I was having some stuttering/mis-firing at high boost on the spark plugs so I switched to the NGK BKR7E with a .028 gap. Right away I noticed a huge improvement but I can't help but feel it could be better.
I've been running these Denso's for almost a year now, seems to be a good plug for the price! :thumbup:
From my own experiences the raceplugs seem to help with misfire happy maps.
Been using the ngk ones for 10K km so far and they work just like oem, no problems, no misfires.
The racing plugs from NGK are exceptionally expensive, their standard Iridium plug is great as well. I wouldn't spend the money on the racing plug... I've tracked my car with the standard Iridium plug extensively and had no issues with plug wear etc. I personally feel that the racing plug is just taking more money out of your pocket for no gain/return.
I currently have them installed and gapped at .025. I don't know if they're making a difference or not but the car is running great so I haven't bothered switching back to stock.
I've personally ran these plugs in my car with 40+ psi of boost and lots of ethanol for the past 5 years. Great plugs!
I am getting better MPG,but It seems a little lacking in the power dept. compared to the autolite copper I had in?!Especially as far as low end torque.
For the OEM Bosch plugs, I would check them every 10k-15k miles at a minimum, based on what my stock plugs looked like @ 19k miles (sh!t).
At this point it's only showing symptoms after idling for 30 seconds or more (and even then not every time), like while waiting at a stop light. Only in first gear, second and beyond have no hesitation. This evening I swapped out the almost new Denso plugs (correct gap) and the problem seems absent.
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