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The BMW Range
3 Series
E90, E91, E92, E93
Type of modification on your E90
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<blockquote data-quote="Bimmer910" data-source="post: 221557" data-attributes="member: 6280"><p>I dont profess to know too much about ECUs, so i did a little reading. Heres what i got off the net :</p><p></p><p>ECU-remapping generally is reprogramming the “brain“ of the car for better performance.</p><p></p><p>As car manufacturers have to consider many different conditions and factors like temperature, air pressure, fuel quality (not every country has high octane fuel), the programming of the ecu software often is a compromise between performance and street legality in all countires..</p><p>Also the software is made to make the car run even under “unreal” conditions, that normally will never occur.</p><p></p><p>These factors still leave the possibility to optimize the factory setup. This is where ecu-remapping comes in. </p><p></p><p>For doing this improvement, the ECU of your car need to be reprogrammed / modified.</p><p></p><p><strong>Petrol (Naturally Aspirated):</strong>Remapping a petrol engine ECU will produce 10 - 15% BHP depending on exact specification, the engine will also be more responsive on initial acceleration and produce more torque (up to 20%) through out the entire rev range, giving more response on lighter throttle.</p><p></p><p><strong>Petrol (Turbo):</strong>Remapping a petrol turbo engine ECU can produce 20 - 30% BHP.</p><p></p><p>There are different ways to do this:</p><p><strong>- OBD-programming</strong></p><p>Many new cars offer the possibility to read and write the complete ECU data via the diagnosis connector of the car. The advantage of this method is that the ECU can stay inside the car and needs not to be opened. </p><p></p><p><strong>- direct programming of the chip (eprom) in the ECU</strong></p><p>The eprom must be desoldered from the circuit board. Then it will be erased and reprogrammed with the modified and optimized data. For some older cars, the eprom can not be erased and has to be replaced with a new (eprom programming is done for example with the BeeProg)</p><p></p><p><strong>- serial programming</strong>The ECU must be removed from the car and is programmed by special spring contacts without soldering on the circuit board. This method is used for example if a car has no connection from the OBD connector to the ECU or for very new ECU versions. </p><p></p><p>Cheers</p></blockquote><p></p>
[QUOTE="Bimmer910, post: 221557, member: 6280"] I dont profess to know too much about ECUs, so i did a little reading. Heres what i got off the net : ECU-remapping generally is reprogramming the “brain“ of the car for better performance. As car manufacturers have to consider many different conditions and factors like temperature, air pressure, fuel quality (not every country has high octane fuel), the programming of the ecu software often is a compromise between performance and street legality in all countires.. Also the software is made to make the car run even under “unreal” conditions, that normally will never occur. These factors still leave the possibility to optimize the factory setup. This is where ecu-remapping comes in. For doing this improvement, the ECU of your car need to be reprogrammed / modified. [B]Petrol (Naturally Aspirated):[/B]Remapping a petrol engine ECU will produce 10 - 15% BHP depending on exact specification, the engine will also be more responsive on initial acceleration and produce more torque (up to 20%) through out the entire rev range, giving more response on lighter throttle. [B]Petrol (Turbo):[/B]Remapping a petrol turbo engine ECU can produce 20 - 30% BHP. There are different ways to do this: [B]- OBD-programming[/B] Many new cars offer the possibility to read and write the complete ECU data via the diagnosis connector of the car. The advantage of this method is that the ECU can stay inside the car and needs not to be opened. [B]- direct programming of the chip (eprom) in the ECU[/B] The eprom must be desoldered from the circuit board. Then it will be erased and reprogrammed with the modified and optimized data. For some older cars, the eprom can not be erased and has to be replaced with a new (eprom programming is done for example with the BeeProg) [B]- serial programming[/B]The ECU must be removed from the car and is programmed by special spring contacts without soldering on the circuit board. This method is used for example if a car has no connection from the OBD connector to the ECU or for very new ECU versions. Cheers [/QUOTE]
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Type of modification on your E90
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