Hey a got a 06 cobalt ss supercharged 60lb injector cold air intake, 2.9 zzp Pully, ottp stage 2 heat exchanger, wondering should I run a step or 2 colder plugs? And if so what should I gap em at, and what are the advantages of running colder plugs,
Thanks
BoostWhore

 

I was just on ZZP site wondering the same thing for my 2.9 pulley so I came here to search and you beat me to it. Whats the verdict on Iridium plugs? From the ZZP site:

Choose stock heat range for cars with stock pulleys down to 3.2"
Choose one range colder for 3.0" pulley use.
Choose two ranges colder for 2.8" and below pulley sizes.
.033 gap

 

two heat ranges colder for an sc car is rubbish. I run the BKR7EIX on a 300 whp tvs

________________________________________
NGK BKR6ES *STOCK heat range* <-- STOCK Plug

NGK BKR6E "V-Power" *STOCK heat range*
12610767 4106 AC Delco
NGK BKR6EGP Platinum Plug *STOCK heat range* BKR6EGP NGK G power Platinum alloy stock heat range stock # 7092

NGK PFR6T-10G "Laser" Platinum *STOCK heat range* race plug

NGK BKR6EIX Iridium *STOCK heat range*


Autolite 3922 Copper Plug *One Range Colder*

NGK BK7RE Copper Plug *One Range Colder*

NGK BKR7E Iridium Plug *One Range Colder*



BKR7EIX NGK IRIDIUM one heat range colder stock # 6664 14 BUX Each in Canada

BKR7E NGK REGULAR V POWER? Stock number #6097 says to use 4644
Cheaper $

NGK BKR8E Iridium Plug *Two Ranges Colder*
NGK BKR9E Iridium Plug *Three Ranges Colder*

Denso Iridium IK24 *Two Ranges Colder*
Denso Iridium IK27 *Three Ranges Colder*


Stock Gap is 0.45"



NGK Automotive OE Replacement Parts - In Stock for Your Tune-Up!

 

Just bought the NGK V-Power 1 step colder from ZZP's site. I have/will have your similar mods. I came to the conclusion after many searches, 1 step colder is fine.

Also what he said ^ x2

 

The general rule of spark plugs is that you need 1 step colder for every 100hp you are adding to stock.

I run a 2.7 with BKR7E which are 1 step colder, no problems.

 

iridium is garbage stay away

 

This. I run the same plug.

Tried the coppers, and my car did not like them.

 

at the .045 'stock' gap?? im on the ngkbkr7eix's too but i gapped em to .32 and i get a bit of misfire

 

No. That gap listed is wrong.

My gap is set at 0.031"

Stock for the LSJ in the owners manual claims 0.039".

My cars stock plug gap from the factory was set at 0.035". I don't get where that 0.045" gap came from.

 

i was hoping it was wrong!

 

Lol@Mr.B. My garbage has lasted for years: Two sets of iridium spark plugs since 2008 and the TVS. Before that with Meth and an M62 I ran stock plugs

 

I got iridium and she runs rich and shitty haha that's why I might go with one step colder, so is it adviced with my mods?

 

The car isnt running that way because u have iridium plugs. You need to take a look at your tune. One step colder plugs are not going to lean out your tune.

One step colder plugs will be fine for your mods.

 

I have always wondered, how do the SS/TC stock plugs compare to the SS/SC plug heat ranges?

 

No idea. Stock heat range plug for the SS/SC is a 6.

One step colder is a 7.

Not sure about SS/TC plugs.

 

I should have searched

SS/TC
"The OEM plug is a ILTR5D. This is a 5 heat range plug."

So how is that SS/TC plugs run a different heat range with more boost and HP? Sorry for the newb questions.

 

I don't believe IAT2's on a turbo setup get as hot as IAT2's on a blower setup.

That could be one of the reasons.

