Check valve to stop wastegate creep.

[Ian S]

http://autospeed.com/cms/A_111348/article.html

http://autospeed.com/cms/A_111350/article.html

Some one here should give this a go and post the results here.

I'm not sure how the pressure regulator could work though. To me it seems it would just prevent the waste gate opening beyond a certain chosen pressure level thereby preventing boost control and so causing massive over boost and rapid engine failure.

I think they may be replacing where we have a bleed valve with that pressure regulator valve. I don't know really.

The check valve might be good though. (What they're calling the pressure relief valve)

It might need the reversed one valve though as it evidently doesn't allow the pressure after it to vent after the boost drops.

If inserted before you're normal bleed valve that might be enough as the bleed valve will still vent the pressure, but maybe too slowly, and not at all if the you close your bleed valve.

[Dave Reed]

That looks just like the one on my dad's cossy engine. Seems to work fine although very small adjustment is required to turn the boost up/down.

He's using it on a normal actuator/waste gate set-up.

[Mr_Dave]

I tried that exact setup about 7 years ago :) Works well actually. Like Dave says, its really sensitive to adjustment. Think the spring in mine was a bit strong really. The pressure regulator works just like a bleed valve to be honest, just that it gives a more consistant boost pressure. The important bit is the pressure release valve/check valve/crack valve or whatever you want to call it. Takes quite a bit of messing about to get it all setup ok tho.

Helps build the boost up really early and with low down torque and all that.

You can just use the PRV to adjust the boost on its own too. I'm just running a PRV and a bleed valve at the mo with the PRV is set to about 17psi. I only use the bleed valve when I'm in a rush ;)

Still got the valves kicking about somewhere. Guess I could put them back on and take some boost curve plots?

Edit! I've got a plot here, but I *think* its just a bleed valve and a PRV in this case: http://www.rtoc.org/boards/album.php?albumid=814&pictureid=8520

:)

[Ian S]

Wow, is it 7 years from the last time you and I 'talked' about it! I never did try them. You never did tell me the results of your experiments.

Did you use a reversed one way valve?

[Andrew Cooke]

I looked at doing that a few years back, in the end I just used my electronic boost controller as it does the same thing with less bits.

[raj]

I looked at doing that a few years back, in the end I just used my electronic boost controller as it does the same thing with less bits.

tell me more about your electronic boost controller? i may want to fit one pretty soon and would like to understand how these operate?

[Andrew Cooke]

tell me more about your electronic boost controller? i may want to fit one pretty soon and would like to understand how these operate?

fundamentally they stop the wastegate seeing boost until it needs to. They do this with varying degrees of success.

[James George]

found this one,
http://www.boostvalve.com/

guessing the r spec one below does the same and not a std bleed valve. anyone know if this is the case or have got it wrong


http://www.rspec.co.uk/index.php?main_page=product_info&products_id=206

[markey b]

isn't this similar principal to a grainger valve?