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BMW S54 (or [https://en.wikipedia.org/wiki/BMW_M54 S54B32]), as in the e46 M3, M coupe, and M roadster Probably the most advanced BMW I6 engine, BMW was criticized for ending manufacturing (in favor of the shorter V8-s). Fully supported by VEMS (order with proper options, see below). 3.2 liter '''Dual VANOS''', Individual Throttle Body, 333(US)/338(EU)bhp factory spec. * Cylinder bore: 87 mm * Displacement of 3,246 cc * High pressure Double VANOS continuously variable valve timing system with faster operation at high rpm * Compression 11.5:1 * Finger-type rocker arms for reduced reciprocating mass and friction * One-piece aluminum head casting for lighter weight * Scavenging oil pump to maintain pressure during heavy cornering VEMS ECU Config: '''BMW S54 dual-VANOS engine: VR, HALL, HALL + 4 * PFET high-side switches''' for the 4 hydraulic cam-actuator solenoids * There are 3 engine speed sensors. One on the crank (VR) and one on each camshaft (HALL), so order ECU with 3 trigger inputs * order ECU with '''4 PFET''' high side drivers for the camshaft solenoids since they require switched 12V, not switched GND like traditionally run solenoids. * '''8 IGBT''' recommended * 2nd RS232 might be useful, eg aim=>CAN setup for BmwCanEFortySix * ETC (DBW drive by wire Electronic Throttle Control) supported, all the usual things apply: ** read VT help ** ETC is for careful, experienced installers. Understand the concept and details, create your page from MembersPage , configure with safety relay, check the margins, ... ---- '''Piggyback install''' One might choose to make install simpler, taking over fuel/spark/air/controls completely, but keep the factory ECU * to satisfy dash and air conditioner (CAN-bus) The '''factory ECU shares the following inputs with VEMS ECU''': '''primtrig crankshaft VR sensor''' * '''Sharing primtrig VR causes loss of RPM signal on VEMS side at 6500rpm (Rija Robinson)''' ** with standard 18k primtrig VR pullup ? ** VR sensor resistance ? '''VR DC voltage measured''' (ign on, engine NOT running) ? ** Is it related to primtrig VR DC bias ? (too high DC voltage perhaps ?) The VR signal is not going below 0mV at high RPM ? That is a bit unusual. Do we have chance to Oscilloscope the signal ? * GND (of course) * +12V power * '''CLT''' ** order "VEMS ECU without CLT pullup" (2k7 pullup to +5V can be easily installed later if the factory ECU is removed) * '''MAT ?''' (VEMS needs it, perhaps the factory ECU does not need it ? ** If factory ECU needs MAT: order "VEMS ECU without MAT pullup" (2k7 pullup to +5V can be easily installed any time)
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