Tach filter ?
Pro
Joined: Dec 2000
Posts: 560
Likes: 0
From: Camino CA
Re: Tach filter ? (Stevo)
It filters out the electrical spikes so that your tach goes up and down smoothly instead of bouncing. They always seem to go bad when you change something with the ignition. If you get weird readings on your tach, like it stops at a certain spot you can just cut out the tach filter and reconnect the wires.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Re: Tach filter ? (Ben Taylor)
If you remove the tach filter, your tach will most likely start jumping around in various rpm ranges, and act screwey, and or false readings....sometimes way off....WAY off....
needs that filter because of the various ringing in the ignition circuit...
there is a schematic published here on forum by someonw else, some years ago...
do a search....
GENE
needs that filter because of the various ringing in the ignition circuit...
there is a schematic published here on forum by someonw else, some years ago...
do a search....
GENE
Pro
Joined: Dec 2000
Posts: 560
Likes: 0
From: Camino CA
Re: Tach filter ? (mrvette)
Here's the post with the scematic that mrvette was talking about.
http://forums.corvetteforum.com/zerothread?id=136220
http://forums.corvetteforum.com/zerothread?id=136220
Le Mans Master
Joined: Jan 2001
Posts: 6,938
Likes: 1
From: San Diego CA
Re: Tach filter ? (Ben Taylor)
I thought the tach filter was something on the tranny 
I didn't quite follow where it is. Could the ground now on the aluminum manifold screw it up (not a steel ground connection to the frame) ??
I didn't quite follow where it is. Could the ground now on the aluminum manifold screw it up (not a steel ground connection to the frame) ??
Melting Slicks
Joined: Oct 1999
Posts: 2,581
Likes: 14
From: Tolar Texas
Re: Tach filter ? (Ben Taylor)
Here's the post with the scematic that mrvette was talking about.
http://forums.corvetteforum.com/zerothread?id=136220
http://forums.corvetteforum.com/zerothread?id=136220
Obviously this is not the way to go if your trying to maximize your NCRS points standing. :D
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Thread Starter
Pro
Joined: May 2002
Posts: 726
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From: Petaluma CA
Re: Tach filter ? (MIKER)
This looks like the way to go...I can't see the pix well enough...can you post info of resistor and capacitor values or part numbers? Maybe even a soldering diagram or explanation? Pic looks like it is all soldered too close to see...thanks again.
Melting Slicks
Joined: Oct 1999
Posts: 2,581
Likes: 14
From: Tolar Texas
Re: Tach filter ? (Stevo)
The resistors came in packs of 5
and the capacitors came in packs of two.
All that is needed is
1- 0.1uF Ceramic Disc Capacitor
1- 100pF Ceramic Disc Capacitor
1- 10K ohm resistor
1- 5.6K ohm resistor
While following the electrical diagram that Smokehouse69 provided, twist
them together, and solder it all together along with the wires that go to
the distributor, tach, and ground. Cover with shrink wrap and you are done!
and the capacitors came in packs of two.
All that is needed is
1- 0.1uF Ceramic Disc Capacitor
1- 100pF Ceramic Disc Capacitor
1- 10K ohm resistor
1- 5.6K ohm resistor
While following the electrical diagram that Smokehouse69 provided, twist
them together, and solder it all together along with the wires that go to
the distributor, tach, and ground. Cover with shrink wrap and you are done!
Drifting
Joined: Feb 2002
Posts: 1,987
Likes: 3
From: Manchester, Dead Center in the Middle of TN 25 miles to Jack Daniels,10 miles to Geo Dickle, and .8 mile from the Liquor Store at I-24 Exit 114
St. Jude Donor '05
Re: Tach filter ? (Cali,77,L-82)
.....................and what about all of the thousands of Monte Carlos and Camaros with factory tachs, won't they work too? JIM :confused:
[Modified by PROSOUTH, 7:11 PM 7/14/2002]
[Modified by PROSOUTH, 7:11 PM 7/14/2002]
Drifting
Joined: Feb 2001
Posts: 1,603
Likes: 0
From: San Francisco, CA
Re: Tach filter ? (Schmucker)
TTT- I would like to know too as my tach does some jumping at the higher rpm's Is the filter the thing that looks like a condensor in the picture and where is it found under the hood?
Melting Slicks
Joined: Aug 2001
Posts: 2,753
Likes: 1
From: Fishkill NY
Re: Tach filter ? (MIKER)
Hay MIke..
Is that a .1 uF or a .1mF you got? The diagram calls for a .1 mF and I think there is deference between them.
BY the way, were did you get the connectors from, Radio Shack? If so do you have the radio Shack part numbers?
[Modified by SLICKMAN, 9:37 PM 7/14/2002]
Is that a .1 uF or a .1mF you got? The diagram calls for a .1 mF and I think there is deference between them.
BY the way, were did you get the connectors from, Radio Shack? If so do you have the radio Shack part numbers?
Here's the post with the scematic that mrvette was talking about.
http://forums.corvetteforum.com/zerothread?id=136220Here are some pics of the home built tach filter. I know the pics are crummy but at the time I was making due with a primitive digital camera.
Obviously this is not the way to go if your trying to maximize your NCRS points standing. :D
http://forums.corvetteforum.com/zerothread?id=136220Here are some pics of the home built tach filter. I know the pics are crummy but at the time I was making due with a primitive digital camera.
Obviously this is not the way to go if your trying to maximize your NCRS points standing. :D
[Modified by SLICKMAN, 9:37 PM 7/14/2002]
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 98
From: Ontario
Re: Tach filter ? (Schmucker)
Schmucker,
Another pic to complement my original above. The filter has been painted since but here is the location: the small, black cylinder in the centre of the pic.
Another pic to complement my original above. The filter has been painted since but here is the location: the small, black cylinder in the centre of the pic.
Intermediate
Joined: Feb 2002
Posts: 36
Likes: 0
From: belleville wi
Re: Tach filter ? (SLICKMAN)
The symbol in the diagram is MF which is the same number as uF.
This is not the same as mF.
MF and uF means .000001 Farads
mF means milliFarads which is .001 Farads.
Sometimes in diagrams they like to use a big M instead of a u.
The moral to the story is that the capacitor value is .1 uF
hope this helps. :reddevil
This is not the same as mF.
MF and uF means .000001 Farads
mF means milliFarads which is .001 Farads.
Sometimes in diagrams they like to use a big M instead of a u.
The moral to the story is that the capacitor value is .1 uF
hope this helps. :reddevil