fryman

Car: eg Civic
Engine: D15B JDM Vtec
ECU: P08

I had some standard Denso KJ16CR-L11 plugs in my car but the time came to buy new plugs so I went with the stock NGK V-power ZFR5J-11 plugs. I noticed a big decrease in acceleration and performance after switching to NGK.
I went to the auto parts store and gave the parts guy the part number for the Denso plugs and he comes back with Denso Double Platinum PKJ16CR-L11 plugs which he swears is the same as the KJ16CR-L11 plugs. I didn't remember paying $7 a spark plug with the old Denso plugs I had so I went home and checked online and it turns out the Denso plugs I had in my car were the standard $2.69 ones.

Since I saw such a performance difference between the Denso and NGK standard plugs it made me wonder if I would see a even bigger Increase if I put these plugs in.

So my question is should I stick with the Denso Double Platinum plugs or is it not worth it and better for me to go with the standard Denso plugs?

hyperblu

Here's the secret that nobody tells you. Just because it has 2-4 prongs, the spark will ONLY go to one (the closest one). Having more prongs will not improve performance. Period. Auto parts stores likes to offer those bogus plugs all the time.

fryman

Double platinum doesn't mean it has multiple ground electrodes, the plug I'm referring to only has one. Here's a picture:
http://ecx.images-amazon.com/images/...500_AA300_.jpg

cheggie

The double platinum plugs have a platinum plated electrode and a tiny spot of platinum on the ground strap. Honestly, they work just like a non platinum, the plating only serves to lengthen the life of the plug. If you look in NGK's catalog, platinum are the same heat range as a non platinum for a given application.

Also, electricity is lazy, it will follow the (singular) shortest path to ground. That's all I'm saying about that...

EJ8_Man

Did you gap the plugs correctly? I've never had any problems with my NGK plugs, in fact NGK is what tuners and Honda recommend.

jdmcivicracer89

get ngk vpowers and call it a day.. those 4 prong dont do anything but make ur pay more and car run worse

HondaPartsHero

I use the Denso GP platinum series, 3 dollars a plug instead of the $2 NGK coppers. Works just as well.