Author Topic: Gas Tacho / Revcounter Conversion to Diesel W terminal  (Read 166425 times)

Reply #105February 22, 2011, 05:26:14 am

ToddA1

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #105 on: February 22, 2011, 05:26:14 am »
Has anyone else completed jimbote's method with the Ford VSS?  Something I didn't see mentioned was how far apart the nuts added to the crank pulley need to be.  I'm sure the closer to the center they are, the higher the rpm would read.

-Todd

Reply #106March 15, 2011, 05:12:57 pm

jimbote

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #106 on: March 15, 2011, 05:12:57 pm »
Has anyone else completed jimbote's method with the Ford VSS?  Something I didn't see mentioned was how far apart the nuts added to the crank pulley need to be.  I'm sure the closer to the center they are, the higher the rpm would read.

-Todd

Todd...the nuts need to be at the edge of the pulley so they can induce a current in the pickup....it will make no difference in RPM whether they're near the center or on the edge....just two pulses per revolution is all that matters...but they must be positioned so they sweep very closely to the sensor....are you having an issue mounting them at the edge?

Reply #107March 15, 2011, 05:23:21 pm

ToddA1

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #107 on: March 15, 2011, 05:23:21 pm »
No issues with mounting them, but I wanted to know before I mounted them....  just in case.

I forgot to order than sensor with my last parts order, but it'll get done.  I want an actual tach signal for my remote starter....  I don't like relying on voltage sensing.

Thanks.

-Todd

Reply #108May 22, 2011, 10:43:46 pm

Powered by Spearco

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #108 on: May 22, 2011, 10:43:46 pm »
I just wanted to say thanks for the info on the Ford sensor. It works on my Autometer tach.
'87 Syncro Transporter Single Cab "Now TDI"
'78 Rabbit..Gas Weekend Racer
'81 Caddy..Diesel 1.6/1.9 TD hybrid 275HP 349TQ "Retired"
'90 MultiVan, 2.5 Suby Swap, Porsche Brakes
'76 Scirocco TD dragster project
'13 Golf R:. Tuned
'98 Puch G320

Reply #109August 13, 2013, 10:36:29 pm

srgtlord

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #109 on: August 13, 2013, 10:36:29 pm »
I just read through this entire thread and could not find anything that came close to the tach that came out of the 85 gas golf I have...

[/URL

I did however notice the first tach picture has the same number of components. ANy help would be greatly appreciated

Reply #110August 15, 2013, 07:25:31 am

RabbitJockey

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #110 on: August 15, 2013, 07:25:31 am »
most of them have pretty similar schematics, take a picture of the other side of the board so we can see the traces.
98 Pontiac Grand Prix GT:stock daily
 81 Jetta: in progress 1.6td, ported head, holset turbo.
81 Rabbit:AAZ, hybrid T3 turbo, Giles pump, lightened fw, and yellow clutchnet clutch.

Reply #111August 15, 2013, 07:55:07 am

srgtlord

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #111 on: August 15, 2013, 07:55:07 am »
Ill take a picture, but I think I figured it out. This has an almost identical set of components to the first VDO gasser tach in the thread. I started tracing components and resistors and there are only 2 resistors that are different, one is 200 ohms and the other is 16 kilo ohms on my board. I do beleive the 16 kilo ohms coincides with  r5 which has a dunno as the resistance label. The 200 ohm coincides with 162.

Ill double check on the capacitors but it looks like they are all the same. Its odd how VW decided to change the two resistors.
I think by following the conversion schematic for the first VDO gauge I should be in the ballpark of a working tach.

Reply #112August 15, 2013, 11:57:13 am

RabbitJockey

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #112 on: August 15, 2013, 11:57:13 am »
basically if you can make what u have match the td circuit that regcheeseman posted then it should work, i've done it before on boards no one had converted, i think i posted one a few pages back
98 Pontiac Grand Prix GT:stock daily
 81 Jetta: in progress 1.6td, ported head, holset turbo.
81 Rabbit:AAZ, hybrid T3 turbo, Giles pump, lightened fw, and yellow clutchnet clutch.

Reply #113August 15, 2013, 12:38:29 pm

srgtlord

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #113 on: August 15, 2013, 12:38:29 pm »
Thats exactly what I was thinking :) Looks like Ill be starting in on this tonight 

Reply #114September 16, 2013, 05:17:33 pm

CrAzY_DrIveR

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #114 on: September 16, 2013, 05:17:33 pm »
As crewcabcaddy said just conecting the ecu signal directly works pretty well.
Now that this is done can anyone help me with my speedometer conversion? :)

http://www.vwdiesel.net/forum/index.php?topic=33926.msg319201#msg319201

video of the tachometer

http://youtu.be/LWae5V6T1gw



Uploaded with ImageShack.us
'80 Rabbit TDI Project - www.mk1tdi.blogspot.com - ARL PD300 in progress...
'89 BMW 324td

Reply #115October 20, 2013, 04:12:36 pm

R.O.R-2.0

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #115 on: October 20, 2013, 04:12:36 pm »
I just read through this entire thread and could not find anything that came close to the tach that came out of the 85 gas golf I have...

[/URL

I did however notice the first tach picture has the same number of components. ANy help would be greatly appreciated

That dont look like a VDO tach, it looks like a Moto-Meter, and they are 100% different..
92 Jetta GLI - Black, 1.6D w/ GT2056V turbo..
86 GTI - 4 Door, Med Twilight Gray, Tow Machine..
86 Audi Coupe GT - Tornado Red, All Stock.. WRECKED.
89 Toyota 4Runner - Dark Grey Metallic, LIFTED!

Turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.

Reply #116October 21, 2013, 03:56:43 pm

srgtlord

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #116 on: October 21, 2013, 03:56:43 pm »
Well believe it or not..IT WORKS! and yes this is a 1985 gasser VDO tach
« Last Edit: October 21, 2013, 03:58:58 pm by srgtlord »

Reply #117October 25, 2013, 11:10:48 am

RabbitJockey

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #117 on: October 25, 2013, 11:10:48 am »
they all look a bit different, but they are all quite similar, and they are all very simple circuits.  it would be quite easy to just build the board yourself if so long as you could find the correct chip.
98 Pontiac Grand Prix GT:stock daily
 81 Jetta: in progress 1.6td, ported head, holset turbo.
81 Rabbit:AAZ, hybrid T3 turbo, Giles pump, lightened fw, and yellow clutchnet clutch.

Reply #118October 25, 2013, 11:11:31 am

RabbitJockey

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #118 on: October 25, 2013, 11:11:31 am »
actually can you confirm all the numbers on that chip????

specifically sn29736p?????
98 Pontiac Grand Prix GT:stock daily
 81 Jetta: in progress 1.6td, ported head, holset turbo.
81 Rabbit:AAZ, hybrid T3 turbo, Giles pump, lightened fw, and yellow clutchnet clutch.

Reply #119October 25, 2013, 12:56:18 pm

srgtlord

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #119 on: October 25, 2013, 12:56:18 pm »
Unfortunately the only picture I have is the one I posted and the tach is currently installed in the car at the moment :(  When I go to calibrate the tach Ill pull the tach out of the cluster to get another look at the part number but this probably wont happen until spring.....