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Discussion Starter · #1 ·
Hi, imagine you are at a standstill at some lights with a straight road ahead whilst in your 1.7cdti 125bhp corsa... you want to get to 100mph as fast you possibly can...

At what rpm should you change up?..

I have a tendancy of revvin it high when racing cos i was used to a petrol before.. but as i understand this isnt the best use of turbo etc..
 

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not the best idea for diesels, for the best speed you want to change when your torque is at its highest, for that you need to put it on a rolling road to find the optimum rpm to change gear
 

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not the best idea for diesels, for the best speed you want to change when your torque is at its highest, for that you need to put it on a rolling road to find the optimum rpm to change gear
Thats it you want to keep the engine always in the peak torque band. Keep it between 2-3k and you should be fine
 

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Discussion Starter · #4 ·
Got these figures from wikipedia.. what exactly are they telling me? That I should change at 4000 rpm?

Power - 125 PS (92 kW; 123 hp) at 4,000 rpm
Torque - 280 N·m (207 lb·ft) at 2,300 rpm
 

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no, that basically says your peak torque is at 2300rpm, anything after that and your torque reduces. your peak power (BHP) is at 4000rpm
 

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Try and keep the engine around 2-2500 rpm then you will get the full torque. Also the MPG will go up. Diesels love torque as they are lazy where as petrol love revs. You can rev a diesel but will get no gain. To put it into context at 2,300rpm your car is making more torque than a stock Corsa vxr at full boost
 
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