Garrett -34 Wastegate actuator

Saturday, November 4. 2006

Posted by 505turbo

Comments (0)
Trackbacks (0)

Garrett -34 wastegate actuator

While I was looking for an actuator to use, I had people telling me they were all the same, and that there was no way I could find one with a stiffer internal spring. So I start looking around, see pretty quickly find Garrett actuators with stiffer internal springs made for a Ford Sierra Cosworth RS, and even some aftermarket actuators with replaceable springs for adjusting just how much boost you want to run.

The two I was looking at were the Garrett -34, and -31. I couldn't find any official documentation on the differences between these actuators, so I decided to buy a used -34 from a fellow eBay'er from the UK, and test it for myself.

There is some discussion regarding these actuators here:
http://www.505turbo.com/forum/index.php?showtopic=389

The actuator showed up, and supposedly only had 200 miles on it or something, so I was really happy. This is supposed to be the stiffer of the 2, but just how stiff IS the spring?

To give you an idea, the actuator that comes on the 86-91 505 turbo engines lifts at 5psi (when I say lift, I mean the pressure when the rod starts to move out of the actuator body, and open the wastegate). After getting this actuator on the bench, I quickly learned it -lifted- at a MUCH higher pressure rate, 14psi! Now I'm still not exactly sure about the ratio between the initial wastegate opening and the manifold pressure. I'm guessing with this unit installed, the wastegate would be fully opened at around 16-19psi (minimum), which is more boost then I want to be running (for now at least).

I just bought a NEW Garrett -31 actuator from a shop in the UK, so we'll see how that compares. I'm imagining that one will be perfect, fingers crossed....

A few comparisons to show the differences between the Stock and -34 actuator
Garrett -34 wastegate actuator

Pressure testing....

More pictures....
Garrett -34 wastegate actuator

Trackbacks

Trackback specific URI for this entry

No Trackbacks

Comments

Display comments as (Linear | Threaded)

No comments

Add Comment

Name
Email
Homepage
In reply to
Comment	Enclosing asterisks marks text as bold (word), underscore are made via _word_. Standard emoticons like :-) and ;-) are converted to images. To prevent automated Bots from commentspamming, please enter the string you see in the image below in the appropriate input box. Your comment will only be submitted if the strings match. Please ensure that your browser supports and accepts cookies, or your comment cannot be verified correctly. Enter the string from the spam-prevention image above:
	Remember Information? Subscribe to this entry