Discussion in 'Engine and Drivetrain' started by Italia-Linea, Oct 16, 2013.
I think Amit and Wolf team is working on option like this but not exactly like this.
Since the temp needle is used to indicate the maps how would the actual high temp be identified? For e.g. if the radiator fan stops working for some reason and the engine gets hot.
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There seems to be a lot of confusion and misunderstanding going on. Let me try and clear the air a bit.
The CAN (Closed Area Network), works by broadcasting messages. You turn headlights on, that is a message. You press a button on the steering mounted controls, that is another message. You press power window button, that is one more message.
There are 3 CAN networks in the FIAT - CAN A, B & C. The remap code is written into the Engine Control Unit, which is on CAN A, the network meant for critical functions. Although all messages are broadcast, the message has a identification of who it is meant for and only that module takes action. All other modules discard the message. This means, when you press the Volume Up button, a command is broadcast on all the networks, but only the Radio module will acknowledge and take any action. Similarly, when you press the gas pedal, a command is sent on the network. Only the ECU will acknowledge that message and activate the Motorized Throttle Body to open it. All other modules will discard the message.
Thus, it is imperative that whatever action performed to switch maps, must be acknowledged and understood by the ECU. It is also imperative, that the action must be unusual and not something that one does in the course of normal driving. Ergo, comes the "pressing the gas pedal without cranking the engine" sequence. Nobody in their right mind would do that, right? So, to switch maps, one presses the gas pedal without cranking the engine. Performing any action like pressing some button on the console or ICE is not something the ECU understands.
Now comes the question, how does one know which map is active? Some sort of indication is needed to help the driver understand. So, what is chosen is to send a signal from the ECU, that the Body Control Module understands and converts to a visible action on the console. Thus the temp gauge needle moving to different positions. It is as simple as saying the engine is now at xx degrees, please indicate the same.
Point to note here is - all of this happens, without the engine running. Pressing the gas pedal, when the engine is running is an expected action, if one wants to get the car going, isn't it? Also, the temp gauge assumes it's normal action when the engine is running, of course.
Hope this helped.
Very well described
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Once a map is selected, would it be the same every time until one chooses to change it?
Would the temp needle indicate the current map every time when the key is turned to MAR?
Yes Kiran, Once selected the Map stays on till its changed by selecting a different map.
The Temp needle will indicate the selected map when the key is in MAR and temp needle will show actual temp when the ignition/engine is turned on.
Cant the change of MAPS been done only in First gear ,that too while in running ?
Yes you can change the map on the move but for that you need to cross 4800rpm and maps will be switched to top map and no other map and it will remain in top map only. Then you can not change the map from 4 to say 3 or 2. For that you need to switch off the engine and change the map.
Thanks Raj for the information. Long time. How is your remapped 90HP now? Please write a detailed review with your observations.
if i want to change the maps based upon the gear slot and engine rpm ? this cant be done ? when engine rpm crosses 4800 rpm it can switch to other map then why not only in first gear and specific rpm's.
Finally we are on same command network of ECU as rajan explained ?
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