Right now I am running one step colder iridiums and the cars seems to be running fine. I am dropping to a 2.7 from a 2.8 pulley and getting tuned for my meth kit next weekend. Should I swap spark plugs to two step colder, copper or what?

 

You dont need to go 2 steps colder with those mods...the meth kit lowers the temp is the combustion chamber which allows you to run a hotter plug...I recommend 1 step colder coppers...

 

very good young grasshopper...

 

John I know where we can get some BK7RE coppers locally if you want to do them while we're at it. That's what I run, and that is what I recommend on your setup.

 

where locally?

 

I did some testing with some copper plugs and iridium plugs and found this:

I could run the Iridium plugs no problem with stage 2 (3.06 in) and stage 3 (2.99 in) pullies. Once I switched to my 2.9 pulley the Iridiums started causing rough idle and problems with acceleration. Once I put in the coppers the idle is smooth and the acceleration is like it should be again. I think it is a combination of the Iridiums not being able to move heat as fast plus the Iridiums having to have a smaller gap to prevent spark blowout that was causing my problems. The coppers just keep the temps down more plus they allow me to run the gap at .39 ~ .40 where as I was having to run the gap at about .35 ~ .36 with the Iridiums to make it run halfway decent.

 

hey guys im on stock plugs now....*not to thread jack*....what are some good ones i was thinking NGK but what type and size and all that

 

What do you have done to the car?

 

currently injen intake just starting mods.....next week i get cat back and BM shift + and thats all ill prolly do for awhile....atleast till spring

 

do you have a 2.0sc or a n/a 2.4?

 

hahah i got a 2.2

ba bump

 

Stay with the factory heat range untill you are boosted.

 

You could change out the plugs if you want, but stay with the stock heat range.

Of course, you can always use another brand of plug if you want to but stay in the stock heat range. Changing your spark plugs doesn't net you any HP gains (unless the plugs are fouled of course), so there is no reason to change them unless you have to.

 

okay will do.....im quite a noob what is the heat range and does NGK make replace ment plaugs for the balt with the factory range?

bump!

 

NGK Double Platinum PTR5A-13
NGK IX iridium LTR5IX-11

Stock gap is .053"

 

which is better iv herd iridium is that true?

 

Iridium dissapates heat quicker than platinum and lasts longer than platinum, so you could say it is better. It also costs quite a bit more, which isn't better...

 

mods in sig, my car wot 2nd it hiccuped a few times, and it would cut out but go right back to accelerating do i need to change plugs???

 

You can always try the plugs. Hiccups are kind of hard to diagnose with a log. Could be number of things. Plugs are a cheap and easy thing to replace and gap.

 

My car "hiccuped" when I was GM stage 2 and then when I got one step colder iridiums gapped to .040 it ran better, but since I have dropped pulleys again and running meth...my last WOT pull in 2nd it "hiccuped"

 

my car would do that before i dropped to brk7e's , it wasn't often maybe only 3 times in the 2+ years ive had stage 2. After gapping the colder plugs to .35 i haven't had any issues since.

 

Bump
+2pts for resurrecting an old thread rather than creating a new.

I currently have GM Stage 2, Injen CAI, and Corsa exhaust. What plugs should I be running?

 

You could run 1 step colder plugs if you wanted but it isn't necessary, the stock plugs should be ok. If you are planning on dropping the pulley size below the GM stage 2 then you should definately drop one heat range on the plugs.

 

I am running a 2.7 ZZP pulley with meth 60lbs etc...I run 18.5psi boost and I run the Iridium NGKs BKR7EIX one step colder at .30 - .28 gap. shift at 7400rpms with no spark blow out. works awesome.