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 Jenny
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| posted on January 25th, 2006 at 11:02 AM |
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Another vehicle speed sensor alternative - maybe.
I'm tacking this on here to keep the VSS info together. I notice that the links on page 1 of this thread to the other VSS threads no longer work!
Anyway, I have been experimenting with some inductive gear tooth sensors, Turk part numbers Ni12U-M18-AN4X and Bi5-M18-AN6X. These were freebies, so
not sure what they'd cost, but an equivalent by Automation Direct is the Centsable inductive proximity sensor type AK1-AN-2A, which retails for about
$50.
These are open collector NPN output types. My idea is to mount the sensor so that it triggers off the hex cap bolt heads on the CV joint. They seem to
work OK on the bench but I have not tried them on the car yet. the Ni12U can be mounted up to 8mm away from the bolt and still trigger, while the Bi5
must be mounted withing 5mm.
Like I said, I haven't tried it on the car. One thing to note is that the Subaru VSS expects to see 4 pulse/wheel revolution. Using the CV joint cap
screws will give 6 pulses/rev. Not sure how well that will work, but I thought someone said the COR VDO part that goes between the speedo cable and
speedo actually puts out more that 4 pulses/rev and that works fine.
OK, found it here - VDo part = 6 pulses http://forums.aussieveedubbers.com/viewtopic.php?tid=32115&page=1#pid272497
[ Edited on 25-1-2006 by Jenny ]
[ Edited on 25-1-2006 by Jenny ]
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Transparu
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| posted on January 26th, 2006 at 11:17 PM |
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In my EJ22 I found the ECU is happy with 2 pulses per wheel revolution and has been running happily that way for maybe a year. Didn't try it with 6
though.
FWIW
Dave
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Jenny
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| posted on January 27th, 2006 at 06:28 AM |
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Thanks Dave,
I did find the old post that said 6 pulses was OK
http://forums.aussieveedubbers.com/viewtopic.php?tid=32115&page=1#pid272497
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robertocarlos
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| posted on July 29th, 2010 at 06:10 PM |
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Hi all
Well it's my turn to have a crack at the vss issue. Now I know the ecru needs a vss so it doesn't flip out but I actually need a proper and correct
signal as I am keeping my electronic subaru liberty dash. I know I can use a correction box to fine tune the final product, but how do i get the
right signal the subaru ecru is looking for? Is 4ish the correct number or is it just good enough? So which of the following would be better?
1) use the setup seagull has used with a plat mounted to the outer cv and have hall effect sensor as per this post (by the way seagull what are your
thoughts on this system now?)
2) attach a pulse generator to the end of the speedo cable and hope for the best?
http://www2.cip1.com/ProductDetails.asp?ProductCode=C12%2DV340%2D000
Thanks for your time and help
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rocknrob
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| posted on July 29th, 2010 at 06:51 PM |
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if you are using the subaru instrument panel connect the speedo up as well...i made an adapter out of metal brake line and the ECU is happy. been that
way for a couple of years. speedo reads too slow but its close enough to 2/3rds so if it reads 100 i'm doing 150... ...one of these days i'll make a little stepup box...or
maybe i won't
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Joel
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| posted on July 29th, 2010 at 07:00 PM |
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My $25 DIY proxmity sensor VSS has been working flawlessly for the last 5000kms, and same setup is working in elconcreto too
speed is accurate upto 300mph 
and the computer doesnt have a tissy on the dyno cos the speed sensor isnt turning cos it runs off the back wheels
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robertocarlos
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| posted on July 29th, 2010 at 08:00 PM |
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So you have connected the vss to a digital speedo?
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Joel
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| posted on July 29th, 2010 at 09:58 PM |
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Nope, I still run a stock speedo, but its just 5 pulses per wheel revolution same as stock subi VSS
It works off the axle so its 100% accurate
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Hutcho
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| posted on July 30th, 2010 at 09:17 AM |
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Could you guys that have functioning VSS setups please post some pics?
Cheers
Steve
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gazman
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| posted on July 30th, 2010 at 01:53 PM |
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This is the one in our V6 lowlight -
We asked Pat Gardner at V6 conversions nicely, sent him an old speedo cable, and he made us this sensor. It screws onto the back of the speedo and
then the stock cable screws onto the sensor. Has been working fine for a couple of years now....
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Bugaru03
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| posted on July 30th, 2010 at 05:48 PM |
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| Quote: | Originally
posted by gazman
This is the one in our V6 lowlight -
We asked Pat Gardner at V6 conversions nicely, sent him an old speedo cable, and he made us this sensor. It screws onto the back of the speedo and
then the stock cable screws onto the sensor. Has been working fine for a couple of years now....
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I have the same sensor but different branch and it works fine to me for the last 15000kms!
