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Hi,
I received this mysterious e-mail about DI and Dr. Boost.
We talk about issues with cars, and when people are concerned we try to
pass on the best information.
I myself change oil every 5,000 miles with fully synthetic Mobil 1,
even though some may consider that overkill. I plan to keep my Saab
for 1/4 million miles. We baby our babies. If there is a 1%
chance that your real live baby may catch a serious flu but you could
immunize him and prevent the illness, would you not immunize
him? Discussion of issues should not be misconstrued by newcomers. If
they are, they have not read the mission statement of TSN (link below).
They're the same ones that don't know that Scott is the moderator.
Jason ... come back baby. We all love you.
thanks
Jae
(Now back to Dr. Boost and DI)
------------------------------------------------------------------------
His post on the bulletin board explains how the DI is designed, and this design would support heat as being the primary cause of failure. Capacitive discharge designs are what power the magnetron in your microwave. They are not the most reliable designs, and the failure point can be either the triac or the capacitor, both are pretty sensitive to high temperatures. Triacs are known to "leak current", and if this occurs it would explain a constant voltage on condition to a primary coil. When the capacitor breaks down, you would begin to experience the misfires and loss of power. So I believe the failures of the 9-5 DI are more numerous than those of the 9-3 due to the presence of the triac in the 9-5.
The good news is that SAAB seems to be fully aware of the drawbacks of this design, and according to Dr Boost are replacing in the new 9-3 with inductive discharge system. This would eliminate the capacitor as a failure point, but I believe there will still need to be some silicon components in the inductive design to boost the voltage supplied to the inductive system. But it should mean significant improvement to the reliability of the DI, because the inductive system will rely on transformer coils instead of a capacitor, which are more sensitive to high temperatures. The new DI will have a high voltage circuit similiar to that employed in the high voltage circuit of a TV.
posted by 172.193.201...
http://www.saabnet.com/tsn/mission.html
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