Installing The Software

Software:

This guide requires the following software:


Step 1:

  1. Install the Megatune software onto your laptop.
  2. Run the installation software for MegaTune allow the software to install to the default location.
  3. Extract hr_10g.zip. Run copy-ini.bat.

Step 2:

  1. Create your Firmware file (only necessary if you're running parallel).
  2. Open EasyTherm
  3. Change the 'Code Version' (towards the bottom on the RHS of the screen) to "Custom"
  4. Change the port to your port (COM 1 or what-ever it is) on the bottom of the screen
  5. Change the 'Coolant and Air Temp' settings to your desired settings;

90-93: Use Rx7 defaults for the CLT and GM defaults for the AIT.

  • Piggyback with R7 installed: Use 1280 for CLT and 1450 for AIT for the bias.
  • Piggyback without R7: Use 2625 for CLT and 1450 for AIT for the bias.
  • Piggyback without R7 or R4 (recommended for piggyback sharing the sensors): Use 2625 for CLT and 3475 for AIT for the bias.
  • Standalone: Bias will be 2490 for each.

If 94-95: Use Rx7 defaults for the CLT and GM defaults for the AIT.

  • If piggyback with R7 installed: Use 910 for CLT and 1450 for AIT for the bias.
  • If piggyback without R7: Use 1450 for CLT and 1450 for AIT for the bias.
  • If standalone: The bias will be 2490 for each.

CLT Values:

deg F Easytherm values
-4 16150
104 1150
176 330

AIT values for 90-93 AFM flapper (if used)

deg F Thermistor resistance
-4 16000 ohms
68 2450 ohms
140 580 ohms

If 96-97: Resistance scale pending.

  • If piggyback with R7: Use 790 for CLT and xxxx for AIT for the bias.
  • If piggyback without R7: Use 1544 for CLT and xxxx for AIT for the bias.
  • If standalone: The bias will be 2490 for each.

If 99-00: (ECU CLT BIAS 1544; just my notes ignore)

  • If piggyback with R7: Use 790 for CLT and xxxx for AIT for the bias.
  • If piggyback without R7: Use 1544 for CLT and xxxx for AIT for the bias.
  • If standalone: The bias will be 2490 for each.
deg C Easytherm values
0 6000
40 1100
80 320

  • Once you have changed the settings, click on the "Write .inc and .s19 Files" button on the bottom of the EasyTherm screen
  • The file that you want to write to is the 'msns-extra.s19' file in the C:\EFI\ folder in the hr_10g file that you unzipped to earlier.

Let’s flash that file

IF YOU ARENT USING A STIM, UNPLUG YOUR COILS/IGNITORS!

  1. Put a jumper on the boot pin on the MS motherboard and power up the Stim/ Ignition to ON. (FIG 1)
  2. Click "upload to MS" Choose the 'msns-extra_mod.s19' file in C:\EFI\ (Don't touch a thing on your computer after this or it will freeze)
  3. It will write about 1775 lines, if it doesn’t do it again from step 2.
  4. Unpower the MS and remove the boot jumper.
  5. Once this has finished you will need to copy the "airdenfactor.inc", the "matfactor.inc" and the "thermfactor.inc" files from Program Files > EasyTherm into Program Files > Megasquirt > MegaTune2.25 > mtCfg
  6. Once that is all done, open MegaTune, check that the commuincations is going through the same COM port as before, and if you see the guages in MegaTune giving some readings you can now download your .msq onto the ECU and you're good to go.
new_fan.jpg

Lets get you Tuneing.....

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