MSefi.com read only forum (Jan.15,2018)

Yes. It requires no cam sync signal. Batch firing does not care if the engine is TDC on exhaust or intake stroke of #1. Works great on every BMW before 92. After that, misfire detection with the ability to shut off individual cylinders, stricter emissions at idle, etc. pushed manufacturers to ...

Sub-throttles are mostly for bikes. Basically, they are designed to keep you from having super jerky throttle response (potentially dangerous on a 180+hp sub 400lb machine) by moderating the rider's input. Not really necessary on a car. A CV carb is similar in operation, except it is automatic. IIRC ...

Got this off of Alldata:

Functional Description VANOS (Variable Camshaft Control) :

Control unit is activated by relevant engine control unit. The control unit operates a regulating element via a solenoid. In this manner, engine oil pressure is supplied to both sides of a hydraulic plunger ...

Morbo,
M52TU motors are electric over cable throttles, and M54 are drive by wire. Otherwise, these engines are very similar. I have posted to a professional forum and will have an answer soon.
-Paul

I am not sure of that myself. I know that cam timing changes that occur are not instantaneous, so maybe that has something to do with it. I'll see what I can find and check back.
-Paul

Well, as far as I can tell, the M52TU and the M54 have single stage VANOS for both intake and exhaust. They have the same type of solenoid as the single, just an extra cam sensor on the exhaust to determine whether or not the VANOS is doing what it is supposed to. For all the ones I have worked on ...

BMW related (some applicable to other cars)

How about control for VANOS (single, dual, and fully variable M car)- single and dual are just solenoids activated with a ground signal based on RPM/load

DISA (dual resonance intake) - Same here, except that the early DISA only requires activation of a ...