CS vs GTS coding

[CanAutM3]

Originally Posted by TopJimmy

I believe all GTS dampers are manual adjust, not EDC, so coding doesn't apply.

A wee bit bit late to the party are we ?

[RugbyBro]

Just had the GTS suite coded on by kubax86. Great to work with, quick and easy. This is on a 2016 Base F82.

Initial impressions from a short light-med drive are:

DCT: Need to drive a bit harder to get a better feel on this, feels a bit more immediate and I drove in S3 and it felt great (not overly dramatic). Still feels like a hard gear shift but just not like you're in a slingshot.
Steering: Most immediate thing I noticed, more sensitive and less "dead". Not sure why the car didn't come like this to begin with. It's a small but high impact difference from base steering.
Diff: Takes off from lights much smoother - less 1. engage clutch 2. feed throttle and more 1. engage clutch while feeding throttle
MDM: Didn't have time or space to test this out

[RugbyBro]

Driving around today and I have the following thoughts:

Steering: Really like it, it’s only like 5% better than stock but it’s a 5% difference where it counts. It feels like stock steering but with a more sensitive on center feel. Definitely not hydraulic feeling, and still a bit indifferent about where the front wheels are, but very accurate as F8X has always been.

DCT: Again only like a 5% difference, but really where it counts and most noticeable in slower speed situations. The gearbox just engages when you want, no clutch slippage. And I’m not talking about any D modes as I almost exclusively drive this thing manually, but there is no hesitation about getting into any gears in low speed when you tell it to. There used to be all sorts of clunks and thuds at low speed like the TCU was trying to decide whether to engage or slip or disengage, and now those are all completely gone... like they literally don’t happen anymore. And to quash anyone’s fear about performance shifting being less dramatic, it is still a hard/fast shift in S3 in the upper RPMs but the lurch in shift is slightly less drawn out - the car still senses lateral load so mid corner shifts are absolutely butter smooth (as they would be stock).

Diff: Wow, the car just goes. No hesitation, you tap the gas and go. Again this is very noticeable at slow speed situations. Leaving from lights is effortless, pulling onto the road from a lot just happens whereas before the car would slip the clutch and not put you into gear in the split second that you were expecting it to, so this is working in harmony with the improvement to the DCT. On some backroads, it feels like it has a bit more confidence in corners, feels a little more planted - this may be a placebo effect. I don’t push public roads to the cars limit so I have no opinions on at the limit situations yet.

Edit: just did a series of 3 point turns, and they were absolutely immediate with no hesitation and no slippage

[kubax86]

Originally Posted by RugbyBro

Driving around today and I have the following thoughts:

Steering: Really like it, it’s only like 5% better than stock but it’s a 5% difference where it counts. It feels like stock steering but with a more sensitive on center feel. Definitely not hydraulic feeling, and still a bit indifferent about where the front wheels are, but very accurate as F8X has always been.

DCT: Again only like a 5% difference, but really where it counts and most noticeable in slower speed situations. The gearbox just engages when you want, no clutch slippage. And I’m not talking about any D modes as I almost exclusively drive this thing manually, but there is no hesitation about getting into any gears in low speed when you tell it to. There used to be all sorts of clunks and thuds at low speed like the TCU was trying to decide whether to engage or slip or disengage, and now those are all completely gone... like they literally don’t happen anymore. And to quash anyone’s fear about performance shifting being less dramatic, it is still a hard/fast shift in S3 in the upper RPMs but the lurch in shift is slightly less drawn out - the car still senses lateral load so mid corner shifts are absolutely butter smooth (as they would be stock).

Diff: Wow, the car just goes. No hesitation, you tap the gas and go. Again this is very noticeable at slow speed situations. Leaving from lights is effortless, pulling onto the road from a lot just happens whereas before the car would slip the clutch and not put you into gear in the split second that you were expecting it to, so this is working in harmony with the improvement to the DCT. On some backroads, it feels like it has a bit more confidence in corners, feels a little more planted - this may be a placebo effect. I don’t push public roads to the cars limit so I have no opinions on at the limit situations yet.

