What is a good recommendation for a guy like me who has full bolt ons and is running leaner than stock?

 

For a N/A application, the OEM heat range will serve you best. If you want to experiment at all, try one heat range colder, as a lean running engine will run slightly hotter combustion chamber temperatures than otherwise. Removing that additional heat is essential. You may want to monitor your a/f ratio closely to be sure you're not too lean.

 

so which one would be the best for turbo IFR8H-11 (5068),

 

The 5068 would be a very good choice, IMO. It's an iridium, so it should give a long service life. It's one step colder than stock, so it should function very well.

 

thanks for the great info

 

You're very welcome.

 

OEM plugs

 

Great post about NGK plugs. I do have one comment/suggestion regarding your statement:

I don't think you can compare the IX-series to the IFR-series. The IX-series refers to NGK's Iridium IX line while the IFR is NGK's Laser Iridium, and IMO the IX is better in general.

I will personally be trying the BKR8EIX or Denso's IK24 on my FI app.
What gap are you FI guys running? I've heard .03" or .035". For NA, I think the pregapped .044" will suffice, but not sure for FI.

 

I got he IX one step colder, we shall see. dyno coming soon!

 

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