Syvecs Forums

Any thought put into having a variable frequency output for wheel speed, or vehicle speed. Still playing around with using an S6 in my Rx-7 and would love to keep the keep the cruise control. Cruise is controlled by its own computer that gets a square wave vehicle speed signal from the insturments (stock speedo is getting replaced since all other gauges are dropping like flys and it's only matter of time before it stops working). If I could get a signal from the ECU I can just wire it straight to the cruise computer and set X pulses per mile (or any distance measurment) to keep the cruise working.

Does it actually get it from the speedo, or the same signal wire that feeds the speedo ? Or is the speedo mechanical ?

Jaycar do a little box that allows you to adjust any speed pulse signal up/down 100% if you had to add a hall sensor somewhere to get a speed pulse.

http://www.jaycar.co.uk/productView.asp?ID=KC5435

See article here

http://autospeed.com/cms/title_Speedo-C ... ticle.html

The main issue I have is that the stock ABS sensor output an AC signal and the cruise is looking for a DC square wave at half the frequency of the ABS sesnors. I did find this http://sailesmarketing.com/products/can ... interface/ and I already will be using CAN to drive the gauges so I think I may have found a solution.

The frequency wont be same as factory but the cruise shouldn't care since all it knows is this one speed input.

The Jaycar kit above should do what you want.

As far as I can tell it can take an AC VR signal as an input and output a square wave signal. And you can adjust up/down by 0-100%

Although I just used it to adjust a square wave signal myself.