12v noise
Moderators: jsmcortina, muythaibxr
12v noise
I'm having big issue with noise on the 12v of the car.
I installed a ms1extra last year. Everything was working fine. Then this winter, the owner of the car rebuilted the engine.
Engine: 2jz-gte
running ms1 with low impedance injectors with a resistor pack
3x MSD twin towers coil pack drive by original igniter.
After the rebuild, the guy was having troubles with hard cuts on with the ms. There is so much noise that the ecu reset everytime he hit boost and fews times at idle...
I double checked all grounds and everything is like before. I'm already using a capacitor on the igniter.
I can add a capacitor to the MS but this wont solve my problem... I will try to add a capacitor near the twin towers coils pack.
But I still dont understand why is was running well last year.
This is what it look like at 1000 rpm. Noise increase with rpm
I installed a ms1extra last year. Everything was working fine. Then this winter, the owner of the car rebuilted the engine.
Engine: 2jz-gte
running ms1 with low impedance injectors with a resistor pack
3x MSD twin towers coil pack drive by original igniter.
After the rebuild, the guy was having troubles with hard cuts on with the ms. There is so much noise that the ecu reset everytime he hit boost and fews times at idle...
I double checked all grounds and everything is like before. I'm already using a capacitor on the igniter.
I can add a capacitor to the MS but this wont solve my problem... I will try to add a capacitor near the twin towers coils pack.
But I still dont understand why is was running well last year.
This is what it look like at 1000 rpm. Noise increase with rpm
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- Super MS/Extra'er
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Re: 12v noise
Where is the MS getting power and ground?
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: 12v noise
From b+ (factory ecu 12v) and a good body ground.
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
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Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
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- Super MS/Extra'er
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Re: 12v noise
In my experience, there's rarely such a thing as a good body ground. I recommend grounding the MS to the engine block or cylinder head. There's a reason most OEM wiring harnesses do this.Suprazz wrote:From b+ (factory ecu 12v) and a good body ground.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: 12v noise
ok I'll try this.
BTW this is what it look like when I hit boost. I add a 220uF capacitor to the ms so it help a little bit for the noise at idle. You can see while rpm are growing, noise increase and at ~10 psi I always have a big glich and the ecu reset and I'm also loosing the communication with TS.
BTW this is what it look like when I hit boost. I add a 220uF capacitor to the ms so it help a little bit for the noise at idle. You can see while rpm are growing, noise increase and at ~10 psi I always have a big glich and the ecu reset and I'm also loosing the communication with TS.
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
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Re: 12v noise
little update.
You were right, a good engine ground is a WAY better than a body ground.
But I still have my problem.
This time, I kept the pedal to the floor and it keeps resetting.
You were right, a good engine ground is a WAY better than a body ground.
But I still have my problem.
This time, I kept the pedal to the floor and it keeps resetting.
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
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- Super MS/Extra'er
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Re: 12v noise
Can you post a data log of the resets?
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: 12v noise
yes but almost every time I'm loosing communication after the first "cut"...
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
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- Super MS/Extra'er
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Re: 12v noise
Try soldering a 0.1 uF capacitor across the boot header.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: 12v noise
I added a 0.22uF between pin 2 and 6 of the CPU and also between pin 1 and 2.
I also added a 1nF to the bootloader jumper.
And a 220uF on the 12v input of the megasquirt
I also added a 1nF to the bootloader jumper.
And a 220uF on the 12v input of the megasquirt
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
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Re: 12v noise
Why so small?Suprazz wrote:I also added a 1nF to the bootloader jumper.
James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk
My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
Re: 12v noise
Is your fuel pump powered from the same line that feeds the Megasquirt?
I fought with similar issues for a long time and finally set up the fuel pump to draw power from another circuit and the problems vanished.
I fought with similar issues for a long time and finally set up the fuel pump to draw power from another circuit and the problems vanished.
Eric Law
1990 Audi 80 quattro with AAN turbo engine: happily running on MS3+MS3X
2012 Audi A4 quattro, desperately in need of tweaking
Be alert! America needs more lerts.
