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Gtir Motorsport club » Tech room » Help and Advice » Tacho input

Tacho input

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1Tacho input Empty Tacho input on 31st May 2015, 1:05 am

gtir_woody

gtir_woody
moderator
moderator
Does anyone know what signal input the cluster gets to operate the tacho? Is it either 5,8 or 12v?

2Tacho input Empty Re: Tacho input on 2nd June 2015, 2:24 am

gtir_woody

gtir_woody
moderator
moderator
No idea? Smile

3Tacho input Empty Re: Tacho input on 2nd June 2015, 7:26 am

Stu

Stu
Admin
Admin
I dont know sorry mate.


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4Tacho input Empty Re: Tacho input on 2nd June 2015, 9:00 am

johnboy

johnboy
Don't know if this helps. Seems to say between 1 and 5 volts but as it will be pulses that doesn't mean a lot. My guess would be 5v peak??

Tacho input Circuit_zpsh7q29hgl

5Tacho input Empty Re: Tacho input on 2nd June 2015, 11:24 am

gtir_woody

gtir_woody
moderator
moderator
Thanks mate, that's helpful. I'll do a little searching and post what I figure out Smile

6Tacho input Empty Re: Tacho input on 2nd June 2015, 11:32 am

joetheeskimo

joetheeskimo
Probably PWM signal isnt it, or a variable frequency square wave.

7Tacho input Empty Re: Tacho input on 2nd June 2015, 11:38 am

gtir_woody

gtir_woody
moderator
moderator
I thought I read somewhere the cluster changes the signal type and then sends it to the ecu, can't confirm that though.

8Tacho input Empty Re: Tacho input on 2nd June 2015, 12:31 pm

johnny gtir

johnny gtir
moderator
moderator
That rings a bell somewhere in my grey matter woody

9Tacho input Empty Re: Tacho input on 2nd June 2015, 9:39 pm

gtir_woody

gtir_woody
moderator
moderator
Yeah Im almost positive I've seen it somewhere johnny. Correction in the above though, the tacho gets a signal from the ECU, and the ECU gets the signal from the CAS.

10Tacho input Empty Re: Tacho input on 2nd July 2015, 7:55 am

gtir_woody

gtir_woody
moderator
moderator
Found out its 5v, duty cycle 20% and 4 pulses per cycle by looking up the haltech plug and play map.

Also the speedo is 1225 pulses/ km for the ecu.

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