Diesel vs Petrol

ses6jwg

mitchaa wrote: »

They are not solely associated with diesels though

Most cars nowadays will have DMF's to help with engine vibration dampening. Petrol cars have turbos too.

In terms of performance, petrol wins hands down everytime. Petrols are top range of every car manufacturer.

A golf gti will go from 0-100mph a lot faster than its TDI counterpart, the same for any given turbo petrol vs turbo diesel. TDI's have torque but over such a small rev range.

But the torque produced low down in a diesel makes the DMF more likely to fail if not driven correctly.

You might be right but how often does anyone do 0-100?

If I ever have a little "play" with other drivers its usually 30-80 coming off a roundabout.

The diesel would win every time, especially if remapped.

Rolandtheroadie

mitchaa wrote: »

They are not solely associated with diesels though

Most cars nowadays will have DMF's to help with engine vibration dampening. Petrol cars have turbos too.

In terms of performance, petrol wins hands down everytime. Petrols are top range of every car manufacturer.

A golf gti will go from 0-100mph a lot faster than its TDI counterpart, the same for any given turbo petrol vs turbo diesel. TDI's have torque but over such a small rev range.

2.0 ghia-x mondeo petrol 0-60 9.6 sec. 2.0 tdci ghia-x (6) diesel 9.5 sec. Seems the only 2 litre petrol mondeo thats got better 0-60 times than it's diesel equivelent is the automatic ones.

mitchaa

0002yasbE wrote: »

If you mean screaming away from lights and setting 0-60 times for manufacturers to boast about you may be right.

But.

If you mean feeling quicker in everyday driving I think turbodiesels would get the vote from most everyday drivers. The considerable extra torque makes driving them a better experience in 'normal life'.

For normal everyday driving, regular motorway journeys etc TDI's are great. Good overtaking abilities with good mpg.

However, drop a petrol turbo down a couple of gears, put the accelerator down to red line revs and the TDI wouldn't see which way the petrol went.

An Audi RS4 gets to 100mph in around 10secs. An Audi A4 3.0tdi around 17secs.

I can say the same for all manufacturers really, the petrol version will always win if in an all out acceleration race. You dont see any ferraris/Lamborghinis/Aston Martins etc running from the black pump do you

But your point is relevant, for day to day driving and not racing around like a boy racer then the low rev torque bands make TDI's easier to drive.

mitchaa

scotsman4th wrote: »

2.0 ghia-x mondeo petrol 0-60 9.6 sec. 2.0 tdci ghia-x (6) diesel 9.5 sec. Seems the only 2 litre petrol mondeo thats got better 0-60 times than it's diesel equivelent is the automatic ones.

You should be using the mondeo ST220 then though if you are comparing TD.

TD over petrol wins hands down.
TD over Turbo petrol though and it's another story.

mitchaa

ses6jwg wrote: »

But the torque produced low down in a diesel makes the DMF more likely to fail if not driven correctly.

You might be right but how often does anyone do 0-100?

If I ever have a little "play" with other drivers its usually 30-80 coming off a roundabout.

The diesel would win every time, especially if remapped.

Not if the turbo petrol driver dropped a couple of gears it wouldn't.Turbo petrol cars can be remapped too.

I had a Leon Cupra R tuned to 360bhp a couple of years ago, there were not many cars on the road that could keep with it but with being FWD it was difficult to live with especially in damp and wet conditions, wheel spin in 4th and 5th gear.
I have an Audi TT-S now and that has been mapped to around 330bhp. The car will do 60 in 4.5 and 100 in 10 and hit 175mph if I asked it too.

A TDI car may well catch me out if I plant the foot in 6th at 50mph, but if i dropped it into 3rd where it should be then it would be a little dot in the rear view mirror.

It all depends on how you drive the cars, it's easy to catch someone in the wrong gear. My wife has a mini cooper just now but we are thinking about trading it in for a BMW 123d soon. 205bhp and 45mpg is very appealing

mitchaa

0002yasbE wrote: »

I agree with what you say and the fact is that most people spend most of their time driving from A to B and want it to be as simple and effoertless as possible. This is where diesels score heavily and is why 'ordinary drivers' are often surprised when they first drive a diesel.

I'd agree with that and the point I was trying to make

AdrianHi

Complex question.
Depends on the specific cars your considering and how you will use them.
Some cars the petrol and diesel services prices are very similar. With other cars the diesel costs a lot more to service - Mazda need to do something about this their diesels are way too expensive to service wiping out most of the fuel savings.
In addition to the above only the smallest diesel engines avoid having to have a diesel particulate filter (DPF) which then makes them unsuitable for cars only used on short trips. The DPF never gets the chance to burn off the soot "naturally" with hot exhaust gases or perform a regeneration cycle where in some cases fuel mixture is changed to increase exhaust gas temperature and burn the soot off. For either of these things to happen the car needs to be driven for half an hour of more.
Garages will charge you £100s to clean them out if they get clogged.

Rolandtheroadie

We've went from comparing a turbo diesel to its petrol equivalent to trying to compare it to a turbo charged petrol.
So TD v's Turbo charged petrol.
If I kick the !!!! out my 2.0 TDCI Mondeo, I get around 43 MPH. How does that compare to kicking the !!!! out a turbo charged petrol? Whats cheaper to run? And buy? and service?

Rallydriver

I think this subject came to a reasonable conclusion in the last thread on the subject. Link is here, I don't think its worth retyping.

http://forums.moneysavingexpert.com/showthread.html?t=2086131&page=3&highlight=diesel

goldspanners

Rallydriver wrote: »

I think this subject came to a reasonable conclusion in the last thread on the subject. Link is here, I don't think its worth retyping.

http://forums.moneysavingexpert.com/showthread.html?t=2086131&page=3&highlight=diesel

and on this thread aswell.