NGK Iridium IX vs Denso Iridium Power - What's the difference?

In my opinion Denso is #1 and NGK#2. No other plugs come close. There is a Denso long life Iridium which has a slighter thicker center electrode than the Iridium power spark plugs. I first tried the Denso iridiums in my 1984 Toyota Supra. I had been using the standard Denso U grove plugs and they were in average condition. When I put the Denso Iridium power plugs in, the difference was like night and day. The throttle response became razor sharp like a race car. My jaw hit the ground, I couldn't believe the change. I have yet to try the new TT Iridium/Platinum. Can't wait to try them. I highly recommend giving them a try no matter what car you have.

IMO they're both fine, high quality plugs and you can just run which ever of the two is cheaper with no problems.

NGK for racing perfomance. DENSO daily life family affordable.

The denzo Iridiums are supposed to have the smallest center electrode of any plug thereby giving you the fastest throttle response. From my experience I believe it.

Just an advise, shoot your videos on 24/30 fps under fluorescent light to prevent flickers

denso is manufacturer centric and NGK is customer centric; that is why most of the automobile manufacturers (mostly japanese) uses denso stuffs and buying denso from the the market is different in quality. Once the plugs that came with the car are done, i recommend to go for NGK...

I just replaced my NGK Platinum plugs for Denso iridium plugs in my Acura . Change the coil packs also. Car runs great a lot more horsepower runs a lot quieter fuel mileage excellent.

You got some good points in there. But, high boost application increases the pressure and heat. An oil cooler, dry sump, electric radiator fan, water cooling could only do so much. A colder spark plug is definitely more friendlier for high boost, high compression applications.

Thanks for posting this vid ...my mechanic took off my Ngk iridium plugs that hasn't been changed for over 50k miles and we're still Perfect and replaced them with Bosch Platinum 😥😥😥...now I 've to keep changing down to accelerate to avoid mild misfire. ..used to cruise at 40mph..2k on rev counter in 6th...now I ve to stay in 5th at same speed to avoid mild misfire...buying NGK iridium 2mrrw and swapping ASAP..

ran ngk in my 2 strokes and scooter for 35 years.champion in my dodges.

Standard range plugs from NGK Denso and all the rest have a nickel alloy centre electrode (2.5mm), after that is the platinum centre electrode usually 1.1mm...and then top of the range Iridium/Rhodium centre elctrode 0.4-0.7mm

5:05 "I would say the NGK is a more rugged plug". you have that 1000% correct. so I have a high performance motorcycle that needed a Iridium plug . both NGK and Denso made a plug for this model. exact heat range everything. it had an NGK in it from factory when I bought it and it was fine no issues. Well I was replacing a faulty coil, and coolant flush as it was getting to 15 years old this bike. so I decided to do plugs as well as you have to drop the radiator to do it (hence why iridium is the best option for bikes) so I order some NGK's however they call me back and say they are in back order due to Covid. but we have the identical denso. So I bought them. Installed and running perfect. I start to ride around. all good no issues. however after a few days. after the bike had been ideling at traffic light I started noticing the ideal would start to go funny. and when I would take off you would get that classic plug breaking down from heat. once you go moving and cooled the bike a bit it was fine. but you could tell the tell tale sign the plug was unhappy. I tried to get a 8 range heat rating but they don't make them only a 9 to 4 billion. funny they wont go to a hotter range after a 9 (both denso and NGK) anyway I ended up returning these and getting the NGK's back in there. and guess what. no issues ever again. so I would say you are right the NGK's are just more robust. where the denso perform like a more high performance colder plug. I also found out recently Bosche make a plug that suits my bike. now its getting interesting. because a lot of race teams in certain categories state the bosche is even better a not breaking down and handling heat but giving max performance even over NGK's so ill be keeping an eye out for that

Keep the video steady man!

I prefer NGK over all

Until today, I ran the originalNGK Iridium plugs....217,560 Miles !!!! When pulled...They still looked good, but degraded some. Because the plugs were in for soooo loooong, I was really afraid of galling the threads...got lucky...all went well.

Denso has a global patent on the small .4mm tip. Other the other mfg need to build with a larger tip as such. NGK is .8mm tip. That small tip is the key as your system needs as little as possible to ignite it.

both are well made....can't go wrong

hasta la vista, baby !

I use Denso iridium spark plugs on my Harley best performance plugs ever..

Just make it short and simple! Which one is better???