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Old 04-07-2007, 10:15 PM   #1
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speedo question

how does the speedo work. b/c i figured i would go check and make sure it was my clutch that was the problem. i ran it through second 2k to 6k and as soon as i hit for it 4k it just launches the rpms...but i watched the speedo and it goes up with it.... is the speedo driven by engine rpm and gear rang instead of speed sensor in the tranny, because it doesnt feel like wheel spin at all, and i dont hear any tire spin. but it doesnt put me in the seat like it used to. i dunno what is going on. are my tires spinning like crazy? it doesnt make much since because it didnt do this at first. the temp did drop a lot hear though it is 30* outside. but still i dunno, any suggestions Tom.


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Old 04-07-2007, 10:33 PM   #2
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Isn't the speedo just a function of the ECU??
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Old 04-07-2007, 11:47 PM   #3
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yeah but where does it get its input to drive the speedo? or does it use a combination of different sensors to run the speedo
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Old 04-08-2007, 08:08 AM   #4
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The spedo is picked up off the ringear where the axle goes in so if your seeing spedo go up it means the wheel speed is going up as well meaning the tires must be spinning

The best way to check the clutch is in 3rd or 4th at a little higher speed where the wheels wont spin but at high load then floor it and see if the RPM goes up but not the MPH ,If a clutch is going to slip tht is when it will do it
high load mid RPM

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Old 04-08-2007, 10:51 AM   #5
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thanks Tom, i'll try that out tomorrow on my way to work. i hope it is a traction problem. i can deal with that till i get the money saved up, lol. its just weird that it wasnt loosing traction as bad before. i done a couple things to my car in the last few days that i guess could have lead to a power in crease but i didnt think it would have been enough to cause that. i put the longer pipe on the intake to put the filter down farther and sealed up the exhaust. and its a lot colder now. idk maybe that little bit more power was all it need to cross the line between putting the power to the ground and lighting up the tires.
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