High Compression Ratio ----> Detonation

[GTRJazz]

jondee86 Wrote:Yes... interesting thread

BCPR6EY11... fairly certain these are the OEM "shopping basket" plugs.
I would be running at least one heat range colder.

Cheers... jondee86

My 4AGE is 131bhp at the wheels and I find these plugs work well in that I also have some NGK Iridium 8s but they are too cold.

[jondee86]

The heat range used should be chosen to suit the type of driving
you do. For everyday round town running the stock plug is most suitable
to avoid plug fouling. But for prolonged high speed/high load operation,
a colder plug will be better.

I would put in one heat range colder plugs when racing my car (stock
engine). For modified engines with increased power output, a colder plug
may be required for "spirited driving". But there will be an increased
risk of fouling if the same car gets caught up in city traffic.

Cheers... jondee86