Bizarro
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| posted on 7/8/12 at 10:28 AM |
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Smiths Telemetrix tacho + megasquirt
Im using a Megasquirt that has a tacho output connected to a Smiths Telemetrix tacho.
I have successfully started the car and have it ticking over but do not get anything on the tacho. Using the search facility on the forum I have found
a post saying tacho out from a Megajolt does work with a Smiths gauge without modification.
Before I look into modifying with resistors/relay or driving the tacho from the coil pack has anybody successfully used the 'tacho out'
from a megasquirt with smiths telemetrix gauge? Dont want to spend time messing around if there is a simple solution!
Cheers
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MikeRJ
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| posted on 7/8/12 at 11:14 AM |
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What ignition system are you using, built in drivers or an EDIS unit?
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Bizarro
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| posted on 7/8/12 at 11:29 AM |
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quote:
Originally posted by MikeRJ
What ignition system are you using, built in drivers or an EDIS unit?
Ford zetec coil pack driven directly from Megasquirt, not using EDIS.
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big-vee-twin
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| posted on 7/8/12 at 12:13 PM |
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Have you built the amplifier circuit, as the MS board does not have the correct output to drive a tacho direct, you have to build a transistor circuit
inbetween the MS and guage.
Personally I have not heard many have success driving a tacho from MS so I chose to drive mine direct from the coils using the below circuit, the
guage worked immediately the engine started.
I'm using Smiths Classic guages
[img]
 
tachometer diodes
[/img]
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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Bizarro
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| posted on 7/8/12 at 02:36 PM |
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quote:
Originally posted by big-vee-twin
Have you built the amplifier circuit, as the MS board does not have the correct output to drive a tacho direct, you have to build a transistor circuit
inbetween the MS and guage.
Personally I have not heard many have success driving a tacho from MS so I chose to drive mine direct from the coils using the below circuit, the
guage worked immediately the engine started.
I'm using Smiths Classic guages
[img]
tachometer diodes
[/img]
OK thanks, just ordered some diodes and Ill give it a go.
Silly me thinking it would be as easy as connecting the wire marked 'tacho out' to the tacho and it would work!!
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big-vee-twin
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| posted on 7/8/12 at 04:44 PM |
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The output of the circuit is the same as if you took the pulses from a single coil so set your tacho to 4 cylinder single coil
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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