how do you drive a TDCi?

The centre for more serious off topic questions, light hearted banter and friendly chat.
User avatar
bluechair84
Posts: 4046
Joined: Wed Oct 03, 2007 15:03 pm
Contact:

Re: how do you drive a TDCi?

Postby bluechair84 » Wed Apr 11, 2012 13:36 pm

Well, I've done the service and over 500 miles I've filled up twice and got 49mph and 53 mpg... I might have to expect that this is the car's capability. I'd hoped for a bit more, but it's still slightly cheaper per mile than the 407 was, tax is 145 pounds less and insurance is lower so all in all it's much better.

User avatar
mrmonkfinger
Posts: 1431
Joined: Fri Sep 02, 2011 13:44 pm

Re: how do you drive a TDCi?

Postby mrmonkfinger » Thu Apr 12, 2012 08:07 am

YeehaaMcgee wrote:Ah. There's your answer.
Pug diesel engines are just in a different class.


Just so as you know, the (05-11) Focus 1.6 and 2.0 diesels use an engine jointly developed on by Ford and Peugeot. The 1.8 used an previous generation Ford block, I'm not sure its as good as the 1.6 or 2.0. I have no idea about the current Focus. http://en.wikipedia.org/wiki/Ford_DLD_engine

bluechair -

I get a nose under 50mpg doing my twice weekly 100mile+ motorway/a-road/country lane run at up to about 75mph, and that's in a 2006 2.0 estate. I use cruise control a lot. If I dawdle along at 60mph it gets about 65mpg. That's GPS speedo and pump receipts, btw, not trip computer. My speedo and trip computer both overread by 3-4%.

In honesty, I'd expect a bit better out of the 1.6. :?

User avatar
bluechair84
Posts: 4046
Joined: Wed Oct 03, 2007 15:03 pm
Contact:

Re: how do you drive a TDCi?

Postby bluechair84 » Thu Apr 12, 2012 09:04 am

The one thing I can point to is it's the 90bhp engine, not the 110bhp. It might just be a bit too gutless to manage it's weight.

User avatar
.blitz
Posts: 6248
Joined: Tue Sep 02, 2008 10:22 am

Re: how do you drive a TDCi?

Postby .blitz » Thu Apr 12, 2012 10:12 am

My mate has a 90bhp Eco Focus, bought on the strength of the 115bhp Ti-VCT I used to own. The Eco has a useful amount of low rpm torque but elsewhere it feels a bit subdued, like driving the with the air con on.

User avatar
bluechair84
Posts: 4046
Joined: Wed Oct 03, 2007 15:03 pm
Contact:

Re: how do you drive a TDCi?

Postby bluechair84 » Thu Apr 12, 2012 10:17 am

I wonder why the 90bhp eco will get higher mpg than my 90bhp (other than it being an estate). They do have eco tyres which I wouldn't want to go for, I've heard bad things regarding braking distances.

User avatar
Thewaylander
Posts: 8689
Joined: Mon Mar 03, 2008 18:05 pm

Re: how do you drive a TDCi?

Postby Thewaylander » Thu Apr 12, 2012 12:07 pm

Most important if your trip is less than 10 miles your diesel engine wont even get warm, and then there econemy is't very good.

Diesels are slow slow to warm up in comparison to a petrol engine so for short journeys an effiecient petrol is normally a better option.

And as to pug engines, who cares when the cars are made of tin foil and bits fall off them :p which i have seen :s

User avatar
YeehaaMcgee
Posts: 5955
Joined: Sun Feb 26, 2012 13:30 pm

Re: how do you drive a TDCi?

Postby YeehaaMcgee » Thu Apr 12, 2012 12:13 pm

Oh, are we back on the warmup malarkey again?

User avatar
mrmonkfinger
Posts: 1431
Joined: Fri Sep 02, 2011 13:44 pm

Re: how do you drive a TDCi?

Postby mrmonkfinger » Thu Apr 12, 2012 12:37 pm

YeehaaMcgee wrote:Oh, are we back on the warmup malarkey again?


