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 pete wood
A.k.a.: figure itout
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| posted on March 25th, 2004 at 10:06 PM |
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speed sensor
2 alternatives I know of;
1/ I have had a speed sensor fitted to my speedo cable by a local automotive instrument specialist. It was only a few hundred dollars including the
cost of a new speedo cable. The guy who installed it runs a business in Marayong in the Western suburbs of sydney called MIS (mobile instrument
services).
2/ Fit a pulse generator for the number of pulses at about 60km/h. It put's this pulse out whenever the ignition is turned on.
However, this makes the engine think it is constantly doing 60km/h. This can screw with your idle control and stop the engine doing fine tuning on the
freeway for good fuel economy.
If you guys can find a cheaper effective alternative, more power to ya! :thumb
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pete wood
A.k.a.: figure itout
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| posted on March 25th, 2004 at 10:08 PM |
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speed sensor
the previous message was for subarus as that is what I have, but I think both alternatives are available for other makes of engine (different makes
require different numbers of pulses/rev).
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tonyg
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| posted on March 27th, 2004 at 06:52 AM |
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Peter, apropros speed sensors, I fitted a reed switch to back of speedo and ajusted it with another magnet to get sensitivity right... seems to work
fine and if I can do it, anyone can. I can send instructions if you want; I think I have them saved on comp from "SmallCar" in US...
tony g
they took me away haha, hope the medication works
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tonyg
Seriously Crusin Dubber
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| posted on March 27th, 2004 at 06:52 AM |
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Peter, apropros speed sensors, I fitted a reed switch to back of speedo and ajusted it with another magnet to get sensitivity right... seems to work
fine and if I can do it, anyone can. I can send instructions if you want; I think I have them saved on comp from "SmallCar" in US...
tony g
they took me away haha, hope the medication works
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pete wood
A.k.a.: figure itout
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| posted on March 28th, 2004 at 02:06 PM |
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speed sensor
thanx for the tip, but my sub is already running
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humpty
Bishop of Volkswagenism
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| posted on April 15th, 2004 at 01:25 AM |
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More variations
Here's some other ideas.....I got this from a gentleman who lives in Qld.
A great guy who owns another Subi power Transporter. He in turn got this info from someone else and has described what he did to make it work and
why....Very helpful I think.
Enjoy......Humpty
____________________
The parts are free (or almost so).
The circuit requires one only component(plus 4 magnets). I used magnets from a disgarded hard drive. They are very much more than adequate. I put
four equally spaced dobs of silicone rubber onto the cleaned RHS CV joint. Then I carefully put the magnets on top of the silicone rubber and
removed excess silicone rubber. The rubber almost isn't necessary as almost nothing can remove the hard drive magnets once there!
I built a small bracket which I mounted on one of the transmission cover bolts and to which i attahced the competed sensor.
The hall effect sensor requires 12 volts from the battery and sends a pulse to the ECU as required. My advice would be to make up the shielded lead
and put a length on sufficiently long to run up into the engine bay and then have a pair of connectors there that connect to ground, power and the ECU
input. Encapsulate the IC in epoxy or even silicone rubber and thoroughly cover the connections to the cable. Mount the sensor on the bracket with a
couple of cable ties, so it is within a few mm of the magnets. Check that it clears all magnets.
Concerning Reed Relays and magnets.
A friend of mine has worked for 30+ years with Australia's largest telecomunications network. He is an electrical engineer. In telephone exchanges
here, Ericson reed switches used to be used and he knew them intimately. He was adamant that I should not use a reed relay.
Consider this. Around town, an average car probably has a wheel rotation of 500 rpm. The EJ22 requires 4 pulses per revolution. This means that the
reed relay is operating at 2000 operations per minute.
This means the reed relay would operate 6,000,000 times per 100 hours of driving. The quality of reed switches available here in Australia would be
such that they probably have a life of only a few hundred thousand operations if you are very, very lucky. This was why he advised against reed
switches.
Given that our VW/Subaru use isn't critical, maybe the simpler reed switch is OK as it can be replaced, but the Hall Effect VSS on file (I have this
if anyone is interested - Humpty) will outlive our Subaru engines, I venture to suggest. It is free. It works. It is achievable even by the most
feeble-minded (grey-haired) of us. I believe it is also elegant.
I hope this is helpful. I pass the information on with gratitude to both the originator and to the group which has been so very helpful to me.
Dave
downunder.
With full respects to whomever sent me the file.
[Edited on 14-4-2004 by humpty]
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Transparu
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| posted on April 15th, 2004 at 08:03 PM |
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GENTLEMAN indeed!!!!
Dave
downunder!
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Jenny
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| posted on April 23rd, 2004 at 12:38 PM |
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Here is a link to the Toyota training info on VSS
http://www.autoshop101.com/forms/h36.pdf
Lots of other good info for the EFI newbie http://www.autoshop101.com look
under tech articles
[Edited on 23-4-2004 by Jenny]
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ratbug
A.k.a.: Andrew Todd
Wolfsburg Wizard
aka toddy101
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| posted on April 23rd, 2004 at 02:20 PM |
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I made my own device for driving the Mitsubishi Lancer electronic speedo used in the buggy. First of all hooked the speedo up to a signal generator
and recorded the pulses Vs speed readout relationship. Then worked out linear speed Vs roatational speed of the VW speedo cable using the
circumference of the VW wheels.
It worked out I need 5 pulses per wheel revolution. So got a plastic circular disc, cut out 5 equally spaced notches and mounted it on the end of the
VW speedo cable. A Dick Smith Photo Intterupter was used to sense the notches with a few added biasing resistors. The photo interrupter was then
aligned to the spinning disc and screwed down.
Even though you want a pulse for the ECU, you could use the same approach, and it wouldnt matter if it was a bit innacurate.
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humpty
Bishop of Volkswagenism
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| posted on April 25th, 2004 at 03:21 PM |
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VSS...Fro the gentleman in QLD!
Good idea ratbug...Nifty solution that one!
As we can see the are plenty of ways to skin this cat!
And Dave......You ain't no gentleman huh?
I can keep your secret!
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seagull
Compulsive Aussie Vee Dubber
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| posted on June 7th, 2004 at 11:13 PM |
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bump
Looking for that special lady : PM me for coffee & cake
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