The stock turbo can spike as high as 29 psi. It can only maintain around 24-25 psi through the midrange though, and 23ish at redline.

 

I would not do over 24 PSI on the stock turbo. The shaft won’t live long. For the guy that is trying to hold boost up to 8000 RPM I am sorry but it will drop not matter what you do to 22~21 PSI (turbo limits and it has nothing to do with the MBC). You might want to consider the 10.5^2 hot side as it will help hold boost on higher RPM a bit more but nothing crazy.

 

i have mine tuned and with c16 i run 24 psi up to or close to redline it might taper to 23. but on pump 94 i go 20

 

Just checked Hallman website and could not find the heavier pro spring , where could you get this from ???

 

yes I have tried myself and it works wonders. I run a 110 octane here bc you can buy it at the gas station for 3.99 gallon. 23 to 24 should be fine on 100, just taper it down to 22 or so at redline, maybe 23. The car may pull timing hard up top. what type of fuel management do you have? thanks and Happy tuning!

 

to add to it, I think the best setting for you would be 20.5 to redline on 91 or 93 octane, 23psi tapering to 21 near redline on 100, and 25 tapering to 22 or so near redline with 110 or 116. Hope this helps.