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May 29, 2011 14:32:19 GMT
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It doesn't take a genius to notice the number of diesel based threads increasing as more people become captivated by magical empeegees, cheap alternative fuels, low down torque, black smoke or a combination of all of the above.. Quite easy to see why at £6.20ish a gallon...
So it's my turn. I'm putting a big, simple diesel engine into what was once a lovely refined 136 bhp 2.3 litre petrol capable of 30ish mpg if I wore light shoes (I sometimes ask myself why as well) and I'd kind of like to keep the standard clocks if I can. Volvo is pre-ECU gubbins so the tacho is presumably driven off a signal from the -ve side of the coil. I don't especially understand how a derv tacho works (signal from alternator?) so I don't know how possible it is to emulate the signal required to make it work.
I guess the other option would be to find a derv tacho with the right range and sweep and shove its internals into the Volvo clock's casing. Or find a base spec set of clocks, which would be sans tacho and run an aftermarket one.. But the aftermarket ones are all modern and gash or nice looking old ones for commercials that rev to 3500rpm. Going down that route would probably see me rebody a modern one into a cool shell anyway...
Did that come out as a question? I'm looking to make a petrol tacho work in a diesel car, anyone know how?
A bottle of '711200 Industries Home Brew at the gathering to the person with the best answer ;D
Cheers'en
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...proper medallion man chest wig motoring. |
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bdtd
Part of things
Foundered and Frozen.
Posts: 159 
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May 29, 2011 14:41:10 GMT
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Last Edit: May 29, 2011 14:42:37 GMT by bdtd
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May 29, 2011 14:43:57 GMT
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There's info online covering converting a VW tach from petrol to diesel - but it's probably not much use. The diesel tachometers do indeed take their signal from the alternator - by the "W" terminal.
One option would be to build a frequency shifting circuit to convert the W signal into a petrol signal - then you wouldn't have to delve into the dash at all. Another option would be to fit some sort of trigger wheel - with two teeth - to the crankshaft pulley along with a VR or hall sensor and a signal circuit. That might be easier to cobble together with limited test equipment.
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May 29, 2011 14:46:56 GMT
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Brilliant! This opens up many possibilties. Now to see if I can make it without having to spend $70+shipping+VAT+whatever else the government take when it lands.
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...proper medallion man chest wig motoring. |
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May 29, 2011 14:50:38 GMT
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James, you posted as I was replying.. Thanks you. Dodgy homebrew to you both! I'd best get googling and see what else I can come up with now I have a good starting point*
*Then ask James loads of questions at the next playday ;D
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...proper medallion man chest wig motoring. |
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bdtd
Part of things
Foundered and Frozen.
Posts: 159
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May 29, 2011 14:52:13 GMT
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Brilliant! This opens up many possibilties. Now to see if I can make it without having to spend $70+shipping+VAT+whatever else the government take when it lands. I had it back here for £95 all in. But that was earlier this year. |
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`state
Yorkshire and The Humber
Posts: 1,215
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May 30, 2011 13:11:33 GMT
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Ive being looking into this as I'm putting a isuzu derv engine into my mk2 cav.You need one of Doms magic box`s from here www.picbits.co.uk . They`re under the gadgets section and are alot cheaper than 95 bloody quid! |
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Look at all the plastic people who live without a care.Try to sit with me around my table,but never bring a chair.
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May 30, 2011 13:20:57 GMT
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I'll just bring a crate  Many thanks, KWKmanta. £35 is much more tolerable to my skintness/tightness |
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...proper medallion man chest wig motoring. |
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`state
Yorkshire and The Humber
Posts: 1,215
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May 30, 2011 13:24:45 GMT
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Just let Dom know when you order it ts for a derv,as it needs aslight mod. He`s being selling these over on migweb for years and is a sound bloke.
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Look at all the plastic people who live without a care.Try to sit with me around my table,but never bring a chair.
