How to Megasquirt your 3G Hemi

[darndart]

I bought the gold box and harness for mine but have yet to fire it up on it.

Keep us posted!

 

['Cuda_ragtop]

Any updates?
----o00o--'(_)'--o00o----

 

[toplscuda]

Nope. House renovations seem to keep getting in the way

 

[toroddandre]

They support them, but I don't know anyone who had used that yet (knock sensors on either of those two boxes).

I have the knock board in my ms3x. May try to wire up the knock sensors.

The issue is the hemi knock sensor isn't 'tuned'. So, the tuning needs to be done in the computer. If you want to tackle it, I've got the frequencies somewhere I can send you...

I would really love to know those frequencies.. as i'm in the prosess of tuning my MS3

Else: Thanks for really great writeup

 

[Map63Vette]

So I know this is an old thread, but I was thinking about starting up my own chronicling my Megasquirt adventure on my car and wanted to read through this one briefly again to get an idea of what was already out there. Regarding knock control, I have it set up on my car right now running an MS3X with the internal knock module (well, a clone module, but it's the same chip).

The frequencies are based on physical dimensions, so nothing too black magic. There are several calculators online for it. Bore diameter is pretty much what determines it. The decision you make from that point is whether you listen for the primary frequency or one of the later order harmonics (for instance, if your primary frequency was 100 Hz, you could also pick up knock listening at 200 Hz). There are other settings and methodologies/theories for how to actually tune them besides that. I tried pulling some stock values out of an HP Tuners tune for my engine, but they ended up causing more issues so I went back with more generic theory values. I can pull up my tune and get some screenshots later if anyone is still interested all these years later. I'll probably still start up my own thread as I've learned a lot over the years and felt like sharing for anyone interested in hearing.

 

[Cuda416]

So I know this is an old thread, but I was thinking about starting up my own chronicling my Megasquirt adventure on my car and wanted to read through this one briefly again to get an idea of what was already out there. Regarding knock control, I have it set up on my car right now running an MS3X with the internal knock module (well, a clone module, but it's the same chip).

The frequencies are based on physical dimensions, so nothing too black magic. There are several calculators online for it. Bore diameter is pretty much what determines it. The decision you make from that point is whether you listen for the primary frequency or one of the later order harmonics (for instance, if your primary frequency was 100 Hz, you could also pick up knock listening at 200 Hz). There are other settings and methodologies/theories for how to actually tune them besides that. I tried pulling some stock values out of an HP Tuners tune for my engine, but they ended up causing more issues so I went back with more generic theory values. I can pull up my tune and get some screenshots later if anyone is still interested all these years later. I'll probably still start up my own thread as I've learned a lot over the years and felt like sharing for anyone interested in hearing.

Old thread or not, I'd be very interested as my son is planning on a 3G swap into a 90' Dakota and the MS ECU's are intriguing.