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Racepak Help & Tips - Click on one of these titles:
1. Setting engine RPM to be the record trigger 2. Sample rates
3. Power Gild Channels 4. Pressure Sensor Plug Installation
5. Correcting duplicate O2 cyl1 6. Mounting VNet Modules
7. Quick review of Racepak Datalink Graph 8. Changing number of magnets in shaft collar
9. V300 / V300SD Frequently asked questions 10. Strange Ultra case sensor installation
11. Stick / Clutch RPM sensor info 12. Pressure Sensor Facts
13. Multiple Sportsman setups in one laptop 14. Backing up your Racepak data logs
15. MSD 7761 pulse count passed to RP 16. How to get an average of one data channel
17. How to program the Racepak IQ3 18. Download Jetsize spreadsheet
19. How to measure for the DS collar 20. Using V300SD clutch input as TBevent
21. Changing G-meter settings for reverse mount 21. How to E-mail a Racepak data log
22. Adding new V-net sensor (READ V-NET procedure) 23. Shock Sensor Setup
24. Interesting Data Logs 25. You got a new laptop
26. Machining a collar to a new size 27. How to get Sportsman/IQ3D system id or Product Ver
28. How to E-mail a Racepak configuration file 29. How to enter channel update code
30. How to replace Racepak configuration file 31. How to install your license info
32. How to do a telemetry - live recording 33. How to connect a grid
34. How to diagnose no DS RPM 35. How to delete runs from the SD card
36. How to overlay runs / data logs 37. How to change pressure sensor scaling
38. How to modify DS pulses on one log 39. Understanding Vacuum
40. How to use a 12 volt event  
There's a link to the left to get to the download page for software/firmware/manual.

Changing the record trigger to Engine RPM

1. Hook up your laptop with the serial/stereo-type plug to your Sportsman with the power on the Sportsman
2. Open Data Link Software
4. Select Sportsman Sportsman (or a different name if your use something different)
5. Right Click on the top left channel button which is Sportsman
6. In the System Options section in the bottom left sub-window highlight Record Enable Channel.
7. On the right a drop down will appear with your current trigger item - change it to Engine RPM (You go upwards)
8. One line down within System Options, highlight Start recording When Channel Exceeds Value.
9. A text box will appear on the right where you enter 5000 or whatever you choose.
10. click on Send Configuration (which sends this to the Sportsman)
11. Click on FILE/SAVE




This occurs anytime two identical V-net ID's are installed on a system. Weather it is two AF-1's or two Carb pressures it essentially the same response

Screen shot showing duplicate error

Click on OK

Screen shot showing the O2 as a serial number

Right Click on that serial number

This screen will appear and you change the V-net to Cyl2

1. Left click on drop down
2. Left click on + of Fuel System category (screen shot shows -)
3. Left click on AF2 or whatever cylinder you want

You have changed the vnet Id and need to send it to the module and to your laptop

1. Left Click on Send
2. Left click on OK

screen showing that the o2  received the new info
Now you see the  AF2 on the channel button.

Last step is to save the config to you laptop
1. Left Click on Floppy disk Image


Quick Review of a RP graph

The Racepak software is called DataLink (actually DataLinkII) . It provides download, view, overlay, print, export and search capabilities.

   V-net Mounts

V-net mount 

Click here for more info.




 Changing Driveshaft Pulses Per Revolution

1. Connect PC to V300SD / Sportsman unit with serial cable (9 pin on one end and stereo end on the other and use your USB converter if necessary)
2. Turn power on the the recorder
3. Open DataLink software on your laptop
4. Go to File, Open Car Configuration
5. A box pops up for you to select your recorder & Config file
6. The second button on the screen is the DS RPM - Right Click on it.
7. Near the bottom of the lower left section is Pulses Per Revolution - left click on it.
8. This will open up a box on the right containing the number of magnets it is currently set for. change it to the desired number.
9. Left click Send Configuration near the bottom right.
10. A message log window will appear and start scrolling numbers very fast.
11. When a message appears Device Programmed Successfully, left click OK
12. Select File up at the top left of the Datalink screen
13. Left click on Save to save the change to your laptop.
14. Cycle power off/on the recorder to lock the changes in.