1990 Audi 80 quattro with AAN turbo engine: happily running on MS3+MS3X
2012 Audi A4 quattro, desperately in need of tweaking
Be alert! America needs more lerts.
Re: 12v noise
Ok, I'll try bigger on the bootloader jumper.
Yes the fuel pump is on another circuit.
Yes the fuel pump is on another circuit.
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Re: 12v noise
I made other tests, It changed nothing. I added a bigger capacitor on the bootloader jumper.
I dont know why but yestesday, the car was running a way too rich. The day before yesterday, idle was a 14,7. Yesterday, I after the warmup, i was running less than 11 a idle and idling was hard.
And Same problem, I have an other datalog.
I dont know why but yestesday, the car was running a way too rich. The day before yesterday, idle was a 14,7. Yesterday, I after the warmup, i was running less than 11 a idle and idling was hard.
And Same problem, I have an other datalog.
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
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Re: 12v noise
Lets get back to basics here.
Nothing changed with the Megasquirt over the winter but now the car is running badly ?
Don't look at the Megasquirt! Look at what else changed on the car.
James
Nothing changed with the Megasquirt over the winter but now the car is running badly ?
Don't look at the Megasquirt! Look at what else changed on the car.
James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk
My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
Re: 12v noise
I had a simmilar issue with my VR6 turbo when i first got it running and i have a noisy 12v Batt signal and I chased my tail for months only to find out I carelessly put factory Spark plugs in the car and under boost they where detonating as they run hot (platnum +4's). Im not saying that is your issue but the wrong spark plugs in a car that boosts more then it should will give you a nasty bucking hesitation during boost but drive regular while cruising.
Its worth looking at your plugs before you start ripping your MS apart like i did. May be wrong but its easy enough to try.
Its worth looking at your plugs before you start ripping your MS apart like i did. May be wrong but its easy enough to try.
Re: 12v noise
good to know.
I noticed yesterday that the car is running with ngk g-power spark plug and normally I use ngk copper type or v-power but I didn't try to change the sparkplugs.
Now car is running a way better (I moved few other grounds but I'm still don't understand what's happening). I can make pulls and run the car run great but the ms reset is still happening under boost.
I noticed yesterday that the car is running with ngk g-power spark plug and normally I use ngk copper type or v-power but I didn't try to change the sparkplugs.
Now car is running a way better (I moved few other grounds but I'm still don't understand what's happening). I can make pulls and run the car run great but the ms reset is still happening under boost.
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Re: 12v noise
Ok,
I changed the megasquirt for an other one of a friend.
Car is running a way to rich with the exact same progarmmation.
The megasquirt of my fried don't reset but I'm always loosing communication with tunerstudio 1.50
I changed the megasquirt for an other one of a friend.
Car is running a way to rich with the exact same progarmmation.
The megasquirt of my fried don't reset but I'm always loosing communication with tunerstudio 1.50
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
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- Super MS/Extra'er
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Re: 12v noise
MegaSquirt installations should pass this test:
if you unplug MS box and measure resistance from any sensor's (MAT, CLT, TPS) ground to car/engine ground , you should not have continuity.
if you unplug MS box and measure resistance from any sensor's (MAT, CLT, TPS) ground to car/engine ground , you should not have continuity.
Peter Florance
PF Tuning
81 BMW Euro 528i ESP Car
60-2 Wheel LS2 Coils, Low Z Inj
Co-Driver 1999 BMW E46 DSP car.
PF Tuning
81 BMW Euro 528i ESP Car
60-2 Wheel LS2 Coils, Low Z Inj
Co-Driver 1999 BMW E46 DSP car.
Re: 12v noise
Thank you. This solve my problem. I realised that the MAT and TPS were grounded on the intake manifold.
Now everything work a way better.
Btw with all this problems, I realised that the maximum and minimum baro correction limits don't seems to work on 029y4 because when the ms reset, baro was at ~140 kPa and my maximum was set a 105.
Now everything work a way better.
Btw with all this problems, I realised that the maximum and minimum baro correction limits don't seems to work on 029y4 because when the ms reset, baro was at ~140 kPa and my maximum was set a 105.
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!