Actuator Preload

[Barks]

Hello guys, how many turns of the actuator nut do you guys do to add actuator preload after the wastegate is closed? A quick search on the net say between 3mm - 5mm or 3 turns?? Cheers

 

[<tuffty/>]

Depends on the actuator... on some of Dans 1bar actuators 1/2 a turn is enough... 3 turns is the generic preload but ideally you would use a mitivac to test the crack pressure

<tuffty/>

 

[Barks]

Cheers tuffy, I will start with 1/2 a turn then go from there

 

[russwuss]

Sorry to jump on this...


How would I know if preload is correct?

I just copied where the nuts was on my std k04 actuator on the 15psi one for bbt. Boost gauge indicates about 12psi with no n75?

 

[Barks]

I would expect the actuator to hold boost of the actuator rating(ish).. Maybe not enough preload, or of course the boost gauge could be reading incorrectly, Cross reference to vagcom would prove that though... Someone will correct me now!

 

[<tuffty/>]

Rating is dependent on preload... so you are correct, a little more preload is required in this case...

<tuffty/>

 

[russwuss]

thanks! will do some more investigation