Hi:
I'm looking to do mild modding soon, and while checking some mods such as the "screaming demon" coil pack & wires at Outmotoring, an issue regarding "cold" spark plugs arose. What are they meaning by that? What happens if you use "colder" spark plugs onto an unmodified car (stock pulley etc.) and viceversa?
Not familiar with that "performance info." I 've seen lots of threads into this issue, but none conclusive with a 15% pulley mod. My plans:
15% pulley
JCW CAI
JCW exhaust
Nothing else.
Should I go for them? Any help appreciated.

Thanks

 

When I had my 15% pulley installed (Webb) I asked about the colder plugs.
Was told they weren't much of a performance gain, (altitude here?). JCW plugs are one stage
colder than stock R53, but maybe most beneficial with whole JCW "kit" (heads,
pulley, intake, exhaust, tune)? However, I have been curious to try them with
the limited mods I have. Perhaps people with first hand knowledge will post their info.

 

It's about heat ranges. Too cold and the carbon foils the plug. Too hot and the tip melts.

The main reason for going one step colder is to help with detonation when you up the boost. The plug tip can get too hot and pre ignite the mixture causing knock.

The plugs are so easy to get to on the Mini, go a step colder and go do a WOT run. Then pull them and see what they look like.
There are plenty of sites online that can explain what to look for.

Also it’s not that the sparkplug changes the output. A colder plug just means more heat is absorbed into the head and less heat with a hotter plug.

One step colder usually won’t effect anything.

This might help, http://www.briskusa.com/technical_02heatrange.htm

 

Thanks for the info and link ddawson!