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      04-25-2023, 03:49 PM   #1
etropic
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Coding different variables for Comfort/Sport/Sport+

Is it possible to code and change the values that are used in these different drive modes?

Such as using the steering values from Sport in Comfort? etc.

Using Bimmercode / Protool or any app necessary.

Goal is to get sport steering in comfort mode.

thanks!

Last edited by etropic; 04-25-2023 at 05:10 PM..
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      04-27-2023, 04:10 AM   #2
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Quote:
Originally Posted by etropic View Post
Is it possible to code and change the values that are used in these different drive modes?

Such as using the steering values from Sport in Comfort? etc.

Using Bimmercode / Protool or any app necessary.

Goal is to get sport steering in comfort mode.

thanks!
Yes you can but the tables that define it are obtuse and not publicly documented.

Protool can do it.

Suggest you go across to *********** where guys with brains the size of planets and tenacity hang out ..

Whynot just run it in sports mode..or improve the feel of the steering mechanically ?
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      05-02-2023, 02:32 PM   #3
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assuming your link was spool ? (it got redacted).

The sport mode feel is good.

The issue is turning DSC off completely engages comfort mode. Since i'm in Manual it doesnt really matter about the shift points, but it does make the steering instantly lighter than I would prefer it.
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      05-02-2023, 05:27 PM   #4
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I just lived with it ..I’m not much of a hero so I’m glad BMW is there to save me when I screw up..
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      05-03-2023, 12:11 PM   #5
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ya this is purely for tracking it. Trying to get it dialed in around my n00b capabilities. But I am struggling with DSC on having it cut at all the wrong times. So much better with it off.
Street wise, I always leave it on !
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      05-03-2023, 01:23 PM   #6
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Originally Posted by etropic View Post
ya this is purely for tracking it. Trying to get it dialed in around my n00b capabilities. But I am struggling with DSC on having it cut at all the wrong times. So much better with it off.
Street wise, I always leave it on !
Maybe put a LSD in and just accept ‘relaxed’ stability in Sports+ mode..

With a Quaife LSD and e-diff coded off and 400 BHP / 650nm seems ok with 275/30 sports Conti 7s
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      05-03-2023, 05:27 PM   #7
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Quote:
Originally Posted by B21 View Post
Maybe put a LSD in and just accept ‘relaxed’ stability in Sports+ mode..

With a Quaife LSD and e-diff coded off and 400 BHP / 650nm seems ok with 275/30 sports Conti 7s
I think that's the route for sure. Just got to prioritize the budget :P
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      05-04-2023, 01:51 PM   #8
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I think that's the route for sure. Just got to prioritize the budget :P
There are cheaper torque sensing diffs than Quaife..

If you are primarily focussed on track use then a plated diff may be appropriate..
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      09-06-2023, 04:45 PM   #9
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Quote:
Originally Posted by etropic View Post
Is it possible to code and change the values that are used in these different drive modes?

Such as using the steering values from Sport in Comfort? etc.

Using Bimmercode / Protool or any app necessary.

Goal is to get sport steering in comfort mode.

thanks!
I would love to know how to adjust the values myself, I just sold my other z435i and now have the z435is and when changing to sport in this car the steering isn’t getting stiff, I put live data in protocols to check torque settings on the steering wheel on this car and the last while i still had it and while turning in comfort mode it would go to 3 or -3, if I put it in sport mode it would go to 4 or - 4 depending on which way you turn, clockwise vs anti clockwise. The 35is stays at 3 or -3. So something isn’t happy, no errors though, checked wires on the steering rack and all seem to be good.

In terms of what the OP is asking, I think it’s a perfectly valid ask, The steering is looser than what allot of people like in comfort mode and would be nice if we could change a few values in the coding to make it a bit stiffer, I would need to figure out why my steering isn’t stiffening up in the first place to be able to resolve the coding side of it.
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      09-06-2023, 05:05 PM   #10
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Quote:
Originally Posted by Sachak View Post
I would love to know how to adjust the values myself, I just sold my other z435i and now have the z435is and when changing to sport in this car the steering isn’t getting stiff, I put live data in protocols to check torque settings on the steering wheel on this car and the last while i still had it and while turning in comfort mode it would go to 3 or -3, if I put it in sport mode it would go to 4 or - 4 depending on which way you turn, clockwise vs anti clockwise. The 35is stays at 3 or -3. So something isn’t happy, no errors though, checked wires on the steering rack and all seem to be good.

In terms of what the OP is asking, I think it’s a perfectly valid ask, The steering is looser than what allot of people like in comfort mode and would be nice if we could change a few values in the coding to make it a bit stiffer, I would need to figure out why my steering isn’t stiffening up in the first place to be able to resolve the coding side of it.

The more I looked into it the more obtuse and difficult it got..as discussed there are many variables each with it’s set of possible values..you can edit them in Protool (or I guess ISTA) and /or load complete s/w versions..

