If the carry flag is set, then the knock sensor value was higher than the threshold, and we donât have knock, so we skip beyond this section. This makes knock detection more sensitive at lower rpm, and (relatively speaking) less sensitive at medium to higher rpm. Recall from the start of this boost related section that f0 was cleared if the 2Ch counter was 0 (when ANDed with 56). Hereâs the relevant knock routine code again: First, the value from 7Ah is loaded into both r0 and the accumulator. Next we see yet another of the rpm constants being used: 4Ch. The first section is where detection actually happens. bootmod3 allows end users to unleash the full performance potential of their BMW while doing so as the factory intended by programming the factory engine control unit (ECU/DME) over the OBD diagnostic port. Cloud based solution with a web based interface and mobile apps for iOS and Android. Whatâs weird is the way the value is used in he following code: So we take the value 128, swap it, giving 8, complement that, giving 247 (which we store in r2 for later), then OR that with 240, which results in no change to 247, then incrememt it to 248. The call to 0x798, weâve seen before: that routine was used to decrement the timing delay value in 73h if the specified counter rolled over. If we donât detect it, then something is wrong with the circuit. 2013 Jun 24;12:60. doi: 10.1186/1475-2859-12-60. In the ADC routine, near the end of the cycle, we read the knock value into 46h. This is because 46h will be used a little later to calculate a new knock threshold for this cylinder, and that calulation actually takes account of whether knock was detected or not. Download bootmod3 for Android to bootmod3 is the First and most widely adopted flash tuning platform for the BMW F and G series vehicles. Note, we donât check if 73h already had a timing delay value. The effect of these 2 checks is that weâll jump to 0xDBA if 58h was less than 8 (i.e. The final 2 instructions at 0xD1C just restore the lower nibble of 47h back to where it was (since we rotated it into the upper half for our multiplcation routine). Next we add r2 to 73h, which you should recall is the timing delay value for the cylinder weâre analyzing right now (r0 still points to 73h from the rotation loop at 0xD34). But this value in 73h has nothing to do with Cylinder N; itâs from a previous cycle, which weâll ignore for now! The next routine is called twice in succession, and its definition can be seen just after the ret instruction. What makes it different is that the multiplier is a fraction! The values that go in the blink code location (33h) are binary coded decimal or BCD. You could just pull timing on all cylinders, but that would reduce power more than necessary. Up until bootmod3 came into existence there were two popular ways of tuning the BMW F series, using a piggyback device to just add boost, and the other, by sending your ECU (DME) out for a one time flash to a tuner of your choice. So the next section of code (before 0xDBA will only run if 58h was exactly 8. Itâs not a hugely significant step at this point, so donât worry about this flag until later. This coeffecient is another of the rpm constants and itâs effectively 1.5 (low rpm), 1.25 (medium rpm), or 1 (high rpm). So, weâll calculate any necessary delay, and then make sure that that delay is applied to the ignition signal after 3 more ignition events. Over the past year, I have driven my 2015 BMW M4 with the BM3 Stage 1 93 map in many different environments and have really put it to the test. Before reading this section, you should have a pretty good idea of what knock is, and how itâs mitigated by reducing spark advance (aka âtimingâ), and ideally you should be reasonably familiar with the KLRâs knock sensor hardware. Recall from the hardware section that the knock sensorâs output is integrated and then fed to the ADC. I decided to do some logging and was getting tons of knock detections during city driving. Without a doubt, knock is easily the biggest killer of any performance engine yet it’s still largely ignored or misunderstood by a large percentage of tuners. $595.00 USD. restore timing pulled from a previous cylinder, if appropriate. Remember, we set it to 9 earlier if knock was detected; otherwise it was zero. In order to achive this, thereâs a lot of copying and rotating of values in various parts of the code, and it can be pretty confusing to try to decipher all that while youâre trying to understand the calculations at the same time. 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