Edit: just did a series of 3 point turns, and they were absolutely immediate with no hesitation and no slippage

Thanks a lot for your feedback of our GTS Performance Flash

[evo828]

RugbyBro thanks for the info. Not sure if you have EDC-Have you got also suspension coded to other variant? Any impressions on that?

[kubax86]

Originally Posted by evo828

RugbyBro thanks for the info. Not sure if you have EDC-Have you got also suspension coded to other variant? Any impressions on that?

Standard M4 has different suspension than ZCP/CS that's why I never recommend coding EDC to ZCP/CS as it just doesn't work properly.

You can code EDC on ZCP car to CS.

[evo828]

Thanks kubax86 for the headsup. I have a standard EDC 2016 M4, so I guess no other variants for me to try to slightly make the comfort more comfortable while keeping sport and sport+ the way they are

[RugbyBro]

Originally Posted by evo828

RugbyBro thanks for the info. Not sure if you have EDC-Have you got also suspension coded to other variant? Any impressions on that?

I didn’t get any EDC coded, so just whatever iStep I’m running (>2018) controls my EDC. I’m also lowered on MPHAS so I’m sure that would have some effect. When I say it’s more planted in corners I really don’t mean like suspension, more that there’s just a lot of grip on the corner and through to the exit - seems a bit more noticeable now but I’m not entirely sure as I haven’t been able to push it to the limit.

On your second comment on suspension, I personally only run sport and sport plus as I find comfort to bottom out on the bump stops with the lowered ride height. I just got used to it so now I think it’s perfectly acceptable. I’m hesitant to say comfortable as it’s not but I just don’t notice it anymore so I’ve just gotten more hardend to it lol. I’ve had people comment on the car’s stiffness, and also had an interesting Baja style first date going over some very rough roads in San Francisco

[evo828]

Most of the roads here in Central/Eastern Europe are not in a good shape that is why I hoped for a slightly improved comfort ride in comfort mode via coding. But sport is on most the time anyway.
May be I will try CS EDC when time will allow for a back to back drive compre.

[TopJimmy]

Originally Posted by evo828

Thanks kubax86 for the headsup. I have a standard EDC 2016 M4, so I guess no other variants for me to try to slightly make the comfort more comfortable while keeping sport and sport+ the way they are

I also searched high and low for the "extra comfort" setting for Base EDC. Checked BPM, Alpine...Kubax confirms here too.

BUT...I asked Tommy L Garage, he tried everything. Tommy said the BMW MP-HAS will give me the 1-notch-softer setting (and KW is one notch firmer). It worked great! All settings now ride about 1 setting softer...and sport+ is still plenty firm when needed.

[CanAutM3]

Originally Posted by RugbyBro

Diff: Takes off from lights much smoother - less 1. engage clutch 2. feed throttle and more 1. engage clutch while feeding throttle

Originally Posted by RugbyBro

Diff: Wow, the car just goes. No hesitation, you tap the gas and go. Again this is very noticeable at slow speed situations. Leaving from lights is effortless, pulling onto the road from a lot just happens whereas before the car would slip the clutch and not put you into gear in the split second that you were expecting it to, so this is working in harmony with the improvement to the DCT. On some backroads, it feels like it has a bit more confidence in corners, feels a little more planted - this may be a placebo effect. I don’t push public roads to the cars limit so I have no opinions on at the limit situations yet.

Edit: just did a series of 3 point turns, and they were absolutely immediate with no hesitation and no slippage

Not sure how you attribute most of these characteristics to the e-diff ? It sounds more DCT related...

[RugbyBro]

Originally Posted by CanAutM3

Not sure how you attribute most of these characteristics to the e-diff ? It sounds more DCT related...

Yeah sorry re-reading my post I wasn’t very clear... my use of slippage is a bit confusing and I mean it to be both applicable to the clutch and the tires (should have called this out specifically, doh!), both have been reduced and are working together very well. Specifically in low grip situations (loose surface) and on certain roads by me, I would have more tire slippage before and the rear end wouldn’t hook as quickly - purely anecdotal and I appreciate it’s not the best measure of the diff as it’s hard to tangibly present a difference here. All the changes are pretty small in isolation but they have made a noticeable difference in the car’s driving characteristics - certainly so with the DCT but definitely can feel it’s a little less fussy in the rear end

[sappersix]

I have a 2016 F82 ZCP 6MT and updated to I-Step F020-20-07-540 last year. This week, I also had GTS steering, GTS diff, CS EDC, and Euro CS MDM coded.

