Question Regarding ZCP DSC, VDC, etc. on Base Car

[evolmotorsprt]

I've read through the Comp Pack coding thread and have coded the following:

Module | Parameter | non-ZCP | ZCP
VDC | Fahrzeugtyp | F80 = 0F | F80_Comp = 27
VDC | M_Competition / High | 00 | 01
ICM | IcmKod_I_Karosserie | 0C | 1A
DSC | C_Variante_Fahrzeug_e | 00 | 03
DSC | DSC_CODIERDATEN_RDCI_18_18_2 | nicht_aktiv = 00 | aktiv = 01

My question is: does coding the above change the calibration of the active M differential? From my experience the car now feels like rear hooks up much better, and doesn't step out as easily. It also feels like the dampers now allow the car to squat under hard acceleration. I couldn't find this specific answer in the thread.

Thanks!

[jim996]

http://f80.bimmerpost.com/forums/sho....php?t=1335887

[evolmotorsprt]

Originally Posted by jim996

http://f80.bimmerpost.com/forums/sho....php?t=1335887

Thanks, it was a good read. So it looks like you're feeling the same thing I am wrt to the changes. I did the same things as you regarding springs and coding. I'm considering doing the zcp sways as well.

[elmerzasty]

Same experience here - a noticable improvement in traction.

[jim996]

Originally Posted by evolmotorsprt

Thanks, it was a good read. So it looks like you're feeling the same thing I am wrt to the changes. I did the same things as you regarding springs and coding. I'm considering doing the zcp sways as well.

I've found it difficult to really assess my car yet as it's so cold here in the UK that the tyres never really get warm even on a dry day.......I've heard the sways are a big job to change.

I'm going to try it for a while but I might still go with coilovers this year.

[packetpilot]

To be clear, unless you're coding/converting GHAS, you're not modifying the diff.

source

[packetpilot]

Originally Posted by packetpilot

To be clear, unless you're coding/converting GHAS, you're not modifying the diff.

source

That said, if you're modifying DSC, perhaps you may be modifying the way the diff is commanded..? I'm still trying to sort how 'logically adjacent' systems interact with one another... so I'm spitballing.

[elmerzasty]

The DSC controls the diff.

[packetpilot]

Originally Posted by elmerzasty

The DSC controls the diff.

This is unclear to me. Do you mean to say that "The GHAS [diff] can be commanded by the DSC"? Because to me it sounds like you're saying the GHAS ECU (the ECU *on* the diff) does not control the diff, but a physically separate ECU does.

I truly don't mean to be pedantic.

That said, if the DSC is commanding the GHAS (and my read on your statement is correct), and the DSC is in ZCP mode, but the GHAS is not, then that's a mis-match that may not be optimized. Do you agree? ("you" is plural, but also elmerzasty )

[terahertz]

Here's a pdf about the M5, which we share the same diff.

http://f10.m5post.com/forums/attachm...2&d=1360773149

Within this PDF, it says:
The GHAS control unit monitors the drive dynamic parameters from other control units
on the FlexRay data bus and determines the locking torque to be applied. The DSC control
unit can make and overriding requests with regard to the differential lock for stabilizing
the vehicle when the DSC system is activated or deactivated.

Now, to find out what the other control units are. On Page 49:


Therefore, the ICM and DSC coding could have affected the diff. Another factor could be the DME, but that's a flash and not coding.

IIRC when comparing ZCP to nonZCP coding a year ago, there were no coding changes identified for the GHAS for ZCP.

[packetpilot]

Originally Posted by terahertz

IIRC when comparing ZCP to nonZCP coding a year ago, there were no coding changes identified for the GHAS for ZCP.

Good to know that the diff's the same there--new info for me.

I do believe there's a delta from [edit: normal and] ZCP [cars] to GTS, but I'll have to confirm that. I've been converting (VO-coding) GHAS to GTS and I'm rather sure I wouldn't have started doing that if the coding is identical.

[packetpilot]

This also is worth posting for reference; it's the new ZCP copy on the (new) configurator.

Experience pure high-performance and ultimate motorsport feel with the specially developed Competition Package. The enhanced dynamics deliver faster acceleration (-0.1s for 0-60 mph), which come from a horsepower increase of +19 to 444hp (vs. 425), more direct steering ratio, Adaptive M Suspension with new settings in all 3 modes, New DSC setting and New setting for Active M Differential.

[terahertz]

Originally Posted by packetpilot

Good to know that the diff's the same there--new info for me.

I do believe there's a delta from [edit: normal and] ZCP [cars] to GTS, but I'll have to confirm that. I've been converting (VO-coding) GHAS to GTS and I'm rather sure I wouldn't have started doing that if the coding is identical.

Can you do a diff with GTS for us? I'm curious what changed as well.

[packetpilot]

Civic and ZCP are equal.

GTS has two differences aside from signature,
DSS IPM and DSS TASC
Both set to F082GTS

On a car with 0715 prod date and 16_11_502 I-STEP

[packetpilot]

ZCP DSC coding and GTS GHAS (lsd) can coexist. I did have to re-train GHAS in ISTA.

I wonder if this happens automagically with some driving, as some ranges are learned in other ECUs. I vaguely remember this happening with DSC over a year ago on my car (before I had ISTA) and it disappeared. Can anyone confirm they've seen DSC errors after coding that disappear? "Chasis Stabilization: Drive Moderately" CCM and a lit-up orange skid light [i]next to[i] the identical light that comes on for MDM/DSC Off...

[terahertz]

Thanks. I'll give it a try.

The only time I needed ISTA was when I set the VDC to ZCP on an old version of the car software. Something about the height sensors needed to be recalibrated. Also when I did a firmware update.

[terahertz]

What software version are you on?

I don't have the F082GTS option on my 58.3 car.

[packetpilot]

Originally Posted by terahertz

What software version are you on?

I don't have the F082GTS option on my 58.3 car.

16_11_502 I-STEP (mentioned earlier in thread) which I'm fairly sure equates to 60.1.

[packetpilot]

[wrong thread]

[packetpilot]

Some interesting finds in DSC within 60.1:
- Cornering Brake Control, active on M vehicles
- Power Oversteer Assist via GHAS
- (Potentially) Why GTS DTC doesn't work--different from brake caliper variant

[jim996]

My Civic M4 has lowering springs fitted and came on 58.0 software.

I had already updated the dampers (CP settings), traction control and ICM to 60.1.

I coded my Diff and Steering to 60.1 last night from 58.0 and I've definitely noticed an improvement in the steering feel. More positive and has lost the dead spot when driving in a straight line. Definite improvement.

More difficult to tell with the Diff yet as the road was wet this morning but it does give me some peace of mind that the ICM, traction, GHAS and VDC are all now running on the same software level.

Thanks for the info on this thread!

[Slimjim8201]

Originally Posted by jim996

My Civic M4 has lowering springs fitted and came on 58.0 software.

I had already updated the dampers (CP settings), traction control and ICM to 60.1.

I coded my Diff and Steering to 60.1 last night from 58.0 and I've definitely noticed an improvement in the steering feel. More positive and has lost the dead spot when driving in a straight line. Definite improvement.

More difficult to tell with the Diff yet as the road was wet this morning but it does give me some peace of mind that the ICM, traction, GHAS and VDC are all now running on the same software level.

Thanks for the info on this thread!

Picking up my MY17 F80 this afternoon. Assuming my car will be on the latest software, will I need to do anything to notice the steering improvement you mention? Was the improvement due to updated software or coding the car to a non-stock setting?