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vanis13
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Joined: August 15, 2010
Posts: 3097
Location: ABQ NM USA.... Except when not
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 Posted: Sat Dec 06, 2014 7:22 pm Post subject: $3 VSS – speed sensor - cruise or Subaru |
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$3 VSS – speed sensor - cruise – Subaru
bolt head passes under sensor and generates a speed signal
LJ12A3-4-Z/BX Inductive Proximity Sensor Switch NPN DC6-36V
Ebay search – http://www.ebay.com/sch/i.html?_from=R40%7CR40&...PrefLoc=98
12/6/14 $2.47 Asia, $3.25 form US
Based on the Rocky Mountain West VSS - http://www.rockymountainwesty.com/product_p/rmw-ch395ss.htm
I bought the RMW VSS but my AutoZone lifetime CV axles have a different boot flange profiles so the RMW metal ring became out-of-round when I tightened the bolts. This caused the distance between the sensor and the ring to vary in distance. Interestingly <30mph, that ovaling wasn’t an issue, however over that speed the reading became erratic and even at 70mph it showed about 47mph.
Middle of the night AHA!!! - use the bolts.
The RMW and SC have 5 sensors and there are 6 bolts so at actual 72mph I get shown on the Torque app 80mph. Not an issue since 1) Torque has a custom speed calibration 2) the cruise control cares about relative and not actual speed and 3) the Subaru ECU just needs varying speed. The Subau ECU doesn’t like speeds above 120mph but that means I would have to be doing 108 mph before it became an issue. BTW, the Torque factor for me was 0.9 = 15” rims with BFG tires.
Also the cool thing about this sensor is that it has an indicator light that illuminates when the sensor triggers so you can see if you have it set right when you hand-turn the wheel. Be aware that in my ovaling issue mentioned above it illuminated at slow speed but had issues at higher speed. Also – I read that closer is better for this sensor. I have mine about 2mm off the bolts. Don’t stress about putting it too close since the plastic end can withstand some abuse as I learned when my ovaled RMW ring hit it.
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83.5 Westy with Subaru 2.5, 4 spd manual, center seat, COLD A/C on 134a!, Winter camp heated with an Espar B4 gasoline furnace
www.SuperVanagon.com - some stuff I make
Last edited by vanis13 on Sun Dec 07, 2014 10:18 am; edited 1 time in total |
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61Scout
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Joined: November 06, 2011
Posts: 1297
Location: Shoreline/Yakima WA
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ALIKA T3
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Joined: July 30, 2009
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Location: Honolulu,Hawaii and France
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Ahwahnee
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Joined: June 05, 2010
Posts: 9808
Location: Mt Lemmon, AZ
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| Posted: Sun Dec 07, 2014 9:11 am Post subject: |
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nice find. can you describe the wiring [since hong kong parts usually come with minimal instructions]?
my guess is that one the leads is powered and the other 2 are the usual sensor pick-up.
fwiw - looking at it for a different application than what you did but helpful nonetheless. |
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vanis13
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Joined: August 15, 2010
Posts: 3097
Location: ABQ NM USA.... Except when not
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| Posted: Sun Dec 07, 2014 9:23 am Post subject: |
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I'll have to check how mine ended up but if I recall correctly:
+ = Brown
- = Blue
sensor = black
from - http://www.cncmaker.com/filesupload/proximity_connectionLJ12A3.pdf
Connect the wires in the following order by finger twisting the bare ends together
and covering the bare connection with the small wire nut. The black common should
be connected to the power feed common of the control power system. The brown
wire will tied to the power feed voltage, 12VDC to 36 VDC, depending on the type of
switch. The blue wire will be connected to the device that is being electrically
controlled, usually a small electric relay.
_________________
83.5 Westy with Subaru 2.5, 4 spd manual, center seat, COLD A/C on 134a!, Winter camp heated with an Espar B4 gasoline furnace
www.SuperVanagon.com - some stuff I make |
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kalispell365
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Joined: April 01, 2010
Posts: 889
Location: PNW
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| Posted: Sun Dec 07, 2014 9:34 am Post subject: |
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Good stuff!
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1983 Diesel Vanagon Westfalia chassis with Subaru 2.2l |
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16CVs 
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Joined: February 22, 2004
Posts: 4024
Location: Redwood City, California
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| Posted: Sun Dec 07, 2014 11:02 am Post subject: |
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So are you running a Subaru cruise set up or a Vanagon ?
Stacy
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1987 Syncro Westfalia Triple knob (bastard)
1989 Syncro Tristar Triple knob "Swedish"
2013 Jetta Hybrid a true "Zwitter"
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Call anytime number 650 722 4914 .