 

Copper Spark Plugs vs. Iridium and Platinum: Understand for Top Performance - CarsDirect

Many people come to the point where they are forced to change the spark plugs on their vehicle and face a difficult decision; copper spark plugs or those of another type? You can find spark plugs in a variety of different metal combinations, including aluminum spark plugs, iridium plugs, platinum and more. Copper core spark plugs are still the most commonly seen, however, and many people agree that they are the best. However, the advertising that accompanies the different types of spark plugs is potentially misleading, so it's important to recognize the real difference between the spark plugs in question. In order to do that, it's necessary to first learn about what the metal in the spark plug is used for.

Purpose of the Metal

The metal in a spark plug serves a single basic purpose: to channel the electric energy from the plug wire through the spark plug so that it can be forced to the engine block in the form of a spark. Therefore, any metal that conducts electricity at all could potentially be used for a spark plug. The metal should also not get too hot; one of the main problems with some metals is that they overheat quickly, causing the electric charge itself to be compromised and the spark plug to not operate as smoothly.

Copper Spark Plugs

Copper spark plugs are generally considered to have the best performance of any spark plug type. This is potentially different from what advertising companies suggest, but the other metals are, unfortunately, not as conductive in general as copper is. Platinum and iridium plugs are more likely to overheat, which causes damage to the plug components and can compromise the delivery of the spark to the engine block.

Platinum and Iridium Plugs

Platinum and Iridium plugs perform at a lower level than copper spark plugs, because they are less conductive and they tend to overheat. However, the overall longevity of these two types of metal is better than copper plugs. In reality, copper has the best performance of all three and the worst longevity. Platinum has good longevity and the worst performance. Iridium has good longevity and a performance that is decent, which is why iridium plugs tend to be more expensive than any other type. Still, the difference between these plugs in terms of overall quality is minimal, as there is a trade off for each.

Most copper plugs need to be changed every 20,000 miles or so. Platinum and iridium plugs can often go for twice that before they require changing, but the overall performance will not be as good and you may have to deal with overheating of the plugs. This is potentially not worth the added cost of both platinum and iridium spark plugs, although the decision will depend upon your preference.

If you have any other questions about spark plugs and which are right for your vehicle, consult with a mechanic for more advice.

 

Best one step colder plugs then?

 

What? The book says .045....the factory gaps them at .039 and your car likes .031.

Soooo..... I need one range cooler in a copper plug that I gap at....?????

Or if I want to fool with Iridium, they are not supposed to be gapped because they are fragile. Hopefully the gap is between .031 and .045 on the Iiridium right out of the box.

The steel coil is screwed directly down to the aluminum head. Between the two mine had a bit of rust and corrosion. This is a ground connection for the coil so I'm gonna clean the bottom of the coil and the block boss so my ground is perfect. It can't hurt.

 

I'm at 0.031" because I flow a good deal more air than a stock car.

You want the largest gap possible w/o spark blowout.

That's crap about not being able to gap iridium. They can be gapped no problem. I've gapped many sets. You just need to be extra careful.

0.045" is too large of a gap even for a stock SS/SC. You will get spark blowout when you go wot for sure.

Best 1 step colder copper plug is BKR7E's

Best 1 step colder iridium plug is BKR7EIX.

Choose the one you prefer.

 

It seems like LSJs are split 50/50 if they like copper or not.

Mine hates iridium and only likes copper.

 

Just put in a different plug in each cylinder. See which misfires the least and stick with that plug.... KIDDDINGGG, don't do that. I'm not responsible for engine damage.

 

This whole deal is interesting. The spark plug info came off this site. The statement "
My car hates iridiums" is silly Whitnith your car tune last time I saw it was so rich it coulda been a diesel. I run iridiums like I said stock gap which is prolly .035 or so. For most folks the OEM Plug is best for LSJ to stage two or even GM stage 3. My .02 cents. GM put a ton if effort in the spark plug for this LSJ motor; the LNF which has a different plug altogether but there ZZP who know as much or more than anyone about
These motors say for LNF use a STOCK PLUG for a
Motor up to 500 whp

 

What should I gap one step colder copper plugs?