Live mapping 850CSi

[Fatandre]

Since we are going that way, does anyone know if standard 850 ECU can be programed to the CSI one to the EML button could be used?
I know the DMEs can

[yamoda]

If you let me take a look at the code I could tell you exactly what they did to it :-)

I'd be happy with that, especially as I have a set of the later, slightly bigger injectors I'd like to fit. pm me and we'll sort something out.

[Fatandre]

I'd be happy with that, especially as I have a set of the later, slightly bigger injectors I'd like to fit. pm me and we'll sort something out.

What do you mean by later?

[yamoda]

What do you mean by later?

Bosch Gen 3, multi hole injectors.

[Omega man 1969]

Update: I have been experimenting with the EML using my emulator, I have found a few maps that relate to Komfort mode. The plan is to find out how the pedal/ throttle relationship works.






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[Fatandre]

What cam and lens are you using. Love how your pics are so sharp

[Omega man 1969]

Just an old nokia phone :-)



Seriously though I'm not sure, it's belongs to my old mate the Earl of Wanstrow.

[Omega man 1969]

More progress today.

I created an EML XDF for Tunerpro and started to define the maps one by one. As each map was created I used data hit tracing in tuner pro to look for activity from pressing the throttle pedal. I found 3 tables for pedal response....1 for limp home, 1 for Komfort and 1 for sport mode. They are RPM based x Pedal movement.

On the CSi it appears you can achieve full throttle opening in sport mode at any RPM..... in Komfort you can't open the throttle fully until 4000 ish RPM( yet to convert the hex into RPM values).

[4drian]

On the CSi it appears you can achieve full throttle opening in sport mode at any RPM..... in Komfort you can't open the throttle fully until 4000 ish RPM( yet to convert the hex into RPM values).

I guess this is why Wokkes EML chip makes the car feel so much more responsive!

Quick question: Does anyone know what triggers which map is loaded? Iirc US/EU/J-spec maps are all in the DMEs, but what chooses which one is loaded?

[Omega man 1969]

I guess this is why Wokkes EML chip makes the car feel so much more responsive!

Quick question: Does anyone know what triggers which map is loaded? Iirc US/EU/J-spec maps are all in the DMEs, but what chooses which one is loaded?

Are you talking EML pedal map or DME fuel/ignition map? on the CSi its the EML map is selected by sport/Komfort switch by the gearchange. On the Auto I would imagine the Sport switch also changes which map is used. Its very easy to change the values to make the pedal act as if its connected by a cable.....just make all columns the same value so that it acts the same regardless of RPM.

The DME doesn't have selectable maps......it uses the ones it's been setup for (fuel rating/country)

[ArnoNym]

Somewhere I read – I can’t remember where it was – that the maximum opening angel of the throttle was also road speed related.

[Omega man 1969]

Somewhere I read – I can’t remember where it was – that the maximum opening angel of the throttle was also road speed related.

They don't appear to be road speed related. I have about 30 different maps defined now but only 9 or so seem likely to be pedal related.........I will edit the maps tomorrow........I think the safest way to test that theory will be to replace the existing high opening values with Zero's, then see if the car stalls at the same throttle angle/rpm regardless of road speed.

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Here is a shot of the Komfort and Sport pedal map. You can see clearly the different rates.

komfort mode pedal map.jpgsport mode pedal map.jpg

I have also found what I think is the VMAX speed limiter, Its a 2byte value which converts to 252kmh. I will try dropping this to around 40Kmh and see if the cars hits that limit.

I didn't have time to try a new map on the car today, should have time tomorrow. I have altered the Sport mode map to act more like a cable in its response.....like this:

CSi modified sport map.jpg

[Timm]

Fascinating! I bet the Wokke EML map is a bit steeper at the bottom!

[Omega man 1969]

Fascinating! I bet the Wokke EML map is a bit steeper at the bottom!

steeper everywhere :-)

[4drian]

The DME doesn't have selectable maps......it uses the ones it's been setup for (fuel rating/country)

I know i shouldn't question you, but are you sure? Egil had a problem where his car read the wrong (US-spec) map iirc, as this was the market the supercharger kit (and their chips) were made for. Ran into issues when the car read a stock EU-spec map which had not been altered.

[Omega man 1969]

I know i shouldn't question you, but are you sure? Egil had a problem where his car read the wrong (US-spec) map iirc, as this was the market the supercharger kit (and their chips) were made for. Ran into issues when the car read a stock EU-spec map which had not been altered.

Ha it's ok. When I said the maps aren't selectable in the DME I meant they aren't selectable by the driver. You can edit an area of the Eprom called the Variant switch, this will allow you to select country/leaded/unleaded/manual or auto gearbox/purge valve on or off ETC. So yes you can select a different set of fuel and ignition tables based but you would need to edit the code of the eprom then correct the checksum and install it back in the car.

[8Tech]

So the pedal map will actually make the car "feel" faster and more responsive, but all you are doing is altering the ratio between foot input and throttle position output.

Will this not make it difficult to control throttle opening at part throttle?

My 4.8iS X5 has this mod from a remap and it feels great when driving hard but is a nightmare at all other times and is dangerous for someone driving the car and not expecting it.

8Tech.

[Omega man 1969]

So the pedal map will actually make the car "feel" faster and more responsive, but all you are doing is altering the ratio between foot input and throttle position output.

Will this not make it difficult to control throttle opening at part throttle?

My 4.8iS X5 has this mod from a remap and it feels great when driving hard but is a nightmare at all other times and is dangerous for someone driving the car and not expecting it.

8Tech.

I could make it more sensitive low down but decided agaisnt that for that very reason, Komfort mode is always an option for inexperienced drivers .

[Timm]

Just for interest - the V8's throttle pedal produces a similar throttle valve curve, but achieved with metal linkages!

[Omega man 1969]

A kind forum member let me have a copy of their Alpina EML file to compare. Here is the Alpina sport mode map.

alpina sport map.jpg

[Timm]

....So at 55% throttle-pedal travel, the Alpina fully opens the throttle once the revs gets to 5000 RPM - I bet that feels fast!

[Omega man 1969]

Indeed Tim, I uploaded the Alpina file into my EML and it runs fine and feels more responsive. I also tried my modified map and the EML light came on right away.....Checksum I thought, so I edited the blank area of the file so that the calculated sum was the same as the original. The car started and ran fine, throttle response was noticeably sharper but after 3 mins the EML light came back on. I'm guessing the numbers in the map are compared to some other values in the file so I need to look at the Alpina file in more detail......promising though.

....So at 55% throttle-pedal travel, the Alpina fully opens the throttle once the revs gets to 5000 RPM - I bet that feels fast!

[Fatandre]

Its funny how this thread has given me insight into many things on the e31.
Thank you so much for that Omega

[Omega man 1969]

Its funny how this thread has given me insight into many things on the e31.
Thank you so much for that Omega

Glad it's of some interest :-)

[ArnoNym]

Glad it's of some interest :-)

No question, it is! The access counter of your thread shows > 11000 today. Both thumbs up and thank you, for what you are doing and sharing.

Best regards
Joachim