Re: Separating the power and signal grounds on a V3 board
Posted: Sat Apr 20, 2013 5:49 am
Ok so I have been doing tons of reading and am quite angry at the moment considering the $430 dollars I spent on this MS2 V3.0 board.
I have been having running issues from the get go. The car runs but not great. After research I found that people would install a cap either in the bootloader(h1) or from center of Q3 to Q9 to fix the battv spikes i was seeing. So I did this and everything seemed normal except that my VR input was noisy at times. So I just recently purchased the BrickRPM from Fred. After installing it in the car it ran great, no jittery timing very smooth all around. Next day horrible resets and rpm spikes all over. Also if i turn on my Knock settings the car will not even idle.
I am running single coil ignition/distributor using the built in driver and low impedance 440cc supra injectors. I believe this to be(after much reading) the source of all my problems since people are seeing the ground plane actually rise up by 2v. The situation is probably made worse because I am using the megasquirt relay board.
Here is my plan A...
1. Ditch the relay board
2. Use separate ground return for Ignition Driver(Q16) and Injector PWM drivers (Q3 and Q11)(not sure what else to add).
Plan B...
1. Ditch the V3.0 and relay board to some poor soul
2. try to get as much as I can for number 1
3. Buy v3.57 and rewire my engine harness
I have been having running issues from the get go. The car runs but not great. After research I found that people would install a cap either in the bootloader(h1) or from center of Q3 to Q9 to fix the battv spikes i was seeing. So I did this and everything seemed normal except that my VR input was noisy at times. So I just recently purchased the BrickRPM from Fred. After installing it in the car it ran great, no jittery timing very smooth all around. Next day horrible resets and rpm spikes all over. Also if i turn on my Knock settings the car will not even idle.
I am running single coil ignition/distributor using the built in driver and low impedance 440cc supra injectors. I believe this to be(after much reading) the source of all my problems since people are seeing the ground plane actually rise up by 2v. The situation is probably made worse because I am using the megasquirt relay board.
Here is my plan A...
1. Ditch the relay board
2. Use separate ground return for Ignition Driver(Q16) and Injector PWM drivers (Q3 and Q11)(not sure what else to add).
Plan B...
1. Ditch the V3.0 and relay board to some poor soul
2. try to get as much as I can for number 1
3. Buy v3.57 and rewire my engine harness