4.0TFSI COD (Cylinder on Demand) disable?

[jcarlson]

Has any tuner come up with a solution to disable the COD (4 cyl mode) functionality? I hate it. Don't give a damn about fuel economy but I'm really bothered by this feature in daily driving.
Especially with a cold(ish) engine I can often feel the 4/8-transitions as a hiccup as well as some 4cyl vibrations at low rpm and high gear. Those fancy motor mounts do help but they aren't perfect.
One big positive with the engine always being in V8 mode is that you avoid V4 sounds in case you install aftermarket non-valved exhaust or force the stock valve always open.

Considering APR tune but this possibility would be a definite trigger for me.

[gk1]

.... 4cyl vibrations at low rpm and high gear.

What RPM?
I find it hard to give it light enough throttle in high gear to keep it from switching out of 4-cyl mode.
I consider myself to be very sensitive to these sort of things and I only occasionally notice it switching from 4 to 8 mode. Perhaps you have a broken motor mount?

[jcarlson]

Between 1200-1500rpm. Not very high gear, but relatively, maybe 5th or so (have a RS6 with the 8-speed ZF).
Broken motor mount is a possibility of course, idle is very smooth though and load change shocks etc. also seem "normal", haven't driven other 4.0TFSI cars though.
Watching the indicator at the same time I'd say I notice maybe 25% of the transitions, and a bit more often when switching from 8 to 4 cylinders.

[cohall]

Are you close enough to your shop to have it checked out before you try and deactivate it? I'm with gk1 - I've never, not even once, noticed it switching between modes...unless I'm actually watching the indicator. I actually switch to the indicator once in awhile just to make sure it's still working! I wonder if there is an issue that needs to be serviced?

[goliath1]

I never notice as well. In fact, I can cruise at over 75mph and the bar remains green indicating 4cyl mode

[SilveR316]

How many of you that never notice the change are running aftermarket exhausts?

I would occasionally notice the change before my exhaust, but it was rare. It was more noticeable if you were at part throttle and then gave it a little bit more.

Now that I have my AWE exhaust on, it's much more noticeable (especially with the sound difference). I really wish a tuner would disabled cylinder on demand when in S or M mode. Keep it in regular D mode which is what I'm in if I care about fuel economy.



I'm also wondering if the COD feature doesn't work correctly after disabling the exhaust valves? I read this a while back in an old thread, but no one ever reached a conclusion. Would buying the valve emulator caps from AWE or Milltek possibly solve the problem?

[richib86]

drives me absolutely MAD, with intake and exhaust it sounds like complete garbage and am in for a fix to disable it entirely. i hear it ALL THE TIME

[SilveR316]

drives me absolutely MAD, with intake and exhaust it sounds like complete garbage and am in for a fix to disable it entirely. i hear it ALL THE TIME

I'm sure tuners can disable it in sport and manual modes. It's just a matter of asking for it.

http://www.audizine.com/forum/showth...1#post11958599

[Webtoker]

How many of you that never notice the change are running aftermarket exhausts?

I would occasionally notice the change before my exhaust, but it was rare. It was more noticeable if you were at part throttle and then gave it a little bit more.

Now that I have my AWE exhaust on, it's much more noticeable (especially with the sound difference). I really wish a tuner would disabled cylinder on demand when in S or M mode. Keep it in regular D mode which is what I'm in if I care about fuel economy.



I'm also wondering if the COD feature doesn't work correctly after disabling the exhaust valves? I read this a while back in an old thread, but no one ever reached a conclusion. Would buying the valve emulator caps from AWE or Milltek possibly solve the problem?

I have noticed this too. I have the AWE Touring and drone starts to occur at lower RPM ranges.


Sent from my Tapatalk

[jcarlson]

Are you close enough to your shop to have it checked out before you try and deactivate it? I'm with gk1 - I've never, not even once, noticed it switching between modes...unless I'm actually watching the indicator. I actually switch to the indicator once in awhile just to make sure it's still working! I wonder if there is an issue that needs to be serviced?

I don't really ever hear COD activation (factory sports exhaust, flap untouched) but I can often feel the bumps instead, especially at lower vehicle speeds. I guess I'll take it to the dealer since the car is still under extended warranty, hopefully it's caused by a broken motor mount.

I'm working in ECU development myself so I asked around a bit and got confirmation from one with access to RS6/7 parameter definition file that it is a simple task to completely disable COD with a tune if one wants it.

[Dasquade]

Not sure if this is the most active topic regarding COD, but for what it is worth...
Finally went back to sub-dealer of JD engineering to get my stage 2 adjusted so it no longer has COD.
I decided to remove COD completly in all gears (COD can only be reprogrammed in terms of gears, not linked to drive modes sadely). Some left COD active in the 7th gear.
Sadely i don't have more info on how my tuner gets access to the programming (deep ECU folder access etc), but end result is, no longer COD on my car :).
Finally a smooth V8 sound with no dips or fucky sounds (catless non res milltek).

[elptxjc]

Two things. First, Goliath said this (can't reply with quotes anymore for some reason): 'In fact, I can cruise at over 75mph and the bar remains green indicating 4cyl mode'. What 'green indicator' is that? Was under the impression there's no way to tell when 4 cyl mode is active. Second, wasn't true that putting stability/traction control in 'sport' disables COD? But guess without an indicator is hard to know on stock cars. I was trying to avoid COD during break-in, but going on an 800-mile tirp (each way) starting tomorrow, and wanted to avoid it on the way there. Or at least until the odo hits 600 miles (170 now).

[mavpsire]

Its this one here ... not sure if the img will work. The bar turns green in 4cyl mode.

