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Old 10-16-2020, 12:50 AM   #1
90volvo
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Default Megasquirt ignition options

I have 90 Volvo 240 just installed rebuilt engine. Iím installing megasquirt2 and building my own harness. Last time I had it running on the megasquirt I was always loosing signal with the 2.4 cps. I tried 3 different cps senors, resistor was installed and had everything grounded correctly. But still battled loosing signal. Iíd like to try a different option, Iíve read about a fount mount cps wheel but not available in the states. How does Msd box work out and use dist. To trigger it? Iíd like to keep it simple and reliable. Thanks for any advice.
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Old 10-16-2020, 01:11 AM   #2
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240 with the block mount distributor? Try the Yoshifab CAS adapter

https://yoshifab.com/store/billet-re...s-adapter.html

You used to be able to find the Cam Angle Sensor from a 1994 or so Sonata brand new from Rock Auto for around $50. That ship appears to have sailed and they are now all over $100. You may be able to get one from a salvage vehicle as they were used on a number of different cars.

Not an inexpensive solution; but, a rock solid reliable solution. I have been running the B20 version of the adapter with a Sonata sensor with MS2 Extra since 2016 without issue. Of course, if your wiring is badly done or you have bad grounding no sensor change is going to fix that problem.
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Old 10-16-2020, 03:36 AM   #3
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Hey thanks for advice. When I had it going last time around, I ran Kenny’s plug and play. So some of it could of been factory wiring probs. When I pulled engine I decided to pull original harness out. I’m going to build ms harness and try and do a neat job.

When I started digging about the 60/2 set up it seemed like I read a lot of post of signal problems. I thought about the y.DSM. But don’t know much about it. Hate to ask but do you have a link or know off the top of your head how you wired it up? Thanks for your advice. Appreciated

Last edited by 90volvo; 10-16-2020 at 04:04 AM.. Reason: Updating fix grammar
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Old 10-16-2020, 07:28 AM   #4
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Mueller makes an adaptor to run the diyautotune hall sensor in place of the Volvo vr sensor. It was a sanity upgrade for me. Zero sync errors and I haven’t looked back. Cheap too.
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Old 10-16-2020, 09:32 AM   #5
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^^^ if this is still available, it would be a great solution. The DIY hall sensor is here: link

Hall sensors are much easier to work with than VR sensors because they put out a 0-to-5 volt signal regardless of RPM. The output voltage of a VR sensor varies with rpm (really roughtly, from ~1 volt at lowest rpm to ~100+ volts at max rpm). With MicroSquirt and a VR sensor, you need to find a resistor to reduce the max voltage enough but not be too big to squash the signal when cranking.
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Old 10-16-2020, 11:07 AM   #6
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hall sensor in place of cps would be easy and simple. I will see if I can find Mueller. Thanks
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Old 10-16-2020, 12:10 PM   #7
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I have a new DIY Autotune Hall Sensor that we did not use on our original Jeep build.
Send me $20 and its yours, PM for deets.
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Old 10-16-2020, 03:53 PM   #8
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Quote:
Originally Posted by 90volvo View Post
Hey thanks for advice. When I had it going last time around, I ran Kennyís plug and play. So some of it could of been factory wiring probs. When I pulled engine I decided to pull original harness out. Iím going to build ms harness and try and do a neat job.

When I started digging about the 60/2 set up it seemed like I read a lot of post of signal problems. I thought about the y.DSM. But donít know much about it. Hate to ask but do you have a link or know off the top of your head how you wired it up? Thanks for your advice. Appreciated
There used to be a rather lengthy thread on using the CAS with the Yoshifab adapter in the Aftermarket Engine Management Forum. It would be at minimum of 5 years ago. I was not able to find it. If you find that thread, be aware that in that thread the idea of using a trigger offset of 10 deg for the cam tooth was floated. If you read the MSExtra manuals, they recommend against this and give a preferred range for the trigger offset. I think I am using 60 deg. The 10 deg offset kind of became 'internet wisdom' for a while so watch out for historical threads that include it.

The basic wiring is covered in the MSExtra manuals. You can find a number of threads discussing set up issues with the CAS which will give you some good back ground info. This is a starting place.

https://forums.turbobricks.com/showthread.php?t=311584

As an observation, if you have the code set up for a 60-2 wheel switching to a Hall sensor from a Vr sensor would be the low cost path to fixing 'sensor' issues.
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Old 10-16-2020, 06:31 PM   #9
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so how do and where to get adapter to run the hall sensor? Or can it be made with drill press and grinder. LOL
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Old 10-16-2020, 07:01 PM   #10
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A little searching found this: http://forums.turbobricks.com/showpo...2&postcount=72


And this: http://forums.turbobricks.com/showthread.php?t=268026


Mueller: last visit 07-14-2020
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Old 10-16-2020, 07:28 PM   #11
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Thanks that great. I tried searching but didnt find. I appreciate your help millions.
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Old 10-19-2020, 08:00 PM   #12
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I made a cad model of it in case the plans disappear.
https://grabcad.com/library/b230-bra...nsor-adapter-1
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Last edited by Hodginsa; 10-19-2020 at 08:05 PM..
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Old 10-28-2020, 06:33 AM   #13
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Did you use shielded microphone cable for the sensor?

If it's a hall sensor, Forget this comment.
If it's a Magnetic pickup, Unshielded wires are going to get you strange issues.

Ps, shield needs to be connected to sensor ground on the ECU SIDE ONLY
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Old 11-07-2020, 12:17 AM   #14
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Im about done completely rewiring the MS. But yes I was using shieled wiring. Thanks for the reminder.

Last edited by 90volvo; 11-08-2020 at 03:28 AM.. Reason: update
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