I have swapped the performance brake option in for example as that was a bmw option although never deployed on the

On s p o o l s t r e e t There’s been a very very long discussion on coding DSC variables and lots of reverse engineering..the point of realisation being that without knowing the whole system it’s very very difficult to interpolate results…

Of course a good analogue approach works..I used M3 steering linkages plus monoball upgrades with Meyle HD tie rod ends and camber plates with revised steering geometry to get the feel and tightness I wanted..

https://www.bimmerworld.com/BimmerWo...93-M3-E82.html
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Change history here… https://www.dropbox.com/s/8h1vabklgz...0List.pdf?dl=0
Build thread here… https://z4-forum.com/forum/viewtopic.php?t=131886
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      09-07-2023, 06:47 PM   #11
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Quote:
Originally Posted by B21 View Post
The more I looked into it the more obtuse and difficult it got..as discussed there are many variables each with it’s set of possible values..you can edit them in Protool (or I guess ISTA) and /or load complete s/w versions..

I have swapped the performance brake option in for example as that was a bmw option although never deployed on the

On s p o o l s t r e e t There’s been a very very long discussion on coding DSC variables and lots of reverse engineering..the point of realisation being that without knowing the whole system it’s very very difficult to interpolate results…

Of course a good analogue approach works..I used M3 steering linkages plus monoball upgrades with Meyle HD tie rod ends and camber plates with revised steering geometry to get the feel and tightness I wanted..

https://www.bimmerworld.com/BimmerWo...93-M3-E82.html
This is very interesting and definitely something I would like to try. I put coil overs in my 35i and took them out just before selling the car so I may just put them in the 35is. I like the overall feel of the 35is suspension compared to the 35i by a long shot but I am missing that very direct feel I had with the coil overs and the stability I got at higher speeds, the car just felt allot more planted. So I definitely would love to try adding the same setup you have with regards to tie rods etc.

But I still do want to figure out why my steering isn’t tightening up in sport and I don’t think the suspension is stiffening up either. Could be a fuse as the coding all looks correct and I am not getting any errors. The fact that I am getting a torque reading from the steering wheel in proTools means it is at least functional.
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      09-08-2023, 04:07 AM   #12
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Quote:
Originally Posted by Sachak View Post
This is very interesting and definitely something I would like to try. I put coil overs in my 35i and took them out just before selling the car so I may just put them in the 35is. I like the overall feel of the 35is suspension compared to the 35i by a long shot but I am missing that very direct feel I had with the coil overs and the stability I got at higher speeds, the car just felt allot more planted. So I definitely would love to try adding the same setup you have with regards to tie rods etc.

But I still do want to figure out why my steering isn’t tightening up in sport and I don’t think the suspension is stiffening up either. Could be a fuse as the coding all looks correct and I am not getting any errors. The fact that I am getting a torque reading from the steering wheel in proTools means it is at least functional.

I increased castor by about 1.5 degrees , front camber by about 1 degree and reduced rear camber by 1 degree..kept toe in front and rear spot on stock..

If the fuse is blown you would get an idrive error and a diagnostic would show ECU offline..
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      09-08-2023, 04:35 AM   #13
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Quote:
Originally Posted by B21 View Post
I increased castor by about 1.5 degrees , front camber by about 1 degree and reduced rear camber by 1 degree..kept toe in front and rear spot on stock..

If the fuse is blown you would get an idrive error and a diagnostic would show ECU offline..
Interesting, I need to have a look and see where I can get all the parts listed that you changed here in SA.

With regards to what is going on with my car then I don't have a clue, there are no errors, my friend has a 2011 Z4 35is and his steering also doesn't seem to stiffen up in sport as well as his shocks too and we have checked on both cars that they are the EDC shocks, they all plugged in, checked in the ECU box to make sure it's all connected and that the previous owner never coded them out which is exactly what I did on my previous car when I fitted coilovers. I need to figure this out.

I also went under the car to have a look at the steering rack itself to make sure there was no unplugged or loos plugs, everything is perfect and clean. So this is interesting.
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      09-08-2023, 05:35 AM   #14
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If there was a fault in the rack you would notice big issues in comfort mode..

I do know that the steering variables were changed specifically for the early 35i/35is compared to others..maybe as the car is so front end heavy they didn’t tweak it as hard for sport mode..

Could be the shocks are shot..mine were but I think they still stiffened up..good hunting
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      10-10-2023, 12:26 AM   #15
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Quote:
Originally Posted by Sachak View Post
Interesting, I need to have a look and see where I can get all the parts listed that you changed here in SA.

With regards to what is going on with my car then I don't have a clue, there are no errors, my friend has a 2011 Z4 35is and his steering also doesn't seem to stiffen up in sport as well as his shocks too and we have checked on both cars that they are the EDC shocks, they all plugged in, checked in the ECU box to make sure it's all connected and that the previous owner never coded them out which is exactly what I did on my previous car when I fitted coilovers. I need to figure this out.

I also went under the car to have a look at the steering rack itself to make sure there was no unplugged or loos plugs, everything is perfect and clean. So this is interesting.
Did you ever code back in the EDC when you removed the aftermarket coil overs and reverted to stock when you sold the car? If so can you share the instructions on how to do so? I am looking to do the same
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      10-11-2023, 05:57 AM   #16
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You need to plug the EDC computer back in ..add the electronic damping option back into VO and CAS and it should be fine…you’ll need a decent coding tool like ISTA or Protool to do that…IMHO…as I’ve only removed them..but it should be the reverse process..
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