When to swapp to one step colder plugs ?

[mikesubie13]

Hey everyone have a 05 lgt lmtd 5 spd with a stage one flash Cobb accessport. Other then that everything else is stock plan to add a k&n drop in filter and a Catless 3inch dp run the stage 2 flash . Wanted to know when should u be looking into a step colder plugs ? Also does anybody have part Numbers ? Thanks guys

[Burke25thID]

I read a post on nasioc . And was told you dont need to swap to a colder plug on a stage2 setup . However my tuner said any increase over 75 hp would be a good idea to but not a must . Im on a 20g and im on stock plugs still

[robinlsb]

Unless you track it, not needed.

[BAC5.2]

There's never a reason to swap to a colder plug.

[Th3Franz]

LFR7AIX, NGK #2309. They come pregapped properly to .032 in. Some of the stock heat range are not coming gapped properly to run higher boost (stay away from part numbers with -11 at the end).

If you are making 100+ HP over stock, a colder plug doesn't hurt. Add in the fact that it's gapped properly for higher boost, it's a good idea.

[JermTheElf]

It is a good safenet for avoiding detonation at Stage 3+ power levels. 350+ HP.

[BAC5.2]

A tune taking full advantage of a colder plug is not a tune suitable for a street car. A tune not taking advantage of a colder plug is leaving power on the table for no gain in safety.

 

Colder plugs are not a safety net, unless you want to be "safe" from a lazy tuner (and leave power on the table).

[acumenhokie]

Do I need a colder spark plugs? A rule of thumb is one heat range colder for every 75–100hp you increase. In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70°C to 100°C from the combustion chamber. The heat range numbers used by spark plug manufacturers are not universal, so a 10 heat range in Champion is not the same as a 10 heat range in NGK or in Autolite. When making the decision to change the heat range of your plugs, it is a wise idea to make changes in 1 heat range increments, checking all your plugs for suitability during your test. Vehicle modifications during the test phase of your plugs is not recommended as this may skew your results.

 

So really...do I need colder spark plugs? Probably not as in the end it won't make enough difference to be felt. But if you want the bling of saying you have iridium one step colder plugs and you enjoy the work, knock yourself out.

 

I went one step colder anyway when I swapped to a 20G turbo.

[Th3Franz]

A tune taking full advantage of a colder plug is not a tune suitable for a street car. A tune not taking advantage of a colder plug is leaving power on the table for no gain in safety.

 

Colder plugs are not a safety net, unless you want to be "safe" from a lazy tuner (and leave power on the table).

 

Have you found a source that sells stock temperature range NGK spark plugs guaranteed to have the proper gap instead of .040+?

[m sprank]

^ OEM. Otherwise, dont be lazy and check your 6619's. Set them to .028.

[BAC5.2]

^ OEM. Otherwise, dont be lazy and check your 6619's. Set them to .028.

 

This.

[mikesubie13]

Why use a .028 spark plug gap instead of the .40 ? Any benefits ?

[BAC5.2]

Why use a .028 spark plug gap instead of the .40 ? Any benefits ?

 

You mean .040, and the answer is simple. One gap is correct, and one isn't.

[mikesubie13]

M sprank states .028 ? So which is correct ?

[BAC5.2]

m sprank states .028 ? So which is correct ?

 

.028