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May 30, 2011 14:27:29 GMT
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I believe these can be used. My saff TD had to have one for it's alarm to alow the remote start to work. Basicly (how the guy explained it to me was) the alternator on my car (being diesel) feeds the cars rev counter, but provides a wave signal. No good for the alarm, it needs a pulse (as per petrol engine). That's what the box does is simple cable tie to the thick wire coming off the alternator to detect pulses, when u get it you have to "set it up" there is a wire (white IIRC) that has to be connected to ONE of 3 others, Orange, Green or Yellow. (it comes with instructions) to suit the car. I'm guessing it's do compensate for difference alternator speeds or sensativity of the system. I'm not too sure, However that seller is the one who fitted my alarm. They might be able to help u out. cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=320623130331&ssPageName=STRK:MEWAX:IT |
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Colonelk
Posted a lot
Posts: 3,740
Club RR Member Number: 83
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May 30, 2011 15:35:51 GMT
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This thread reminds me I really need to dig out my electronics books and find a cheap s/h scope.
Ben..... did volvo ever do a 240 diesel? Find a set of clocks from one and transfer the rev counter? What's the redline on your lump too?
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May 30, 2011 19:03:37 GMT
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the pug xud dervs use a sensor that picks up four slots in the flywheel
bang! Four petrol-friendly pulses per revolution!
Similar setup could be made from four bolts added to a crank pulley, and using a crank sensor
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You're like a crazy backyard genius! |
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bdtd
Part of things
Foundered and Frozen.
Posts: 159
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May 30, 2011 20:12:53 GMT
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Ive being looking into this as I'm putting a isuzu derv engine into my mk2 cav.You need one of Doms magic box`s from here www.picbits.co.uk . They`re under the gadgets section and are alot cheaper than 95 bloody quid! Difference of night and day. Yes it is a lot cheaper but it's not water proof nor programmable nor 'fitter friendly'. But thanks for the put down. |
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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May 30, 2011 20:22:44 GMT
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i was going to raid the scrappy for a astra diesel rev counter for mine and pop the gubbins behind a viva 7 dial dash..
but I'm just going to ebay a new derv tach for 30 quid and bolt it somewhere on the dash for mucho simplicity...
si
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`state
Yorkshire and The Humber
Posts: 1,215
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May 30, 2011 20:56:16 GMT
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bdtd,can you point out why the one you bought is any better than doms? And why you think its not fitter friendly? As I cant see no difference,they both do the same job.
As for being waterproof,where do you think I'm going to mount it? It`ll be in the car behind the dash.Last time I looked that was a dry area.
Doms is also `tunable` to what you need.What did you programme yours to do? Make the tea?
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Last Edit: May 30, 2011 21:03:37 GMT by `state
Look at all the plastic people who live without a care.Try to sit with me around my table,but never bring a chair.
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May 30, 2011 21:12:47 GMT
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I've got one of those although I never got round to fitting, think I paid £50 for it from a lad that bought a few of them to over to balance out the shipping costs. |
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bdtd
Part of things
Foundered and Frozen.
Posts: 159
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May 30, 2011 21:15:33 GMT
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bdtd,can you point out why the one you bought is any better than doms? And why you think its not fitter friendly? As I cant see no difference,they both do the same job. As for being waterproof,where do you think I'm going to mount it? It`ll be in the car behind the dash.Last time I looked that was a dry area. Doms is also `tunable` to what you need.What did you programme yours to do? Make the tea? Mine is under the bonnet, where it is easy accessible for fitting or removing. It has 2 buttons for adjusting the the tacho idle to factory spec, simple up and down moves the needle on the guage. It also has push terminals for all wiring making installation/removal a doddle. Comes with LEDs too for correc t programming. I am not saying that the one I got is any better than the other, it's different for differing applications, but it is my hard earned that I spent on it and I resent the implication that I over spent. AFAIK mine is the only Trooper conversion so far to have a working tach. |
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`state
Yorkshire and The Humber
Posts: 1,215
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May 30, 2011 21:29:43 GMT
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Wether you resent it or not one is cheaper than the other.You could have got one here in good old blighty for less money that does the same job just as well.
Anyone with a trooper could get doms converter and have the tacho working in 10 mins.
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Look at all the plastic people who live without a care.Try to sit with me around my table,but never bring a chair.
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bdtd
Part of things
Foundered and Frozen.
Posts: 159
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May 30, 2011 21:37:22 GMT
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Wether you resent it or not one is cheaper than the other.You could have got one here in good old blighty for less money that does the same job just as well. Anyone with a trooper could get doms converter and have the tacho working in 10 mins. And yet none ever did. Strange that. |
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May 30, 2011 22:35:31 GMT
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i had a diesel rev counter gauge in my old td, mounted it tnext to my boost gauge, got it for about £25 off of ebay plugged into w terminal on alternator, little screw on back to change settings.
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