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Old 01-26-2018, 01:44 PM   #26
Centsableone
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I have basically unlimited hosting space if there are some photos that could be used for this topic. If they're sent to me I can load them and send the link which could be edited into the article and, MAGIC, the all important photos will appear !!
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Old 01-26-2018, 02:00 PM   #27
JW240
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Originally Posted by Centsableone View Post
I have basically unlimited hosting space if there are some photos that could be used for this topic. If there are sent to me I can load them and send the link which could be edited into the article and, MAGIC, the all important photos will appear !!
Great, yes, seen the PM, will get the pics soon! (not on my laptop anymore, need to dig)
Thanks for the offer and will send them ASAP!
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Old 02-01-2018, 05:36 PM   #28
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Old 11-03-2018, 07:23 AM   #29
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Bump, fixed!

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Originally Posted by Centsableone View Post
I have basically unlimited hosting space if there are some photos that could be used for this topic. If they're sent to me I can load them and send the link which could be edited into the article and, MAGIC, the all important photos will appear !!
Ended up finding hosting myself! Thanks for the offer though.

Life has been very busy and stuff.

As far as speedometer work, replaced the odo gear last month. 240 is sporting the aluminium cover now with a homemade tone ring wrapped around a TrueTrack diff. Works great, still. 225/45/17 tires and calibration is good with the aforementioned resistance values.
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Old 10-22-2019, 08:35 AM   #30
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Hi all,

Yet another thread revival...

So we're working on a friends car at the moment, 1978 with a cable driven speedo. The B21A is out and a B230FK is in. Hybrid speedo being made, with a late speedo within the early case (has been done a few times now and someone on here was offering a conversion kit just last week)

My question then - we're tracking down a late axle to transplant in to provide the speed signal for both the speedo and so 2.4lh plays nicely. Would an alternative be to mount a standard diff housing sensor pointing at the 4 bolts of the diff input flange, or the thee bolts of the gearbox output flange, then recalibrate the speedo using an adjustable resistor?

Does anyone know if the range of adjustment would be great enough?

Thanks all,

Cheers
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Old 10-22-2019, 07:46 PM   #31
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I looked at the datasheet for the speedo chip and it should have plenty of adjustment range.

The original setup is 12 pulses per axle (or tire) rev. If you have a 3.73 differential ring/pinion and use the 4 diff flange bolts, you'll get 3.73 * 4 = 14.9 pulses per tire rev, or ~25% higher. Using 3 bolts, 3.73 * 3 = 11.2 pulses/rev, or ~7% lower. Either one should be easily within the adjustment range, and either one is close enough to the 12 pulses/rev to keep LH2.4 happy.

The biggest difficulty may be mounting a sensor, and aligning the bolt heads (or add-on metal flags?), to get a good signal.

[Note: changing the resistor affects the speedo only, the odometer will still be fast or slow depending on the 3 or 4 bolts.]
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Old 10-23-2019, 09:54 AM   #32
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Great! Thanks for looking that up and replying. Annoyingly the engine and gearbox are in the car now, which makes adding something a little more difficult. The gearbox has a conversion bracket like this bolted to the back of it to allow it to bolt to the M47 cross member, it would have been relatively easy to weld a bracket to it whilst it was out of the car as it’s made of steel. Still considering options, might put a complete axle in it.

Can the odometer accuracy be adjusted in a similar fashion?

Cheers

https://www.classicswede.co.uk/M90_g..._17476331.aspx
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Old 10-25-2019, 01:06 AM   #33
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I was the one with the conversion kit! Still did not really have time to design the mph gauge face, but as soon as ****ty weather arrives i definitely start it!

Also i did go driveshaft sensor for my buddy's car. It has a 3,91 diff and has a 3 tooth tone ring, so its reading a bit less than necessary, but worked well for him, and LH is happy without codes.
http://forums.turbobricks.com/showpo...&postcount=216
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Old 10-25-2019, 08:53 AM   #34
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The odometer can't be adjusted in a similar fashion. It relies on an exact count of pulses per mile from the differential sensor.
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Old 10-26-2019, 04:07 AM   #35
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Ah, fair enough.

Well, we’re going with the ‘swap the whole axle’ approach as one came up locallyish and cheapish. Since the axle needs new bushes and brakes, refurbishing the ‘new’ ones and installing it seemed like the best approach this time.

Thanks for the advice,

Cheers
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Old 10-27-2019, 05:34 PM   #36
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Looks like you're sorted … but had I seen the more recent posts last week, I'd have pointed to something like this:

https://www.jaycar.com.au/corrector-...odule/p/AA0376

… which was only available in kit form when I bought one for my car, but which allowed me to convert the Toyota-branded pulses from the 90's Sprinter sensor on the 80's Supra 'box into Volvo branded pulses for the '87 cluster I fitted into the '81 dash (and which isn't actually a perfect fit electrically - despite all looms just plugging in, something is wrong with the ACC setting but ONLY with the '87 cluster fitted - but I don't care as I don't sit there listening to music with the car off).

Something like that might be helpful if there's another thread-dig by someone else.
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Old 02-13-2020, 09:58 AM   #37
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Ok, moving on with this - have contacted petiww to see about one of his conversion plates.

Am I correct in thinking the speedo will read correctly for all speeds, once calibrated?

The pictures from earlier in the thread would be useful... does anyone have a copy?

Cheers
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Old 03-30-2020, 03:24 PM   #38
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I didn't want to wait for a potentiometer to come in so I just tried a few different resistors. I found that about 1.5 ohm of added resistance would decrease the speedo reading about 5%. My original resistor in a '90 240 wagon measured 51.6 ohm. The speedo was reading 5% fast initiallly, even though the odometer was spot on, so it was nice to get it calibrated.
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