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builds:mcqueen
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builds:mcqueen [2016/11/24 13:20] thejerm [Detachable Trailer] |
builds:mcqueen [2016/11/24 20:55] (current) thejerm |
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| {{:builds:mcqueen:pforile.jpg?direct&600|}}\\ | {{:builds:mcqueen:pforile.jpg?direct&600|}}\\ | ||
| - | //"LiPo turned Baltimore's car - a good vehicle that was designed to run just behind the speed leaders - into an absolute, adrenaline-charged beast that could now out-pull and out-run nearly every car since the beginning of the fused era."// | + | //"LiPo turned Baltimore's car - a good vehicle that was designed to run just behind the speed leaders - into an adrenaline-charged beast that could now out-pull and out-run nearly every car since the beginning of the fused era."// |
| Built By: [[http://baltimorehackerspace.com/|Baltimore Burners]]\\ | Built By: [[http://baltimorehackerspace.com/|Baltimore Burners]]\\ | ||
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| Qualifying third in its debut race weekend was quite inspiring, and Baltimore knew they had a winning formula on their hands. When the 2016 rules came out and allowed the use of LiPo batteries, the Baltimore team bought 8x 5Ah 14.4V LiPo battery packs to replace one of their LiFe packs which had been driven negative during some testing. Since an 8S LiFe can use a 60A fuse but an 8s LiPo can only use 50A, the ECU switched its current limits out based on the voltage of the battery pack at controller boot. | Qualifying third in its debut race weekend was quite inspiring, and Baltimore knew they had a winning formula on their hands. When the 2016 rules came out and allowed the use of LiPo batteries, the Baltimore team bought 8x 5Ah 14.4V LiPo battery packs to replace one of their LiFe packs which had been driven negative during some testing. Since an 8S LiFe can use a 60A fuse but an 8s LiPo can only use 50A, the ECU switched its current limits out based on the voltage of the battery pack at controller boot. | ||
| - | Despite the reduced current limit, LiPo turned Baltimore's car - a good vehicle that was designed to run just behind the speed leaders - into an absolute, adrenaline-charged beast that could now out-pull and out-run nearly every car since the beginning of the fused era. | + | Despite the reduced current limit, LiPo turned Baltimore's car - a good vehicle that was designed to run just behind the speed leaders - into an adrenaline-charged beast that could now out-pull and out-run nearly every car since the beginning of the fused era. |
| The switch to LiPo was a clear, immediate, unexpected, and unbeatable performance gain for this vehicle. Though the current limit went down 17%, the voltage increased by nearly 13% so net power out of the battery could remain fairly unchanged. Additionally, battery impedance went down on the LiPo pack so the voltage did not sag under load. This meant that net power to the motor actually increased substantially under heavy acceleration. The creation of McQueen's first LiPo pack was paired with a change in system wiring from 10AWG to 6AWG, which also contributed to the decreased system impedance and increased power. Finally, the higher voltage of LiPo coupled with its lower impedance meant that the car could now hit 23mph on a fully charged LiPo pack, much higher than the 19mph that it was capable of on LiFes. Remember what your KV rating means, folks! | The switch to LiPo was a clear, immediate, unexpected, and unbeatable performance gain for this vehicle. Though the current limit went down 17%, the voltage increased by nearly 13% so net power out of the battery could remain fairly unchanged. Additionally, battery impedance went down on the LiPo pack so the voltage did not sag under load. This meant that net power to the motor actually increased substantially under heavy acceleration. The creation of McQueen's first LiPo pack was paired with a change in system wiring from 10AWG to 6AWG, which also contributed to the decreased system impedance and increased power. Finally, the higher voltage of LiPo coupled with its lower impedance meant that the car could now hit 23mph on a fully charged LiPo pack, much higher than the 19mph that it was capable of on LiFes. Remember what your KV rating means, folks! | ||
builds/mcqueen.txt ยท Last modified: 2016/11/24 20:55 by thejerm
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