The changes in steering are minimal, but slightly improved, more direct. EDC feels more compliant. I honestly can't feel a difference in the diff, but haven't had a chance to drive it hard. In the same vein, I haven't tested MDM.

Hoping to find space to safely try MDM and to get to the track to test if the CS EDC (while allowing more roll) will decrease times.

So bottomline, if I had coded from F020-16-03-504, I think I would notice a bigger change. However, since I already had F020-20-07-540, I think the perceived changes are smaller.

Alex@alpine helped me code. Process was super easy and fast. Highly recommend.

[evo828]

I had similar experience - major change in the driving behaviour was after updating i-step from the 2016 (F020-16-03-503) version to 2020 (F020-20-07-525) version. Then the subsequent coding modification from stock to GTS (EPS, GHAS, DSC) was only a subtle change (not yet driven on the track)

[hellokitty]

Is F020-20-07-525 the latest version?

I have F020-19-03-522.

[kubax86]

Originally Posted by hellokitty

Is F020-20-07-525 the latest version?

I have F020-19-03-522.

Latest one is F020-21-03-XXX

[figure99]

Originally Posted by sappersix

I have a 2016 F82 ZCP 6MT and updated to I-Step F020-20-07-540 last year. This week, I also had GTS steering, GTS diff, CS EDC, and Euro CS MDM coded.

The changes in steering are minimal, but slightly improved, more direct. EDC feels more compliant. I honestly can't feel a difference in the diff, but haven't had a chance to drive it hard. In the same vein, I haven't tested MDM.

Hoping to find space to safely try MDM and to get to the track to test if the CS EDC (while allowing more roll) will decrease times.

So bottomline, if I had coded from F020-16-03-504, I think I would notice a bigger change. However, since I already had F020-20-07-540, I think the perceived changes are smaller.

Alex@alpine helped me code. Process was super easy and fast. Highly recommend.

Good feedback, let us know if you notice differences in the diff and MDM. It appears most people notice a significant difference if you're comparing it to stock.

Also, note that some suspension hardware is technically different on a CS which is what the CS EDC coding is optimized for. Some users have also performed the hardware updates to get the full benefit.

[Fat Goose]

Originally Posted by kubax86

Latest one is F020-21-03-XXX

Have you seen any changes from the 20-03 build?

[RugbyBro]

Another couple observations for this thread relating to the GTS DCT; just got back from a drive in S2 for the first time (been driving exclusively in S3).

- There is absolutely no drama in S2. Shift is still lightning quick under heavy load but barely any kick. You hear the shift but you don’t feel it. (Obviously you will still feel something in a heavy load high rpm shift, but if S3 is a blow-your-tire-out pothole then S2 is a minor road bump). This can be great if you like the DCT speed/response but not the drama. If you liked the minor drama in S2 before, then you probably won’t like this as much. Shifts under light to moderate load are typical S2 shifts in which the clutch is slipped a little more than a similar shift in S3.
- if you like drama, don’t worry... S3 is still brutal

[Fat Goose]

Originally Posted by figure99

Good feedback, let us know if you notice differences in the diff and MDM. It appears most people notice a significant difference if you're comparing it to stock.

Also, note that some suspension hardware is technically different on a CS which is what the CS EDC coding is optimized for. Some users have also performed the hardware updates to get the full benefit.

What suspension hardware updates have been performed to achieve the stock CS? Thanks!

[figure99]

Originally Posted by Fat Goose

What suspension hardware updates have been performed to achieve the stock CS? Thanks!

I believe it depends whether it's an M4cs or M3cs. The M3cs uses the ZCP dampers and rear sway bar, but the base front swaybar and all four springs. I'm not 100% sure what the differences are on the M4cs. https://f80.bimmerpost.com/forums/sh....php?t=1687204

[evo828]

just an observation on the steering coded to "GTS" - if you frequently drive on roads with uneven surface (like rails from heavier trukcs) - the steering tends to be very nervous - in that situation the "standard" coding is more user friendly (less nervous around the centre).