JASON11WS6

iTrader: (7)

Just looking to see what kind of plugs and gap all the Procharger guys are running here. I've been waiting to finish a motor build up to put the blower in but I can't wait any longer. I am just gonna toss in the headers, blower and misc bolt ons for now. Since the headers will be off I figured I toss on a set of new wires and plugs. What plug and what gap? This will be on a bolt on car with a low boost D1SC head unit.

EPP

iTrader: (22)

NGK 4177 TR6 set at .035. Bob

JASON11WS6

iTrader: (7)

That's kind of what I was thinking. Any changes with more boost? Less gap maybe?

Jontall

NGK TR6 set at .035 may blow-out at high RPM. I gap mine at .025, this is also what Kenne Bell recommends. http://www.kennebell.net/techinfo/ge...C_KitParts.pdf

EPP

iTrader: (22)

As you up the boost, you may need to decrease the gap, as has been posted. We haven't seen a need to tighten up the gap much though based on what we have seen on our dyno. Bob

blacksi

iTrader: (3)

Is there actually a HP gain from running a wider gap?

EPP

iTrader: (22)

I am no expert on spark plugs, but I have always heard the wider the gap, the larger and higher voltage will be the arc. It takes higher voltage to jump a larger gap. I would always run as large of a gap as you can without having the spark blow out from the boost. Bob

moehorsepower

iTrader: (3)

Bob is correct, the larger the gap the more demand on the electrical side of the house, just make sure you have good hot coils and good plug wires...

macleod

iTrader: (2)

So if the gap is what decides how hot the spark is then what is the deal with "colder" plugs??

blacksi

iTrader: (3)

That all makes sense but what is the advantage of having a larger gap? I wonder if it just burns the fuel better? Does that mean more power though? Is a larger gap then creating more heat causing possible detonation?

Spritle

x100000000

Tried and true setup.

ZDOG

iTrader: (13)

when you guys say lower the gap with more boost im assuming your going with .35 for 8lbs. now adding 3 or four lbs is that enough to start to worry about a smaller gap?

Disturbed Bird

iTrader: (9)

what do you recommend for a F1a? running 12-16lbs

vrybad

One step colder will lower combustion chamber temps about 100 Degrees celsius or about 200deg F or so.
The cooler plug transfers more heat to the cooling system.

I spoke to NGK and based on my conversation with them , I went to a TR7 IX, iridium, #3690, which I gapped at .035.
I was running the TR6, but wanted to try a slightly cooler plug.

2002 C5 Z06
Stock engine
APS TT kit
9psi
572rwhp/606rwtq
pump gas, no meth

So far so good, but I've only got about 300 miles on them, and a few 4th gear pulls, but they run great so far.
I pulled one to take a peek, and it looked perfect, no indication that it may be prone to fouling.