Quote:
Originally Posted by MisterEm
Sorry for the OT, I heard some of the same information about the E46 as @SYT_Shadow has as I dug deep into an off the chart build. Some of it wrong, some of it right....but always regurgitated as gospel on the interwebs. We know there is quite a bit of bad information about cams and vanos compatibility on the forums on the S54. I really hope the S65 doesn't have this problem as well. Caused a lot of frustration for me pushing the limits...
Some of this info comes from the cam manufacturers and vendors themselves. Found this out the hard way. Lift combined with aggressive duration is more the issue with vanos on the S54. But it is also the key to making max NA power...
-304/296 schricks have 14mm of lift. Very tight but possible to retain vanos with limited range and overlap down low.
-288/280 13.5 mm lift. Plenty of room to retain.
We dry tested 288/280 (13.5), 296/304 schricks (14) with stock and basic 12.0 pistons the old fashioned way with vanos on since nobody from Schrick or who sold Schrick's could give us an answer on clearance. (except Crower cams). So we advanced and retarded each cam 5 degrees. Measured and checked PTV with these cams. Rinse and repeat. Took a while but we learned a lot.
Sooo...we sold the schricks and went with custom Crower cams with 14.5 and 14.0mm of lift 292/282 duration. Full VANOS retained and passes factory DIS VANOS test. Crower had better customer service, provided tech information and cheaper than Schrick. Not to mention...Schrick messed up the cam keyways on a batch of 288/280's std lift after they had financial issues a while back. There is a large batch circulating that will never get full vanos functionality with the keyways 10+ degrees off... unless whomever tunes them figures it out.
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Interesting. How is normal driveability on the 292/282? Any idle issues?