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#1 |
Board Member
Join Date: Nov 2003
Location: Denver CO
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![]() I need a speed signal to feed pin 34 of an LH2.4 system. I'm planning on installing an '90 B230F engine from a 240 (I have a whole parts car-so I want to use the LH2.4 fuel/ignition system) into an '61 P210. So, no speed sensor in the rear axle like the 2.4/2.2 cars. I understand that the LH2.4 system requires a 0-12 VDC squarewave (50%/50% up/down) signal to pin 34 to run correctly.
I posted something on the "performance & suspension" section, and seems that the driveshaft flange bolts could be used as a trigger wheel, and an ABS sensor mounted on the transmission could produce the correct signal. http://turbobricks.com/forums/showthread.php?t=131814 If anyone has a suggestion on how to build a circuit (either with a ABS sensor or any other sensor) to give the correct signal to pin 34, I would appreciate it. Paul |
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#2 |
Guest
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![]() I will try to post something later tonight. A few NAND, capacitors, diodes and resistors should be able to do it. And you could put it directly in the ECU if you want.
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#3 |
Board Member
Join Date: Nov 2003
Location: Denver CO
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![]() I'm not sure what kind of sensor the ABS sensor is, I assume it's a 2-wire hall effect or a VR? I'm glad somebody understands how to make it work.
I think an external circuit would be best, and have the output go into pin 34. No messing with the ECU, just a stand alone unit in case something goes wrong. Thanks- Paul Last edited by malloy1; 04-11-2008 at 09:32 AM.. |
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#4 |
Guest
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![]() I tried to make a simulator for you guys, but it didn't work for some reason. The output of the simulator was what I expected, but it didn't do anything for the ECU at all.
I wonder if the ECU knows that you are driving and estimates when to expect a signal? I have to look into this. |
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#5 | |
Board Member
Join Date: Oct 2004
Location: Antioch, CA
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![]() Quote:
have you tried to tap into the crank position sensor and use that signal??
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#6 | |
Board Member
Join Date: Nov 2003
Location: Denver CO
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Paul |
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#7 | |
Board Member
Join Date: Nov 2003
Location: Denver CO
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![]() Quote:
Any suggestion on a Hall sensor that could hold up being mounted under the car? What about the impulse sensor in the rear axle? That has to give out the right signal, but what about being durable under the car? I suggested tapping the flywheel sensor, but when the car is stopped, the sensor would still give a pulse signal. Any idea on how the signal could be tapped and converted? Paul |
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#8 |
Board Member
Join Date: Apr 2006
Location: Lawrence, KS
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![]() Last edited by smosit; 04-12-2008 at 11:38 PM.. |
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#9 |
Board Member
Join Date: Apr 2006
Location: Lawrence, KS
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#10 |
Board Member
Join Date: Apr 2006
Location: Lawrence, KS
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#11 | |
Guest
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![]() Quote:
If that function was abscent in the ECU, it would not have made a very big difference and most people would probably not miss it. But it does make a difference in driveability. |
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#12 |
Traitor
Join Date: Aug 2004
Location: Salem MA
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![]() any chance of fudging an abs-style tone ring into one of the front disk hubs to make the signal?
that way the signal is actually valid for LH instead of trying to trick it.
__________________
'92 944 Turbo:13.400@99.68. Sold. '90 744 16 Valve. 16.317@85.55. Sold. '92 244. Sold. http://pbase.com/740weapon |
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#13 | |
Board Member
Join Date: Apr 2007
Location: Near Cambridge England
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![]() Quote:
![]() As folk are looking at this can anyone tell me the number of triggering 'teeth' there are on a 940 diff? It would not take me long to do it myself but it is one more of those five minute jobs I never get five minutes for. Rob
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1981 / 245 DL / dung brown / B21A / M47 / 3.3:1 axle from auto (5th not used much) / Scrapped. 1982ish /240GLT Estate/silver/Scrapped 1994 / 940s Turbo Auto Estate / B230FT /metalic green / Scrapped 1993 / 940s Estate / B230FB / Blue / Scrapped 1992 / 940s Estate / B200? / White / Gone.probably scrapped. 1967 Amazon Estate (Sold) Current Cars... 1998 940 Celebration /B230FK /M90L2/Galaxies (Blue) 1998 940 Celebration Standard (Red) 1998 940 Celebration Standard (Purple) |
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#14 | |
Traitor
Join Date: Aug 2004
Location: Salem MA
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i know, my 940 throws the axle sensor code occassionally. and i can tell when its going to before it does. |
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#15 |
Board Member
Join Date: Nov 2003
Location: Denver CO
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![]() Ryan-
Those links look very promising! One of them had a trigger wheel mounted to the driveshaft, which is what I was thinking (just on the front section): ![]() I like the ones that mount on the speedometer cables, but I would think it would be better to mount it next to the speedometer not on the transmission. Still need to figure out if the output to any of these can produce the right signal or if it needs a circuit to feed the ECU. Also, need to figure how many pulses the ECU needs per mile. Paul |
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#16 | |
Board Member
Join Date: Nov 2003
Location: Denver CO
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Paul |
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#17 | |
Board Member
Join Date: Nov 2003
Location: Denver CO
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Paul |
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#18 | |
Guest
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But I don't think you need to make a circuit if you just mount a sensor and a wheel somewhere in the driveline. |
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#19 |
Board Member
Join Date: Nov 2003
Location: Denver CO
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![]() Thanks again!
