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 speedster356
A.k.a.: Peter Mcleod
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| posted on May 3rd, 2004 at 10:24 PM |
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Tacho conversion-Subaru to VDO
Looks like the ecu triggered tacho signal is not good for my VDO tacho (EJ20T to Porsche 914). It was run as per standard setup from the coil on the
old Subaru engine (EA82T).
Any electronic gurus out there can solve my problem? Signal strength? amplified? little do-dads?
:alien
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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1303Steve
A.k.a.: Steve Carter
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| posted on May 3rd, 2004 at 10:39 PM |
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Hi Pete
Call Barry at St George Instrument Services Pty Ltd
91 Planthurst Rd Carlton NSW 2218
ph: (02) 9547 0855
he converted my tacho to work with electronic ignition.
1302Steve
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speedster356
A.k.a.: Peter Mcleod
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| posted on May 3rd, 2004 at 10:50 PM |
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Great stuff Steve thanks, I'm on to it tomorrow!
I love this site.:thumb
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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Transparu
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| posted on June 6th, 2004 at 07:44 AM |
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For an easy ( answer that will cost maybe $2, have a look at:
http://autos.groups.yahoo.com/group/subaruvanagon/files/Wiring%20/
And then download TachWiringDiagram.jpg.
This worked for me with EJ22 in a Transporter and Transporter Tach . . same system for 6 cyl, but another diode for the third pair of HT signals.
Dave
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pete wood
A.k.a.: figure itout
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| posted on June 7th, 2004 at 06:23 PM |
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Dave
love to see this wiring diagram. I have an EJ25 in a J&S buggy and the speco tach I have is not working either.  However, I am not a member (you need to be to access the file), and the group
only allows membership to those putting subies in kombis. :repuke
Could you please upload the diagram onto the forum for us.
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speedster356
A.k.a.: Peter Mcleod
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| posted on June 7th, 2004 at 06:39 PM |
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Barry was not much help, but a friend sent me this for a Nissan so I'm going to try it. It should work. Just passed on to Barry at St George and he
has many uses for it........!
Just use 1/3rd of the circuit.
[Edited on 7-6-2004 by speedster356]
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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pete wood
A.k.a.: figure itout
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| posted on June 8th, 2004 at 05:07 PM |
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Thanx Peter
Thanx for the diagram. Looks really simple to make. 
Got some questions about the diagram though.
What sort of engine is the diagram for?
It looks like a V6 with a waste spark set up.
Is that correct?
Is it meant to have one pulse per coil pack or what?
I have an EJ25, would I set it up with two of the units (instead of the three in the diagram), that is, one per coil pack?
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Transparu
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| posted on June 8th, 2004 at 07:22 PM |
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Diode method
Sorry, Couldn't work out how to include a file. . Here is the two diode method from the Vanagon list.
Incidentally, there is no difficulty in joining the group .. and there is a huge quantity of material there in files, photos and the forum itself
Dave
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| Sorry, you must be a registered user in order to download attachments. |
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pete wood
A.k.a.: figure itout
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| posted on June 8th, 2004 at 08:29 PM |
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Thanx heaps man! :kiss
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pete wood
A.k.a.: figure itout
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| posted on June 11th, 2004 at 03:51 PM |
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Just hooked it all up as per Transparu's diagram.
The tacho was only showing half the RPM until we changed the switch from 8 Cyls to 4 Cyls. (ok, maybe we were being optimistic)
Now it works like a treat, :thumb
Thanx guys
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pete wood
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 posted on June 20th, 2004 at 03:49 PM |
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mmm, a slight revision
the tacho is only reading 4200rpm when the engine is bouncing off the rev limiter. Kinda weird. Any ideas?:o
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type2nut
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| posted on December 16th, 2004 at 08:04 PM |
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Did you ever work out why Pete?
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choppa
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| posted on December 17th, 2004 at 12:02 AM |
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Just my 2 cents worth.
I did a ej20t into my notch about 6 years ago and it plugged straight up to the factory ecu and worked fine.
