vs
Spark plug Autolite or Denso
i run autolite 63 (gap to 24 thousandths) on my stage 4 for 500 miles with nitrous, they look perfect. 99 cents each. to each his own.
Pros: look perfect, work great
Mileage: 800 km
Part number: 63
It has been satisfactorily argued that the inexpensive Autolites work as well as the expensive Iridiums, with the understanding that the Autolites must be changed more often.
Pros: work as well
Cons: changed more often
I installed the Denso Iridium IK22's a couple of weekends ago, and i love them! They are 1 heat range colder than stock, i changed them out at 30k... The stock plugs were definitely gone, installation took 1hr. After i changed them out, the car ran tremendously smoother, and the car seemed more responsive all together.
Pros: tremendously smoother, more responsive
Mileage: 48280 km
After I replaced mk Denso Iridium IK22's with the bosch coppers the problem disappeared. It looked as if the electorodes on 2 of the Denso's were oddly eroded and were probably causing a misfire.
Pros: problem disappeared
Cons: electrodes oddly eroded
Part number: IK22
i just changed mine out.. i put in the autolite 3923's ($4 for the set) . they seem to work fine. one thing to watch out for though - they were all gapped differently out of the package. be sure to measure the gap before putting them in, just in case. (the gap should be .028)
Pros: seem to work fine
Cons: gapped differently
Vehicle:
Volkswagen Jetta
Part number: 3923
I was useing the Bosch +2's for about 4 months and switched them out for the Denso Iridium's, could definitely tell a difference.
Pros: noticeable difference
I have autolites, they work well, but the car became jerky at part throttle when gapped at .024, runs better when opened wider for some reason.
Pros: work well
Cons: car became jerky
don't feel like changing them every oil change like I did with the autolites that constantly misfired...
Cons: constantly misfired, frequent changes
i'm running autolites right now and i'm not too impressed with them
Cons: not too impressed
Just be careful with the Denso plugs. Denso has the gap specified incorrectly in the database so the gap is larger than they should be. It'll run but my cause to long term problems such as coilpack failure.
Cons: incorrect gap, coilpack failure risk
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