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最近網上除了瘋傳量子 formula 三舊鐵之外，仲有既就係俾 Tesla 用既底擔戒子 + OBD2 電腦 Package。裝左套戒子，聲稱掟灣會順左，架車冇咁浪，regen 冇咁 chok，仲會慳電左？究竟係咪真係咁神奇？今日同大家初步了解下。
其實底擔戒子呢樣野唔係新野，日本一早就有，而且理論好清楚。現今車廠為左令 Production 快啲，都會實淺機械化。機械法有個缺點，就係因為會有誤差，所以會預大啲羅絲位，等機器可以容易裝嵌。而因為咁，所以車架同底擔之間會出現虛位，令到架車冇咁扎實，過灣或行車都會有浪既感覺。呢個問題亦不是 Tesla 獨有，而係幾乎所有車都會有既問題。而底擔戒子，就係用飛機鋁，去填補返呢啲虛位。日本 Spoon 其實有出過呢種 product，叫 Rigid Collar。
The way the Rigid Collar works is simple. Bolt holes through the chassis panel and sub frame are normally too big as they were designed for ease of production in the factory.
When the car leaves the factory, everything is new and tight and the chassis hardly moves. After a while, the bolts become slightly looser and movement between the panels begins.This is why an older vehicle fitted with new bushes, Shocks and springs, still doesn’t behave like a new car.
The Rigid Collar is an aluminium washer (as per photo) with a square outside Taper to increase adhesion on the Thinner flange portion in the middle. This fits between the moving panels and with a properly sized bolt (and Bolt Hole as part of the Rigid Collar) is crushed into place when tightened, joining the two panels and stopping movement forever.
Rigid Collars cure chassis movement, improve handling, reduce road noise, reduce vibration, improve braking and make the car safer in an accident.
呢度亦有段片去介紹底擔戒子既原理︰
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咁 Regen 冇咁 chok，慳左電又係點解？呢個就係 OBD2 舊 module 既作用。以下係我以我最大努力去 rephrase 老闆講既野︰
電路板就係令到 Regeneration break既 frequency synchronize, 會令到即使開左 standard regen 都好似開左 low 咁, 但同時會慳電左, 老闆指有10%以上。
大致上，好似係摩打既充電其實係好似 wave 咁。而呢舊 OBD2 module 就係可以令到充電既 wave 同摩打既 wave in sync 返啲，令到成件事順啲同 efficient 啲。
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當然，講就天下無敵，但實際效果如何呢？
其實我之前已試過搵我既 Model S 同另一架裝左套 package 既 Model S 做過比較。分別係好明顯，regen 亦真係冇咁 chok。但事後先知對方架車唔係 air suspension，同我條呔又唔同，所以好難講個分別係因為套 package。後來亦試過搵我架 P100D Model S 同架裝左既 P90D Model S 比較，掟灣係真係明顯穩左，不過對方係 21 吋我係 19 吋，始終 variable 太多，我好難下定論。
而我都心郁郁，裝左套野喺架 Model X 度。裝完喺 Model X 後，老實講，除左 regen，分別係 feel 到，但個 difference 係冇 Model S 咁明顯…始終架車高身啲，分別冇 Model S 咁大。喺裝左 package 既 Model S 上，我明顯 feel 到掟灣係順左，但喺 Model X 我 feel 唔到。我遲下會從多角度去做實驗比較係咪慳電左，但暫時我對慳電係抱懷疑態度。
如果你問我，套野值唔值得裝，我依家係抱中立態度。Model S 既分別幾明顯，我覺得唔係心理作用，因為好似十個試完車，九個都會想裝，但要更多實驗去証明。而 Model X，有車友同我反映好好多，但我覺得只係好左少少，亦有車友 feel 到個分別，但同我一樣覺得分別唔會大到想俾錢裝，遲下我會試下坐喺全車最浪既最後排去感受下有冇大分別。
如果大家有興趣，可以搵我或者其他裝左既人去試車自己感受下，會好過上網聽人講。你如果試到大分別，就去裝。試完覺得無料到，就唔好裝。從來都係咁簡單。
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