stevecritt

iTrader: (3)

Need some help on what plugs to run. Right now I'm running NGK iridium plugs. Seem to be working real great, nice a brown. Should I change? If so to what, and what gap?

NitrousExpress

iTrader: (4)

How much are you spraying? Whats your compression ratio?

-Garrett

stevecritt

iTrader: (3)

11.4 to 1 150 shot

stevecritt

iTrader: (3)

I take that back, I looked at the wrong plugs. I have auto lite platinum 5245 don't know much about plugs.

ZONES89RS

iTrader: (25)

BR7EF NGKs and gap then to .030. See how it likes that.

stevecritt

iTrader: (3)

what if any will that hurt na performance?

speedtigger

iTrader: (16)

It should not affect performance to go to a colder plug. What you have to look for is how clean the plug stays. Hotter plugs stay cleaner over time.

HCI2000SS

iTrader: (2)

I'm running BR7's gapped at .030, and it did not affect my n/a performance whatsoever

NitrousExpress

iTrader: (4)

One of the most common plug that we recommend is the NGK BR7EF in fact it is what I Personally run in my truck. I have played around with a couple of different heat ranges to see if i could tell a radiance off nitrous and other than a couple of HP on the dyno I could not tell while driving the truck at all. I do also recommend gaping them to .030 - .035.

Trey

stevecritt

iTrader: (3)

Thanks. Well I sat on the phone with summit and called NGK and this is what we came up with. 4177 - NGK V-Power Spark Plugs. Because my autolite 5425s were a 4 on ngk heat scale, we went down 2 sizes from that to a 6. Let me know if this sounds correct.

http://www.summitracing.com/parts/ngk-4177

stevecritt

iTrader: (3)

I will gap them as you suggested.

speedtigger

iTrader: (16)

That is a TR6. It is as good N/A plug, but not recommended for nitrous.

The NGK part number for the BR7s is 3346. Most guys say they use those up to a 175 shot.

stevecritt

iTrader: (3)

They use the BR7s for up to 175 shot?

stevecritt

iTrader: (3)

Just for future reference, why are the Tr6 not good for nitrous? I'm having some trouble with the spark plug dilemma.

speedtigger

iTrader: (16)

Yeah, or more. I have been using Br7s for up to 150 shot for a year or so. A few guys have told me that when I step up to a 200 shot that I should go to a B8EfS Part#1049. I have a couple boxes on the shelf for this fall.

speedtigger

iTrader: (16)

The TR series plugs have an extended porcelain and anode that reaches further into the chamber. They improve combustion, reduce emissions and stay cleaner. However, the exposed anode and porcelain can overheat and are more vulnerable to detonation associated with nitrous, so they can get you in trouble.

For quite some time the TR6 was the nitrous plug of choice for LS guys, but as the community has learned more about reading plugs and detonation failures, they have migrated to the Br7s and B8es plugs respectively.

ZONES89RS

iTrader: (25)

I had a pic somewhere if a tr6 and a br7 side by side somewhere.

Tr is a projected tip as speed said. The BR is a nonprojected tip that is much better for nitrous and boost applications where detonation is a concern.

speedtigger

iTrader: (16)

Found this in a Google Images search:



BR7 is on the left. TR6 on the right.

ZONES89RS

iTrader: (25)

Hahahahah, you googled my pic.

HCI2000SS

iTrader: (2)

I went through the whole TR6 vs BR7 battle when doing the nitrous (TR6 is what I had) and bottom line for me....if the BR7 cost me like 2 hp, and lasts only half as long as the TR6 then that's more than worth it for the peace of mind knowing that I can run my nitrous much more safely