I build most my engines with the Ih pistons and have pretty much concluded the ih pistons make a more sluggish take off. I have had other people agree with me too.
As far as drive pressure. I have 69/75 factory style turbos and am at 40 psi boost running 40 psi drive pressure. high rpm might be a different story but most people dont drive at 3500rpm all day.
What doe you guys think I should run for max timing for ih pistons? I,m thinking maybe -13 ? I feel like they just doen have as much power as the stock pistons. Also whats a good pw for 30% nozzle. Is 2400 too much? thanks