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WydRyd WydRyd is offline
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Join Date: Mar 2002
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DPO's are Platinum plugs and have a longer lifespan than the CS's. The DPO's also fire more reliably on stock ignitions at higher than stock boost levels, but since I run a CDI, that's not really an issue for me. W3CS would work fine on a stock motor at stock boost levels. Certainly a cheaper alternative to the DPO's, at the same heat range as recommended by the factory.

I suspect the factory specified a 3 heat range because they knew their customers would be thrashing their cars on/off the track, so they wanted the extra insurance of running a colder plug.

At the end of the day, cost was the factor for me. I was quoted AUD$50 for each DPO plug , whereas I sourced the W3CS's for USD$2ea NEW So I purchased a dozen of them. Might pick up another 18 or so and just have them as spares, since I typically change my spark plugs every 5,000-7500km's.

EDIT: I know a warmer plug will stay cleaner longer, but I'm not risking pinging/detonation in my motor, especially at the boost levels I run. $50 on a set of plugs every 7,500k's is more cost effective than an engine rebuild
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition

Last edited by WydRyd; 04-11-2007 at 06:27 PM..
Old 04-11-2007, 06:22 PM
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