Cam offset for 288/280

[JonParks]

0 and 3 is correct for the 288 / 280s; 0 and 1 for the 280/272s.

Is this correct for Schrick?
0 inlet and +3 on exhaust for 288/280s.

I ask because I see PaulClaude refer to stock M3 offsets working well above.



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[SliM3]

Not trying to throw salt in the game here, but how are you guys coming up with these numbers?

I actually degreed my CAT 288/280's last year, verifying crank angle vs peak valve lift with the cams at the parked position. I started to take pics but it became such a PITA I just said F-it and threw the camera 😂.

Anyway, intake came in at roughly 134° ATDC, and exhaust was on the money @ 52° ABDC (or 128 BTDC, however you want to look at it).

[JonParks]

Tried 0 inlet and 3 exhaust.
It adapts using these offsets but wonder if this is correct or if it affects anything if not?

If the stock offsets are correct I would get lover adaption values it looks like.
-2.7 and 1.7 if I understand this correctly.

Running 288/280 Schrick cams.
Would love some input 🙂



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[MpowerE36]

Tried 0 inlet and 3 exhaust.
It adapts using these offsets but wonder if this is correct or if it affects anything if not?

If the stock offsets are correct I would get lover adaption values it looks like.
-2.7 and 1.7 if I understand this correctly.

Running 288/280 Schrick cams.
Would love some input 🙂



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If you have correctly mechanically built your cameshafts, why don't you just compensate your inlet and outlet vanos adaptations thanks to offset parameters ? I did that on Dbilas camshafts and it works perfectly after tuning injection and ignition. With such adaptation values, the vanos test will not pass.

[JonParks]

If you have correctly mechanically built your cameshafts, why don't you just compensate your inlet and outlet vanos adaptations thanks to offset parameters ? I did that on Dbilas camshafts and it works perfectly after tuning injection and ignition. With such adaptation values, the vanos test will not pass.

I have adapted the offsets to what Terra recomends above for 288/280 cams.
0 inlet and +3 exhaust.

I did a Vanos test today.
Passed that.






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[MpowerE36]

My Vanos test didn't pass with too high vanos adaptations and after ajusted the offset parameters to have approximately zero adaptations, it passed. It was with the DIS V57.

[paulclaude]

0 and 3 is correct for the 288 / 280s; 0 and 1 for the 280/272s.



The cams won't physically move, the VANOS has no mechanism of doing that as everything is bolted in place. The targets will be shifted by the offset + adaption values.

Late to reply as not much free time these days. Offset + adaptation will always be the same value, but is fully dependent on where the cams are mechanically set in the first place. E.g setting a tune offset of 0 on the inlet cam with an adapation of -3 equals -3 total. If you change this to an offset of -2 it will shift the adaptation value to -1, so again -3 total. So I believe as long as the camshaft adapts the offset value matters little, it is the mechanical setting of the camshafts that is most important.