MTX-L and MS3 - some interesting readings.

[mike_tosen]

Well after researching the innovate mtx-l and the ms3, found that there were allots of post regarding the differences between the two.

So I decided to do a few tests on the bench.
I setup the mtx-l - in programming mode - and set the voltage output on error to different values(with the probe disconnected) - on the ms3 I put up a ego voltage gauge and the normal afr gauge.
After each program - the mtx outputted the said voltage - and was close measured with a multi meter.

Here is a table with the results with the programmed mtx voltage and then the voltage reported my ms3:

Code: Select all

MTX(v)		MS3(v)
0		0.02
0.1		0.12
0.5		0.53
1		1.05
2		2.08
2.5		2.6
3		3.11
4		4.15
4.5		4.66
4.7		4.86
4.8		4.96
4.82		4.99
4.83		5
anything  over 4.83 - just pegs the ms3 at 5v.	 

Took a multi meter reading at 4.82(mtx) voltage - multi meter reported 4.9 volt

I then proceeded to program the mtx to output 0-4.83 volt - as this will give the full sweep on the ms3
I setup the ms3 with a custom linear wide-band and entered the values as per mtx manual - 0v=7.35 and 5v=22.39

But there was some strange responses round the 0 volt range almost looks non linear.
Fiddled some more and found if I raise the mtx 0 point to 0.03 volt - the ms3 reads it as 0.1 volt - so programmed the mtx with a 0.03-4.83 output and then the ms3 with a 0.1-5v range

Great - everything matched through the sweep, EXCEPT 5v - with the mtx outputting 4.83v - the ms3 reads 5v - but displays only 22.3 and not 22.4, even if I raise the mtx voltage to 5v - then the ms3 gets over 5v and the reading is still only 22.3, I even tried to set the 22.4 point to 4.95volt on ms3 - nothing.
If I change the 5v point to 22.5 - then 5v displays 22.4, but now the rest of the curve is off again

Anybody else notice anything like this ?

Seems like the max point in ms3 on the custom wide-band setup - will only display the max value, if the voltage exceeds it ? not exactly matches it ?

I do not have a jimstimm, so can somebody with one please verify this, just setup a custom wide-band - say with 0.1v = 7.4 and 5v = 22.4, then feed it 5v and see what the MS3 reports ?

Thanks
Mike

[Laminar]

I also have an MTX-L and need to reprogram the range so I'm hoping to figure out the serial connection sometime this week, maybe I'll play around with it a bit to see what I see.

[mike_tosen]

Did some more work on this.

Seems that at lower voltages - there is some non linear thing happening ???

So what I did was to setup the MTX like this.
0.03 volt = 7.4
4.83 volt = 22.4

On the MS3 the linear wideband setting I ended up with is :
0.91 volt = 10
5 volt = 22.5

setup like this - at the rich side of the scale - below 10 - it seems to be out 0.1 afr, but not planning to spend anytime there

From 10 all the way to 22.4 the mtx and the ms3 matched each other exactly

Not sure all the mtx and ms3 will need the same settings - you will have to check, but welcome to try these settings and see if you are closer.

[flak monkey]

I had exactly the same issue with my MTX-L and MS2 - I ended up doing exactly what you did and fiddle with the linear WB settings until the gauge and TS matched.

I sold the MTX-L a while back and was planning to use an AEM or 14point7 controller on my next installation

[SwedCharger-67]

I had the same with my MTX-L and MS3...I had even 3 different values, the MTX-L gauge, the Logworks software, and the MS3. I reprogrammed the MTX-L and they all were in sync, unfortunately I don't remember the exact details anymore. I wasn't a problem in my opinion.

[Laminar]

Here's what I got on the first try:

Code: Select all

MTX(v)		MS3(v)
0                      0.01
0.1                   0.11
0.5                   0.52
1                      1.02
2                      2.04
2.5                   2.55
3                      3.05
4                      4.07
4.5                   4.57
4.7                   4.78
4.8                   4.88
4.82                 4.90
4.90                 4.98
4.92                 5.00

I ended up with 0V=10, 5V=20.1 in TunerStudio to get the physical gauge to match TS's gauge.

[fmland2]

I am running a MTX-L as well using the LSU 4.2 sensor. I also noticed a discrepancy in what the MTX-L was reading versus TS. My current sensor is dead from running too rich and I will have a replacement Monday. I will check and see how it reads and will post my findings.

[LDR]

Hi all, where do I find the settings for this in TS. I would like the MTX-L and TS to match also.

[Laminar]

Tools > Calibrate AFR Table

You may need to "Un/Lock Calibrations" first.

[LDR]

Thanks, its way closer now than it was.