Where are you guys finding these?

 

What about this: http://www.gtmotorsports.com/product...roductid=17182

 

who uses copper plugs anymore???

 

I tried to find them and couldnt, had to go with Iridiums

 

i'm not sure why OP wants 2 steps colder, i've heard 1 is just fine for most boosted applications.

that said, paying $25 for the HKS per plug is pretty ridiculous. even the $10 for an ngk plug is pricey. you can spend a couple dollars on a copper plug and replace them twice as much if need be.

 

there are no such thing as 2 step colder coppers. must use iridiums.

 

Meatbag how much power are you going for. I made 900bhp on 1 step colder plugs with no det problems.

And you can get those at...jees....autozone, pepboys, wherever. And they are like $2 ea.

Iridiums are $$$$ and don't really last any longer if the tune is right.

tom

 

I was just seeing what the absolute max I could do on a streetable pump gas tune. Was looking for anything that could help.

 

/\/\/\
Hmmm, I see what you are saying but don't know how much its really gonna help (in absolute terms).

Guess you would want full knock control on each cylinder to have the thing on the ragged edge for power.....but I think most have shown that pushing pump gas only lends itself to big problems...

Where are you pump numbers at so far and on how much boost?

Tom

 

620@18psi Going to take it up to 25psi if i can just to see. Albeit with alot less timing. Although with my setup I seem to be able to run more then other people and not knock.

 

What compression ratio? That's great pump gas power. What EMS? Regardless, nice work.

 

Meat,
I just tapped 650rwhp on pump gas (19psi...ok to dyno but I'll back it down a touch on the street)....

took 60mm turbo's and 272 cams (And the Larry Prebis "can't break me" tune).

Tom

 

I supposedly have the HTA 76mm turbos from FP but that's another story. I could have regular 20g or even 18g turbos for all I know since I haven't had the time to yank them out and spec them.

I have JWT S7 cams and stock manifold with a spacer at the moment. Do you have any idea how much total timing you are running to make 650@19psi?

Edit: 8.5:1 CR