Guest |291| Posted March 18, 2009 Report Share Posted March 18, 2009 I have a question about using factory flywheel triggers and sensors as inputs into a V44 or V88. The engine in question is a BMW 4 cylinder with 2 flywheel triggers. One is triggered at 1 pulse per revolution, the other is triggered at 116 pulses per revolution. The factory sensors are reluctor type and the stock ECU is a Bosch Motronic. The intent would be to have the system set up to perform direct spark/sequential injection. 1. Can the 116 pulse per revolution trigger and sensor be used to determine crankshaft speed? 2. Can the 1 pulse per revolution trigger and sensor be used as a sync signal to determine the engine’s position in the firing order? I saw information by someone that lead me to believe that it could, but I don’t really understand how. If #2 above is not possible, and a dedicated cam trigger is required to perform direct spark/sequential injection, does the trigger point need to occur mechanically at TDC (using an adjustable mount to physically locate the sensor at TDC) or is there a software bias that allows the user to electronically adjust when the TDC signal actually occurs in relation to the trigger pulse? Thanks for the help, Wilfert Quote Link to comment Share on other sites More sharing options...
rayhall Posted March 19, 2009 Report Share Posted March 19, 2009 Wilfirt, The trigger pattern on this engine is supported. Select BMW M3 as the trigger. The M3 is a six cylinder, but this selection will work on the four cylinder, as it has the same number of teeth on the two crank triggers. Quote Link to comment Share on other sites More sharing options...
Guest |291| Posted March 19, 2009 Report Share Posted March 19, 2009 So, there is no need to install a new sensor that triggers only once per 720 degrees of crankshaft rotation to run a direct spark/sequential injection setup? How does the ECU know when cyliner #1 is at TDC of its compression stroke? I understand how a single trigger signal per cycle works on a wasted spark/batch fired injection setup, but don't understand how the ECU can tell what part of the cycle the engine is in without a trigger that fires once for two rotations of the crank. I checked the users manual, but it says you need to have a single pulse per 720 degrees of crank rotation to run a direct spark/sequential injection setup. Thanks again, Wilfert Quote Link to comment Share on other sites More sharing options...
rayhall Posted March 19, 2009 Report Share Posted March 19, 2009 Wilfert, No..it will be batch injection and wasted spark. For sequential and direct fire you will need 60 or less teeth on the crank and a cam sensor reading one tooth. Quote Link to comment Share on other sites More sharing options...
Guest |291| Posted March 19, 2009 Report Share Posted March 19, 2009 OK, that clears it up for me. Thanks for the quick responses! Wilfert Quote Link to comment Share on other sites More sharing options...
Guest |216| Posted April 15, 2009 Report Share Posted April 15, 2009 Wilfert. What BMW engine is this on, a S14? Did you get it to work with the original sensors? Eivind Quote Link to comment Share on other sites More sharing options...
Guest |291| Posted April 15, 2009 Report Share Posted April 15, 2009 Yes, this was in reference to the BMW S14. I do not currently have an ECU. My questions were to clarify things while I am doing research. I understand it can be done though, which will cut down on installation complexity. Wilfert Quote Link to comment Share on other sites More sharing options...
Guest |216| Posted April 15, 2009 Report Share Posted April 15, 2009 Yes, this was in reference to the BMW S14. I do not currently have an ECU. My questions were to clarify things while I am doing research. I understand it can be done though, which will cut down on installation complexity. Wilfert Ok. Thanks. Im planning the same thing myself so doing some research to. Eivind Quote Link to comment Share on other sites More sharing options...
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