RomRaider

Would really enjoy fast rpm drops during spirited shifting situations.

Digging through RR the only things im finding would be to lower the timing advance at the lowest MAF cell (50 i think it is) for the entire rpm range in the RON files under the ignition category.
Or under the deceleration category, retarding the timing more in the one section about TPS with A/C off (forget exactly what its called, no access to my laptop atm).

Any ideas? Am I way off?

This! Edit the column for hottest temp so that the retard is -10 to -15 degrees and the rev hang is pretty much gone. Originally there is even positive values to acheive the rev hang. Apparently this is done because it will make gear chamges easier if you drive like a granny

Second thing I would recommend is to raise the min temp for antijerk to max value (143 degrees C or something). This makes the engine respond much quicker to fast thorttle movements. Which makes fast gear ghanges much more pleasing.

Awesome thank you very much!

This is how I prefer to do it at the moment, even though the deceleration map method works too.
It seems that you get a very short and nice exhaust crackle on decel when editing the main ignition maps, lowest Load column. I typically do 18-20 degrees ignition advance for sane values.

Will either of these methods make rpm drop immediately when clutch is in and throttle pedal is up?

Some guys use even negative -20 on the first column...this on renault so bmw probably same...

Currently i have it as pazi88 mentioned, it definitely made revhang shorter, but it is still there slightly. Not a big deal but hey if it can be how i want it, let off the gas and push clutch in at the same time and rpm immediately starts falling, would be superb.

Did negative 16.5 on the first (33) and second (50) MAF load column on both RON 91 and 98 tables from 1000 to 6500 rpm. Rev hang seems to be completely eliminated with that adjustment, but a new issue has occurred...maybe its a side effect? In neutral with the clutch out the car seems to be slowly dipping at idle, goes between 600ish to 720rpms. As soon as I push the clutch in it goes right to 720 and sits there.

Out of curiosity, anyone know where to look in the bin for what table(s) are dependent of the clutch switch?

There is one idle advance table at least for clutch switch but it's not defined in current RRdefinitions. But you could revert the changes in ignition map close to idle rpm to see if it has effect.

I reverted back and this weird car still does it but the rpm range goes back and forth from 720 down to 680ish instead of the previous 120 rpm bounce.
Maybe something is up with the ICV.

What is the german damos acronym for the clutch switch?

In the old old days of MS42, people discovered that if they cut a wire on the clutch switch, all their rev hang went away.

Are you hinting that cutting the clutch switch wire will eliminate revhang

The map name is kf_zw_kup_swi_ll__tkw
So kup_swi is clutch switch

And if I remember correctly cutting clutch switch wires will cause dtc. Or at least non working cruise.

Kind of.. but I don't approve of the method. But if the maps are known, it's another piece of the puzzle.



https://www.bimmerforums.com/forum/show ... -on-M52TUs photobucket has all the pictures now, unfortunately.

Oh ya, that was easier than I made it seem in my head. Clutch = kupplung ...

Thank you!