Would Like To Know The Best Spark Plugs That Will Deliver Mpg And Horsepower Performance For My Sahara 2008 Jk 3.8l V6. Have Read Many Articles On Bosch, Splitfire, E3.....etc. Does Anyone Have Advice And/or Experience With Different Brands?
I went into an Auto Zone store last weekend looking for a better plug for the same thing as you and I was told none of the high tech plugs were avaiable for them yet. He said the stock plug was a platinum plug. I'm still looking for a high tech plug also.
You guys are aware that the stock platinum plug is good for a ridiculous amount of miles, unlike plugs from years ago.
I used to work at O'Reilly's while I as in college. Splitfire is junk. Chrysler products usually run well with Champion plugs. Champion does make a platinum, which is probably what's in there right now.
Bosch Platinum is OK, but never, ever put them in an old engine that burns oil. They foul extremely easy.
Autolite Platinum and Autolite Double Platinum is good, although some people haven't really liked them in Dodge/Chrysler products.
Nippondenso Iridium is an excellent plug, particularly in Japanese and marine engines.
I don't know exactly what plugs are in the JK, but my experience has been that automobile manufacturers rebadge other brands and sell it as their own such Motorcraft plugs being the same as Autolite. One of the exceptions to this is AC Delco. AC Delco makes platinum plugs and is used as OEM equipment on many GM products. Most people report poor performance when using AC Delco plugs on Chrysler / Dodge products even though they are correct for the application.
In summary, changing plugs on such a low mileage JK is a waste of time and money. Keep in mind, this engine has one coil per plug, so it's already getting as good of a spark as it is going to get.
Not trying to be negative here, but just putting forth some useful information.
__________________ 2014 Copperhead Pearl Unlimited Sahara in progress
I'm running Hype-Tech 2000's with the unobtainium tips. Gas mileage is way up. Hp and torque through the roof. Funny that you can actually get more HP without burning more gas. Must be the plugs. It's a shame that Chrysler hasn't figured it out.
For the unobtainium ones to work, you need to introduce additional cooling, which you neglected to mention. I would suggest getting the ram air add-on to the AEV snorkel and run a direct bypass to the block to cool the plugs at speed.
x2 on the Champion platinums, years from now when you'll need to replace the stock ones. Splitfire is junk.
My bad, the cooling is fundamental. To help in that dept I have introduced the "Mr. Water Jet 500". If a little is good, more is better. A simple device inserted directly in to the Air Cleaner box, allows a stream of water to the intake system to cool down those hot plugs. Of course, the side benefit to all this is the splitting of the two hydrogen atoms from common H2O when the water hit the stainless steel tornado I installed.