TPI Programming Service For Your Stock Or Custom Street Rod

How To Datalog With Datamaster

Update July 12th 2016: TTS Powersystems has chosen to no longer support Datamaster so those of us who paid for licenses got taken. If you must use it I do still have the copies and can send them to you if you want. However, without support it will eventually become obsolete. I would encourage you all to see my TunerPro RT page. It actually records BLM averages for every cell so it's really better.


This website is here to encourage you to tune on your own. This page may also be used to learn how Datamaster functions, and to create a datalog to e-mail me for my help too. As you will see, using Datamaster for datalogging is a powerful tool. You may use it for the first 20 files for free, and will most likely want to purchase it afterwards. First, you start by downloading the appropriate version for your application from the links page, or custom tuning page. The example used here is Speed Density TPI DM35x8D.EXE.

Hopefully you've bought your cable from moates.net which has been linked on this site (less trouble). In the comfort of your home, plug the cable into your PC laptop to a USB 2.0 port. At this point a screen should pop up saying Windows has found new hardware and if the correct driver was found you may proceed below. 

If you are unable to assign a COM port in Datamaster, or you can't communicate with the ECM you may need to update your USB driver (make sure you are plugged into a USB 2.0 port). It can be found here http://www.ftdichip.com/Drivers/VCP.htm .

Next you will open the program, and choose File, Record ALDL Data, and the screen should look like this when the Serial Data Acquisition window opens: (note that COM 1 has been assigned)

In the Serial Data Acquisition window choose file open, and this screen will appear, so you can assign a file name (without a file name no data will be saved). Please note I used a date 4242012. You may name it whatever you wish. Now click Open:

Now the Start button has changed from gray to black, so you can finally plug your cable into the ALDL port, start the vehicle, and press Start to begin recording data.

You are now recording data. The hard part here is to get enough time driving as possible, and all types of conditions possible. I like street driving, and a couple WOT runs, so I can see what the O2 sensor is reading. At the end allow it to idle in and out of gear for a minute or two. Try and record at least 15 to 20 minutes of closed loop operation. At the end, you will close out of the file, and click Yes when it asks if you want to save it. 

You may now open Datamaster again, and choose File, Playback Datamaster File. Once it opens, choose View, and the Histogram, and then click Start.

Once you click Start the file will begin replaying, and the Histogram will populate the cells giving fuel averages over the entire datalog (note that if you do not hit a cell it cannot be tuned, so you should attempt driving outside your normal conditions). Notice how all devices are shown on one screen. 

Next, let's tune a cell at 2400 RPM, and 40 KPA vacuum. Please note the Histogram below shows 76 hits on this cell, and a BLM average of 123.5. Knowing that 128 is best, we take 123.5 / 128 = 0.9648347. We now have a multiplier for this cell. See below:

Using your favorite .bin software modifier bring up your VE tables (Volumetric Efficiency Table). I like CATS, or TunerCat. I now use my multiplier X the 72.3 shown in my VE table shown at 2400 RPM, and 40 KPA vacuum, and I came up with a new VE of 69.8. However, experience has taught me to go one number higher, so I'll change this cell to 70.8, so that it remains on the rich side. There are more than 260 different cells in TPI that can be modified, so it will take some time, but the benefits of a smooth fuel map are well worth it. Once BLM's are between 124, and 128 I call it good. They can change daily slightly with the weather, but once this close smooth operation will occur without any hestiation.

There's other software out there that is free, but none are as user friendly as Datamaster. I've tried using others that will remain unnamed, but get frustrated, so Tunercat.com is well worth the extra money for me. Please feel free to e-mail me with any corrections or additions.

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