VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: Smokey Eddy on November 14, 2008, 01:03:46 am
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Could an oscilloscope be used to determine the conversion needed to make a universal converter controller that will make any gasser aftermarket tach work off the "W"?
I have an oscilloscope and some knowledge on signals, frequencies, electronics and programing but i just am unfamiliar with what the "w" signal actually is...
is it the frequency of the alternator doing 1 complete revolution?
I feel confident i could program a controller to do this that you would simply add to the alternator to make it usable for aftermarket tachs.
but i need to know what im dealing with off the bat. If anyone could explain what the W signal is I'd appreciate it. I don't want to get into schematics of the alt. and all that if someone already knows.
Thanks! I hope i produce something useful.
If no one knows i can figure it out but it would save me a lot of time if someone already knew. Thought i'd ask.
I have NOT looked for vw vortex for something like this.
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Dude, check out the Dakota Digital diesel tach modules. Cheap & easy.
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you will end having a converter box in the end some should have the link to roger brown's site that should answer all your questions ! i have one of his kit also he sells them!
Duane
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http://www.vwdiesel.net/phpBB/viewtopic.php?t=13499&highlight=terminal
for starters. :wink:
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Ooooooooooooo
thanks guys
hahaha
(would still be neat to see it on the scope)
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I'm thinking now after reading your thread vince, that there is something screwy with my W terminal....
when contacted with my tach it reads nothing. If i graze the terminal with the wire the tach will flutter about. At no setting on my tach will it read something useful. What does this sound like?
I just thought the W was putting out something totally un-usable. Not just simply different V and frequency.
Is my alt. unusable?
ps. I've seen the digi ones before but i already have the tach and i wouldn't want a digital read out. numbers are so arbitrary and deceiving.
pps. I did use the search on here and i couldn't find anything useful...
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this probably wont help..but I thought I would throw it out there...I have to goose my accelerator pedal to get my W terminal to read..basically you need to "excite the alt" on my car...the guys on here say that normal....mine has to be "excited" every time I turn the car off and then back on...does not matter if it's warm or cold...
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so when you're idling at a light it will read 0? :?
i think im confused...
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so when you're idling at a light it will read 0? :?
i think im confused...
when I start the car it reads zero until I step on the gas pedal...then it reads after that...but it reads low..
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oohh
weird... I never tried that i just tried to get an idle to read. I'll have to try that when i put it back together. You use a converter or a VDO diesel tach?
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oohh
weird... I never tried that i just tried to get an idle to read. I'll have to try that when i put it back together. You use a converter or a VDO diesel tach?
yeah that would suck if it just needed to be "excited" and you didn't know..
I'm running a motometer diesel cluster with stock tach....mine came from Tyler in Canada so it's KPH right now...but I'm gonna swap in my old MPH speedo...soon