What is the best RPM to shift up or down in a car.?

[sp4chamara]

mcnla..

Car eke gear shift karanna oni RPM eka mokadda..Normal drive karanakota...Ape car eke 2nd gear eka poddak hirawenwa...3rd eke idan 2nd ekata enakota....but 10kmph & 1000-2000 wage RPM ekedi nam 2nd ekata gear shift wenawa lassanata...!!

 

[speedmalli]

redline

 

[Yahapala_Naya]

Car 1 peak torque rpm ekata tikak udin shift karama rpm loss eka adui.
Nikan pare yanawanam engine eka stall wenne nathiwa shift karagaththama hari(3000] wage weddi shift karala[petrol car ekak nam]).