Driving technique - Diesel v. Petrol ...
Driving technique - Diesel v. Petrol ...
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keeplftxcpt2pass

Original Poster:

93 posts

203 months

Sunday 12th June 2011
quotequote all
To the PH "brains trust", for arguments sake let's say a Focus Diesel v. Focus Petrol. When performance driving what is the difference? I understand it has something to do with torque but I am not clear on that.

Tallbut Buxomly

12,254 posts

245 months

Sunday 12th June 2011
quotequote all
Very simple a diesel produces a ton of torque and power in a very short band whereas a petrol produces it in a much wider band.

Ie my a4 diesel pulls strongest and hardest between roughly 1.5-2k rpm through 3-3.5k rpm. However i also have a toyota petrol which pulls all the way from 1.5k rpm round to 7.5k rpm iirc as i dont drive it very often.

It is also all very dependant on whether the engine is naturally aspirated or has a turbo and the engine mapping which assigns how the power is released from the engine.

My a4 i can simply get on the motorway stick it in 5th and cruise and even if i slow to say 40-50mph i have no need to change gear just press the pedal and the torque happily pulls me back to cruise speed. In the toyota i would have to change down as the engine simply doesnt have enough torque to pull in such a high gear from so low in the rev range.

keeplftxcpt2pass

Original Poster:

93 posts

203 months

Sunday 12th June 2011
quotequote all
Great explanation, now I get it! Thank you