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ElusiveStranger
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| posted on July 31st, 2010 at 12:00 PM |
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'Kin Ell, resurrection time
http://www.vwkd.co.uk/bb/viewtopic.php?t=446
I hope I'm allowed to plug another site, I like to plug Hellbus's, Jorgan's, Brent's & Jim's pages
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robertocarlos
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| posted on July 31st, 2010 at 07:30 PM |
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Question for Joel - where did you find that 5 pulses per revolution is the right number for the ecu? from what i've read most people run 4.
i'm having so much fun at the moment...hahahaha
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Joel
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| posted on August 2nd, 2010 at 09:53 AM |
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Maybe its 4 for the later engines but all my research for 90s engines like mine said 5 pulses and my donor Libertys speed sensor certainly gave 5
pulses per wheel revolution.
With the earlier ones it doesnt really matter, just as long as the ECU knows that the car is moving or not, Some people just run with 2 pulses,
Later ones use the vehicles speed to dictate what speed the rad fans run at.
Either way I feel its better than a pulse generator which makes the ECU think the car is permantly moving.
Heres my setup,
Its an inductive proxmity sensor, basically a metal detector.
I could run a speedo off it if need be but stock speedo aint broke
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robertocarlos
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| posted on August 24th, 2010 at 05:33 PM |
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Just another question about the type of pulses the ecru is expecting. Square wave? Amplitude? Length of each pulse? As mentioned previously I need
to replicate the signal perfectly so the electronic subaru speedo doesn't flip out.
Cheers
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ratbug
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| posted on August 24th, 2010 at 07:48 PM |
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| Quote: | Originally
posted by robertocarlos
Just another question about the type of pulses the ecru is expecting. Square wave? Amplitude? Length of each pulse? As mentioned previously I need
to replicate the signal perfectly so the electronic subaru speedo doesn't flip out.
Cheers
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By the success of all the different setups it looks like it doesnt matter too much. It wants a square wave, from GND to about 12V. Length or duty
cycle probably doesnt matter, it probably works by counting the edge rise/or fall from 0 to 12V.
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Hutcho
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| posted on August 24th, 2010 at 08:55 PM |
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Joel,
Do you know if your prox switch is NPN or PNP? I've installed an NPN (ECU speed signal wire switches to ground, PNP output switches to 12 V) as I
thought this is what the ECU should see as per the rest of devices in the wiring circuit.
Just interested to see what you're running.
Cheers,
Steve
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Joel
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| posted on August 24th, 2010 at 09:08 PM |
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Hi Steve, its an NPN
is it the same looking unit as mine?
one of my mates in the US has just got one for his and its got all the same wiring, brown, black and blue
mines setup up brown is ignition power, blue is earth and black is ECU signal
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pete wood
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| posted on August 24th, 2010 at 09:43 PM |
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| Quote: | Originally
posted by Bugaru03
| Quote: | Originally
posted by gazman
This is the one in our V6 lowlight -
We asked Pat Gardner at V6 conversions nicely, sent him an old speedo cable, and he made us this sensor. It screws onto the back of the speedo and
then the stock cable screws onto the sensor. Has been working fine for a couple of years now....
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I have the same sensor but different branch and it works fine to me for the last 15000kms!
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got one too. it runs on an EJ25 too. works great, no dramas
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Mick058
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| posted on August 25th, 2010 at 07:56 AM |
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| Quote: | Originally
posted by pete wood
| Quote: | Originally
posted by Bugaru03
| Quote: | Originally
posted by gazman
This is the one in our V6 lowlight -
We asked Pat Gardner at V6 conversions nicely, sent him an old speedo cable, and he made us this sensor. It screws onto the back of the speedo and
then the stock cable screws onto the sensor. Has been working fine for a couple of years now....
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I have the same sensor but different branch and it works fine to me for the last 15000kms!
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got one too. it runs on an EJ25 too. works great, no dramas
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These gave me huge issues - the one that i had brought broke within a couple of hours. Got a new one, same thing happened. Looked the exact same. Not
sure why mine kept failing.
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pete wood
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| posted on August 26th, 2010 at 03:13 PM |
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was in a NEW speedo cable? the guy who made mine up said put it in a new one.
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gazman
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| posted on August 26th, 2010 at 03:20 PM |
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Yeah we put in a new cable when we fitted ours too.....
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robertocarlos
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| posted on August 29th, 2010 at 04:33 PM |
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Hi all,
Thanks for everyones input. I've been doing some more research and according to a Subaru Diagnostics page the ideal siganl the ECU is looking for is
0V-5V with a length of approximately 100ms. Now its time to find something that will generate that kind of a signal.
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flat_iv
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| posted on August 30th, 2010 at 10:23 AM |
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What I did and it works perfectly is to use a NPN prox switch and it reads off the front wheel studs. I drilled and tapped a hole in the front
spindle. screwed in the prox. Been working for several years now. Using it with a 95 2.2 ECU.
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