Also, you can change change existing runs recorded with a 8 magnet collar but the setup still on 2 by:

  1. Load the run into data link.
  2. Right click on DS RPM
  3. Find the box towards the right that says Raw data value B 1 will become 1
  4. Put .250 in the second box so that it reads Raw data value B 1 will become .250
  5. Click on OK on the bottom right.
  6. Click on the Save icon (looks like a floppy disk)

Read V-net procedure

  • Hook USB converter & serial cable (with stereo end) to V300SD/Sportsman
  • Power on all Racepak devices, o2’s etc (and Grid if attached to RP)
  • Go into Datalink on your laptop
  • Click on File/Open Car configuration – and pick yours – this will load your setup
  • Click on the READ icon (about 5th item down on the tool bar on the left)
  • a box should pop up saying devices read successfully.
  • Click on File/Save


7761 setup to send the correct number of pulses to the Racepak


Sample Rate

Vnet sample rate is a per channel setting you have a choice of 25, 50 or 100. Right click on the channel button in your config and select the desired rate and click send config.


Getting the average of any of your channels (example is AF)

1. activate the AF channel
2. select the AF channel in the file/grid box at the top of the graph area.
3.  place the cursor on the start point and left click, then push the [ key on the keyboard - you will see a vertical red dot dash line appear
4. place the cursor on the end point of the time of interest and left click, then push the ] key on the key board another vertical red dot dash line will appear

to remove or change the time points hit ] then [


You got a new laptop

  1. Go Holley web site and download & install the latest version of Datalink - https://www.holley.com/support/data_acquisition/
  2. Perform a standard Windows installation and take all the defaults except when you get to the screen asking what Racepak gear you have - check off what you have only.
  3. If you have a V300sd re-install the security disk (details here...)
  4. Update the configuration with all the sensors in the car:
    1. Hook the laptop to the car.
    2. Start up datalink and load your configuration - Sportsman.RCG if you have a Sportsman and V300_xxxx if you have a V300SD.
    3. Go to FILE/Default Config - now this config will always load when you start datalink
    4. Click on READ on the toolbar on the left
    5. You should get a message saying new sensors found - say no for now.
    6. you should have on your screen your new config with all your current sensors
    7. click on FILE/SAVE
  5. Your laptop is now ready for downloads.

Optional step to copy old runs - REQUIRES significant computer skills.

  1. If you want to copy your your old runs from old to new laptop follow these steps (this takes some computer expertise - if you don't already know how to copy and paste files get help - don't call me when you are halfway thru and don't know what you did - just do it all from the start or get someone to help you that knows computers):
    1. Get a USB thumb or flash drive from an office supply store. Put it into the old laptop and windows will pop up a discovery message - click on open folder to view files and then minimize that window.
    2. Navigate to your C drive - C: (sometimes OS C:)
    3. then to RacePakData
    4. then Sportsman or V300_xxxx
    5. Highlight the year(s) and right click/copy
  2. Activate the widow for the thumb drive and paste the folders.
  3. Reverse the copy process on the new laptop.



How to E-mail a Run

  1. Go into your E-mail system.
  2. Start a new e-mail to your intended recipient
  3. click on Attach or possibly Insert (frequently has a paperclip icon)
  4. If a choice comes up select file/attachment NOT pictures.
  5. Use the Browse function to navigate to Computer
    1. then C: (sometimes OS C:)
    2. then to RacePakData
    3. then if you have a Sportsman to Sportsman, If an IQ3 Drag then IQ3. If a V300SD to V300SD_NNN (your serial number)
    4. then to the year & track and run (so if you are familiar with it the path would be something like C:\RacePakData\Sportsman\2015\atco\Spatc010115Q1.rpk
  6. add any message then click Send

If your laptop can not access the internet you can copy the selected file to a USB memory stick or flash drive then go to another computer and e-mail the fire from the USB drive.