They do take sodding ages to warm up.

More of a pain in winter... If you're one of those without a magic electrical windscreen.

User avatar
YeehaaMcgee
Posts: 5955
Joined: Sun Feb 26, 2012 13:30 pm

Re: how do you drive a TDCi?

Postby YeehaaMcgee » Thu Apr 12, 2012 12:49 pm

mrmonkfinger wrote:
YeehaaMcgee wrote:Oh, are we back on the warmup malarkey again?


They do take sodding ages to warm up.

More of a pain in winter... If you're one of those without a magic electrical windscreen.

However, the actual cylinder temperature is not the same as the coolant temperature.
The thermostat doesn't even open to begin cooling the engine on most diesels until 90degrees C. Now it may take the head and the engine block a while to reach that, but the internal cylinder temperature will be far, far hotter.

User avatar
supersonic
Lives Here
Posts: 81831
Joined: Fri Nov 25, 2005 11:50 am

Re: how do you drive a TDCi?

Postby supersonic » Thu Apr 12, 2012 12:53 pm

I might be wrong, but isn't one of the functions of the glow worms to preheat air to allow more complete combustion?

But again, without figures is really hard to say what the difference in fuel is.

User avatar
YeehaaMcgee
Posts: 5955
Joined: Sun Feb 26, 2012 13:30 pm

Re: how do you drive a TDCi?

Postby YeehaaMcgee » Thu Apr 12, 2012 13:29 pm

supersonic wrote:I might be wrong, but isn't one of the functions of the glow worms to preheat air to allow more complete combustion?

But again, without figures is really hard to say what the difference in fuel is.

Even if it is, it's already been posted, that the experts claim that the very maximum time a glowplug will be on is 3 minutes, In the coldest conditions.

User avatar
mrmonkfinger
Posts: 1431
Joined: Fri Sep 02, 2011 13:44 pm

Re: how do you drive a TDCi?

Postby mrmonkfinger » Fri Apr 13, 2012 07:55 am

YeehaaMcgee wrote:Even if it is, it's already been posted, that the experts claim that the very maximum time a glowplug will be on is 3 minutes, In the coldest conditions.


only the engine management unit knows for sure when you're running at normal economy, and that will be working from an engine block coolant temperature sensor

from experience, I lose economy on short trips in cold weather, noticably so.

User avatar
YeehaaMcgee
Posts: 5955
Joined: Sun Feb 26, 2012 13:30 pm

Re: how do you drive a TDCi?

Postby YeehaaMcgee » Fri Apr 13, 2012 10:06 am

mrmonkfinger wrote:only the engine management unit knows for sure when you're running at normal economy, and that will be working from an engine block coolant temperature sensor

And air-mass meters, and exhaust meters etc etc etc.
Seriously, the cylinders heat up to operating temperature much faster than the block does. Hell, if it didn't then a diesel engine just wouldn't work unless it was in a furnace.

User avatar
mrmonkfinger
Posts: 1431
Joined: Fri Sep 02, 2011 13:44 pm

Re: how do you drive a TDCi?

Postby mrmonkfinger » Fri Apr 13, 2012 10:50 am

yeehaa wrote:Seriously, the cylinders heat up to operating temperature much faster than the block does. Hell, if it didn't then a diesel engine just wouldn't work unless it was in a furnace.


true... and all this make precisely squat difference to a 45 minute trip


bluechair84 wrote:I wonder why the 90bhp eco will get higher mpg than my 90bhp (other than it being an estate). They do have eco tyres which I wouldn't want to go for, I've heard bad things regarding braking distances.


Round town the eco engine does that automatic stop-start thing. Plus other optimisations.

