Author Topic: Gas Tacho / Revcounter Conversion to Diesel W terminal  (Read 138684 times)

Reply #60February 25, 2009, 09:10:04 am

jimbote

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Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #60 on: February 25, 2009, 09:10:04 am »
Just wondering if anyone else has tried my "ford inductive" tach driver method.....also wanted to report I have put over 2k miles on this mod and its working flawlessly still....please let me know what successes/failures you have had :D

Reply #61March 04, 2009, 12:14:14 am

westcoaster

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Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #61 on: March 04, 2009, 12:14:14 am »
I'll let you know how this works in my suzuki samurai....

It's real, it's cheap, and it's simple.
'87 suzuki samurai with a 1.9 AAZ TD transplant

Reply #62March 28, 2009, 05:25:12 am

BGA

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Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #62 on: March 28, 2009, 05:25:12 am »
Wonderful thread. I have nearly finished my mTDI AFN-based build. For monthts my brain has worked on the problem: how to use the nicely built in vw sensor. Biased more to mechanics than electronics I knew that filling two gaps on the sensorwheel with steel would do the job. Not nice work wih an assembled engine! I knew that a divider by two would do the jobb. This and a device to protect it from spikes is all I knew on the electronicall side of it, so now I look forward to Smokey Eddys solution. The vw sensor (G28) has three terminals.1 and 2 is the coil and I guess 3 is grounding the capsule. I connected 1 and 2 to a volvo/yazaki gasser tacho and tested it on my lathe and it showed correct and stabel rpm.


Bo Gunnar
Bo Gunnar

Reply #63March 31, 2009, 09:02:46 am

jimbote

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Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #63 on: March 31, 2009, 09:02:46 am »
Quote from: "BGA"
Wonderful thread. I have nearly finished my mTDI AFN-based build. For monthts my brain has worked on the problem: how to use the nicely built in vw sensor. Biased more to mechanics than electronics I knew that filling two gaps on the sensorwheel with steel would do the job. Not nice work wih an assembled engine! I knew that a divider by two would do the jobb. This and a device to protect it from spikes is all I knew on the electronicall side of it, so now I look forward to Smokey Eddys solution. The vw sensor (G28) has three terminals.1 and 2 is the coil and I guess 3 is grounding the capsule. I connected 1 and 2 to a volvo/yazaki gasser tacho and tested it on my lathe and it showed correct and stabel rpm.


Bo Gunnar


Sweet!!!....cant wait to see the final result... :D

Reply #64March 31, 2009, 09:10:20 am

jimbote

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Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #64 on: March 31, 2009, 09:10:20 am »
still working perfectly!!!!

Reply #65June 01, 2009, 10:06:22 am

regcheeseman

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #65 on: June 01, 2009, 10:06:22 am »
so is mine!
 :P

I tried the 'latch' method as the first way to crack this problem. I believe the ratio using UK spec pulleys was close enough 1:10 - the rest could be dialled in with the cal pot.

I used a 'divide by 10' 4017 chip, circuit worked fine on the lab bench. However the W term was too noisy.

I could have used some signal processing on the front end and further signal conditioning on the output to get a decent 12v square wave out.

As for the auxillery pick up method  - it's not factory - adds engine bay clutter and wasn't the reason for this post. Might be nice to tap the bell housing and pickup on the flywheel. Could also work as TDC detection...

Reply #66June 02, 2009, 10:04:42 am

lord_verminaard

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #66 on: June 02, 2009, 10:04:42 am »
still working perfectly!!!!

Good to know!  I have a question- since you are using two nuts 180 degrees out on the crank, it would be feasible then if you were driving the tach with the intermediate shaft or camshaft pulley that you would use 4 "pickups" instead of two, since it turns at half the speed?

Brendan

81 Scirocco 'S -->Soon to be m-TDI
93 Corrado SLC VR6
'86 Golf N/A Diesel  -->Wife's car
1990 Audi CQ
05 New Beetle PD TDI


"I am a man, I can change... if I have to.... I guess....."

-Red Green

Reply #67June 06, 2009, 04:20:19 pm

jimbote

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #67 on: June 06, 2009, 04:20:19 pm »
still working perfectly!!!!

Good to know!  I have a question- since you are using two nuts 180 degrees out on the crank, it would be feasible then if you were driving the tach with the intermediate shaft or camshaft pulley that you would use 4 "pickups" instead of two, since it turns at half the speed?

Brendan



Yes Brendan you would need four (4) "poles" for any shaft running half speed of the crank for and accurate tach signal....Jimmy

Reply #68August 02, 2009, 10:23:39 am

92EcoDiesel Jetta

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #68 on: August 02, 2009, 10:23:39 am »
Hi jimbote, I just got  CE1 gasoline cluster with a tach which has a fuel gauge on the bottom. I will try to make it fit it my cluster which is a CE2. Looks like I have to custom wire the tach which has a 4 pin connector(only 3 pins used). Did you wire the tach to the voltage stabilizer or direct to 12V ?

Reply #69August 04, 2009, 03:40:26 pm

lusob

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #69 on: August 04, 2009, 03:40:26 pm »
Anybody have idea how to install tacho from golf 2 GTI with MFA to golf 2 diesel?

Reply #70September 04, 2009, 04:45:48 pm

Elwood

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #70 on: September 04, 2009, 04:45:48 pm »
Really? I can only see the last two of circuit boards. I imagine there should be a wiring diagram?

Reply #71September 05, 2009, 10:40:35 am

Elwood

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #71 on: September 05, 2009, 10:40:35 am »
what? why are you being indirect?

The original post talks about wiring, and has gaps in it where I believe images should be. I quote the post, and can see the image links for the missing images, but they do not load. Therefore, there should be more images in the original post, most likely wiring diagrams!

All I'm asking is for someone who has them load to rehost them on another website so I can wire up my speedo! Why are you being so difficult?

Reply #72September 15, 2009, 06:49:34 am

regcheeseman

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #72 on: September 15, 2009, 06:49:34 am »
Didn't realise they were missing, I'm guessing the IT fascists at my previous workplace have cleared the stash of files that I'd hidden on one of their servers  ;D

Send me your email address on PM and I'll send direct. I'm not in a position to rehost for a few days as my homehub has gone tats up. As soon as I do, I'll change the links in the original post

Reply #73September 17, 2009, 01:06:54 am

clyde

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #73 on: September 17, 2009, 01:06:54 am »

I'd like to see schematics of the VDO tach. Particularly if you have one for the GLI single-plug cluster with MFA. Years 1988 through 1992/

Seems a lot cleaner to change a few electronic parts on a circuit board than to make mods and fasten sensors IF the signal from the W terminal will drive a modified gas tach!

Reply #74September 17, 2009, 09:23:32 am

regcheeseman

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Re: Gas Tacho / Revcounter Conversion to Diesel W terminal
« Reply #74 on: September 17, 2009, 09:23:32 am »
Quote
IF the signal from the W terminal will drive a modified gas tach!

No 'IF' about it - no body has bothered doing it for your mk2 set of clocks for the obvious reason that you can buy a mk2 with a diesel tacho (i.e. GL, GTD and GT models) why would you bother converting a set????