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2004 Acura TSX CT-E Supercharger 8 psi 3.15" Pulley on Church Auto's ...

" FastLine Performance Hi Flow CAT from HeelToe Auto Stock OEM Exhaust Denso IK20 Spark Plugs (Stock) 04 Throttle body with Throttle Body ...

Accord EuroR CL1 Dyno 223hp

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Denso IK20 Iridium Spark Plug, Pack of 1

I just installed a set of these in my 2001 GL1800. I previously had NGK standard plugs with under 1,000 miles on them and AC Rapidfire plugs with 24,000 miles on them.

The AC Rapidfire plugs were my previous favorite, but it seems they are not the same plug anymore, having lost the serrated center electrode. The Rapidfires I had previously installed were the non-serrated type. They still provided faster starts than new NGK plugs, but not the improvement I had witnessed in other engines with the serrated Rapidfires.

The IK20s, which, in spite of the title and picture, are Iridium Power plugs, provided about a 1/2 second start time, where new NGKs gave a slightly longer than one second start, and the Rapidfires gave a slightly less than one second start. The engine is running smoother than with the 24,000 mile Rapidfires, but that is no suprise. I can’t tell if it is running smoother than with new Rapidfires, as the difference is negligable. That is the extent of my review so far, as I have not yet collected enough data to see if I get a fuel economy change, and the power difference is too negligable for me to tell.

The Iridium Power spark plug is good for 30,000 miles as per the Denso FAQ. If a 5% fuel economy gain is achieved, then the plugs will pay for themselves a couple of times in that time.

There is also a Denso Iridium Tough plug available, the VK20, which is supposed to give less of the benefits of the Iridium power, but last 60,000 miles while still giving improvements over conventional plugs.

This fits in 1999-2003 Toyota Sienna. Trick to replace the three spark plugs in the back is to remove the windsheld wipers and the plastic piece for intake air and rain water collector — a big piece from left to right.

After the spark plugs replaced, the engine runs smooth, starts faster. Since Iridium is very expensive, the tip is little — 0.4mm in size, so that it can spark easily. Denso’s web site says it has life 60,000 miles. Denso also developed one for Toyota and Lexus that has 0.7mm tip, that one can last 120,000 miles. 0.4mm has more precise ignition time, so that better fuel econemy.

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