Engine: B5254: Turbo activator

[100K+]

Originally Posted by barrybritcher

what engine is it

2.5 V70 AWD R

Originally Posted by barrybritcher

BTW on the earlier t5 engine you could get away with setting it at the correct preload psi setting but my experience with the later types is to ignore that and use the official Volvo method.

this is for 2.4 T5 ...

apply 10psi to wastegate, the rod should move an average of 7mm outwards from the inital position. Release the air, it should move approx 7mm back.

Adjust the thimble until it is about 7mm travel.

When i set mine to preload of 4.5 psi as recommended i had boost issues. so I followed that method as per volvo and it was ok

1) Have seen the IPD video about preloading the actuator to 4.4psi, but I'm already at approx. 6psi

2) There is a long write up in VIDA which I think is similar to what you are saying, but involves a whole raft of Volvo special tool. - Will re-read and see how I can adapt in line with what you say.

3) But my lock nut is totally gone and needs replacing, so I need to disconnect the rod from the wastegate lever. The pin holding it to the rod appears to be hammered over. Can it be removed, or must I split the wastegate activator by unscrewing the thimble off the rod? ie leaving part of the activator rod attached to the wastegate lever and pin?

Thanks Barry for you help.. I was considering the 4.5psi option, glad you advised me out of that.


Cheers
Bob

[barrybritcher]

the turbo house side is deffo staked on and not easily removable. I would suggest marking the current position with tippex, nail polish, marker etc. (dont use sharpie these are useless) then undoing it all the way until rod is out.

yea im 100% sure the 4.5psi is the earlier high pressure models TD04 not the K24. (I set it to 4.5 and it ran like dog turd)

[100K+]

Have researched the Volvo method as described in Vida, and its a simple enough procedure.
An easier solution came from across the pond and involves disconnecting the TCV and doing a wide open throttle pull in 3rd gear to high revs.
This gives a "base boost" as it removes the TCV from the equation.
You can still do the 3rd gear pull with the TCV connected, but you will get a different result.

I also discovered that any pressure readings DICE give, include 1 bar of "normal atmospheric" pressure... That confused the heck out of my initial results


Cheers
Bob

[cheshired5]

Originally Posted by 100K+

any pressure readings DICE give, include 1 bar of "normal atmospheric" pressure

This is standard because it's a MAP sensor so it measures absolute pressure in the intake as opposed to boost pressure. The fact that many people call it a boost sensor (including Volvo sometimes) adds to the confusion.

With just ignition on, MAP or atmospheric pressure sensor should read around 1bar usually minus a few millibars to account for height above sea level or atmospheric conditions.

Actual boost is then the pressure on top of the ignition on baseline.