how is speedometer driven

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07-13-2003, 11:10 PM

mr. m

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how is speedometer driven

can anybody tell me how the speedometer is driven on a 2000 impreza rs. im looking into getting bigger tires but am curious as to how to have the speedometer corrected. thanks for any help.

07-14-2003, 04:14 AM

Mulder

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Join Date: Nov 2002

Location: NYC

Posts: 1,646

Car Info: 02 WRX WRB

The speedometer is driven electronically. There is a speed sensor in the transmission which sends pulses to the ECU and speedometer/odometer. The system is calibrated for a given number of pulses per mile based on the size of the stock tires. This info is programmed into the speedo and ECU and there is no way you can change it.
If you are planning to change tire/wheel sizes use the proper size so as to maintain the same overall rolling circumference as stock and your speedo won't change.

07-29-2003, 08:53 AM

Mikoyski

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New Jersey 2.5rs owners out there?

I would like to know how many members from NJ... Anyone out there with a OBD-II reader for the CEL codes? I'm from Jersey City, NJ. Drive safe everybody.