At what point does the IX diverter valve needs to be changed for a better one does anyone know I am just curious I have done a few 340-370hp evos which seem to be holding up but on a GT35r kit at 18 psi it would start to open we changed it and it made more power.
So has anyone changed theirs @ 330-350hp and seen a gain in hp or more stable boost curve

 

i thought the 9/jdm mr bov's help 25psi perfect. i thought there was no need to change it unless your boosting past 24 25 psi

 

It's not relevant to WHP - it's relevant to pressure. It is proven to be efficient up to 24-25psi, but I don't know why it would open at 18psi on a GT35R. I know 18psi on a GT35R is pushing way more air volume than a stock turbo at 25psi, but the BOV doesn't care - it's only based off the psi, not airflow.

 

Well we changed it on the dyno and picked up over 20whp on the big end. I don't know if it is the constant force of the larger turbo and the external wastegate the spring eventually just can't manage it or what but I am not guessing I saw it but just wondering about with the stock turbo.
Thanks for the input.

 

just keep the ix dv. its the best one for the evo.