Wastegate Springs

[raheezy]

hey there

i'm deciding to get an external wastegate instead of an internal. i was thinking of getting a low psi spring for example about 5psi and then using a boost controller to turn it up when i need it. what confuses me is i read somewhere that a person got a low psi spring and just the exhaust pressure itself pushed the wastegate open so it stayed open the whole time.

could anyone let me know if this is what will happen if i get a 5psi spring.

thanks

[UncleBob]

depends on the waste gate, where its located and what boost you're running

It shouldn't leave it open, but it can cause the wastegate to flutter, which will soften the boost hit or move it up in the RPM range as far as when it hits full boost.

That being said, I usually set my waste gates at 8psi and use a boost controller to modify it from there, I've gone as high as 30psi (although that was on accident)

but its a little too complicated to say they will all react exactly the same