Single or Double VANOS for turbo?

[Archiem111]

I'm in the process of building up a m52 for my e30 with intentions of turbo down the track. And to save me from future headaches I need some Vanos advice. I have both a e36 single Vanos head and a e39 double Vanos heads available. I am wondering which one I should choose.

What are some pros and cons for each? And which one would you choose an why?

And also should I bother flashing and tune the stock ecu or should I just go standalone from the start?

[Nutzy]

I guess it would depend on the capabilities of your (aftermarket?) ECU you intend to run. Also how much dyno time development you want to put into tuning the vanos.

I run single M50B28 vanos with a turbo, it def makes a difference and the setup is simple.

[Archiem111]

I have both Ecu's to match but they haven't yet been flashed to get rid of EWS. So I was thinking the standalone should be an option from the start?

And to tbh I have no real knowledge of ECU's how to tune and no real interest in learning atm. I want to have it professionally tuned to save me the trouble. Unless this is not an actually possibility and I will have to do it myself?

So are you saying tuning a single Vanos on the stock ecu is fairly straight forward?

[Nutzy]

Ah I'm using an SM4 ECU to run mine. Stock ECU with a flash should be fine - a tried and true path. No idea who can tune it in Bris tho.

[Northern]

I have both Ecu's to match but they haven't yet been flashed to get rid of EWS. So I was thinking the standalone should be an option from the start?

And to tbh I have no real knowledge of ECU's how to tune and no real interest in learning atm. I want to have it professionally tuned to save me the trouble. Unless this is not an actually possibility and I will have to do it myself?

So are you saying tuning a single Vanos on the stock ecu is fairly straight forward?

Can't say anything about the dual vanos stuff, but there's lots of support out there for the M52/S52 Siemens MS41 ECU. Romraider, and <$100 worth of cables and flash program make it easy to delete EWS and emissions crap, and tune if you want. Otherwise there are a bunch of people who do turbo tunes for the stock ECU.

Single vanos is on/off, just wire it up for the standalone to turn on/off based on RPM. Probably best to mimic stock vanos activation as close as you can to start.

[Northern]

Plus with the single vanos heads, you can run S5x cams or any of like a dozen aftermarket cams. I don't think selection is as good or as cheap for the M52tu

[Archiem111]

Thanks mate. So there aren't any real benefits of having a dual Vanos system? All the aftermarket support the single Vanos seems to outweigh the other. Yeah I was planning on also upgrading the cams to a s52 set.