Something In my #5 Cylinder?

Walker434 said

These are CP Carrillo forged Boost spec pistons. Was running 27* of timing during drag week. When I saw signs of detonation I dropped that back to 23*. It seems very happy at 23*. I think I was also running too hot of plugs? During drag week I ran NGK BKRE6-11 plugs which is a 6 heat range. I have since dropped back to a 7 heat range NGK... should I go colder when it all goes back together?

Click to expand...

A piston manufacturer doesn’t matter as much or forged or hypers, if the ring gaps butted together. Butting them up on boost is a common issue around the forums.

I’m glad you run water/meth, what ratio?

In my opinion, your timing was way too high at 27. That’s less than 1 degree of timing per psi of map. If you experienced detonation, you may have damaged it then. Detonation is a wild animal under boost.