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General Information => FAQ/Tech Tips/Please Read First => Topic started by: bgrunhaus on August 01, 2012, 11:42:03 pm
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Hello guys!
i belive in giving, you know, you've gave me so much(the forum and all of your contributions)
here's the info:
i want a tach on my diesel! dont we all?
i started reading and reading and reading and didnt find anything concrete!
so i decided to do it myself
i had a Crankshaft position sensor of a VR6, found the pinout online and is like this
with the two notches pointing up terminals are 1 2 3
1: 12v input
2: tach output(here you connect the tach)
3: ground
so as instructed you have to provide the 12v( better to be switched, so take it from the shut off solenoid), the ground from wherever and send a cable from the tach to the #2 terminal on the plug of the CPS.
add two nuts to the damper, welded glue whatever you like, build a bracket and that's it!
there you go!
here's a video! it's in spanish but is self explanatory! http://www.youtube.com/watch?v=DpT7qOaRco0 (http://www.youtube.com/watch?v=DpT7qOaRco0)
let me know what you think!
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http://www.vwdiesel.net/forum/index.php?topic=30442.0 (http://www.vwdiesel.net/forum/index.php?topic=30442.0)
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i built that a LONG time ago..
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Very well done, on both accounts. They will BOTH be added to the FAQ sticky. Kev, you probably weren't the first ever ;)lol.
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Very well done, on both accounts. They will BOTH be added to the FAQ sticky. Kev, you probably weren't the first ever ;)lol.
not saying i was the first.. but i was one of the first to openly confirm that it works.. and that it is very easy to accomplish..
i KNOW i was not the first, because ford used to drive their tachs off a mag pickup as well..
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Is not that hasn't been done till now! You did it and probably a lot of guys out there have solutions too!
my contribution here is to give detailed instructions on how to wire the sensor and where to source it.
i stated that i used a volkswagen VR6 crankshaft position sensor but thinking about it the CPS of an ABA engine can be used too!
ill post an update as soon as I get the cluster tach(the cluster was changed by the PO, it now has a gas cluster) working!
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So that would power the green wire of any typical gas tachometer correct? Coooolio :)
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So that would power the green wire of any typical gas tachometer correct? Coooolio :)
same thing with the one i built Jer.. negative side of coil to ground. positive side to tach exciter wire.. cool thing about a mag pickup, is you cant wire it wrong..
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So this will drive a gasser mk2 tach for sure???
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So this will drive a gasser mk2 tach for sure???
in a round about way.. ive never gotten my sensor working with a stock mk2 tach.. someone has tho..
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So this will drive a gasser mk2 tach for sure???
in a round about way.. ive never gotten my sensor working with a stock mk2 tach.. someone has tho..
I'm not much with electronics. Does it require some sort of way to increase/decrease voltage or amperage/change frequency?
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So this will drive a gasser mk2 tach for sure???
in a round about way.. ive never gotten my sensor working with a stock mk2 tach.. someone has tho..
I'm not much with electronics. Does it require some sort of way to increase/decrease voltage or amperage/change frequency?
i dont know dude.. ive never gotten my setup working with a stock mk2 tach..
i remember something about having to use a magnetic pickup, and magnets to signal it from the crank..
just a chunk of steel doesnt make enough of a voltage spike to signal the stock tach..
that is all i know about it for now. i know mine works great with my 4" autometer tach..
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only reason i care so much i can get a gas cluster for a dime a dozen diesel way more $$$
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only reason i care so much i can get a gas cluster for a dime a dozen diesel way more $$$
dakota digital tach converter..
hook the W terminal from your alt up to it, hook the green wire from it to your tach..
adjust tach for correct reading..
done deal.
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Very well done, on both accounts. They will BOTH be added to the FAQ sticky. Kev, you probably weren't the first ever ;)lol.
not saying i was the first.. but i was one of the first to openly confirm that it works.. and that it is very easy to accomplish..
i KNOW i was not the first, because ford used to drive their tachs off a mag pickup as well..
dang.... look what I found :D .... post 29!!.... http://www.vwdiesel.net/forum/index.php?topic=3741.15
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i believe im going to play around with my setup a bit more today..
see if i cant get a tach reading from my cluster..
i know the cluster is good..
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i used the crank pickup on my 1z mtdi ,its in a gasser 2.5 t4 transporter ,but now a mtdi wired up the sencer power from pump sol, and run the wire from no 2 pin to the gas taco , and have my aftermarket diesel taco on to the w T , to compare gass taco on idle, reads 900rpm and the W one reads 650rpm m van dose ldle low. and gaser at 3000rpm W at 2000rpm , tryed a small capacitor in line from no 2 pin then a bit biger one ,just the same , need some way to get the frequency down . i am not in to electronics things bobers, but some one may be able to shed some light on this .
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you positive your diesel tach is accurate?
i would lean more towards the gasser tach being accurate...
if its raining too hard, the diesel tach is in-accurate, and thats not cool..
my old audi 5000TD, the tach would quit working whenever you hit a puddle in the road..
then the belt would dry, and the tach would come back to life..
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The crank sensor on the AHU/1Z will give four pulses per rev. The gasser 2.5 (5-cyl) tach will be looking for 2.5 ignition pulses per rev and thus the discrepancy. A gas 4 cyl tach is looking for 2 pulses per rev. I've been planning on using a flip-flop to cut the crank sensor output in half in order to drive a typical 4-cyl gasser tach.
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The crank sensor on the AHU/1Z will give four pulses per rev. The gasser 2.5 (5-cyl) tach will be looking for 2.5 ignition pulses per rev and thus the discrepancy. A gas 4 cyl tach is looking for 2 pulses per rev. I've been planning on using a flip-flop to cut the crank sensor output in half in order to drive a typical 4-cyl gasser tach.
whats this flip flop you are talking about?
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It's one of the most basic logic circuits.
http://en.wikipedia.org/wiki/Flip-flop_%28electronics%29
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After reading some of that I short circuited. lol.. What would one use to implement a flip flop circuit to do what your describing to cut the 4 pulse signal into 2?
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I've been planning on using a flip-flop to cut the crank sensor output in half in order to drive a typical 4-cyl gasser tach.
Well it might be this type of flip flop. (http://i1087.photobucket.com/albums/j475/Orcoaster/Diesel-Flip-Flops-.jpg)
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aaa some info there would this flip flop do http://www.ebay.co.uk/itm/FLIP-FLOP-D-TYPE-SMD-74LVC1G175-Part-SN74LVC1G175DBVT-/390460792223?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item5ae946dd9f
or can i buy a set up ready to go , we have maplines , and rs hear , no rado shack :)
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I'm not particularly electronics savvy, but I think that would work wired correctly.
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anyone have any idea about modifying the stock mk2 tach to accept a signal from a mag pickup?