I have a Tial 38mm wastegate with .3bar spring (4.35psi) and using Utec BCS to control boost. I have one map which give me around 4.5psi in of of my Map running on wastegate spring and an 8psi map. I seem not to hold boost past 5700rpm and it drops to 6.8-7.2psi by redline. I'm planning to upgrade my spring to a .4bar or .5 bar which will give me 5.8 psi to 7.3 psi respectively. I'm thinking of getting the .5bar spring and I want to boost around 8psi but not sure if Utec BCS can reliably control a .7psi increase. I did some reading and found out that BC can control 1-3 psi increase better. Should I go with the .4bar spring instead?

 

wastegate pressure for me is 12 psi

 

/\ I saw the Thread MRC created about your car. So you are running wastegate spring and no Boost controller? I wanted to run the .5bar spring since it will be stiffer and might help me boost sooner but I just want to run 8-8.5psi and not sure if utec can control that small increment. Ahsmo has the .4bar spring and he has the EVC6 and at 7psi he get a spike but at 8psi it is solid. I might endup just getting the .4bar spring have utec add the extra 2psi I need to hit 8psi.

 

Sounds fine to me. On my stock motor setup I ran a 8-8.5psi spring with the Blitz SBC and it was able to regulate boost to 9-9.1psi.

 

F it... I just ordred the .5 bar spring and hope for the best

 

hahaha

 

I run alot more than 12psi. That was just my lie to the world dyno in the beginning. As far as a boost controller I have an evc6 i usually spike 1.2 over whatever I set it at. My low boost right now is 13.3 and high boost is 16.7. Thats where I set it

 

I think you will be fine.