I've got an external wg and a Profec spec II. I do use both the low and high setting using a steering wheel switch button Greddy sells.

I do this for low boost in 1st/2nd, and high for 3rd and up.

I want to: run 12psi in 1st/2nd gear and switch over to 32 for 3rd and up.

But I thought if you install a 12psi spring in the wg that the maximum boost you can run is double the spring pressure of 12, meaning 24?

Do I have that wrong? Or is it just a rule of thumb?

 

I have the same boost controller and get 14.5 psi in low and ~31psi in high. I guess that the Profec2 does double it and in some cases slightly more.

 

The solenoid does about 2.5 times the wastegate spring that is used.

Interesting how you're using the Low/High setting. I have the remote switch as well, and I never thought about using it like that..

 

It works great!

Traction in 1st/2nd around town and full power in 3rd gear and up. I'm not a fan of the traction control devices available to me, nor their price. I don't have the patience for a rear wheel vehicle speed sensor setup for boost control, nor the money/patience for boost by gear.

So it works easy enough.

Thanks for the reply, that answered my question perfectly. So for 32psi I would need 32/2.5 = 12.8 spring. So my 15psi spring I have laying around will work just fine.

Reason for issue is I put in a 7psi helper to the 15psi and didn't run a boost controller for a while. Realized I couldn't go below 22psi after adding the Profec and utilize it as a tool.

 

I have a profec B, which im sure is a similar solenoid. When I tuned my car I had a 5psi spring in my tial 44mm (small red) We were able to squeeze 18psi out of it. I have since put a big red (10 psi) spring in it and I have the profec b set to about 50% on high boost and it makes 18psi. NO creep whatsoever.