Author Topic: alternator reading for RPM  (Read 2142 times)

September 18, 2008, 12:15:18 pm

cpv

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alternator reading for RPM
« on: September 18, 2008, 12:15:18 pm »
Hi, i had to recently swap my accesory transmision from a V belt to a 6PK from AAZ, in order to fit the AC compressor, and now the new alternator from the AAZ is speenig faster because it has a samller pulley, and as a result the Rpm reading is much higher on the dash,
can the dash be calibrated or the only way is to fabricate a new 6PK pulley with the correct diameter?

Reply #1October 01, 2008, 12:26:04 pm

Smokey Eddy

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alternator reading for RPM
« Reply #1 on: October 01, 2008, 12:26:04 pm »
If you're exceptionally good with electronics i've heard of geniuses making a converter chip where it recieves the frequency from the W and then just multiplies or divides it accordingly. But ... there is an enormous amount of know-how involved with that.
Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
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Reply #2October 01, 2008, 12:42:45 pm

Smokey Eddy

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alternator reading for RPM
« Reply #2 on: October 01, 2008, 12:42:45 pm »
That sounds a heck of a lot easier :P
Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD

Reply #3October 01, 2008, 03:24:36 pm

allsierra123

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alternator reading for RPM
« Reply #3 on: October 01, 2008, 03:24:36 pm »
Will the W post on the alternator work with the gas Tach? It looks as If I have one on my alternator.

Reply #4October 01, 2008, 03:43:47 pm

gigaz2

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alternator reading for RPM
« Reply #4 on: October 01, 2008, 03:43:47 pm »
you can find instructions on how to convert gasser tachs to work on the W signal
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Reply #5October 01, 2008, 05:00:54 pm

Smokey Eddy

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alternator reading for RPM
« Reply #5 on: October 01, 2008, 05:00:54 pm »
THAT is what i was refering to with the electronics and what not.
I'm trying to make an aftermarket tach convert to a W signal.
If you have a VDO one people on here have definately posted invaluble guides on converting them.
Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD

Reply #6October 01, 2008, 05:37:07 pm

allsierra123

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alternator reading for RPM
« Reply #6 on: October 01, 2008, 05:37:07 pm »
I was just going to use the dakota signal converter box looked a lot easier.