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R33 Gtst Speedo Sensor Resistor Vaule

boostn0199

By boostn0199,
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boostn0199 Grand Master

boostn0199

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Anyone know the vaule resistor that the stock gtst cluster uses to convert the speedo signal going to the ecu? Ive binned the cluster and just want to keep running the speedo signal direct to the ecu and get the reading off the power fc but now it is reading to high as there is a resistor used in the cluster to correct.

boostn0199 Grand Master

boostn0199

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Can you play with the speedo signal with your ECU?

Ill see if I can find anything in the wiring diagram but dont recall any in the cluster

Dont think theres anytging ecu side muck around with it. On the wiring diagram shows ecu output to a resistor then to speed sensor now since originally the ecu gets the signal from cluster im assuming the resistor for correctiin would be there.

Might have to much around with a potentimeter see if i cand find the value.

Edited by boostn0199
89CAL Grand Master

89CAL

Posted
Posted

I can't find a resistor in my wiring diagram. Can I ask which diagram you are using?

I wasnt sure if you had a standard ECU or not. The Link ECU's allow you to modify the speed sensor input frequency to road speed, so if your speed is a little out on the ECU, you can adjust it to give true road speed

boostn0199 Grand Master

boostn0199

Posted
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I

I can't find a resistor in my wiring diagram. Can I ask which diagram you are using?

I wasnt sure if you had a standard ECU or not. The Link ECU's allow you to modify the speed sensor input frequency to road speed, so if your speed is a little out on the ECU, you can adjust it to give true road speed

I got power fc. This is the diagram ive seen it on, which one are you using?

http://www.sau.com.au/forums/uploads/post-2917-1129784245.jpg

89CAL Grand Master

89CAL

Posted
Posted

Ignore the resistor. It's just showing the sensor itself and how it is drawn. Bit decieving in that diagram, the one I have shows the speed sensor (as pictured, then wiring which goes through a plug on the way to the cluster

SpeedSensor_zpsdcee4377.jpg

boostn0199 Grand Master

boostn0199

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The cluster must alter the signal somehow because its reading 4times the speed wired directly to sensor now or either the ecu just takes the reading off the the std speedo gauge itself.

Have mucked around with resistors today added 1k but did not change anything.

89CAL Grand Master

89CAL

Posted
Posted

Odd the diagram shows nothing in the line between the sensor and the cluster. There is a VSS module inside the cluster that might alter the signal out

If you dont want the cluster, maybe you could pull it apart and have a look whats inside, then either add the same thing to the circuit or pull the VSS module out of the cluster and run it inline.

I wouldnt think it would be a resistor it needs in the circuit because as far as I know the ECU wants to see frequency, so pulses/second etc

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