If you have a V300, V300SD, LDX you will have to give your security key to the recipient (unless it's Racepak & RP dealers.To Do that:

  1. Open Datalink
  2. Click on Security
  3. Click on Show/Edit Security Keys
  4. In bottom left of this new screen find your serial number like V300 5252
    To the right is your 10 digit security code
  5. You have to manually copy the number and enter it into an E-mail to him (Windows Copy & Paste does not work). You could send it a text message or simply read it to him as well.
    Also in the e-mail tell him the type (first Column)
    The recipient has to do the same steps except at the top of the screen put your info in and click Add. He must add the type too.
    Click DONE



Change G-meter settings for reverse mount

  1. Go into Datalink
  2. right click on the Accell G meter
  3. in the top right hand corner of the box there will be a box labeled Specify Linear Conversion and it will have 4 numbers/boxes.
    now in the second box of Raw data value B where it defines what it will become put a - (negative symbol) before the number.
  4. Click on Send Configuration in the bottom right
  5. Click in File / Save



Shock sensor setup

First right click on the shock sensor channel in question in your config.

In the top right box where this one says 8 that should match the full travel of your sensor - in inches.

Also the second box is the enable which is changeable once you highlight the Channel Mode.

If you do change anything click on Send Config (must be hooked to car).


How to get your Sports/IQ3D systemID or Firmware/Product Version

You need systemid, product version (same as firmware level) and max v-net channels connected to order a channel upgrade/unlock.


  1. Hook your laptop to the Sportsman/IQ3d & turn power on to Sportsman/IQ3d
  2. go into DataLink and open your config (SPORTSMAN.RCG or IQ3D.RCG)
  3. Click on the READ icon on the tool bar on the left (or Edit-Read V-net)
  4. Right-click on the Sportsman channel button. If IQ3D, right click on IQ3 Logger and then click on the Dash Info tab.
  5. Highlight the system ID line within the System Options box in the bottom left
  6. Your system ID will appear in a box on the right - in the example below : x1a4604
  7. To get a channel upgrade, you will need this and Product Version and Max Vnet channels allowed.
  8. Product Version is one line above.



How to enter a channel update code
  1. Connect PC to IQ3D / Sportsman unit with serial cable
    Turn power on the the system
  2. Open DataLink software on your laptop
  3. Go to File, Open Car Configuration
  4. Right click on IQ3 Logger button or if you have Sportsman then Sportsman
  5. Left click on dash info tab.
  6. You will get the screen below and then highlight the V-net update code in the System Options box in the bottom left.
  7. paste the code into the update field (11111) shown in example.
  8. Left click on Send Configuration button which is almost at the bottom right.
  9. Left Click on OK to small box
  10. Left click on OK to big box
  11. Left click on File/Save


How to connect a MSD Power Grid

1. Use a V-net T cable with the straight end into the Grid harness and the T end anywhere in your V-net network.

2. If you have a Sportsman, you must be on Datalink 4.8.8 or higher and your firmware must be Product Version 5 or above. To check Datalink version, load Datalink, go to Help and click on about. To check your Firmware/Product Version click here Firmware . Each Grid channel uses one Sportsman channel so usually you only enable timing.

3. If you have a IQ3 drag dash keep in mind that each Grid channel uses one channel so usually you only enable timing.

4. You must ENABLE whatever channels you want in the Grid software (Some early Grid 7730's have all channels enabled so you have to DISABLE all but the ones you want)

5. Once your Grid channels are enabled and wiring done turn the power on to your Racepak and turn on ignition switch to activate the Grid.

6. Connect your laptop to the your Racepak unit. Open Datalink and your config file on the laptop and do a READ VNET. This should bring in the enabled Grid channels. They will show as MSD Ignition Timing etc. click on file/save to save your config. If the Grid channels do not appear review the steps above.

