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BMW 3-Series (E90 E92) Forum
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Anyone try Race Chip?
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06-09-2015, 01:02 PM | #45 | |
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06-09-2015, 05:13 PM | #46 |
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06-10-2015, 06:17 AM | #47 | |
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07-05-2015, 11:11 AM | #49 |
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12-10-2015, 10:53 AM | #51 | |
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Here's your answer. See the "AC" signal on the DC? Filtering is on the DAC. |
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12-12-2015, 12:48 AM | #52 | |
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03-20-2016, 11:52 PM | #53 | |
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Injection pulses are typically of couple (1-4) of ms of duration. Even if you are sampling with 1ms rate (1kHz) frequency (which is nothing even for the slowest chips - they can sample with a MHz frequency), you still have time for like thousand instructions for processing of a signal. Usually these chips have multiple maps (I've read somewhere that RaceChip has 1k maps each of them containing 32 points taking 32kB Flash memory for it) and these maps are used almost certainly statically with only dynamics being the gradient of the signal, i.e. there is no complex signal-processing as PID controller emulation or similar. So chip is doing only couple of things: 1) sampling and ADC conversion 2) detection of the mode: comparing the value with the thresholds and calculating gradient of the signal using couple of points 3) based on the mode look-up table to extract newly applied value of the signal from the map 4) numerical interpolation between two values from the table 5) eventually applying some offset and correction factor to it (simple if and add/sub operations) This all can be easily done in 1-10us, so again no problem for any mcu. So to conclude, all this talk about new faster processors and quicker map updates in real time is just marketing BS. P.S. For example Racechip One and Racechip Pro 2 are 100% identical PCB's with all the same components, the only difference been that Racechip Pro 2 has exactly same type (ST8M) of 24MHz mcu instead of 16 MHz mcu that Racechip One has (not 8MHz as they say in their advertisements). Racechip Ultimate has faster ARM Cortex M3, but uses exactly the same maps (32kB) so no difference there at all. |
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03-22-2016, 06:11 AM | #54 | ||
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04-13-2016, 05:58 PM | #55 | |
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STM32F102C6 for Racechip Ultimate) has DAC and in all of them the generation of analog signal is done in the same way - 16b timer PWM output fed through low-pass filter. Due to the need to minimize the ripple from PWM, this is limited by the time constant of the low-pass filter which is couple of ms. Therefore, actual speed of ADC and calculation/look-up in the chip has no impact at all. They could have employed the chip with internal DAC or external fast DAC (these components cost 1-2$ only), but they've opted out for the slowest solution. |
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07-09-2018, 07:55 PM | #56 |
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Drives: 2011 BMW 335d, 2011 BMW M3 ZCP
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I hate to revive a thread this old, but I am looking at the Racechip site and they still have three different boxes with new names and you can control them with an app. Has anyone tried the “new” version of Racechip?
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07-10-2018, 10:04 AM | #57 |
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Get a real tune. AArodriguez is a short roadtrip away in GA and can even remote tune. I am just not a fan of the piggyback "tuners". If you prefer piggyback, just get a JBD tuner used for $150 and call it a day.
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07-13-2018, 04:06 PM | #58 | |
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