I was wondering what plugs you guys spraying over 200HP are using in your LSx motors? I had TR6's but need to go colder in order to go over 200HP... We tried Autolite Racing plugs that are 3 steps colder and NGK's that are 2 steps colder but my car did not like them at all... it just died after launching within the 1st 60 feet... I have a timing tuner pulling timing, I wonder if this might be part of the problem...

Anyone have any ideas?

 

NGK BP7EFS is the equivalent to a TR7 if they made one, and NGK R5671A-8 are another step colder than the 7's, I had been usin the BP7EFS, but then switched to the R5671A-8's, they are a better nitrous plug, don't have a projected tip, and i'm sprayin 300+, so it's a little safer to have the 8's in there. I wouldn't drive the 8's around on motor though, you'll foul 'em, I run 6's on motor, was leavin the 7's in, but was foulin them a little and would have to get on it to clean 'em out every now and then. So I just put the 8's in before I go to the track.