Re: more control - Saab Performance Bulletin Board - Saabnet.com
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Re: more control
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Posted by Dean [Email] (more from Dean) on Mon, 12 Jun 2006 17:33:41 Share Post by Email
In Reply to: more control, Brownie, Mon, 12 Jun 2006 14:52:59
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I was asking about the that point and was told that for high boost levels, (22 PSI), the force on the WG valve face is enough to overcome the stock spring force and then the WG leaks before its meant to open. So a WGA with a stronger spring is needed. A stronger WG spring will make the WG open slower, so there is an increased potential for boost pressure overshoots. This might never happen with a properly setup APC system, but it is a real concern with the MBC applications that make a turbo spool up a lot faster. A MBC or MBC+A on a C900 is not something to be approached casually as there are many AF control concerns with these vehicles. I mention the MBC only to illustrate what can happen when the turbo gets on boost very fast and a WGA cannot open the WG fast enough. The MBC+A overcomes the pressure overshoot problems that are intrinsic to the MBC.

If the WG is forced open that will not produce a boost surge. Late opening of the WG leads to pressure overshoots. It has been stated that a WG that is too small, may not be able to waste enough flow at high CFMs on highly modified vehicles and that that could lead to boost pressures above the 'set point'.

The integral WGs return the WG flow at 90 degrees to the turbine discharge, and that can mess up the flow and limit the turbo's effectiveness at high CFMs in high output turbo mods. Then integral WG is cheap and effective for OEM applications, but does have limits. External WG's and associated plumbing on top of a turbo without a WG is a lot of $$$

My C900 experience is quite limited, but I am getting an introduction :)

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