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Old 05-11-2011, 07:59 PM   #1
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Join Date: Aug 2010
Location: Bay Area
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My Ride: X5, CT200h, CLK63 BS
HPF Guys, what plugs are you running?

So.. i'm having issues with the car running a bit rich, carbon build up on the plugs and eventually leading to what I believe to be high resistence and spark/ignition issues after about 1500mi.

What plugs are you guys running? I'm running the NGK Racing plugs, rated at a 10 for coldness.

Is it possible the plugs are just to cold and I should be running the Denso Iridium's that the 2.75/other guys are running, or do I just need to have my tune adjusted?

Here is a plug after 250mi or so w/no meth/race gas.. and almost no boosting:

Here they are after about 1500mi with plenty of boosting, race gas, 91, meth, etc..

At the point the plugs get to where they look like the above the car begins to misfire (feels just like traction control) at about 4krpm.

Last edited by MarcusLSB; 05-11-2011 at 08:01 PM.
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