I thought the speedometer sent the signal to Pin 34 of the ECU, so I can just bypass the speedometer, and send the signal directly to pin 34. Do I just apply 12V to one wire of the speed sensor, and the other would be the signal wire to Pin34? Paul Last edited by malloy1; 04-15-2008 at 07:16 PM.. |
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#20 | |
Board Member
Join Date: Aug 2006
Location: E(Seattle!Vancouver! San Francisco!LA!) Helsinski
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Or just "swap" rear-axle from 240 ? |
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#21 |
Board Member
Join Date: Nov 2002
Location: Bergen, Norway
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![]() The speedometer contains a circut which converts the sine-wave from the diff sensor into a square wave for the ecu's. The output is an open transistor emittor, and pulls the ecu-input low. It can not be replaced with just a cable from an ABS sensor. When installing a 960 driveline in a 242, I removed the circut board form the speedometer (not to be confused with the instrument cluster), and used this to get signals for the ecu's and 240 speedometer
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Stein Ove Vikeboe Norway '80 244 DL USA (Currently under reconstruction) '86 740 Turbo Intercooler (Rusting in peace) '97 940 LPT Wagon (Daily Ride) 240 Turbo by R-sport (Norwegian page) volvo@vikeboe.com |
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#22 | |
Board Member
Join Date: Nov 2003
Location: Denver CO
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Thanks- Paul |
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#23 | |
Board Member
Join Date: Nov 2002
Location: Bergen, Norway
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I ripped the electronic speedometer circut board from a 960 speedometer. I removed the connections to the electronic motors running the needle and odometer. I was then left with the bare circut board which I fitted in a case from an old mercedes ICU, which I had stripped of its old circut board. Then it is only about hooking up +12V, ground, sensor + and -, and the output to the ecu (I was running both the ecu, and speedometer of the same output, and had to make a separate circutboard with a couple of transistors and resistors to split the signal, but this shouldn't be a problem to you.) The ECU expects a 12 pulse/rev signal, and this is converted from the 48 pulse signal from the diff by the speedometer circut board (the 48 pulses on later volvos are to give the TCU and ABS system better resolution, and is provided by a separate speedometer output. Older speedometers run of a 12 pulse tone ring. You need to make shure that you get the correct speedometer circut board for the tone wheel you plan on using. |
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#24 |
Broad Member
![]() Join Date: Nov 2002
Location: Aurora, Ontario
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![]() Try this Allegro part
http://www.allegromicro.com/en/Produ..._Numbers/0665/ It is a hall sensor with built in magnet. No other circuitry required. Ask for a sample.
__________________
Got knock? Got Megasquirt? Check out Knocksense knock indicator and KnocksenseMS indicating Megasquirt interface.http://www.viatrack.ca/ |
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#25 | |
Board Member
Join Date: Nov 2003
Location: Denver CO
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![]() Quote:
![]() Digi-key is a supplier of it. $5 each. The picture looks like it's not really durable enough to be mounted out in the elements. I did find this Hall sensor made for the automotive market. I really didn't want to post anything until I tried it out. I have an order in, but it's on back order for the next two weeks. ![]() http://www.bbautomacao.com/proddetai...rod=CYGTS101DC Spec sheet is here: http://www.bbautomacao.com/home_hall...YGTS101DC.html It needs a pull-up resistor circuit, but thats easy enough. If this doesn't work, I'm going to try and pull the circuit board from the speedometer. Paul Last edited by malloy1; 04-30-2008 at 12:26 PM.. |
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