i have 2 wastegate springs laying around, a small red one (8psi) spring and a big yellow (4 psi) spring, he told me if you put both of them in the wastegate that the 2 together would run about 12psi off the wastegate.. im not sure about combinding 2 springs but does anyone else know if this is true or not?

 

true. as long as you are combining a small spring and a large spring. you cannot use two smalls or two larges.

 

the red one fits right inside the yellow one

 

large yellow = 8.7 psi small red = 4.35 psi = about 13 psi

 

yes you can combine the spring, the pressure will equal the sum of the 2 springs. so in your case 12 psi.

are you sure of those spring pressures though? what kind of wastegate is it? generally the smaller springs are lower psi. here's a link to tial's spring chart http://www.tialsport.com/docum...p.pdf

 

the small red one was in my car for a while and boosted consistant 8psi off the wastegate.. i read on here that the large yellow was good for 4 4.5 psi.. its a tial 38mm wastegate

 

http://www.tialsport.com/docum...p.pdf