VANOS Adaptation Values

[beefaroni]

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?.

[Cubieman]

I'm curious as well, I've got a Vanos related error code (94) after a CSL DME swap.

[beefaroni]

You need to see what’s wrong with cylinder 7 and 8. Looks pretty serious!

[jbfrancis3]

You need to see what’s wrong with cylinder 7 and 8. Looks pretty serious!

Damn you! Got me to look back, well played

[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?

[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

[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.

[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]

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]

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]

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.

[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 🤔

[Tbonem3]

What fuel? What tune?

[Neil I]

What fuel? What tune?

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

[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.