its harder way when this one...jsmcortina wrote:Can't you just wire it up in the normal way like in the manual ?
James
Megasquirt ON BMW m52 Engine
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Re: Megasquirt ON BMW m52 Engine
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Re: Megasquirt ON BMW m52 Engine
Yes, but one way or another IGN power isn't sufficient for main power and a relay must be used. The BMW already has a nice main power relay, but the stock ECU sends a ground signal to trigger it. Therefore an NPN is required to create a ground signal from IGN.jsmcortina wrote:Can't you just wire it up in the normal way like in the manual ?
James
It works very nicely and there's not an extra relay floating around.
It looks like you would just switch 87 with 30. Megasquirt will get power from your relay pin 30.maxo-tt1 wrote:hello people...
have one problem about start circuit.. i use my siemens wiring, and reley are different. can someone help me modify diagram above ?
that diagram says that on bosch relay 30 and 86 are battery voltage.
on my siemens reley i got voltage in only 87
this is my reley... maybe someone know how to remake it ?
Re: Megasquirt ON BMW m52 Engine
aha, Thats right. but what about 85 and 86? i need to get +12v on 86?maxo-tt1 wrote: It looks like you would just switch 87 with 30. Megasquirt will get power from your relay pin 30.
and on your power diagram, power goes from collector into pin 27 or from 27 to collector?
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Re: Megasquirt ON BMW m52 Engine
Fair enough, however for some installers a relay might be easier and more robust and doesn't involve fiddly electronic components.hoveringuy wrote:Therefore an NPN is required to create a ground signal from IGN.
It works very nicely and there's not an extra relay floating around.
James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk
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Re: Megasquirt ON BMW m52 Engine
and one more problem(i think)
i get +12v on coil PIN-s of bmw 88 pin connector
as i know on that pins megasquirt provides ground yes?
and also on injector PINs... comes 12v...
is it normal?
i get +12v on coil PIN-s of bmw 88 pin connector
as i know on that pins megasquirt provides ground yes?
and also on injector PINs... comes 12v...
is it normal?
Re: Megasquirt ON BMW m52 Engine
The coils should get 12v to power them. Then the MS sends a low volt signal to them to ground them out. There are 3 wires that go to the stock coils. 1 is power, 1 is signal, and 1 is the signal ground (no 4th because the body of the spark plug grounds through the engine head). I haven't read how you are outputting spark but it gives a signal not a ground.
The Injectors on the other hand will get power when the ECU is on and the MS grounds them.
does that make sense?
The Injectors on the other hand will get power when the ECU is on and the MS grounds them.
does that make sense?
-Yoshi-
Re: Megasquirt ON BMW m52 Engine
aha, you're right. but in signal pin comes 12v, where ms sends low volt signal... and this voltage goes in MS3x coil pins... thats why i think that there is not everything ok...protomor wrote:The coils should get 12v to power them. Then the MS sends a low volt signal to them to ground them out. There are 3 wires that go to the stock coils. 1 is power, 1 is signal, and 1 is the signal ground (no 4th because the body of the spark plug grounds through the engine head). I haven't read how you are outputting spark but it gives a signal not a ground.
The Injectors on the other hand will get power when the ECU is on and the MS grounds them.
does that make sense?
and when i check injector, in both wire comes 12v... from signal as well...
here on img 3 coil pin, where ms should send signal, but on this pins comes voltage (with stock bmw confiuration... i've changed nothing... just switched off ECU and tested pins with multimeter)
Re: Megasquirt ON BMW m52 Engine
I'm not quite sure what you mean.
You can do this with the stock harness. I've seen others do it. I made my own harness though. The injectors should have 2 wires. 1 is a power, the other goes to the MS. That's really all you need.
The coils are similar. 1 should be power, 1 should go to the MS and 1 should ground.
You can do this with the stock harness. I've seen others do it. I made my own harness though. The injectors should have 2 wires. 1 is a power, the other goes to the MS. That's really all you need.
The coils are similar. 1 should be power, 1 should go to the MS and 1 should ground.
-Yoshi-
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Re: Megasquirt ON BMW m52 Engine
You need to be careful how you measure things...maxo-tt1 wrote:, you're right. but in signal pin comes 12v, where ms sends low volt signal... and this voltage goes in MS3x coil pins... thats why i think that there is not everything ok...
and when i check injector, in both wire comes 12v... from signal as well...
here on img 3 coil pin, where ms should send signal, but on this pins comes voltage (with stock bmw confiuration... i've changed nothing... just switched off ECU and tested pins with multimeter)
If you have +12v feeding one wire of an injector, and you measure the voltage on the other wire while it's not connected to anything else, you will read +12v (even though that's where the injector gets grounded).
With no current flowing through the injector/coil/whatever the voltage is equal at all points.
