Those are mine. I did those with MPGMike's and Automotivebreaths input.cawcislo said:I found another page from a turbo daytona guy. Read on....Scott's 88 Turbo II Daytona Shelby Z
He did the groves....
Right now I'm having heat issues EGT's 1650. I'd love to cut grind a couple groves in my head and see the results but I don't want to do it to a $600 head.
scott_s said:Those are mine. I did those with MPGMike's and Automotivebreaths input.
Looking at them now, I think I could of gone closer to the edge. My EGT probe died. Can not really remeber what the EGTs were exactly, but they were lower than what most report. Rember that much. 13-1400ish.
You should check out turbobricks.com. They have a couple of good threads on grooves and turbos. TM has a thread in the 16v conversion that has some con type comments. Just to see both sides.
Talking to Automotivebreath recently, he suggested 4 grooves angled to the exhaust. Very much like one of his other pics posted somewhere that has 3 grooves.