Date: Wed, 20 Oct 2004 16:25:39 GMT From: hohnospamlid.invalid (Goran Larsson) Subject: Re: Manual Boost Control Valve Kick --why?
In article <nLvdd.32920$cN6.17695nospamread02>, 9-3Turbo <NoSpamnospamRS> wrote: > Hello, in my 1999 9-3, I have replaced the ecu with an abbott > performance as well as install aftermarket blow-off valve, waste gate > and a manual boost control. A MBC, morons boost control, is a bad idea. It disturbs the system so much that the Trionic ECU is unable to properly control and protect the engine. > When I set the boost control valve a little > higher, ie. when the boost valve goes all the way to the end of the red > area of the gauge, the car kicks, and the boost starts over again. This is the Trionic systems last attempt to protect the engine. It shuts of fuel delivery by closing the fuel injectors and shutting off the fuel pump. Before this brutal step the ECU tried to lower the boost, but the pressure leak caused by the MBC prevented if from opening the waste gate. > I > have turned it down before though so it doesn't kick at all, but I do > loose considerable mid-range boost. Saabs with Trionic systems should be tuned by software changes, not by introducing leaks that disturbs the control algorithms in the Trionic ECU. If you need more boost you have to get new software for the Trionic ECU and perhaps some new hardware like larger fuel injectors (you can't get more power just by adding more air), turbo, exhaust system, etc. -- G–ran Larsson http://www.nospam.com/saab/
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