The OEM plugs are excellent quality, but their heat range is a little hot for high performance use, especially in warm climates. That would be the only thing that would really make sense for your friend to say about them.

 

Hmmm...i will check what the number on them are and PM your gern.

 

Wait those are ur only mods. Bc I think I'm a bit more modded and my stockies are great.

Gernby wait so colder plugs are better??

 

Champions???? those are the crappiest cheapest plugs and should never go into any Japanese cars. please stick with NGK or Denso. i seen too many toyota's come in with non oem plugs with misfire. im sorry but i dont think your friend knows much bout jap cars.

please tell me how your friend knows that at 6300 rpms that the plugs are not holding up? what type of scanner is he using or he just guessing by looking at your plugs or was it the butt dyno

anybody can mod cars. doesnt mean they are experts. look at how many tuners think they know how to tune cars to find out their customer blew up their engines. most tuners dont look at much but high hp numbers without considering the dangers they are putting on the engine

 

It was on a dyno,and like i said the guy is partial owner of a classic car resotartion shop, car care is his middle name...
And i have read a bunch of fine reviews of Champions...but i was supposed to get NGK anyway but they were stolen so i just got what they had at the moment.

 

Denso or NGK. Champions are from personal evaluation

 

Colder plugs allow for more aggressive timing when tuning. My roommates rule of thumb is if you're making 20% more power to the fly, you should be getting at least a step colder. Not that you can't benefit them before that.

When I did a pull in 90 degree heat I saw where my stocks aren't quite cutting it. Don't get me wrong, they're fine... but when you're digging into the maps you can see where their limits are.

 

Even if you have a totally stock S2000, a colder plug may have benefits. Below is an ignition timing plot from my '08 S2000 (red) and my brother's totally stock '06 S2000 (blue). The upper lines are the actual timing advance (IGN) and the lower lines are the knock retard. Notice how the blue car has les total ignition advance and more knock retard? This is caused by the knock sensor picking up on what it thinks is knock. Both of these were done with a totally stock tune, so why would mine be knocking less? The 2 most likely reasons are that I have colder plugs, and the other is that maybe my brother was using bad gas. BTW, ignore the top chart (Knock Level). I'm talking about the lower chart.



Either way, the only down side to running a colder plug is that they are easier to fowl out. If you live in a cold climate and / or routinely make very short driving cycles that don't allow the engine to reach normal operating temp, then cold plugs can foul out. Hot plugs clean themselves up better, but they are more likely to cause knock, which will cause the ECU to retard timing (power loss). Honda uses the same plug for all S2000s regardless of whether they are going to Minnesota or SoCal, so they went with hotter plugs.

 

Gernby is the plug you metioned above a range colder and is it Iridium or Platinum.

Thanks Swiftoy

 

The NGK BKR8EIX is an Iridium plug that is 1 step colder than stock. The important thing to know about these plugs is that they are pre-gapped to .032", which is below spec. They need to be regapped to .040", which can be tricky without the right tool. They are very fragile, so be careful.