7. Now your data logs will show the new channels.

Youtube video with more info: Grid

How to Diagnose no DS RPM

1. I do not know of any ohm test to verify the sensor.

2. Check the gap from collar/magnet to sensor - it should be .050-.080".

3. Inspect the sensor for damage. It's easy to over tighten the two nuts and crack the sensor body.

4. Check power & Ground to the sensor:
Unplug sensor from the cable. The terminal at the top of the diagram to the right should have full battery voltage, the bottom terminal should be a good ground.

5. Confirm the magnets have the south side pointed towards the sensor. Collars that did not come from a Racepak dealer may not be oriented correctly. Your Racepak sensor came with a yellow checking magnet and the checking procedure. Remove the collar to make sure the magnets are not loose. Some use a retaining spring which can come loose, some are insufficiently glued. Magnets occasionally get weak particularly from heat. This is hard to test - sometimes decreasing the gap to absolute minimum helps.

6. Test the harness/system by starting a telemetry session and with a small screw driver momentarily jump from ground to signal with quick momentary motion. The DS RPM should show low numbers (12 - 50 - 6 for example). If you get DS RPM in this test then the sensor or magnets/collar is bad.




How to Download/replace  a Configuration file sent to you (GMAIL)

This procedure assumes your Email is on the laptop you run Datalink from.


This will open Datalink with your changes.

Go to File, Save As and you should get the following screen. It MUST say Sportsman in the save In box. You may have to navigate with the drop down arrow shown below so the result is C:\RacePakData\Sportsman

Click on Save

exit Datalink

Go back into Datalink and make sure your new channels are there.

How to create multiple Sportsman steups in one laptop

Caution! do not do this unless you are familiar with Windows Copy / Paste and Rename. Get a computer person to help you. Some of the screen shots below will change with different Windows versions. If you get it jacked-up you will have to re-install Datalink from your stick.

  1. In Windows File Explorer navigate to your C: drive. You may have an icon on your tool bar that looks like a tan file folder or you can go to My PC or type in explorer in the search bar.
  2. Open RacePakData folder(double click or Open) and you should get this:
  3. Right click and copy this Sportsman folder (you may have to go to show more options to get the copy function).
  4. Right click out in the white area and choose paste. This will create Sportsman (copy):
  5. .


  1. Right click on the Sportsman folder and select Rename (you may have a choice – show more options and then Rename will be available. Replace the highlighted Sportsman with your car name/nickname (no more than 10 characters and no spaces). For this example I chose SC-Dragster.
  2. Then Open your new folder (SC-Dragster), highlight Sportsman_Config.RCG, right click and rename it to the same name (SC-Dragster.RCG). Your screen should look like this:
  3. Go up one folder level (view the contents of RacePakData)
  4. Right click on folder Sportsman (copy ) and rename it to Nova (or whatever name/nickname you choose) and you should have this:
    • Open the Nova folder (double click) and rename Sportsman.RCG to Nova and you are finished.


    Machining a collar to a new size

    1. Use .040 spacers between halves (without the spacers the collars are not round. They measure true across the parting line)
    2. keep heat down as 200*F will hurt magnets
    3. if you remove magnets make sure you get south side facing out


    How to E-mail a Configuration File

    1. Go into your E-mail system.
    2. Start a new e-mail to your intended recipient
    3. click on Attach or possibly Insert (frequently has a paperclip icon)
    4. If a choice comes up, select file/attachment NOT pictures.
    5. Use the Browse function to navigate to Computer
      1. then C: (sometimes OS C:)
      2. then to the RacePakData folder
      3. then
        1. if you have a Sportsman recorder go to Sportsman folder, and select Sportsman_Config.RCG
        2. if you have a IQ3 Drag then IQ3 folder and select IQ3drag.
        3. If a V300SD go to V300SD_NNN (your serial number) folder and select V300SD_NNNN.RCG
    6. add any message you want to include then click Send

    If your laptop can not access the internet you can copy the selected file to a USB memory stick or flash drive then go to another computer and e-mail the fire from the USB drive.



