Beginning to wonder about the actuator - Saab 9000 Bulletin Board - Saabnet.com
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Beginning to wonder about the actuator
Posted by JohnCC (more from JohnCC) on Thu, 2 Jun 2005 01:50:30
In Reply to: MBC+A Will NOT Increase Peak Boost/Fuel Cutoff Limits, Peter Ingram, Wed, 1 Jun 2005 16:48:15
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I am finding that avoid hitting the cut out, I have to set the boost at a point where the car is generally more *mild* than it was with the APC system. Generally the boost rises quickly in a couple of seconds up a to a peak, and then within a couple of seconds more falls quickly back to a much lower level, and then over the next 2 or 3 seconds tapers off.
So for example if I open the throttle, I may hit 18 psi within a couple of seconds, then after a couple of seconds more it will fall to 15 psi, and then over then 3 or 4 seconds it will fall back to 10 or 11 psi.
The pressure I get in any given situation is quite variable, but I'm not sure how normal that is - I'm not sure how many variables affect the boost pressure (e.g. speed, gear, throttle position, rpm, gradient, etc.)
Trouble is, an actuator is not cheap, so it's not a case of just saying to heck with it and fitting one to see if it helps!
The "boost spike" that people talk about with MBC's.. how much is it usually, and how long should it last?
Also, with an MBC, would you expect the pressure to hold steady, or to taper off, and if so, how much and how fast?
posted by 80.5.89...
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