Need the Innovate MTX-L Analog Equation for SCT SF3 using LivLink
10-12-2011, 01:03 AM
#1
Need the Innovate MTX-L Analog Equation for SCT SF3 using LivLink
I just installed an Innovate MTX-L wideband O2 sensor. It is not on SCT's list and I have no idea what the equation should be in LiveLink using an SF3.
0 volts is 7.35 AFR
5 volts is 22.34 AFR
I was thinking the LM1 would work, but the MTX-L is a different sender. It could be off.
Thanks!
0 volts is 7.35 AFR
5 volts is 22.34 AFR
I was thinking the LM1 would work, but the MTX-L is a different sender. It could be off.
Thanks!
10-12-2011, 06:51 PM
#2
Found the answer for anyone interested
Download a PDF version of this tutorial
Setting up the Formula in Live Link
Live Link has two programmable Analog input parameters you can choose to data log. These inputs get their signal from the LC-1 or LM-1 through the 9 pin mini-din cable. For this example, we are using Analog input 2 in Live Link and matching it up with Analog output 2 from our LC-1 or LM-1. As of this writing, the most current version of Live Link is 2.36. In this version, each time you start up Live Link, the Analog input formulas must be reprogrammed. They will be set up at the default formula of “V”. In other words, they will only be set to record voltage. We need to enter in a formula to translate that voltage into an Air/fuel ratio. If your LM Programmer software has the default settings, the basic formula will be (V*3.008)+7.35.
This covers an air/fuel ratio range of 7.35 to 22.39. This formula does not take into consideration any ground offset corrections. We’ll be talking more about that later. To change the formula, simply double click on the Analog 2 PID and type in the formula you want to use. You can adjust this formula during a datalogging session. At the bottom of the formula box, there is a “Result = x” line. This line allows you to see what results the formula you are typing will have immediately.
TIP: Be sure to check before each run to make sure the formula is still in Live Link. Each time you start a new data logging session, you have to re-enter the formula.
Building Your Own Formula
It’s important to understand how to build your own formulas for Live Link, because you may want to change the air/fuel range being read. The default range in LM Programmer is 7.35 - 22.39 AFR. That’s a pretty wide range, and is useful for getting your tune roughed in. Once you have the tune dialed in pretty close, you may want to close the gap up some to perhaps 10 - 16 AFR. The smaller the range, the better the resolution is in that range, and therefore the more accurate it will be. However, don’t forget that no AFR outside of that range will be read. It will top or bottom out at those points.
To change the range in LM Programmer, simply click on the Analog Out tab that you’re using, and modify the 0V = X.XX box. Enter the low side of your range here. Do the same on the 5V = X.XX box for the high side of the range. Once we change this range, we then have to build a formula for the new range. First, lets decipher the existing formula to see how it works:
AFR = (V*3.008) + 7.35
AFR = Air/fuel ratio
V = Voltage
3.008 = Range Multiplier
7.35 = Starting point of range
AFR and V are parts of the formula that are not adjustable. What we are going to change is the range multiplier and the starting point of the range. Some simple math will give us a new range, and the starting point will always be just the bottom part of the range. First, let’s look at why it is currently set to 3.008. Right now, we have a range of 7.35 to 22.39 AFR. So 22.39 minus 7.35 equals 15.04. This is our range, or spread. These 15.04 AFR numbers are spread out from 0 to 5 volts. So, we divide 15.04 by 5 and we get 3.008. That’s 3.008 AFR for every 1 volt. Now why is the starting point 7.35? It’s because we use 7.35 as the low half of the AFR range in LM Programmer. Remember, 0v = 7.35 and 5v = 22.39? The distance between 7.35 and 22.39 (which is 15.04) is spread out over the 5 volts.
Setting up the Formula in Live Link
Live Link has two programmable Analog input parameters you can choose to data log. These inputs get their signal from the LC-1 or LM-1 through the 9 pin mini-din cable. For this example, we are using Analog input 2 in Live Link and matching it up with Analog output 2 from our LC-1 or LM-1. As of this writing, the most current version of Live Link is 2.36. In this version, each time you start up Live Link, the Analog input formulas must be reprogrammed. They will be set up at the default formula of “V”. In other words, they will only be set to record voltage. We need to enter in a formula to translate that voltage into an Air/fuel ratio. If your LM Programmer software has the default settings, the basic formula will be (V*3.008)+7.35.
This covers an air/fuel ratio range of 7.35 to 22.39. This formula does not take into consideration any ground offset corrections. We’ll be talking more about that later. To change the formula, simply double click on the Analog 2 PID and type in the formula you want to use. You can adjust this formula during a datalogging session. At the bottom of the formula box, there is a “Result = x” line. This line allows you to see what results the formula you are typing will have immediately.
TIP: Be sure to check before each run to make sure the formula is still in Live Link. Each time you start a new data logging session, you have to re-enter the formula.
Building Your Own Formula
It’s important to understand how to build your own formulas for Live Link, because you may want to change the air/fuel range being read. The default range in LM Programmer is 7.35 - 22.39 AFR. That’s a pretty wide range, and is useful for getting your tune roughed in. Once you have the tune dialed in pretty close, you may want to close the gap up some to perhaps 10 - 16 AFR. The smaller the range, the better the resolution is in that range, and therefore the more accurate it will be. However, don’t forget that no AFR outside of that range will be read. It will top or bottom out at those points.
To change the range in LM Programmer, simply click on the Analog Out tab that you’re using, and modify the 0V = X.XX box. Enter the low side of your range here. Do the same on the 5V = X.XX box for the high side of the range. Once we change this range, we then have to build a formula for the new range. First, lets decipher the existing formula to see how it works:
AFR = (V*3.008) + 7.35
AFR = Air/fuel ratio
V = Voltage
3.008 = Range Multiplier
7.35 = Starting point of range
AFR and V are parts of the formula that are not adjustable. What we are going to change is the range multiplier and the starting point of the range. Some simple math will give us a new range, and the starting point will always be just the bottom part of the range. First, let’s look at why it is currently set to 3.008. Right now, we have a range of 7.35 to 22.39 AFR. So 22.39 minus 7.35 equals 15.04. This is our range, or spread. These 15.04 AFR numbers are spread out from 0 to 5 volts. So, we divide 15.04 by 5 and we get 3.008. That’s 3.008 AFR for every 1 volt. Now why is the starting point 7.35? It’s because we use 7.35 as the low half of the AFR range in LM Programmer. Remember, 0v = 7.35 and 5v = 22.39? The distance between 7.35 and 22.39 (which is 15.04) is spread out over the 5 volts.
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