15th September 2004, 02:54 PM
I just recently bought a forge BOV for my 96 900set off of ebay and when I received i took it apart to find that there was only the yellow spring in it. I believe that this is the lowest rated spring offered for the valve...yellow, green, blue, red? I am going to be getting a MBC+A soon so is that spring going to be able to handle the boost well? I also though I read somewhere about different kinds of forge bov...something about nylon ones and metal ones? Anyone know anything about this?
15th September 2004, 03:41 PM
I have a Forge DV with Alloy top ram piston. It does not work top well at present, with being new it needs to bed in.
See here (http://www.saabcentral.com/forums/viewtopic.php?p=326805#326805)for the discussion
Forge sell a tuning kit for their DV valves.
Also the top Ram piston can be upgraded to an alloy version. As mine is. The rerason for this is not aparent at first but over years or hard use the nylon version of the ram piston can swell and not allow the full 'dump' action to occur a sought of partial seisure if you like.
Infact all the components of a Forge valve can be changed the main spring as in your yellow one can be up or downgraded for fine tuning the springs can also be shimmed. The lower valve can be replaced and its spring can also be renewed.
You may be able to just shim the current spring if required when you up your boost.
See the shot of my DV4 you can see the alloy top ram through the VENT HOLES.