kentuckyslider wrote:BKR7EIX NGk's if you are making less than 300whp, BKR8's if you are making 300-400whp and 15-20psi of boost, BKR9's if you are running over 20psi and more than 400whp. I run 8 heat range year round and have no problem.
240SXMOTORING.COM wrote:NGK Iridium IX Plug BKR8EIX *set of 4* - high HP applications
Set of 4,
2 steps colder spark plugs for SR20DET, KA24DE, CA18, all RB motors.
These are not recommended for daily use.
Use for High Horsepower cars that either run lots of boost or lots of timing!!!!
Helps lower combustion Temps.
So you're saying that if it's over 300hp then you should use 8s but 240sxmotoring.com states that they shouldn't be used for daily use.
*sorry for bumping an old thread...