wastegate actuator ?

[wicked98gsx]

Ok so as stated in a few of my threads... I have a 14b CHRA mated to a 16g exhaust housing. Its as n eBay 16g housing a nd im also using the actuator from it. Well it has finally shit out on me and only getting to 5psi. I still have the WG actuator from the 14b and I want to install it. Problem im having is that from all the thread I've read... the actuators are supposed to be the same. Well the hole at the end of the 16g actuator that connects to the flapper is bigger the the hole on the 14b actuator and it won't fit! 1) is it safe to drill out the hole to fit and 2) what is the stock psi on a 14b (real mhi)? Im going to attempt to drill it out today but I just want to know what to expect. I read 11-12psi and some say 7-8psi. Just curious

 

[ronnievermilion]

I would put the drill bit that you are going to use over the hole and trace it with a fine tip sharpie.

Then use the mark as a idea if you think it will hold. I would probably go ahead and do it. Because of the fact that your running a crazy Frankenstein contraption.

Good luck

 

[gieri002]

The 14b wastegate is only rated for 8 psi. If you connect a hose from the j pipe to the wastegate, that is all you will see. However the BCS actually bleeds off boost to the wg so it opens later hence stock boost of 11-12 psi.

 

[Bud92gsx]

I'm using a ebay turbine housing and mhi 14b chra.You can mod the WG flapper to fit the 14b actuator.Or use the ebay one with the c clip.Drill and use cotter pin witht he mhi actuator, or again use the ebay turbine housing.

So that answers that.Now why your not seeing more boost,I'll leave that up to someone else

 

[97gsxIA]

Technically if you have a failing WG actuator you will see a boost "creep" not a boost "leak." This can be explained by taking a look at the actuator's function:

On a working WG actuator, boost will build, and as soon as it surpasses the spring tension in the actuator body, the arm will move and open the WG flapper open... creating an equilibrium.

On a non working actuator, boost cannot build pass the WG actuator spring's tension strength, thus the WG flapper is staying shut (or partially shut) and boost would still be technically building because it's not getting past the WG flapper, hence boost "Creep."

If you're not building boost you have a boost leak. Do a BLT and go from there.

You can research WG dynamics, but I find it pretty self explanatory. If anyone has anything to chime in here, feel free.