best spark plus for track days..?

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dph500
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Post Sat Feb 28, 2009 9:05 pm

e30 325i, used just for track days. Which spark plugs are best? Does it really matter? Waht do he racing guys use?
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kimbo
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Post Sun Mar 01, 2009 9:45 am

If the motor is standard, then I'd use standard plugs under most circumstances.
If you're running for a long time at full chat on a hot day, then you could go one range colder (i.e. higher number on plug IIRC) but this may cause fouling on cold days / low revs.
Just look at the plugs after a run and as long as they're not scorched white on the electrode, it's OK.
If it aint broke - don't fix it! :)

Kim.