tach wire input

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Dl334

Member - Posts: 3

Joined: September 15, 2002

Location: United States

Posted: October 05, 2002 at 1:21 AM / IP Logged

Does anyone know about the tach wire input read. Do it read AC volt, AC pluse, and from what level does it read to how high. please help.

dl

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Montrealler

Copper - Posts: 155

Joined: October 05, 2002

Location: Canada

Posted: October 05, 2002 at 1:43 AM / IP Logged

its an alternative square wave

if you may be more specific for the use of this info i could perhaps help.

usually CAR STARTER OR CRUISE controll unit count the number of pulse that is read in a period of time

if your engine have only 1 coil and 4 cylinders and is turning 800 rpm

the tach will probably be 3200 pulses per minutes

1 full turn is 4 explosion so 800 turns x 4 firing = 3200 pulses for 800 rpm

for the voltage it vary a lot so must check to know

Yes I'm Back 2006...

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Sound Pressure

Silver - Posts: 711

Joined: March 09, 2002

Location: United States

Posted: October 05, 2002 at 2:36 AM / IP Logged

Your tach wire should read between 1-6 volts.

Sound Pressure

You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!

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Glynn

Member - Posts: 36

Joined: June 27, 2002

Location: New Zealand

Posted: October 05, 2002 at 5:13 AM / IP Logged

We usually set our meter to AC volts. Then look for a wire that sits around 1 to 4 volts around 800rpm. It should then increase smoothly as the rev's increase-as did the one today.

Friends VW Golf today sat at 4volts @800rpm. 7 volts @ 3000rpm.

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tach wire input

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