still much prefer to run a colder plug than a BR7.
I've run a set of BR7EF plugs in my truck for damn near 20k miles without any sign of fouling and I rarely got into it and it was just stuck in mostly stop and go on a daily basis... pretty much the worst conditions for a cold non-projected tip plug. It never had a single driveability problem and never even came close to fouling out. Yes I know every combo is different but I've yet to see a reason to bother with a projected tip plug in a higher boost application when the non-projected tip plugs don't have problems to begin with.
What I would love to find however is an 8 or 9 heat range standard copper plug that has a resistor with either gasket seat or taper since either will work. For 800+ I still much prefer to run a colder plug than a BR7.
What I would love to find however is an 8 or 9 heat range standard copper plug that has a resistor with either gasket seat or taper since either will work. For 800+ I still much prefer to run a colder plug than a BR7.
5791 on low boost low compression combos
7173 for a little hotter setups that really make some heat
7405 for the really heavy hitters
There is NO need for a non-projected tip plug on a blower/turbo application if it's tuned properly. The tip on this cold of a plug should not be glowing red on the next cycle which is what you combat by using a non-projected tip plug. Now on Nitrous deals it's a good idea because you are injecting a more oxygen enriched atmousphere into the engine and it burns hotter than fresh air compressed. This is when I use non projected tip plugs.
BTW there is no such thing as a TR7 or TR8 plug unless your talking about iridium plugs which are TR7IX and TR8IX. And those are both projected tip plugs.
The plugs I use above are also gasket seat plugs. They seal better than taper seat plugs and they will work in your LS1/2/3/6/7/9. Every one of those with OEM cylinder heads I have used gasket seat plugs in. When you start making power with a taper seat you'll see antiseeze (if you use that stuff) shot out around the plug!
7173 for a little hotter setups that really make some heat
7405 for the really heavy hitters
There is NO need for a non-projected tip plug on a blower/turbo application if it's tuned properly. The tip on this cold of a plug should not be glowing red on the next cycle which is what you combat by using a non-projected tip plug. Now on Nitrous deals it's a good idea because you are injecting a more oxygen enriched atmousphere into the engine and it burns hotter than fresh air compressed. This is when I use non projected tip plugs.
BTW there is no such thing as a TR7 or TR8 plug unless your talking about iridium plugs which are TR7IX and TR8IX. And those are both projected tip plugs.
The plugs I use above are also gasket seat plugs. They seal better than taper seat plugs and they will work in your LS1/2/3/6/7/9. Every one of those with OEM cylinder heads I have used gasket seat plugs in. When you start making power with a taper seat you'll see antiseeze (if you use that stuff) shot out around the plug!
Sounds fine to use on a little more boost in your set-up with that gap still. If you have any issues just tighten it down to .020" and you should be good to go.
We mainly use the projected tip 8's in customers cars, but we have some cars we put BR7EF's in as well. I'll be using a projected tip 9 on my new build though as I've seen some other heavy hitters in the heads up classes running projected tip 10's in there set-ups.
The part numbers for the projected tip plugs I'm speaking of are R5724-7, R5724-8, R5724-9, R5724-10.
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TECH Fanatic
Joined: Jan 2010
Posts: 1,343
Likes: 2
From: South of Augusta,GA
I'm glad you're around here now.
Sounds fine to use on a little more boost in your set-up with that gap still. If you have any issues just tighten it down to .020" and you should be good to go.
We mainly use the projected tip 8's in customers cars, but we have some cars we put BR7EF's in as well. I'll be using a projected tip 9 on my new build though as I've seen some other heavy hitters in the heads up classes running projected tip 10's in there set-ups.
The part numbers for the projected tip plugs I'm speaking of are R5724-7, R5724-8, R5724-9, R5724-10.
Sounds fine to use on a little more boost in your set-up with that gap still. If you have any issues just tighten it down to .020" and you should be good to go.
We mainly use the projected tip 8's in customers cars, but we have some cars we put BR7EF's in as well. I'll be using a projected tip 9 on my new build though as I've seen some other heavy hitters in the heads up classes running projected tip 10's in there set-ups.
The part numbers for the projected tip plugs I'm speaking of are R5724-7, R5724-8, R5724-9, R5724-10.
TECH Apprentice
Joined: Dec 2004
Posts: 358
Likes: 1
I use the NGK iridium plugs in my NA LPE ZR-1 LT5 engine but most folks have had troubles and warned me against trying them in the TTiX turbo LS6
I'm interested in going E85 in the car and am very curious about this. maybe folks aren't regapping them. turbo buick guys (I had one of those too) warned me also that the iridiums don't like boost.
guess that doesn't make sense to me unless I know WHY. maybe they were gapped too wide.
good thread. I've had some troubles with the #7 plug losing the electrode. funny thing is that the plug doesn't look hot. almost wonder if it's clipping the piston or something weird. almost looks like they have been "clipped" like in a top fuel car.
thanks for the advice!
I'm interested in going E85 in the car and am very curious about this. maybe folks aren't regapping them. turbo buick guys (I had one of those too) warned me also that the iridiums don't like boost.
guess that doesn't make sense to me unless I know WHY. maybe they were gapped too wide.
good thread. I've had some troubles with the #7 plug losing the electrode. funny thing is that the plug doesn't look hot. almost wonder if it's clipping the piston or something weird. almost looks like they have been "clipped" like in a top fuel car.
thanks for the advice!
i like the 4177 ngk tr6, its tried and true in probably 20 of our setups
the br7ref runs like trash sometimes, other setups i cant even tell the difference,
i run the tr6 and 22lbs of boost, pumpgas and methanol in nearly everything i have built at .22-24
either works great, but i think the tr6 is a better street car plug, drives great, good mileage, good cold idle, good under power etc etc
the br7ref runs like trash sometimes, other setups i cant even tell the difference,
i run the tr6 and 22lbs of boost, pumpgas and methanol in nearly everything i have built at .22-24
either works great, but i think the tr6 is a better street car plug, drives great, good mileage, good cold idle, good under power etc etc
TECH Fanatic
Joined: Nov 2001
Posts: 1,027
Likes: 2
From: KS
