Petter Solberg WRT

MOTORSPORT NEWS UK published weekly motorsport newspaper

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Originally Posted by MJW

MOTORSPORT NEWS UK published weekly motorsport newspaper

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OK!Thanks a lot!! ;)

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Originally Posted by Viking

Petter said on radio today that he has full control on everything except the engine, Citroen has control over the engine.

I think I will let OldF (or someone else much better than me) explain about ecu mapping ;)

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Hmm, maybe you now more about mapping than I do but I try although I’m not an expert and don’t have any practical experience of ECUs but I do know how computers works.

Basically an ECU is a microcomputer consisting of a CPU or a micro controller, memory, I/O (input / output) chips and on the input side A/D (analogy/digital) converters. Here is a pic of an ECUs inputs and outputs for the amount of fuel.

http://i267.photobucket.com/albums/ii284/OkdF/ECU.jpg
When the software of the ECU interprets the values of the inputs, the software of the ECU converts the input signals to a memory address. Then it reads the value from that memory address and put it out as a pulse width to the fuel injectors. The ignition is adjusted earlier or later in the same manner.

An ECU can have several different maps and I think you have seen in some coverage when the drivers said that the engine turned on the safety mode for some reason. So a WRC car has at least two different maps, one for stages and one for safety mode or road sections. In fact I once read an article in which the writer said that there is a basic map and the tuning map consists of multipliers of that map (the basic maps values are multiplied with multipliers >1 or <1). Changing the values in the memory is mapping and to do that you have to have software in a PC that is connected to the ECU and I think the WRC teams wont give that software to anyone. Basically it’s possible to replace the original ECU with an aftermarket ECU like Motec, and start the mapping from scratch, but I don’t if it’s it prevented somehow.

Fuel map:

http://i267.photobucket.com/albums/i...dF/fuelmap.jpg

Ignition map:

http://i267.photobucket.com/albums/i...kdF/ignmap.jpg

Every square in the horizontal plane is one memory location / address. ;)

Old F, I am impressed !

Very easy to understand explanation !

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Originally Posted by Sulland

Old F, I am impressed !

Very easy to understand explanation !

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Thanks Sulland

and this is for a NA engine. Turbo engines will have additional inputs for boost pressure, air temps on different places.

Output for regulating boost pressure and probably air/oxygen injection in fuel system or some other tricks

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Originally Posted by Gard

and this is for a NA engine. Turbo engines will have additional inputs for boost pressure, air temps on different places.

Output for regulating boost pressure and probably air/oxygen injection in fuel system or some other tricks

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and antilag

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Originally Posted by Gard

and this is for a NA engine. Turbo engines will have additional inputs for boost pressure, air temps on different places.

Output for regulating boost pressure and probably air/oxygen injection in fuel system or some other tricks

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The pic was only for the fuel injectors. Have a look here on page 7.

http://www.ralliart.co.jp/GRN/homolo...ancerEvo10.pdf

It cannot be compared directly with a WRC cars input / outputs but gives a view that there are lot more I/O compared to my pic.

Looks like Peter has got is C4
http://redirectingat.com/?id=42X123&...g-c4-portugal/

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Originally Posted by big_sw2000

Looks like Peter has got is C4
http://redirectingat.com/?id=42X123&...g-c4-portugal/

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In a question of wrc.com he refused that....