M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine management => Topic started by: Chris_XIII on September 07, 2008, 04:45:45 AM
-
Hi, I'm a new member so I don't knew If there excist this topoc... I have a Bmw e30 with m42 engine but the 2 generation. I'm going to put a turbocharger on it
and I don't knew if stock ecu can handle it (ofcourse using biger injectors and remaping stock ecu). Is this possible? Do you knew something about it??:confused:
-
You have a whole lot of reading to do. If you have to ask questions like this you are in no position to safely turbo your m42. There is plenty of info available in the very same section that you posted this in, read please.
-
those dayes I've read meny topics but no one tells if stock ecu is remapable. all are using aftermarket ecu. Here in Greece I've seen meny 318is turbo using cosworth electrics and handle meny horspower but some days now I hear that stock m42 ecu can be remapable and it is very good on this. the only thing I want to learn is if it is true. I would appreciate if someone could help me and not telling me "If you have to ask questions like this... ".
-
You can have a custom "piggy back" chip burned... but this is only for low boost situations. Maybe 7psi. And even then you will have better results with full aftermarket fuel and spark management.
-
now I undersand why they change ecu.. do you knew something about someone used it and it is working fine? the problem is that for now I'm out of money...
-
the stock ecu can be remapped for turbo use, but you need to find a shop with the abilities to do so. these days it might be easier to just go with a piggy back, or a standalone.
-
It's not any rocketsciense to remap stock ECU for turbo use. Most difficult tasks are how to handle possible knock & overboost situations. For that there are "boxes" available.Link Electromotives "Knock Link" is one of them.
Most '80's-90's factory turbo Bosch Motronic systems has a paraller box to handle knock & Overboost, for example Porsche had that kind of system. I know few engines which have Porsche 944 Turbo's ECU installed, i suppsoe it is the same kind of installation if you use Sierra Cosworth's Magneti Marelli Ecu as you have desrciped.
-
I'm not sure but I think m42 2 generation has knock sensor, isn't it?? Overboost is not a problem because the engine will work with boost controller and will work with constant boost. My problem is if stock ecu can handle RC 750 cc / min fuel injectors and programming it to have the right mix of air and fuel at deferent RPM...
-
My problem is if stock ecu can handle RC 750 cc / min fuel injectors and programming it to have the right mix of air and fuel at deferent RPM...
Your ECU does not know what injectors you are using, it's the binary code inside the ECU. Just find a cabale programmer who understands Motronic, or of course you can use some piggy pack boxes (like Perfect Powers SMT6) to alter fuel parameters for bigger injectors.
-
Is this Perfect Powers SMT6 is really so good?Most times engines don't break from pistons, rods ech but from bad ecu programming... Programming is the final and most important part of this project..
-
I'm not sure but I think m42 2 generation has knock sensor, isn't it?? Overboost is not a problem because the engine will work with boost controller and will work with constant boost. My problem is if stock ecu can handle RC 750 cc / min fuel injectors and programming it to have the right mix of air and fuel at deferent RPM...
correct, 2nd gen m42's have knock sensors.
-
guys, what is writting on stock ecu on it? product make?
-
guys, what is writting on stock ecu on it? product make?
ok, if you want any one on this board to take the time to answer your question, at least take the time to make it somewhat understandable.
Seriously.
-
ok, if you want any one on this board to take the time to answer your question, at least take the time to make it somewhat understandable.
Seriously.
Motronic or DME??
-
Does it make any difference? It's Bosch Motronic systems DME box :)
I can check out later to day, have one extra box somewhere. Most likely there is written Motronic if i can remember correctly, but i suppose you need the Bosch part number ?
hey Mike,
Chris is from Creece, so give him a chance, after all most likely he writes better Greek than me and you ;)
-
Does it make any difference? It's Bosch Motronic systems DME box :)
I can check out later to day, have one extra box somewhere. Most likely there is written Motronic if i can remember correctly, but i suppose you need the Bosch part number ?
hey Mike,
Chris is from Creece, so give him a chance, after all most likely he writes better Greek than me and you ;)
yes I knew, many things I write may have not the correct form... Ose30 is right ;). I didn't knew that DME was Bosch Motronic systems. I thought that they had difference..
Soon I will present you my project
-
Here's my extra box:
(http://i5.photobucket.com/albums/y170/olli951/ISboxi.jpg)
yes I knew, many things I write may have not the correct form
I would rather write in Finnish :)
-
I have the other one writting DME
-
750cc's are way big for the low boost your talking about, 450's are plenty for up to the 12-14psi range.
-
I want 300-380hp so car will work over 14psi
-
I have the other one writting DME
Yes it's just a normal Motronic. It is also called as Digital Motoren Elektronik = DME
-
Are the RC 750 cc injectors high impedance? If not then you will have to modify the harness and add one extra resistor per injector to make them high impedance otherwise you cannot use them with the Motronic box.
I'd recommend a stand alone ECU 24/7, if you go with Megasquirt it doesn't have to be that expensive.
-
Most Motronic systems use only two wires / 4 injectors (at Motronic DME box), so only two resistors are needed.
-
Are the RC 750 cc injectors high impedance
Do you mean if RC injectors have hight resistance?? if you mean this RC prodact injectors with low resistance 2.5 / 3 OHMS and same with hight resistance Approx. 12 - 16 OHMS. This is a part of the project that I hadn't think... thanks;)
-
Would you have to do anything if you ran like 5 to 6 psi? I don't think DASC did? May be wrong though
-
Would you have to do anything if you ran like 5 to 6 psi? I don't think DASC did? May be wrong though
DASC uses a rising rate fuel pressure regulator, so it raise the fuel pressure of stock fuel rail with stock injectors to a value near 90-100psi at max boost, from the 43,5 psi of stock FMU.
There isn't a way to add more air to the engine without adding fuel with it. If you don't do this you'll blow the engine, as it will be a lot lean, detonation will occur and bye bye to your pistons and the other parts.... ;)
-
I'd recommend a stand alone ECU 24/7, if you go with Megasquirt it doesn't have to be that expensive.
Can someone tell me some more things about this Megasquirt ecu? is it so good?
Megasquirt or Perfectpower is better?
-
Depends what you are looking for. Perfectpowers SMT6/SMT7 are piggyback type of devices which just alters the signals delivered to Motronic.
Megasquirt is like Linux, it's an open system which can be developed/changed by it's endusers. If you like to have another hobby, get Megasquirt, it's never just plug 'n' play to use Megasquirt, Vems or similar standalone ECU's. It will take some time to get it work properly, of course standalone systems will give you more possibilities to tune up your car, but in the most cases piggy back devices will do the job.
-
of course standalone systems will give you more possibilities to tune up your car, but in the most cases piggy back devices will do the job.
yes, this is the reason why I'm thinking now a standalone ecu...