I have a Forge VTA dump valve which was fitted when i bought the car (2001 WRX). It came with a spare red spring, does this just change the venting sound?

Is it easy to change?

Graham.

 

Yes and yes
If it cam with the red spring being a spare then you will probably have the Whoosh blue spring already in place.

 

Will it no longer whoosh with the red spring?

Graham

 

Only when letting off at full boost
Deffo not as much fun

 

Thanks for the info.

Think I'll leave as is.

Graham

 

The red one is stiffer, and will lose your turbo spool up during gear change, as it wont allow as much gas to escape.

Keep the blue one.

MB

 

what about the yellow spring, I have it fit in my02 is this ok, sounds pretty good to me

 

Yellow is quite soft, and may leak boost at low revs. Really, it should make a short pshhh on let off. If its whooshing at low revs when you let off, then its probably a bit slack. Just try them all!

Some people do use the yellow, I have it in with some spacers. But going back to the blue one.

MB