Re: Megasquirt ON BMW m52 Engine
oho.. very useful post. thanks... i'll check tomorrow again...hoveringuy wrote:You need to be careful how you measure things...maxo-tt1 wrote:, you're right. but in signal pin comes 12v, where ms sends low volt signal... and this voltage goes in MS3x coil pins... thats why i think that there is not everything ok...
and when i check injector, in both wire comes 12v... from signal as well...
here on img 3 coil pin, where ms should send signal, but on this pins comes voltage (with stock bmw confiuration... i've changed nothing... just switched off ECU and tested pins with multimeter)
If you have +12v feeding one wire of an injector, and you measure the voltage on the other wire while it's not connected to anything else, you will read +12v (even though that's where the injector gets grounded).
With no current flowing through the injector/coil/whatever the voltage is equal at all points.
i feel that i have very little problem but cant catch it... everything looks to be ok... got signal from all sensors in tunerstudio... when i try to start engine, it writes in green cranked, synced and something else.. no errors in red... but engine not starts i think its coils... because injector flows fuel...
Re: Megasquirt ON BMW m52 Engine
can someone tell me how to test coil driver with multimeter? i've removed it from stock siemens ecu.. and maybe it not works as bosch one?
i've done coil wiring according this
maybe siemens needs wiring done differently?
i've done coil wiring according this
maybe siemens needs wiring done differently?
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Re: Megasquirt ON BMW m52 Engine
Can't just be tested with a multimeter. You'll need to connect the pin on the right to a ground, then use the the middle pin to sink a load. (12v light bulb, for instance). Bulb should light when +5v is applied to the left pin.maxo-tt1 wrote:can someone tell me how to test coil driver with multimeter? i've removed it from stock siemens ecu.. and maybe it not works as bosch one?
maybe siemens needs wiring done differently?
Re: Megasquirt ON BMW m52 Engine
thanks.. i'll test it asap.hoveringuy wrote:Can't just be tested with a multimeter. You'll need to connect the pin on the right to a ground, then use the the middle pin to sink a load. (12v light bulb, for instance). Bulb should light when +5v is applied to the left pin.maxo-tt1 wrote:can someone tell me how to test coil driver with multimeter? i've removed it from stock siemens ecu.. and maybe it not works as bosch one?
maybe siemens needs wiring done differently?
one more question please
as i noticed today, injectors doesn't flow fuel as well when i open ignition switch, 1 and 3(or 4) injector flows for a second and then stops... as stock ecu does... it seems to be normal... but not when i try tu start engine...
may incorrect cam sensor be the reason of this problem? (that injectors doesn't flow?) i've bought bosch one, but not sure it m50 or m44 cam...
and i use your msq file on alpha 18... with no changes... it seems everything is same in m54 and m52... how do you think?
i use sequential injection
please someone tell which are main sensors, that are must for correct fuel flow? no signal goes from ecu to injectors...
i ask it to double check wiring...
and one moer question.
bosch hall cam senor needs +12v or 5v?
Re: Megasquirt ON BMW m52 Engine
i've just tried it... bulb not lightshoveringuy wrote:Can't just be tested with a multimeter. You'll need to connect the pin on the right to a ground, then use the the middle pin to sink a load. (12v light bulb, for instance). Bulb should light when +5v is applied to the left pin.maxo-tt1 wrote:can someone tell me how to test coil driver with multimeter? i've removed it from stock siemens ecu.. and maybe it not works as bosch one?
maybe siemens needs wiring done differently?
Re: Megasquirt ON BMW m52 Engine
I just bought 2 of the DIYAutotune.com spark boxes. Means you have 2 spare if they ever break lol.
-Yoshi-
Re: Megasquirt ON BMW m52 Engine
sorry but what's spark box? link pleaseprotomor wrote:I just bought 2 of the DIYAutotune.com spark boxes. Means you have 2 spare if they ever break lol.
Re: Megasquirt ON BMW m52 Engine
oops.. my bad... i've done wiring wrongly at first time...maxo-tt1 wrote:i've just tried it... bulb not lightshoveringuy wrote:Can't just be tested with a multimeter. You'll need to connect the pin on the right to a ground, then use the the middle pin to sink a load. (12v light bulb, for instance). Bulb should light when +5v is applied to the left pin.maxo-tt1 wrote:can someone tell me how to test coil driver with multimeter? i've removed it from stock siemens ecu.. and maybe it not works as bosch one?
maybe siemens needs wiring done differently?
now it lights... so drivers are ok.... but engine still not starts...
can someone look at my log please?
p.s
can someone help me troubleshoot the problem? i'll pay 100-200$ for it...
Re: Megasquirt ON BMW m52 Engine
http://www.diyautotune.com/catalog/quad ... p-481.html
that's the spark box.
I'll look at the log when I get a chance at home.
that's the spark box.
I'll look at the log when I get a chance at home.
-Yoshi-
Re: Megasquirt ON BMW m52 Engine
i think i don't need this boxprotomor wrote:http://www.diyautotune.com/catalog/quad ... p-481.html
that's the spark box.
I'll look at the log when I get a chance at home.
please someone look at my log
Re: Megasquirt ON BMW m52 Engine
There's no RPM signal in this datalog. Can you spit out a composite log and trigger log for me?
edit: too lazy to look back.Do you have the 10k resistor in line with your crank signal? If not, it's def needed.
edit: too lazy to look back.Do you have the 10k resistor in line with your crank signal? If not, it's def needed.
-Yoshi-