Roosie

iTrader: (8)

ok i see a actuator earlier which was marked 12psi then i looked at mine and its marked 16psi

why all different marking i thought 16psi would be a -31?

there all cossie actuators

Billabong

-31 & -34 are a part of the Garrett part number.

If an actuator has a PSI marking on it, then that's probably the base lift off pressure.

Roosie

iTrader: (8)

so does that mean these are std actuaters bar the one that says -31

this one with 16psi came off a t34 turbo also

Billabong

A std Cosworth actuator has a base lift off pressure of about 4psi, max boost pressure of approx 8-10psi gained by using the amal valve.

Roosie

iTrader: (8)

so if i ran no amal valve with a actuator thats marked 16psi then it will open up a 16psi? so that would be its max without a amal valve or bleed valve?

Roosie

iTrader: (8)

this 16psi spring is fooking strong can only just move it

Billabong

Yep, if it's in fine fettle. I wouldn't put it on unless yours is chipped though, and even then I'd prefer a proper Garrett -31 and correctly jetted amal valve. Personally, I prefer the ECU to have some control over the boost levels.

GARETH T

pump it up

Billabong

Pump, pump, pump it up! Sure there's a song in there somewhere, Gareth .