[RCBILL68]

What carrera highbank turn do I need for a 90 degree turn. I have 3 - 4x8 tables and want 3 highbank turns to make a high speed section 

[DPJ]

I think they all differ. Because of the different diameters, there might not be a way to do a 90 degree portion of one of them - because the way the track sections might be cut to form the turn.
I have the High Bank2 and you can use 3 sections to do 90 degrees, but be aware that the lead up to and exit out of the banks are usually 3 track pieces before being flat again.
   

[psuskeet]

I run a tri-ovel with 3 high bank 2-30 carrera turns, not quite 90 degrees.