Ive read on a few different articles that using a 2 step colder plug when going turbo is good, and you should gap it .0005 higher than factory specs because at a higher psi levels, you can blow through the gap. Is this true or do you all use the factory specs for your plugs when going turbo?

 

i actually closed my gap some

bkr7e-11 ngk plugs

2 steps colder

 

Depending on how much boost and cfm rating of your turbo depends on the size gap you run and which heat range plug will work well.

Usually on a mid size turbo 400-500cfm under 14.7 psi you can run 1-2 step colder, gapped around .030-.035" on stock ignition system.

For example, my setup is rated at 600cfm at 14.7. I run 22-24psi on 2 step colder gapped to .023 on stock ignition. Reason is because the spark isn't strong enough to det at a larger gap under so much boost.

Now if your running msd ign, you can increase gap size due to higher discharge.