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Author Topic: Mychron 5 2T - help!  (Read 317 times)
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RAM.

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« on: April 11, 2017, 11:16:00 AM »
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Hi all

I used my new Mychron 5 it for the first time on my twin on the weekend and it wasn't displaying the EGTs correctly.

The sensors showed incorrect readings that never really went above 60c.  I have used a Mychron 4 2T with the same application on a twin cylinder engine, which correctly showed readings up to 600c.

I swapped EGT sensors and the Y cable around to rule out if they were faulty, but it didn't make a difference.  I even upgraded the firmware but nothing changed.

At one point during the day, the Mychron changed the on screen labeling on one of the temperatures to CHT, despite the fact I wasn't running a CHT sensor.

Is there anything I can do?  Has something been incorrectly set up? Or could the unit be faulty?

Thanks
Matt Ramsden.
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Matt Ramsden
South Australia
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Ashley Zahl
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« Reply #1 on: April 11, 2017, 12:25:41 PM »
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1 thing you must make sure of is that the tacho wire is nowhere near the EGT cables as that will interfere with them
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Ashley Zahl
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Dougie
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« Reply #2 on: April 11, 2017, 01:03:57 PM »
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Had issues the first time i ran my Mychron 5 2T as well. You might be already, but it turns out you MUST run a resistor plug. As soon as i put one in all my readings were normal.
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Doug
Queensland
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RAM.

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« Reply #3 on: April 11, 2017, 01:19:08 PM »
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Thanks guys!  Will try these.  By resistor plug, you mean the spark plugs?
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Matt Ramsden
South Australia
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Dougie
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« Reply #4 on: April 11, 2017, 03:13:05 PM »
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Yeah a resistor spark plug.
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Doug
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« Reply #5 on: April 16, 2017, 10:13:23 AM »
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Tried all of these suggestions and still no difference!  Any other ideas???
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Matt Ramsden
South Australia
250 International #45
Mike Wayne
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« Reply #6 on: April 16, 2017, 02:01:51 PM »
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Matt,

Were the readings moving around at all? Have you downloaded the data to see if the trends make sense? Sure it's just not a scaling issue? I.E. If temperatures start at 0.25c then move up to 15c when you start the engine, then range up to 60c when you are at full throttle, then you have a scaling setup problem with it being one decimal place out.
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Mike Wayne
South Australia
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RAM.

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« Reply #7 on: April 17, 2017, 10:41:48 AM »
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Hi Mike

Yes they were moving around but they didn't show 0.X they were definently whole numbers on the dash, but under power they never went above 90c. However, when I downloaded the data one of the EGTs was accurate and showed what it should be (inconsistent with the dash) but the other was low and jumping all over the place in between 20 to 60c.

How do I check if it is a scaling issue? Just to be sure.

Matt.

Matt,

Were the readings moving around at all? Have you downloaded the data to see if the trends make sense? Sure it's just not a scaling issue? I.E. If temperatures start at 0.25c then move up to 15c when you start the engine, then range up to 60c when you are at full throttle, then you have a scaling setup problem with it being one decimal place out.
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Matt Ramsden
South Australia
250 International #45
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