I'm currently running the Large Yellow spring, which is .7bar (11.6psi) spring, and running 25psi. At about 19-20 psi the boost starts to bounce and fluctuate +/- 5psi really fast and then finally levels off at 25psi in the upper rpms.

Initially i thought it might be compressor surge, but now i suspect it might be the wastegate spring. Ive actually got a 1bar spring ordered on the way, but i would like to know/confirm the symptoms from anyone with similar experience.

thanks!

 

what boost controller r u running? that could be ur problem

 

I'm running the turboxs dual stage. Whats everyone else using for 20+ psi thats not a EBC??

I'm not a big fan of EBC controlers, i just want to set it and forget about it.

 

what turbo/engine? i've run 20+ on 7psi springs with the turboxs

 

what size wastegate?

 

The setup is sohc/vitara, short tubular manifold, t3/t4 50trim, tial 38.

more info about the setup in the sig.