Date: Mon, 31 Mar 2003 08:29:52 GMT From: hohnopsamlid.invalid (Goran Larsson) Subject: Re: Changing suspension on new 2003 9-3?
In article <4lcg8vc18otg8f44glnt57qeumnjdlv7r1nopsamcom>, 'nuther Bob <noemailnopsammain.com> wrote: > That's interesting. I hadn't heard that about the T-7. The T5 system regulated the turbo pressure to give the stated performance. The T7 is different, it tries to follow a preprogrammed torque curve. If the spec says 300Nm you get 300Nm even if the air is cold and moist. The torque that you get is controlled by several parameters. The accelerator is the input demanding a certain torque and then several limits are applied; max torque at the current rpm, max torque at the current gear, max torque during automatic gearbox gear change. Torque is also limited to avoid going over certain other limits; rpm, max speed, speed set by cruise control. Limits do also change due to engine temperature etc. The limits are gradual, so it can be hard to notice the difference between rpm limit, speed limit, or drag. It is not like the rpm limit and fuel cut off in older Saab turbos. How this is done is described in detail in the workshop manuals for the Trionic 7 system. > The limit > you mentioned is close to the drag limited speed from what I've > heard, so it may not matter much. It also makes it harder to notice them. The limits do however have a purpose. If the non-Aero 9-5 is limited to 240km/h it can use "cheaper" V rated tires (240km/h). -- G–ran Larsson http://www.nospam.com/saab/
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