Lab / Car Performance
Slipstream
Verification of Slipstream Effect
| 2020-07-18 | Ver.1.61 vs 1.57 has been added. |
Comparison between Ver.1.61 and 1.57
Summary
| Effective area | : | Narrowed (Time Gap : about +1.5 sec → +0.8 sec) |
| Strength of Drag Reduction | : | Increased |
Test Conditions and Cars
A faster car chased a slower car in front from about 2.0 seconds behind.
| Car in Front | : | Atenza Gr.3 |
| Car behind | : | McLaren F1 GTR-BMW '95 |
Details of the test condtions are here.
Test Results
| Fig. 1-1 | Effect of Slipstream at Max. Speed Ver.1.61 vs Ver.1.57 |
Regarding Ver.1.61, the effect of slipstream came out when a time gap from the preceding car was about +0.7 to 0.8 seconds. In Ver.1.57, it was about +1.4 to 1.5 seconds. An effective area of slipstream is about half that of the previous version.
On the other hand, the strength of drag reduction increased. Under these test conditions, the acceleration in slipstream increased by more than 50%.
Overall, Ver.1.57 can overtake a car in front earlier than Ver.1.61. Therefore, it can be said that the effect of slipstream has basically weakened by this update.
Details of Test Conditions
| Table 1-1 | Test Conditions |
| App. Ver. | : | 1.61 (2020-07-16), 1.57 (2020-04-23) |
| Track | : | Special Stage Route X / Back Straight |
| Time | : | 15:20 / Fine Weather |
| BoP | : | Ver.1.57 BoP applied to the both versions |
| Setting | : | Disable |
| Tyres | : | Racing Hard |
| Tyre Wear | : | OFF |
| Fuel Consumption | : | OFF |
| TCS | : | OFF |
| Transmission | : | AT |
| Starting Point Conditions | : | Max. Speed / Throttle 100% |
| Sampling Time | : | 0.033 s (29.97 fps) |
| Table 1-2 | Test Car Performance (Ver.1.57 BoP) |
| Car | Performance Points | |
|---|---|---|
| Max. Speed | Accerelation | |
| McLaren F1 GTR | 7.0 | 5.6 |
| Mazda Atenza Gr.3 | 6.2 | 5.1 |
Ver.1.57 vs. 1.56
Effect of Slipstream at Max. Speed
The strength of drag reduction has been reduced, increasing time to reach maximum speed. However, speed gain and effective area of slipstream do not seem to change.
*Note that the speed gains were the same because vehicle speeds reached the RPM limit of the test car in both versions.
Car in Front : Atenza Gr.3
Car behind : McLaren F1
A faster car (McLaren F1) chased a slower car in front (Atenza) from about 2.5 seconds behind.
| Fig. 2-1 | Effect of Slipstream at Max. Speed Ver.1.56 |
| Fig. 2-2 | Effect of Slipstream at Max. Speed Ver.1.57 |
| Table 1 | Test Cars |
| Car | Performance Points | |
|---|---|---|
| Max. Speed | Accerelation | |
| McLaren F1 GTR | 7.0 | 5.6 |
| Mazda Atenza Gr.3 | 6.2 | 5.1 |
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