    How to measure for the DS collar

    Factory yokes usually do not have a concentric spot. They need to be machined or replaced with an aftermarket yoke.

    How to overlay runs

    1. You must have previously downloaded the runs onto your laptop. To view downloaded runs go to File/OPEN and locate the runs in the year/track folders.
    2. You must set the start point (or Zero time) for each of the runs. To set the start point:
      1. File/Open a run.
      2. Use the Zoom (+) and/or the large red arrows to position & size the run.
      3. Place the cursor (left click) where the trans-brake releases and the engine RPM jumps up off the 2-step.
      4. Use the  right & left arrows on the keyboard to position the cursor exactly at the launch point. You can observe the Accel G-meter channel to help with this. DO NOT use drive shaft movement to set the start point. 
      5. Click on the green T on the toolbar on the left side of the screen.
      6. Click on File/Save then File/ Close.
      7. Repeat above for all runs you want to overlay.
    3. Now that you have the start point set for all runs you want to overlay you can open them.
    4. Make sure channel mirroring is off (VIEW / CHANNEL MIRRORING)
    5. Click on File/Open and navigate thru the year/track folders and open the first run.
    6. Click on File Open and navigate thru the year/track folders and open the second run.
    7. The runs will now be on your screen overlaid. You can choose one of the runs (say run1) and change the colors of the channels you are most interested in by repeatedly clicking  the channel button so you get a good contrast. At the top of the graph area are tabs for the two runs – you click on the tab and then the data value in the channel box will be for that run.

    If the runs don’t quite line up close all the files and re-set the start point for whatever run and then resume with step 3.



    How to enable shock sensors

    Open your configuration and right click on the shock channel. The screen below will appear. Left click to highlight Channel Mode (Note the highlighted Channel Mode & Enable/Disable). Select enable on the right side drop-down and then click on Send Configuration. Also, verify the length of the sensor in the sensor window (2nd column, 3rd line) - in this example; 8 inch to match what's in the car.

    How change DS pulses on one data log

    Its common that the Channel setup is mismatched with the actual number of magnets on the DS collar. The result might be a DS RPM of 28,000 when it's should be 7,000 (2 pulses in setup but 8 mags on collar)- or maybe DS RPM of 4000 when it should be 8000 (8 pulses in setup but 4 actual magnets). There is a Tech Tip above to fix it permanentely. To fix it for one data log follow these steps:

    1. Open log
    2. Right click on DS RPM
    3. Verify number of pulses is wrong in the way that you believe (count ACTUAL magnets on the collar vs Pulses Per Revolution shown below)
    4. Change the Raw data B will become cell to the factor to correct the error (if you are getting 4 times the correct DS RPM then put in .25 where the example has .5. Or if you show 1/2 the correct number, enter 2 in that cell)


    How change pressure sensor scaling

    Occasionally you need to change a pressure range. For example if you changed from a carb to fuel injection, your fuel pressure isn't 7lbs, it's over 100. You need a new pressure sender and you have to change the scaling inside your v-net module to match.

    1. open your car configuration in Datalink

    2. Right click on the pressure channel to be changed

    3. Use the drop down arrows shown below in highlight 1 to select Pump Pressure and 0-150.

    4. The result should look like highlight 2.

    5. Click on send configuration - highlight 3.

    6. you should get a message saying devices programmed successfully and click OK

    7 click of File/save


    Understanding Vacuum

    A. Pan Vacuum

    Pan or crankcase vac is created by your vacuum pump. Without a vac pump, you will probably have a samall amount of pressure in your crankcase. Some Stock eliminator cars use a PCV valve to create a small amount of vac and the pan-e-vac systems with hoses running from the valve covers to the header collectors. Blown cars with the 1 1/4" vent hoses going into a 1 gallon can would not have presure or vac (possibly a blown head gasket or worse would show pressure).

    Vac is measured in inches Hg - it's not a negative number. Typical vac numbers are 12 to 18 inches.

    Racepak sensor setup to read in inches:



    12 volt Event