dump valve springs?

[Markyboyt]

Ok, tbh I'm not 100% sure what turbin is saying - I know you can install the other way around to change the noise of them...

...but is the general consensus to go for the green or yellow spring? Thanks.

What turbins saying is that the dump valve works by vacuum lifting a piston allowing the air to flow through the valve, the one entry or exit pipe is on the side so acts on the side of the piston as opposed to on the spring, the other is directly under the piston so acts against the spring, if the pressure side is on the bottom acting against the spring it can help to push the piston and with a weak spring maybe even push it enough to dump the pressure, acting on the side of the piston it cant affect it as much.
If that makes sense.

 

[Markyboyt]

Ok i decided to do a quick (and yes very bad) picture to illustrate it.

In the first picture the inlet is under the piston so the pressure is acting on the spring, in the second picture the pressure is coming in from the side so isn't acting vertically on the piston or spring

 

[rickyjones1209]

to me its image one that looks the right one. How does image two work? Surely the dv wont work that way the spring wont be used at all.

 

[Markyboyt]

to me its image one that looks the right one. How does image two work? Surely the dv wont work that way the spring wont be used at all.

The vacuum pipe is connected on the top which is what actually opens the valve against the spring, then the vacuum drops off and the spring closes the valve

 

[rickyjones1209]

what are the pros and cons of each set up then? Is any way more audible than the other?

 

[Markyboyt]

what are the pros and cons of each set up then? Is any way more audible than the other?

Aparently one way is louder than the other, I think if you put the valve on its side then you get a louder sound through the air intake system as the charge air is recirculated. I just put mine on how the other one was.

 

[lordgibbness]

Hi remaps like Revo and CC need a stronger yellow spring
Not all of them do , in fact the APR stage 3 that APR designed ran a standard DV on it for quite a while
Sarah

Thanks Sarah, nice to know. I'll make sure I check with the remapper before I order.

 

[AwesomeSarah]

Hi
Yes pic 1will give more sound
Cracking pics there well done even I understood that

@ lordgibbness , your quite welcome
Sarah

 

[andycupra]

my understanding is that forge believe the OEM dv to be fitted the wrong way around.
pic 1 is more efficent, id imagine that image two would lead to more sound...