Overdrive (OD) ni gia katika mfumo wa gari ambayo huifanya gari kuwa katika spidi kubwa huku mzunguko wa injini ukiwa mdogo. Kwa lugha rahisi, OD ni gia ya mwisho inayokupa mwendokasi. OD hukupa mwendo wa kasi, uliotulia lakini kwa mzunguko mdogo wa injini (revolutions per minute-rpm). Hii hukuwezesha kuwa na matumizi madogo ya mafuta pengine kwa kasi zaidi.
Overdrive ni kama gia ya ziada inayokupa mizunguko mingi ya driving shaft kwa mizunguko michache ya injini yako. Unapaswa kuitumia ukiwa unatembea mwendo mkubwa. Faida zake utatumia mafuta kidogo, maana gari inakwenda kasi kwa mizunguko michache ya injini.
Mfano katika gari ya kawaida yaani 180km/h ili ufikishe spidi 120 basi RPM inaweza ikawa 4000rpm katika barabara ya tambarare. Lakini ukiweka overdrive unaweza kutembea spidi hiyo hiyo kwa rpm 2000 katika barabara ya tambarare.
Utatambuaje kama Overdreive (OD) ipo on au off?
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