I use denso's in all my cars, rate them all the way, the hks ones are exactly the same but with hks written on them! Its not normally the plugs fault it lets go, normally badly set up car or wrong choice of plug temp!
NGK`s all the way for me. The only Denso`s I run are in my lawnmower
I have had denso`s fail on me and have replaced them with NGK (same heatrange) and had no problems. For this reason I only use NGK and the only ones I have seen fail are when the wrong heatrange has been used.
Try this site for cross reference data etc..from NGK no less!
I would never use Denso again after a number of bad experiences, and all the comparisons were fair. On a number of cars and one motorcycle I've had Denso's fail, not necessarily catastrophic but ruddy inconvenient at best.
In all cases plugs were ABSOLUTELY correct for purpose and virtually new, the one in the motorcycle had less than 1 hour usage when it failed.
I still have some of the failed plugs if Denso would like to comment..in the case of the motorcycle plug it looks perfect but stopped firing. No problem there except I was halfway over a mountain in Spain at the time. Fortunately a local farmer removed the plug from an old moped and that got me home, though looking at that plug I didn't expect it to fire either!
I do not accept it's coincidence that several plugs which failed during the last few years were Denso's, none of the NGK's have failed in the same period, be they standard copper, Platignum or Iridium.
I cannot curse Denso enough for the agravation their plugs have caused me, and will continue to take every opportunity to tell anyone who'll listen how bad they have been for me.
would coppers be ok in a stage one r33 gtst or does it have to be Iridium as i know lots of higher powered turbo cars running coppers and don't have problems so is this a skyline snobery or a must have to use Iridium?
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