| Author |
Message |
dwdufour
Samba Member
Joined: April 01, 2015
Posts: 65
Location: Texoma
|
 Posted: Sun Oct 14, 2018 4:47 pm Post subject: GPS Speedo with VSS output |
 |
|
I have a Subaru swap and am considering switching to a GPS Speedo since mine is on the fritz and metric.
Does anyone know of a GPS Speedo that I can connect my VSS too? |
|
| Back to top |
|
 |
kourt
Samba Member
Joined: August 13, 2013
Posts: 1948
Location: Austin, TX
|
| Posted: Mon Oct 15, 2018 12:23 am Post subject: Re: GPS Speedo with VSS output |
|
|
That’s is a strange question: a GPS speedo assumes no need for a vehicle speed sensor (VSS). You are not likely to find a gps speedo with a VSS input. What are you trying to accomplish?
Kourt |
|
| Back to top |
|
|
dwdufour
Samba Member
Joined: April 01, 2015
Posts: 65
Location: Texoma
|
| Posted: Mon Oct 15, 2018 1:22 pm Post subject: Re: GPS Speedo with VSS output |
|
|
| I have a Subaru swap. Don't I need a signal for the ECU? |
|
| Back to top |
|
|
dobryan
Samba Member
Joined: March 24, 2006
Posts: 16505
Location: Brookeville, MD
|
|
| Back to top |
|
|
Jake de Villiers
Samba Member
Joined: October 24, 2007
Posts: 5911
Location: Tsawwassen, BC
|
| Posted: Mon Oct 15, 2018 1:44 pm Post subject: Re: GPS Speedo with VSS output |
|
|
A GPS works on radio waves whereas a VSS is a generated electrical voltage signal.
If it were easy to meld those two very different devices surely all the new cars would be using GPS powered VSS - but they aren't...
Its pretty simple to put a VSS generator in your speedo head or on the inboard CV joint.
_________________
'84 Vanagon GL 1.9 WBX
'86 Westy Weekender Poptop/2.5 Subaru/5 Speed Posi/Audi Front Brakes/16 x 7 Mercedes Wheels - answers to 'Dixie'
@jakedevilliersmusic1
http://sites.google.com/site/subyjake/mydixiedarlin%27
www.crescentbeachguitar.com
www.thebassspa.com |
|
| Back to top |
|
|
tristessa
Samba Member
Joined: April 07, 2004
Posts: 3992
Location: Portland, OR
|
| Posted: Mon Oct 15, 2018 2:42 pm Post subject: Re: GPS Speedo with VSS output |
|
|
| The GPS speedometer senders I'm familiar with put out 16000 pulses per mile, which would probably freak out the Suby ECU... |
|
| Back to top |
|
|
kourt
Samba Member
Joined: August 13, 2013
Posts: 1948
Location: Austin, TX
|
| Posted: Mon Oct 15, 2018 2:52 pm Post subject: Re: GPS Speedo with VSS output |
|
|
Howdy,
I think I understand your question now.
The simplest way to obtain a VSS signal is to use a sensor on a CV joint. I know not all conversions are the same, but in the Bostig conversion (for example) the VSS signal is generated by an installed flange on on inboard CV joint, with a sensor bolted to the transaxle. The sensor is used in a binary fashion: it only needs to know if there is motion or no motion. You can also use the sensor signal to drive a speedometer in an Ultragauge or similar product--and would require calibration with a GPS.
GPS speedometers are getting their speed readings from GPS receivers, and are usually manufactured in the context of either not having or not wanting a VSS in the instrument cluster, but I admit I would also be interested in a GPS speedo that passed configurable VSS signals for ECU or cruise control use.
If your Subaru conversion needs a VSS, see this Youtube video about a poor man's VSS for a Subaru conversion.
At first I thought you might need a VSS for cruise control functions. Dakota Digital makes a device that dumps speedo and tach signals from OBD, which might be useful. I have Speedhut gauges, including a GPS speedometer, and so I have to use a device like this to serve data to my aftermarket cruise control computer, as I no longer have a mechanical speedometer cable.
I hope this helps.
kourt |
|
| Back to top |
|
|
dwdufour
Samba Member
Joined: April 01, 2015
Posts: 65
Location: Texoma
|
| Posted: Mon Oct 15, 2018 5:22 pm Post subject: Re: GPS Speedo with VSS output |
|
|
| Beautiful. Thank you. |
|
| Back to top |
|
|
kublerwagen
Samba Member
Joined: February 28, 2012
Posts: 104
Location: Portland, OR
|
| Posted: Mon Oct 15, 2018 9:04 pm Post subject: Re: GPS Speedo with VSS output |
|
|
| There are GPS devices that turn a cable at a configurable rate to operate vintage speedometers. I saw them a time or two at the vintage car swap meet in Portland but know nothing else beyond their existence. Something like this link: https://www.speedhut.com/ecommerce/product/2585/SPEEDBOX™-GPS-VSS-to-Mechanical-Drive-Speed-Converter |
|
| Back to top |
|
|
Jake de Villiers
Samba Member
Joined: October 24, 2007
Posts: 5911
Location: Tsawwassen, BC
|
|
| Back to top |
|
|
|