[jsilas]

Not sure if this is the most active topic regarding COD, but for what it is worth...
Finally went back to sub-dealer of JD engineering to get my stage 2 adjusted so it no longer has COD.
I decided to remove COD completly in all gears (COD can only be reprogrammed in terms of gears, not linked to drive modes sadely). Some left COD active in the 7th gear.
Sadely i don't have more info on how my tuner gets access to the programming (deep ECU folder access etc), but end result is, no longer COD on my car :).
Finally a smooth V8 sound with no dips or fucky sounds (catless non res milltek).

Glad to hear it was successful. Please keep us posted on how mileage is impacted - this is something I would like to pursue further but I’d want to be confident the loss of mileage wouldn’t be severe.

[Dasquade]

In my case (stage 2)...on the highway i saw the fuel consumption raise from 8 to 10l/100km. Not sure how much that is in gallons/miles...
City driving shouldnt raise so much as it doesnt go into cod that often.

[1975audi]

Sub'd
I too would love it off permanently

[kpriv]

thank you for the info dasquade. I would love to remove this permanently as well, but based on my read of your description of how it works, I think the chance of APR doing this is virtually zero.

Who knows, maybe they could create an option like choosing your launch parameters for the TCU tune, but my guess is they will want COD active on their base tune so they can advertise the fuel economy. Hence, no dice for those of us who could care less. Hopefully I am proven wrong!

[Dasquade]

thank you for the info dasquade. I would love to remove this permanently as well, but based on my read of your description of how it works, I think the chance of APR doing this is virtually zero.

Who knows, maybe they could create an option like choosing your launch parameters for the TCU tune, but my guess is they will want COD active on their base tune so they can advertise the fuel economy. Hence, no dice for those of us who could care less. Hopefully I am proven wrong!

I find it very odd APR doesn't provide it as an option for those who want it. I'm sure they (APR) also know how to code the COD. Maybe try to contact them, i'm sure several want it.....

[elptxjc]

As a side comment, found out today what other forum member mentioned about a 'green bar' showing when COD was on. I think he was talking about the fuel economy graph, which you select thru the steering wheel. Anyway, tried disabling ESC/TC, releasing throttle, then reapplying it again, and bar went green again, meaning turning ESC/TC to sport mode didn't disable DOC. Doubt turning it off at some other time (like before starting engine) would change that, but maybe it does. Will try it next time I remember, and check for that. So right now it looks like NOTHING we owners can do on a stock car can turn DOC off. If VCDS can do it, it'd be another reason to buy it, but since that can help fuel economy way more than start/stop, it'd be nice to only stop it when we want, not permanently.

[RAF_S7]

The green bar is just an indication of how economically your driving. When you drop into CoD, the display below the green bar actually says “4 Cylinder Mode” or words to that effect.

[Dasquade]

As a side comment, found out today what other forum member mentioned about a 'green bar' showing when COD was on. I think he was talking about the fuel economy graph, which you select thru the steering wheel. Anyway, tried disabling ESC/TC, releasing throttle, then reapplying it again, and bar went green again, meaning turning ESC/TC to sport mode didn't disable DOC. Doubt turning it off at some other time (like before starting engine) would change that, but maybe it does. Will try it next time I remember, and check for that. So right now it looks like NOTHING we owners can do on a stock car can turn DOC off. If VCDS can do it, it'd be another reason to buy it, but since that can help fuel economy way more than start/stop, it'd be nice to only stop it when we want, not permanently.

Just so this doesnt lead to misinformation or confusion. COD cant be coded with vcds. COD gets controlled by the ECU and those parameters cant simply be altered, hence why only tuners (with the know how) can alter it. Your local dealer might be able to access and fix it too but most likely tgey wont help out.

[gk1]

As a side comment, found out today what other forum member mentioned about a 'green bar' showing when COD was on. I think he was talking about the fuel economy graph, which you select thru the steering wheel. Anyway, tried disabling ESC/TC, releasing throttle, then reapplying it again, and bar went green again, meaning turning ESC/TC to sport mode didn't disable DOC. Doubt turning it off at some other time (like before starting engine) would change that, but maybe it does. Will try it next time I remember, and check for that. So right now it looks like NOTHING we owners can do on a stock car can turn DOC off. If VCDS can do it, it'd be another reason to buy it, but since that can help fuel economy way more than start/stop, it'd be nice to only stop it when we want, not permanently.

It been discussed before. ESC-sport mode and trans in S or manual from S then COD is disabled in stock cars. Although at the same time brake guard etc. is disabled though.

[Kczach]

The green bar is just an indication of how economically your driving. When you drop into CoD, the display below the green bar actually says “4 Cylinder Mode” or words to that effect.

I wonder if this is a North American thing. I've seen the videos of the "4 cylinder mode" popping up. Mine has never done this. With mine the entire bar turns from white to green (not just the side of the bar that turns green when you are going easy on the gas).

[fastguy]

It's in the owners manual I believe...for at least the 2013 model, the green bar indicates 4 cylinder mode.

And fwiw, I have (according to vcds scan) a defective active engine mount. Just haven't go around to replacing it yet. I have a stage 1-2 tune with stock exhaust and mine is normally not noticeable at all. Every once in a while it gives me a funny hiccup at lower speeds but I attribute that to the DSG trans or the mechatronic trying to figure out what to do.

[jsilas]

I know this is an older thread, but I wanted to share good news: APR have created a beta flash which disables Cylinder-on-Demand on my 2016 S6!! I've started a new thread with the relevant details if you're interested: https://www.audizine.com/forum/showt...1#post13241296