Hi i was wondering which are the best spark plugs for FI? And also do i need a grounding kit for FI? If i do what brand is the best? Thanks alot.

 

Anyone

 

I would probably go with: NGK Iridium LFR6AIX-11

 

How about the denso or the greddy

 

+1 on the NGK

 

copper are best for FI, bigger spark. Although you will have to replace them more often.

 

so then the NGK are best

 

Go back and do a search of posts done by: Sharif I know he has answered this many times to include commenting on gap. Plus he is a GOOD source for the plugs!

 

ok thanks alot

 

yeah the NGKs Sharif sells are top notch... www.forgedinternals.com

 

Here you go: http://www.forgedinternals.com/store...cat=264&page=1

I have been very impressed with the Iridums for some time now. I actually just pulled a set out of my engine, after about 8000miles, and even with a decently rich tune, and a fair amount of abuse...they were nearly perfectly and spotless.

 

How about does DENSO supposely they are 2 step colder then stock are they better. Ive done my research but i havent encountered someone using them. Do you know of anyone or if they are good.

 

Densos are ok but you dont need two step colder plugs and NGKs are better.

 

i bought a lot of the LFR6AIX-11 from www.sparkplugs.com good price excellent service

 

Ok guys im going to go with the NGK thanks alot but what model of spark plug. Do i need the NGK racing cables or not necessary. And also is a grounding kit necessary or not. If so which is the best. Thanks alot.

 

Grounding kits are for bling, we can't use spark plug wires, the part number is on www.forgedinternals.com LFR6AX-11A or something like that...

 

thanks

 

Those running the iridiums, are you attempting to gap them at all for you FI apps? I personally prefer copper for FI, but run iridums on my other car.

 

Well stock gap is .044 but all the Iridiums I got were gapped to .039. I did gap them down to .035 for a while to see if it changed anything...it didn't. I would run copper if the plugs weren't such a b!tch to get to. I had to replace the copper plugs on my last car too often so I'm running Iridiums on this one.

 

I'm running the copper NGK's on my car (cheaper and said to be better for FI). The part number for them is LFR6A-11 and I got a box of 10 from www.rockauto.com