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I agree and this is what NGK has to say...
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Posted by pmr (more from pmr) on Tue, 14 Nov 2000 10:23:33 Share Post by Email
In Reply to: Re: Splitfire spark plugs in turbo models?, Dean, Tue, 14 Nov 2000 09:35:19
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...about increased horsepower by changing spark plugs.

"A common misconception is that changing spark plugs will result in a large power increase. In most cases, removing even seriously worn out spark plugs will only result in very modest power gains, typically about 1-2% of total engine output. This could be even less for computer-controlled vehicles, primarily because most newer vehicles have more powerful ignition systems and the vehicle's computer can make adjustments so that vehicle operation seems smoother and more seamless.

Many people think that simply supplying more spark to the firing tip can and will combust more fuel. What they don't understand is that most newer cars' engines are so efficient that they are already burning all of the available fuel. Simply adding more spark voltage can't burn more fuel because there is no more fuel to burn.

When a stock or near-stock engine is given a fresh set of spark plugs, peak efficiency is restored. The power gains that come from this restored state of tune are usually minimal. Any company that tells you that their spark plug will provide significant gains in power in a stock or near-stock engine is making blanket statements that may not be supportable."

pmr
'99 9-3 Viggen (with NGK BCPR6ES-11 plugs gapped to 0.035")
'99 9-5 SE V6

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