BMW Dual Vanos

Hello

In the near future i have to tune an S54 engine equiped with the well known vanos unit. Now i was wondering how you start tuning de cam maps. With only variable intake timing i know you can tune them the way you tune the ignition map(as mentioned in the webinar). But how do tune both the intake and exhaust cam maps because the relation between eachother also effect the VE of the engine. Do you start with tuning one map or tune them the same time ? Would someone have a guideline what steps you have to consider for tuning both maps?

Andre: I've seen that you've post a base map of an s54 u tuned with a vipec ecu, but unfortunately i have no login on the old forum so i could not download the attatched file. Would it be possible to post the file again?

Typically the engine will be more sensitive to changes in the intake cam than the exhaust. I tend to start by optimising the intake cam and then follow this with the exhaust. Of course as you move the exhaust cam you may find that there is benefit in then adjusting the intake cam further so the whole process is iterative. Then you need to consider fuel and ignition too as these will need to be altered. While it's not an S54 engine, I'd recommend watching the webinar we did on the cam control on the FA20 engine - https://www.hpacademy.com/previous-webinars/how-to-dyno-tune-cam-control/

I've attached a startup map for the S54 however this was for a fairly heavily modified engine running Schrick cams, high compression pistons and E85. I'd imagine that the cam timing maps will be quite different for a factory cam but here it is for what it's worth. Use it with caution.