Flashing a MegaSquirt PNP to the HighRes firmware

[saboteur]

So, my MegaSquirt PNP is now running HighRes! Overall, I'm impressed with the change, it seems to idle more like it did with the stock computer. I had to fine tune my idle a bit but that didn't take long.

If you notice you get a slight miss randomly, Jerry from DIYAutoTune.com has the solution.

Here are the steps you can take to install HighRes:

1. Download the latest HighRes firmware image from the MS1 development section of msextra.com or use one of my MSPNP HighRes firmware images. If you use one of my images, you can now skip to step 4.

2. Grab msns-extra.s19 and msns-extra.ini from the zip file, discard the rest.

3. Mod msns-extra.s19 with EasyTherm so it uses the same values as the standard MSPNP firmware.

4. Make a copy of your current MegaSquirt project folder. My old project folder was called "MSPNP MM9093 with AFM", so I made a copy called "MSPNP MM9093 with AFM HR10e".

5. Copy msns-extra.s19 and msns-extra.ini into the new project folder created in step 4. Also drop another copy of msns-extra.s19 into the "src" subfolder.

6. Unplug your ignitor.

7. Run download-firmware.bat from the new project folder.

8. Fire up MegaTune, choose your new project then load your old MSQ. You will get a few warnings, check the audit.log to ensure nothing is too serious. Once the MSQ is loaded, switch the car off again.

9. Plug the ignitor back in.

10. Start the car on HighRes!

For 10f and earlier: If you experience a rev limiting problem at around 2500rpm, upgrade to 10g or disable air density correction.

Important disclaimer: If this breaks stuff, it's not my problem. Use at your own risk.

[saboteur]

If you have any further questions about this procedure or you would like to request other images, please feel free to discuss in the MegaSquirt section of this site.

[saboteur]

When it asks if you are running the original code you should answer "no" as you are running the MSnS-Extra code. The boot jumper is only required if you are running the original B&G firmware. The B&G firmware doesn't even support ignition (it's fuel only) so you definitely aren't running that.