View Single Post
Old 09-29-2019, 02:32 AM   #1
johnowow
Member
 
johnowow's Avatar
 
Join Date: Jul 2017
Drives: 2015 Scion FRS
Location: Carlsbad, CA
Posts: 24
Thanks: 16
Thanked 4 Times in 3 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Spark Plug Gapping Preference for Turbo Build

Before I get started, I just wanted to say I've already done my fare share of studying before coming down to actually typing this question out for the past hour or two to no avail - so sorry in advanced if there has already been a definite answer.

It's been a mixture of inconstant answers as to what the best measured gap is for the OEM spark plugs in a turbo charge application.

Build:
2015 FR-S changing spark plugs @ 68k (yes I know its a bit over due lol)
Speed By Design SBD500X turbo that gets around 10PSI max on boost.
Stock injectors with DW300C upgrade fuel pump tuned by Delicious.
Daily Driven - spirited driving - no track.
Bogged a bit once turbo's under boost at around 4k but never got down to the problem as it just went away over time?

So nothing too crazy with the build, pretty average for a turbo set up at best. I've read a mixture of either going colder on a different set of plugs, which I just ended up purchasing the OEM set since they were pretty ideal.

Some say .032" pregapped and leave it at that, while some others are vowing to tighten it due to possibility of blow out and ranges the measurements from .020 like the WRX, .022, .026, .031, etc.

Trying to not waste any more of your time but what gapping have you guys got good results with on a normal set up? Thanks again in advance for any question and I apoligize if this has been over asked since I haven't found a good thread.
johnowow is offline   Reply With Quote