Where would I find some assorted springs for this?

[2JZR31]

Where would I find a stiffer spring for this? This is my DIY ported GT35 internal gate. As pictured it held 10psi with the stock sized port (up from 4psi which is the stock actuator pressure), but with the additional surface area of the new flapper it is being blown open causing 500rpm extra lag. I just need any old spring that will fit and be stiffer than the one I have in there ATM.

Who would sell something like that? Brisbane Northside if possible.

[thechuckster]

mitre 10 and bunnings stores usually have a selection of springs - tho am not sure how they'd cope with the heat.

large auto parts stores that have all the rotating displays of bolts, nuts etc have some springs.

extrememotorsports at Toombul Rd Nundah? is close to you?


edit: best ghetto method of increasing wastegate spring pressure 11!!1!!!