Throttle cut
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Definition
Throttle cut is any condition which causes the ECU to reduce the throttle pedal angle, even if the actual accelerator pedal potentiometer is at WOT.
The two main causes of throttle cut are
- ESP activity (a.k.a. traction control)
- The ECU senses that one or more wheels are losing traction. It does this if ESP is enabled, the ABS wheel sensors show a large discrepancy in wheel speed.
- Boost deviation
- Actual boost pressure far exceeds desired boost pressure by around 200-230mbar (3-3.3 psi). The ECU will only restore throttle angle once actual boost pressure falls to at or below the desired boost pressure.
Examples
Throttlecut.csv shows a 3rd gear run where the ECU cuts throttle.
| TIME | RPM | ThrottlePlateAngle | BoostPressureDesired | BoostPressureActual | Deviation |
|---|---|---|---|---|---|
| 497575 | 4025.75 | 99.6078431372549 | 2327.109375 | 2490.625 | |
| 497645 | 4046.75 | 100 | 2315.1953125 | 2508.90625 | 193.7 |
| 497716 | 4114 | 100 | 2302.1484375 | 2503.0859375 | 200.9 |
| 497786 | 4151.5 | 99.6078431372549 | 2271.1328125 | 2508.2421875 | 237.1 |
| 497856 | 4200.5 | 45.8823529411765 | 2263.1640625 | 2488.203125 | 225.0 |
| 497926 | 4230 | 43.921568627451 | 2248.3984375 | 2457.65625 |
| TIME | RPM | ThrottlePlateAngle | BoostPressureDesired | BoostPressureActual | Deviation |
|---|---|---|---|---|---|
| 499748 | 5183 | 48.2352941176471 | 2200.546875 | 2222.8515625 | |
| 499819 | 5211 | 48.2352941176471 | 2208.0078125 | 2226.5625 | 18.6 |
| 499889 | 5246.5 | 48.2352941176471 | 2216.2109375 | 2217.34375 | 1.1 |
| 499959 | 5294.5 | 77.6470588235294 | 2220.234375 | 2194.8046875 | -25.4 |
| 500029 | 5319 | 100 | 2227.1875 | 2166.2109375 |