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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: testing Jaycar HEI tach signal for Megasquirt
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Fri, 10 December 2004 12:41
 
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well, tach signals are prone to noise from both spark plug wires and other sources of noise like alternator (but are usually far away from them)
i don't think a tachometer has as much of a problem with signal noise, but it does depend on the type of signal it gets.
i found that even running a 1K resistor caused my KE15 tacho to function intermittently and the needle dropped often.. so addign a resistor reduces the size of the signal, and the effectiveness of the tacho.
for the ECU, it depends on the type of signal it is expecting..
if it expects a clean 12V squarewave, and it gets a coil -ve input, it will likely need a bit of conditioning..
i am not running a shielded wire to my tacho, but i am to the ECU.
CYa, Stewart
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| | Subject | Poster | Date |
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testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Fri, 10 December 2004 05:52 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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IRA11Y | Fri, 10 December 2004 06:09 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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RA40Celica | Fri, 10 December 2004 06:15 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Fri, 10 December 2004 06:41 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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TA-022 | Fri, 10 December 2004 11:32 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Fri, 10 December 2004 12:41 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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RA40Celica | Fri, 10 December 2004 23:13 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Sat, 11 December 2004 02:29 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Mon, 13 December 2004 03:57 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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gearb0x | Fri, 10 December 2004 12:52 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Fri, 10 December 2004 12:58 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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gearb0x | Fri, 10 December 2004 13:15 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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RA40Celica | Mon, 13 December 2004 23:31 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Tue, 14 December 2004 06:09 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Tue, 14 December 2004 06:12 |
