which one would you guys recommend for boost up to 20psi in a '94 LS?

thanx

 

my delta gate boost spikes at only 6 psi

 

is that the "Deltagate Mark II" you have?

 

get yourself a 40mm Tial

 

How much boost can the 35mm tial take?

 

you could use the 35mm upto about 400hp. Anything more then that you should be running a 40mm.

 

what spring does the 35 mm and 40 mm wastegate use?

 

You have your choice of springs. Most places stock only one or two spring rates but more are available. Here is what you can choose: .3bar, .4bar, .6bar, .8bar, .95bar, 1.1bar, 1.35bar, 1.5bar......those are for the 35mm wastegate. The choices for the 40mm wastegate are .3bar, .4bar, .6bar, .8bar, .9bar, 1.0bar, 1.1bar, 1.2bar, 1.3bar, 1.4bar, 1.5bar, 1.6bar.