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Old 05-02-2014, 11:16 AM   #1
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Default How stable is your MTX-L?

I've been running with an MTX-L for about 2 years now, and it's always been a little "jumpy". It rapidly fluctuates about .4 tenths at idle, and about 2 tenths of a point while running. For example, in boost if my target AFR is 13.5, It will rapidly fluctuate between 13.3 and 13.7. I always assumed this was normal based on seeing some Youtube videos and a few other Miatas.

Last night, I was driving my buddies FD doing a first run after a rebuild, and his MTX-L was dead nuts on target. No fluctuation whatsoever. At idle, it stuck exactly where it was supposed to, with an rare .1 spike. When driving, it was smooth and on target. I question if it had to do with the tune, as we had just loaded a base map and were tuning cells as we drove.

Is this just a difference in the cars or is there something in LM programmer that can change how quickly it operates? I would love for my gauge to be as silky smooth as his was.
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Old 05-02-2014, 11:19 AM   #2
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What is the difference between where your friends sensor is mounted in the exhaust stream and yours?
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Old 05-02-2014, 11:23 AM   #3
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His FD stock ecu or MS like you?

You can mess with the settings to make MS react faster or slower, but overall that sounds pretty normal.
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Old 05-02-2014, 11:31 AM   #4
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He's running an adaptronic. My Sensor is about halfway between the cat and the turbo outlet flange, not sure where his is located.
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Old 05-02-2014, 11:36 AM   #5
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Sounds like you just need to tune your car better
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Old 05-02-2014, 11:38 AM   #6
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Lulz, that's what I figured. It's just that his is the only one I've ever seen run that smoothly.
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Old 05-02-2014, 11:55 AM   #7
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is yours setup to output 10-20:1 or 7.35-22.4:1?
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Old 05-02-2014, 11:58 AM   #8
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7.35-22.4:1.
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Old 05-02-2014, 11:38 PM   #9
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I've never seen an Innovate wideband display steady either, unless at WOT full boost.

Cruising and idling on all my cars is a constant back and forth of .2-.6.
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Old 05-03-2014, 04:48 AM   #10
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Quote:
Originally Posted by concealer404 View Post
I've never seen an Innovate wideband display steady either, unless at WOT full boost.

Cruising and idling on all my cars is a constant back and forth of .2-.6.
Because poverty DB gauges.

LC-1 + XD16:

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Old 05-03-2014, 11:00 AM   #11
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Never used a DB gauge, and wouldn't gauge display be dependent on controller anyways?
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Old 05-03-2014, 02:59 PM   #12
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I know that with the LC-1 you can program the output update rate. At slower settings the readings are averaged and the gauge is steadier. Maybe this is available on the MTX-L too?
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Old 05-03-2014, 06:05 PM   #13
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And what is the secret to have a steady AFR with the MTX-L? Mine is not really stable.. But okay. Even during cruise it fluctuate 0.3 up and down
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Old 05-03-2014, 11:16 PM   #14
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The secret is having a proper tune.

Also anyone trying to get the gauge to "slow down" and start "averaging out" the display or output is borderline retarded. That's the only thing that is GOOD about the MTX-L pretty much, its fast and precise reading.
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Old 05-04-2014, 05:31 AM   #15
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Proper injectors and proper tune.
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Old 05-04-2014, 10:29 PM   #16
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I'm sure proper tune has a lot to do with it, but I have been running mine for a little over a year and it sounds like yours, all over the place it seems.

I am running the stock ECU with a fuel card.

Just this week I installed a new sensor, but this time installed a heat sink. Don't know if the sensor made the difference or the heat sink. I tend to think it was the heat sink.

It is much more stable now.
D
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