VANOS Adaptation Values

[Cubieman]

Any reason you don't want to read off the tune from your car and adjust the offsets yourself?

I don't know how to do that. I've got a partial read via BMWflash so I could use Martyn's tool to change a few things if I wanted to in the future and that's about all I've done/know how to do at this point. I've got all the misc INPA programs that came off bimmergeeks standard tools dload.

[terra]

I had this very thing happen after my CSL conversion by Kassel, I called and they told me that unless otherwise noted all of their "standard" tunes they throw on after the CSL software is flashed accounts for US Spec. cams.

I did not have this error before the conversion. The code came up twice. I reset adaptations and it has yet to come back after 3 separate 1+ hours drives.

I am still working on a way to run a Vanos test as I cannot get one done locally.

Any reason you don't want to read off the tune from your car and adjust the offsets yourself?

[Cubieman]

...It's common for the CSL software to throw an inlet vanos code as the offset value within the CSL mapping is +5deg more than the stock M3 SW versions, due to CSL vs. M3 camshaft grind difference. This should be corrected if running the CSL SW on stock camshafts.

I had this very thing happen after my CSL conversion by Kassel, I called and they told me that unless otherwise noted all of their "standard" tunes they throw on after the CSL software is flashed accounts for US Spec. cams.

I did not have this error before the conversion. The code came up twice. I reset adaptations and it has yet to come back after 3 separate 1+ hours drives.

I am still working on a way to run a Vanos test as I cannot get one done locally.

Adaptations before they were reset:

[Tbonem3]

Mine is on stock tune and 98 Ron (super unleaded in UK)

Stock euro tune I would assume. I wonder if the values in this tool are U.S. or if there's even a difference between u.s. and euro.

Fuel is high octane enough, 98ron is 93 here I think.

[paulclaude]

2.8's not bad, mine's about 3. Could be better, but it's unclear to me that it actually affects anything. I mean, in theory, the point of the adaptations is that it shouldn't matter whatsoever, as long as you're within the adaptability range, the adaptations fix your imprecision and it runs as if it was perfectly timed? Is this too naive?

The Vanos adaptation values are simply to allow for mechanical error when timing the cams and to 'sync' the camshaft timing values with the ECU zero points. They won't actually correct for any mechanical error.

It's common for the CSL software to throw an inlet vanos code as the offset value within the CSL mapping is +5deg more than the stock M3 SW versions, due to CSL vs. M3 camshaft grind difference. This should be corrected if running the CSL SW on stock camshafts.

[Neil I]

What fuel? What tune?

Mine is on stock tune and 98 Ron (super unleaded in UK)

[Tbonem3]

What fuel? What tune?

[Neil I]

These are my results. Vanos has never been apart so timing is as it was when car left the factory. Car runs perfectly (57k miles). Your vanos figures look fine, and within spec. I’m now worried about my retarded ignition timing which seems much more than everyone else 🤔

[Cubieman]

In that case your timing was likely within the range of adaptions for the stock tune, but off enough to fall out of range when running the CSL offsets. If timed near perfectly the CSL offsets aren't typically different enough to cause issues.

Gotcha, I didn't quite follow when explained previously. I suppose worst case the engine will have to be re-timed anyway for an upcoming Vanos lockdown and this can be resolved at the point in time.

[terra]

Interesting to me that it didn't throw this code before CSL software was loaded and (supposedly) US Spec. Cams were taken into account in the tune.

Hopefully the Vanos test will tell more. I reset adaptations and drove it for a while no faults if that means anything. I should have left it alone for the techs to check out. $$$

Reset and drove around for about an 20 minutes at all sorts of RPM ranges. I could kind of sense that upon startup the computer was maybe re-learning, a bit of idle hunting for a sec, and I don't mean the cold start 😉

In that case your timing was likely within the range of adaptions for the stock tune, but off enough to fall out of range when running the CSL offsets. If timed near perfectly the CSL offsets aren't typically different enough to cause issues.

[Cubieman]

Most likely means you're mistimed beyond what the adaptions can compensate for (+/- 8 degrees)

Interesting to me that it didn't throw this code before CSL software was loaded and (supposedly) US Spec. Cams were taken into account in the tune.

Hopefully the Vanos test will tell more. I reset adaptations and drove it for a while no faults if that means anything. I should have left it alone for the techs to check out. $$$

Reset and drove around for about an 20 minutes at all sorts of RPM ranges. I could kind of sense that upon startup the computer was maybe re-learning, a bit of idle hunting for a sec, and I don't mean the cold start 😉

[terra]

Yeah, I just wonder if similar to finding the "sweet tooth" on the helical gears to get more range of motion. It seems like having an adaptation value greater than 0 might cut in to the maximum range of adjustability. But this is just my (likely flawed) logic

In theory you would think that, but I think the adaption range is built into the tolerance. If you were to run a vanos test, you'd find it runs through the full range. I wouldn't worry about 3 degrees, it's difficult to get it truly spot on.

That does suggest if you were able to get it perfect you could increase the limits within the DME. But that's probably not really worth it.

The fault code I have currently (94) is for the inlet vanos adaptation and the apdation value is 0. No lights, just a code that has been cleared once and came back.I wish I had a better understanding of these things.
Getting a Vanos test tomorrow morning.

Most likely means you're mistimed beyond what the adaptions can compensate for (+/- 8 degrees)

[Cubieman]

The fault code I have currently (94) is for the inlet vanos adaptation and the apdation value is 0. No lights, just a code that has been cleared once and came back.I wish I had a better understanding of these things.
Getting a Vanos test tomorrow morning.

[beefaroni]

Yeah, I just wonder if similar to finding the "sweet tooth" on the helical gears to get more range of motion. It seems like having an adaptation value greater than 0 might cut in to the maximum range of adjustability. But this is just my (likely flawed) logic

[ATB88]

I tried out Martyn 's new program. Cool stuff! I believe I remember reading that the VANOS adaptations can be +/- 8 degrees on each cam. Dont quote me on that. Does anyone have VANOS adaptations to compare? I recently did the VANOS lockdown and felt like I did a pretty bang-up job retiming the engine but the 2.8 degree adaptation on the Exhaust could probably be better 😁 She runs like a damn champion though. No complaints. How should one use this sort of data?.

2.8's not bad, mine's about 3. Could be better, but it's unclear to me that it actually affects anything. I mean, in theory, the point of the adaptations is that it shouldn't matter whatsoever, as long as you're within the adaptability range, the adaptations fix your imprecision and it runs as if it was perfectly timed? Is this too naive?