01-15-2013, 02:06 AM | #1 |
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Chipbox for M5
Has anyone heard or tried this ?
http://www.swiss-chiptech.com/chiptuning-box.html For F10 M5, it claims to increase performance to 615 hp & 750Nm. One good thing (if true) is that you can unplug it & go back to stock setting when going to BMW for service. |
01-15-2013, 10:47 AM | #2 | |
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The power box simply alters the signals that some sensors (on a common rail diesel it's the fuel pressure sensor) give to the ECU. Fooling the ECU to believe that it's running a low fuel pressure and increasing fuel pressure to increase power. Say that the (diesel) fuel pressure is supposed to be 1800bar under normal conditions. The fuel pressure sensor gives a certain value/feedback to the ECU when the pressure is 1800bar. By bypassing the signal via the power box and altering that signal the ECU believes the fuel pressure is just 1500bar and increases the signal to the fuel pump and gets the fuel pressure higher. This then leads to the ECU receiving the correct fuel pressure feedback for 1800bar, but the real fuel pressure is 2100bar...!!! This is probably also the same method applied to the M5. Most likely both fuel and boost pressure signals are altered to fool the ECU into believing that it's running low boost and fuel pressure... The power boxes are really nothing more than a added resistance in the circuit to some of the sensors... |
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01-15-2013, 10:11 PM | #3 | |
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The other questions are : - does it actually produce such performance gain ? - any drawbacks for using this kind of chipbox ? |
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01-16-2013, 10:56 AM | #4 | |
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Performance gains are possible as long as boost and fuel is higher, but these powerboxes have often been over advertised. The drawbacks are obviously that the ECU are still operating at it's std. maps and believes that the boost pressure still is std. The ECU maps are not altered to advance/retard ignition etc to the higher boost and fuel pressure. Meaning that the map is still for a 560HP engine setup with a given boost pressure and not remapped for higher boost and HP. This can lead to problems with lean/rich mixture, exhaust temperatures etc. |
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01-16-2013, 11:17 AM | #5 | |
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You're correct BMW can detect changes in signals, temperatures, revs, altitude etc and if they don't correlated in a reasonable way they likely will log an fault . Not all faults are stored in a visible fashion so BMW can also retrieve hidden faults the aftermarket code readers/erasers won't see. That's why some of the code readers/erasers will flood the ECU with false/benign codes (such as exhaust flap) to (hope) erase any other codes In short if it would be that easy to come up with a simple piggy back tune (or any other) the bigger tuners would have done so already. As now has been demonstrated over and over again, there's no magic 8 ball to tune the M5 and BMW will certainly make sure to keep tuners at bay and introduce new and improved measures. The honest tuners providing tunes today will tell you that they can modify the ECU/maps but it will also void your engine / drive train warranty. It all depends how desperate you are and how much of a risk you're willing to take.
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01-18-2013, 04:24 PM | #7 |
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May be dumb question. Buy new OEM ECU, tune it, replace your OEM with it. Warranty time, swap ECU?
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01-18-2013, 05:04 PM | #8 | |
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Replacing the DME is not an exercise you want to try at home
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21 F97 X3MC Toronto Red/Black and more | 18 F80 M3 Tanzanite Blue/Amaro/CCB and more
15 F10 M5 Individual / Brilliant White / Extended/Full Cohiba Brown (Exec/Driver/B&O/20") / A few Euro add-ons / Stealth K40 / Upgraded B&O / ///M Performance Carbon Interior Trim / IND / Akrapovic Evolution Exhaust / HRE S107 |
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01-19-2013, 04:50 PM | #9 |
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I used to have a GM vehicle, and swapping out the PCM was no problem. Could update VIN, mileage, etc through tuner. Obviously much more complex beast here.
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