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Spark plugs to suit boost 

 

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 Post subject: Spark plugs to suit boost
Posted: Mon Aug 06, 2007 1:18 pm 
Getting Side Ways
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i have been doing some reading and talking to some people regarding plug that are suited for turbocharged applications. i currently run the NGK platinum BPR5EP-11s in my straight gas 250 with a 0.85 gap set for gas as recommended by a gas tuner. overall i am very pleased with their performance. in regards to boosting a car i have been told that you should run a colder plug, in the case of ngk a 6 or 7 for higher boost leves which makes scense but i was also told that you should run a resistorless plug? why? also i it recommended to run a smaller gap such as 0.85 for turbocharged engines?
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Posted: Mon Aug 06, 2007 1:38 pm 
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zgr6b-11's seem 2 work fine

 

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Posted: Mon Aug 06, 2007 1:57 pm 
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I had the standard plugs in for my first tune after the car was turbo'd and there were no problems up till about 12-13psi, then the car started to misfire. The tuner fitted LPG plugs with a 0.8 gap and no more misfire, and the car has seen 20psi.
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Posted: Mon Aug 06, 2007 2:14 pm 
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I've got denso plugs with a 0.6mm gap atm.
But i'm on LPG too.

 

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Posted: Mon Aug 06, 2007 9:59 pm 
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Two things required .. Close gap on plug as boost rises.. And fit colder plug for every 100 h.p.. Unless low comp pistons are fitted...
An MSD / Crane system helps....

 

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Posted: Mon Aug 06, 2007 9:59 pm 
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i run zgr6b-11 gapped to .80. they work great.

 

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Posted: Mon Aug 06, 2007 10:29 pm 
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thanks guys, what about the resistorless aspect?
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