VSS Signal conditioner

[Shannen Durphey]

Saturn does some strange things with their VSS signals.  The speedo signal is
3000 (or was it 5000) pulses per mile, rather than the 2k or 4k that GM usually
likes to use.  Better make sure the signal conditioner does everything you need
it to.
Shannen

Adam Chant wrote:
> 
> OK, here's where the stupid question comes in. I say it's stupid because my solution
> is to just hack the PCM, but other people see this as a safe solution. I digress...
> 
> Say you get the SGI-5 and place it between the VSS and PCM. You set the SGI-5
> to 1/2 sample the VSS signal an affectivly double your maximum MPH limit.
> OR
> You have a switch enable the SGI-5 w/ 1/2 sampling just before the normal cut
> off, offering the same solution.
> 
> Does the engine RPM come from the VSS or CPS?
> Aren't the Timing and Fuel maps based on RPM?
> 
> Acording to 2 FSM's (OBDI and OBDII):
> "The PCM uses VSS input to provide vehicle speed to the instrument cluster for
> the speedometer. On vehicles equipped with cruise control, this signal also
> goes to the cruise control module and PCM."
> 
> -Adam
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