liquid_helix136

What exactly defines one step colder plugs? Are there a very specific brand of plugs that are like this? Or is it quite general? If im running NGK Platinum plugs are these considers 1SC plugs?

Sorry for noob question, search is down right now =\

Gernby

All spark plugs are designed for specific heat ranges. A "hot" plug has more insulation between the electrode and the threaded seat, so the normal operating temperature of the electrode will be higher. A colder plug will have less insulation, so it's normal operating temperature will be lower. The reason for the differences is that you want the tip of the plug to be just hot enough to burn off deposits, but cool enough to prevent pre-detonation (knock).

Honda uses a plug that works "good enough" for all climates, but you can get a bit better performance in some cases by using a colder plug. Basically, use the coldest plug that won't foul out. I use the NGK BKR8E-11, which is copper, and I plan to change it every 5K miles.

liquid_helix136

wow changing plugs every 5k miles!
My reasoning for wanting to switch is because I just bought a pretuned GEMU and for more aggressive setings, requires cooling mods and one is a one step colder plug, I am running NGK Platinums but I am not sure the part # of it. I'll probably just swap to the iridium plug they are talking about in the other thred, just to be safe

Gernby

If you bought a GEMU that was tuned for another car, then you really need to start over with a tune for your car. Every car is different, even if they have similar mods.

If you are going to do cooling mods, stay away from the colder thermostats and fan switches. They do more harm than good. In fact, since you have an AP1, you would probably benefit from a hotter thermoastat, like the ones in the late model AP2's.