I use NGK on my supercharged Roush. The recommended for supercharged engines is 28 to 30k miles. The only thing that you need to research with the e85 tune is whether or not you need a hot plug or a cooler plug. Roush calls for a cooler plug
I actually had a generator that would take 4-6 pulls to start with the "Torch" brand sparkplug, but starts in 1-2 pulls with an NGK.
BP7ES is what I have in my Wgen. Cranks 1st turn over everytime now since I switched and instead of rolling over 10-15 times with the crappy Torch plug now takes 1 second.
Quicker starts is a result...I just followed the crowd on this one and from my days at NAPA, i was a NGK and Bosch spark plug fan back then.
On my old Jeep Wrangler, the only plugs that it ran well on were NGKs.
Engine starts better and in some cases the engine runs smoother. The big issue now a days is getting a legit NGK instead of a Chinese knockoff.
NGK BP7ES replaced the torch that took 3 to 6 attempts to start on LP from large tank every time. Now starts on 1 try every time w the NGK.
I recently put in NGK LKAR7BIX-11S (93501) and some cheap amazon coils. A coil failed and I just replaced it all to be sure.
Put in NGK ILKAR7B11 (4912) around 186k miles. I've burned so much oil and did a piston soak at 205k~. I scrubbed the tips with a wire brush but it didn't do much. Lots of carbon. I really don't notice a difference.
I have installed brand new NGK sparkplugs and Bosh ignition coils...but the cylinder 1 misfire does not move or is resolved at all.
Get rid of those ASAP. These are prone to breaking their ground straps. Myself and many many others have fell victim to this.
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