Hi mark, all is OK at this end. busy as usual.family fine.
I have the plugs in stock for the non-turbo 3SG. same price etc.
their major advantages we have found are.....
**the electrode is made from a precious metal (iridium alloy)that does not erode quickly. therefore plug gap remains constant over many years, not just months.
**because of the electrode sizes and shape, the spark jumps more readily. this means it can work effectively with lower voltages.
**they dont tend to fowl as easily as stock type plugs. this is really important in up-boosted turbo cars which might be running a bit rich down low, say from oversized injectors
Denso make various claims about increased economy and power ,the gains are so small, I have to wonder if they are within the bounds of experimental errors. Whilst some owners report decreased fuel consumption, much of this could be just due to new plugs, rather than these Iridium ones.
In any case, most quality (conventional) plugs are "dead" by 20,000km, and the engine goes off quite quickly after about 10,000km . Anything that helps this, is a good thing. If you are paying to have plugs changed, then these Iridium ones make economic sense.