Re: Speedometer odometer issue/Avoid a 9000 Transmission Pull - Saab 9000 Bulletin Board - Saabnet.com
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Re: Speedometer odometer issue/Avoid a 9000 Transmission Pull
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Posted by thetallguy [Email] (#1698) [Profile/Gallery] (more from thetallguy) on Tue, 18 May 2021 20:03:50 Share Post by Email
In Reply to: Re: Speedometer odometer issue, Goblin [Profile/Gallery] , Tue, 4 May 2021 15:00:01
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You can test the speed tranducer by placing the end into a drill and rotating it...if the wiring is OK the speedometer will show an output if the cars electrical system is "on". If it does then the gears may be stripped on the transducer (pray that this is the case). If this is not the case then the gear ring in the transmission is shot. Mine was shot. If this is the case then you will need to provide a speed signal for the speedometer to work/prevent engine from falling out of idle/ stalling between gear changes/ and for full boost...My car is a TCS car so this is not so much of a problem. I am going to assume you have a non TCS car. So, when I researched this, the general consensus was that a transmission pull/rebuild was the only solution. This is not actually the case. As I say, what you need is a speed signal. I used the ABS signal from the ABS sensor ring which is the easy way to do this if its a TCS car (the ABS signal has too many teeth and over reports the revolutions of what should be the transmission speed). However, if you have time and you wish to avoid a transmission "pull" then it is possible to construct a "ring" with the correct number of "teeth" out of steel bolts embeded in a plastic pipe attached around the CV inner "driver" and pick up the signal with an ABS sensor attached to a transmission bolt/bracket near the "driver". The number of "teeth" is critical to accurately report speed. I have that count/ring at my warehouse...I will count them and report back. I apologize-I researched this and determined the number. I also made the "ring" but figured out a work around when using my existing ABS signal fix (only for TCS cars unless you also use an aftermarket signal modifier available for off road vehicles using oversized tires-that would allow a non TCS car to use an ABS signal*). I will remind you that if the speed is over reported, which is the case for using the ABS signal X4, you will have full boost very early on in the RPM range (too early) but are quickly restricted to a lower boost because Trionic 5 thinks you have surpassed 80 miles per hour and therefore restricts you to a lower/safer boost. For my car, there is an easy work around so I abandoned my "ring" fix. My speed is over reported/the speedo is way off and my boost would be limited except for the manual boost control valve I made which under reports boost. My solution has, so far, allowed me to avoid a transmission rebuild for another 100K miles. Note: * the ABS sensor is analog so a speed modifer would have to be able to modify that type of signal-I am not current on what is used on the more modern cars nor the current aftermarket offerings. PM me if its the transmission. I'll get back to you with the "tooth" count.


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