Biting back wink
I find Diesel Cars figures very optomistc.
Bhp is the best indicator of how quick a car will be "Through the gears" as bhp is torque X rpm / 5250
Torque tells you how much shove you have available at the engine, bhp tells you how well you can use this torque with gearing.
Extreme example.. (These are pretty accurate)
Diesel, max torque 225lbft and 150bhp@4000rpm
F1 car, max torque 200lbft and 800bhp@18000rpm
The diesel has more torque than an F1 car but the F1 cars ability to rev allows it to run lower gearing for the same speed. An F1 car in a top gear that allows 200mph will be geared about the same as a road going diesels 2nd gear.
Take away aerodynamics and the F1 car would accelerate at the same rate at 200mph as the diesel would in 2nd gear at say 30mph.
So back to 30-70mph dash in the 156. A 155bhp version recorded 7.8 seconds and according to Diesel Car mag a heavier 140bhp version does it in 7.1
A bit Suspect that.
I'll say again I'm in no way anti-diesel but I do deal with torque/horsepower/gearing daily so understand how it works.
Modern TDi's feel very strong on the road as maximum torque is developed in the normal drivng range where a revvy vvt petrol engines have to be worked hard.
It gets more complicated when you start to look at torque curves, a 2.0TS has very little torque below 3000rpm so a diesel feels loads stronger when driving normally. Drive a Skoda RS/Leon Cupra and maximum torque is available from 1900rpm to 5500rpm and it will hold power to 6250rpm so it feels very strong at all speeds.
I had a 2.5V6 Mondeo a couple of years back and my Father-in-Law has a TDCi Mondeo. The V6 easily beats the TDCi in all performance figures except in gear flexibility, but the TDCi "Feels" the strongest on the road due to its instant low down pull.
WhatCar said the 115bhp Focus TDCi felt quicker on the road than the 170bhp Focus ST170 but get them on a track or road race and obviously the TDCi would be left for dead.