What was it?
Autometer Sport Comp.
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pete wood
A.k.a.: figure itout
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| posted on December 17th, 2004 at 07:37 AM |
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| Quote: | Originally
posted by type2nut
Did you ever work out why Pete?
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yep, All good now, it was the same switch we had issues with before. one of the wires had wrapped around it inside the housing and pulled it across to
the 6cyl position, moved the wire and it's fine now. 
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seagull
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| posted on July 21st, 2005 at 07:56 PM |
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needs a bump , this should not be lost can we put it on file some place ?
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seagull
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| posted on July 24th, 2005 at 10:34 PM |
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Bump for Jenny
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Jenny
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| posted on July 25th, 2005 at 09:10 AM |
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Hi Neil,
for the two diodes used in the circuit posted by Transparu you should be able to use something like 1N4004, rated at 1A/400V and only about $0.10 each
from Dick Smith or Jaycar or Radio Spares, etc. Just make sure when you splice/solder it into the line that you have the end with the band around it
pointing in the direction of the arrow in the circuit (towards the tacho in this case) and make sure you use heatshrink or other waterproof insulation
over the joins and diodes so it can't short out.
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seagull
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| posted on July 31st, 2005 at 08:57 PM |
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for hellbus
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 helbus
A.k.a.: Pete S
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| posted on July 31st, 2005 at 09:02 PM |
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I read this and it hurts my head. I can make anything out of steel, bolts and welds, but this stuff bows my mind. I will just take a printout of the
diagram and my tacho to a whizz bang geeko electronics guy I know.
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seagull
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| posted on July 31st, 2005 at 09:09 PM |
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I need one as well it would cost like $0.25 for the bits
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seagull
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| posted on August 5th, 2005 at 02:16 AM |
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I tryed this set up to night on my ej20 quad cam > it did not work
:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry:cry
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Jenny
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| posted on August 5th, 2005 at 07:03 AM |
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Oh dear, the only thing I can suggest is that you double check your connections because it should work. Have you confirmed that your loom's wiring
agrees with the diargam eg yellow/red & red/green go to coil for 1&2 with blue & red/green going to coil for 3&4? If they are as per the diagram above
then are you sure you have the correct connections at the tacho? If you're positive you have everything wired correctly then you could try some
experimenting, eg disconnect the diode from the blue wire and connect it to the yellow/red wire to see if it makes any difference.
If all else fails, drink more beer...and you may see the light.
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seagull
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| posted on August 6th, 2005 at 09:33 PM |
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My ignitor has more wires than the three shown > the coil pack on my motor has three wires of these one is earth how can I go wrong ?
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seagull
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| posted on August 6th, 2005 at 10:54 PM |
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nope dont work ! :jesus:jesus:jesus:jesus:jesus:jesus:jesus:jesus:jesus:jesus:jesus:jesus:jesus:jesus:jesus:alien
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seagull
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| posted on August 6th, 2005 at 10:55 PM |
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I sort of look just like that now !
were is some were high so I can jump off !
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seagull
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| posted on August 7th, 2005 at 12:50 PM |
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I have now connected ( one ) wire the rpm is working but not to full rpm .If I connect the other wire the rpm on the gauge goes to 0.
so what in hells name is going on now ?
the dip switches on the vdo gauge are correct .
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pete wood
A.k.a.: figure itout
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| posted on August 7th, 2005 at 02:36 PM |
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Start doing some continuity testing. Make sure you don't have a bad connection somewhere, easy to overlook.
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seagull
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| posted on August 7th, 2005 at 02:44 PM |
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yep on that , I check the connectors , cheers
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Jenny
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| posted on August 8th, 2005 at 08:05 AM |
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In the abaove diagram the red/green wire on the coil pack is 'common' but this does not necesarily mean it is at earth potential.
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seagull
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| posted on August 9th, 2005 at 12:55 AM |
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I have had it with this ecu and just about to pull it out and run it over with my 4x4 its a pain in the ass !
Looking for that special lady : PM me for coffee & cake
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