Keep Your van running and upkept tastefully for the love of the hobby.
Don't let your van end up in an "abortions" thread. |
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vanis13
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JeffRobenolt
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Location: Wisconsin
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| Posted: Sun Dec 07, 2014 11:57 am Post subject: |
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Awesome!!! Just bought 10.
The vendors have quite the mark up on these.
I also use Rostra aftermarket cruise control. They have a stalk that looks factory also.
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insyncro
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Joined: March 07, 2002
Posts: 15086
Location: New York
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| Posted: Sun Dec 07, 2014 12:19 pm Post subject: |
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| which signal divider are you Guys using for a Syncro? |
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djkeev
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Joined: September 30, 2007
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16CVs
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Joined: February 22, 2004
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Location: Redwood City, California
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| Posted: Sun Dec 07, 2014 12:40 pm Post subject: |
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I am thinking of mounting this on my front inner CV and using a 2WD Cruise module (ECU) and By passing my shared signal from my GW VSS which feeds my Subaru ECU.
The upside of this is I can use the now unused OXY sensor wiring to tie into the factory VSS from the cruise ECU.
I have a factory cruise installed which barely functions. this might be the answer.
Stacy
_________________
1987 Syncro Westfalia Triple knob (bastard)
1989 Syncro Tristar Triple knob "Swedish"
2013 Jetta Hybrid a true "Zwitter"
Samba member # 14980
Call anytime number 650 722 4914 .
Keep Your van running and upkept tastefully for the love of the hobby.
Don't let your van end up in an "abortions" thread. |
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dobryan
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vanis13
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Location: ABQ NM USA.... Except when not
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| Posted: Sun Dec 07, 2014 2:08 pm Post subject: |
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curious, what are you using for the VSS now?
_________________
83.5 Westy with Subaru 2.5, 4 spd manual, center seat, COLD A/C on 134a!, Winter camp heated with an Espar B4 gasoline furnace
www.SuperVanagon.com - some stuff I make |
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dobryan
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vanis13
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Joined: August 15, 2010
Posts: 3097
Location: ABQ NM USA.... Except when not
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| Posted: Sun Dec 07, 2014 2:44 pm Post subject: |
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created a topic on the Rostra CC to keep Qs specific to that unit there.
http://www.thesamba.com/vw/forum/viewtopic.php?p=7472309#7472309
the VSS stands for Vehicle Speed Sensor.
Look at that post and ask away. The Rostra is a great unit.
_________________
83.5 Westy with Subaru 2.5, 4 spd manual, center seat, COLD A/C on 134a!, Winter camp heated with an Espar B4 gasoline furnace
www.SuperVanagon.com - some stuff I make |
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JeffRobenolt
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Joined: February 25, 2007
Posts: 1513
Location: Wisconsin
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| Posted: Sun Dec 07, 2014 3:34 pm Post subject: |
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As for engine conversions and aftermaket cruise controls go, the ecm or cruise box needs to see some kind of speed.
I'm not worried about it being dead on. Depending on gearing and tire size no one I know makes an adjustable one to dial it in.
On OBD2 conversions, I use torquepro for gauges, they have an option for a GPS speedo instead on what the ecm is reading from the sensor.
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JeffRobenolt
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| Posted: Sun Dec 07, 2014 3:37 pm Post subject: |
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My only question is that the vendors option uses magnets spinning on that axle.
Did you put little magnets on the CV bolts or is this senor different and have the magnet in it like can and crank sensors?
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| jfats808 wrote: |
| Most, some, few is not all. You can always learn something from everyone , even the fool. |
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vanis13
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Location: ABQ NM USA.... Except when not
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| Posted: Sun Dec 07, 2014 3:40 pm Post subject: |
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This sensor detects metal moving by (or to/from) it.
The small car speed ring one uses magnets.
The RMW uses this type of metal sensing sensor and picks up on the METAL tabs that protrude from their cool speed ring.
In this case, the bolts provide the metal moving by the sensor to trigger the sensor.
_________________
83.5 Westy with Subaru 2.5, 4 spd manual, center seat, COLD A/C on 134a!, Winter camp heated with an Espar B4 gasoline furnace
www.SuperVanagon.com - some stuff I make |
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insyncro
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Joined: March 07, 2002
Posts: 15086
Location: New York
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| Posted: Sun Dec 07, 2014 4:09 pm Post subject: |
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Check Andrew Flint's reversed 1.8T builds.
He drills the rim of the CV boot flange with the number of holes needed to activate the sensor for traction control.
Not exactly cruise control, but same trigger. |
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