E30 m20b25 Turbo

[Chauffage]

Hi guys ! My name is Hans, 21 years old and I am from Belgium. For my project I am using a ECU Master module to turbo a m20b25 out of a e30. The engine is totally rebuild and is already placed on a homemade test bench. The ECU is wired to the engine and I can crank it without getting started.
So far, so good ...
When I crank it I read an engine RPM (+-800) on my computer screen but I don’t get any spark. The engine uses 2 crankshaft position sensors ( VR-sensors). The first one is focused on the starter crown of the flywheel (128 teeth) and the 2nd one is focused on the place next to the starter crown (only 1 tooth).

For my ignition I want to use (temporary) the original distributor and coil. So I wired the coil like it is described in the manual, but I can't get any spark.

Someone who can help me out with this?

I will post some pictures and scope views as soon as possible.

Gr Hans

[derOJ]

Are you sure about the 128 tooth flywheel???

It should be a 60 toothed wheel with 2 missing. Tooth #1 Angle around 97 degrees

If you really have to use the starter crown, maybe that couldn't work properly, because the "tooth length" might be to short

[Chauffage]

pretty sure about it but I will remove the gearbox during the week so I can have a clear view.

thanks in advance

Hans

[derOJ]

The crown could have 128 teeth.
But the question is WHY do you have to use it?

Usually the M20 uses the sensor near the crankshaft pulley. As shown in parts catalog

http://de.bmwfans.info/parts-catalog/E3 ... ver_upper/

[Chauffage]

The crown could have 128 teeth.
But the question is WHY do you have to use it?

Usually the M20 uses the sensor near the crankshaft pulley. As shown in parts catalog

http://de.bmwfans.info/parts-catalog/E3 ... ver_upper/

So I removed the gearbox to have a better view.


One sensor is pointed to the crown wich has 137 teeth.The second sensor is pointed next to te crown and has only 1 teeth (probably TDC).


Only Tooth on the second sensor ring

Original sensors


So you recomend to you use the sensor near the cranshaft pulley ?
So I only have to use the primmary trigger right ?




How can the ECU know if the engine is in the beginof his "work" stroke or in his inlet stroke ?

Thanks in advance
Hans

[derOJ]

I am not sure what kind of project this is...or was...
but this pulley doesn't look like the m20...

it should be a 60-2 trigger wheel as shown in this picture

http://www.r3vlimited.com/board/attachm ... 1164585485


further, the OEM ECU doesn't fire or inject sequentially.
it squirts inj 1,3,5 and 2,4,6.
search the internet for wiring diagrams. you'll find a lot info

http://www.armchair.mb.ca/~dave/BMW/e30/e30_89.pdf

have a look at injection electronic.
you can see it uses two sensors. one for engine speed, one for identification.
but with 60-2 trigger and NO sequentiell injection EMU doesn't need both sensors.

[Chauffage]

Could it be possible the one on your picture is one from a type 1 ? Because mine is a type 2

When I was taking apart the wiring of the engine, the wires of the sensor in the front led to a death end at the diagnostic connector. I think it is only used for diagnostic purposes (to get RPM).

So I am convinced, the original ECU uses the 2 sensors at the gearbox. I can also find it in the electrical scheme:



[quote="derOJ"]
further, the OEM ECU doesn't fire or inject sequentially.
it squirts inj 1,3,5 and 2,4,6.

How can it fire at multiple plugs at the same time ? (distributor with single coil)
For the injection, you are right !

So when I want to use these 2 sensors on the gearbox, I guess the crown it used as "primmary trigger" and the ring next to it (1 tooth) as "secondary trigger" ?

[Jadzwin]

EMU doesn't support this pattern 137 tooth.

However you should use crank pulley from E30 with motronic 1.1 + sensor. It is very cheap (about 10 Euro for crank pulley)
Eg:


Then you will be able to run the engine in wasted spark + very precise ignition timing.

If you add cam sensor or sensor on 1st cylinder HT wire you will be able to run in full sequentional fuel and ignition.

[derOJ]

Ok. this is very new to me...but if it work that way, I don't care

first: I see a difficult, because 360 degrees cannot be evenly divided by 137 teeth.
second: The second trigger accures on EVERY single crankshaft rotation. so neither you, nor EMU can be sure where is TDC of cylinder 1....am I right?
now it's like you have two sensors reading just rpm. on reads 137 pulses every revelation, the other one reads 1 puls per revelation.

this is why there has to be another timing mark in my opinion...like the missing tooth, or a trigger which occurs only every second revelution

Maybe there is a solution I don't know yet, or I don't get the idea....


I see....Jadzwin was faster

[Chauffage]

Ok. this is very new to me...but if it work that way, I don't care

first: I see a difficult, because 360 degrees cannot be evenly divided by 137 teeth.
second: The second trigger accures on EVERY single crankshaft rotation. so neither you, nor EMU can be sure where is TDC of cylinder 1....am I right?
now it's like you have two sensors reading just rpm. on reads 137 pulses every revelation, the other one reads 1 puls per revelation.

this is why there has to be another timing mark in my opinion...like the missing tooth, or a trigger which occurs only every second revelution

Maybe there is a solution I don't know yet, or I don't get the idea....


I see....Jadzwin was faster

I think it doesn't matter how much teeth there are because the RPM is calculated on the time in between 2 consecutive tooth. The only problem with this; you can only set the number of teeth up to 60(incl. missing teeth).
When the second trigger accures there are 2 possibilities: Piston 1 is in his TDC (point of ignition) or at the end of the exhaust stroke.

When I going to use the 60-2 trigger wheel I wil get these to values in one time. RPM out of the time in between 2 teeth and tiggerpoint out af the 2 missing teeth.

Correct me if I am wrong !

Gr Hans

[Jadzwin]

360 doesn't divide without reminder by 137
The same 137 also doesn't divide by number of cylinders.

Such pattern could not be supported by EMU...

[Chauffage]

Found a 60-2 trigger wheel


Keep you guys up to date !

[Jadzwin]

You will be happy with 60-2 It is very good improvement of stock ignition system.

[PBU]

Knap werk voor een 21 jarige.

Patrick

[Chauffage]

Knap werk voor een 21 jarige.

Patrick

Bedankt Patrick ! Almost ready to fire it up !

[PBU]

Van waar ben je ?

[Chauffage]

Genk, bij Hasselt. Jij ?

[PBU]

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