These low-emission, high-economy models come with fuel-saving measures that include longer-legged gearing, an intelligent alternator, economy-optimised engine management, low rolling resistance tyres, wind-cheating aerodynamic modifications, low-friction oils, a low-drag alternator and air conditioning drive-belt system and a gearchange indicator light.
In addition, the 109bhp 1.6 TDCI engine is optionally available with auto start-stop. This system automatically turns the engine off when the car is stationary to save fuel, in common with the similar systems pioneered by BMW and Mini over the past few years. We spent six months with this ultimate version of the Focus Econetic, to see how economical it is in reality and to discover whether its generally excellent qualities are enhanced by these eco modification

User avatar
YeehaaMcgee
Posts: 5955
Joined: Sun Feb 26, 2012 13:30 pm

Re: how do you drive a TDCi?

Postby YeehaaMcgee » Fri Apr 13, 2012 11:02 am

The gear-change light surprised me. The only one I've seen is in my father's Golf 1.6TDI which he got brand new last year.
It suggests that you change up very low in the revs - much lower than I would have considered. I think it's at roughly 1,200 RPM if memory serves me right. Basically just slightly above tickover!

User avatar
mrmonkfinger
Posts: 1431
Joined: Fri Sep 02, 2011 13:44 pm

Re: how do you drive a TDCi?

Postby mrmonkfinger » Mon Apr 16, 2012 07:33 am

YeehaaMcgee wrote:It suggests that you change up very low in the revs - much lower than I would have considered. I think it's at roughly 1,200 RPM if memory serves me right. Basically just slightly above tickover!


that would certainly be an 'economical' acceleration :shock:

PS this weeks highly exciting ford economy update: 260 miles, 70-75 on motorways no holdups, but did follow a lorry round the a/b road section in one direction @ 45-50... 52mpg (showing 55 on the dash).

User avatar
.blitz
Posts: 6248
Joined: Tue Sep 02, 2008 10:22 am

Re: how do you drive a TDCi?

Postby .blitz » Mon Apr 16, 2012 14:51 pm

mrmonkfinger wrote:This system automatically turns the engine off when the car is stationary to save fuel

How well does this work in practice?

You're waiting at the lights in winter, heater/radio/lights/wipers on and the engine turns off :? presumably everything else carries on working. What about power steering/brakes. And stop/start crawling in traffic? Must give the starter a workout.

User avatar
Thewaylander
Posts: 8689
Joined: Mon Mar 03, 2008 18:05 pm

Re: how do you drive a TDCi?

Postby Thewaylander » Wed Apr 18, 2012 12:41 pm

.blitz wrote:
mrmonkfinger wrote:This system automatically turns the engine off when the car is stationary to save fuel

How well does this work in practice?

You're waiting at the lights in winter, heater/radio/lights/wipers on and the engine turns off :? presumably everything else carries on working. What about power steering/brakes. And stop/start crawling in traffic? Must give the starter a workout.


Mixed reports on this, as they wont work until the engine is nice and warm, so for the first 10-15 minutes. Then if they break there very expensive to repair which pretty much wipes out there fuel saving. Also stop starting an engine are some of the worst points of strain on an engine :S

User avatar
Redhog14
Posts: 1309
Joined: Mon Dec 14, 2009 17:22 pm

Re: how do you drive a TDCi?

Postby Redhog14 » Thu Apr 19, 2012 13:57 pm

You know i though I was the only one who was bit geeky about MPG.. i have an 05 BMW 320d - I have seen the MPG creep up in the last few months having noticed it drop by 1 or 2 MPG's over the winter. I only do 22miles per day total in my commute and have never bettered 41MPG (Cross country too) yet on motorway runs it quickly stretches to 49mpg + Wish I had bought the petrol.
@surroundedbh

User avatar
jndb72
Posts: 601
Joined: Fri Oct 16, 2009 14:20 pm

Re: how do you drive a TDCi?

Postby jndb72 » Thu Apr 19, 2012 16:34 pm

Redhog14 wrote:You know i though I was the only one who was bit geeky about MPG.. i have an 05 BMW 320d - I have seen the MPG creep up in the last few months having noticed it drop by 1 or 2 MPG's over the winter. I only do 22miles per day total in my commute and have never bettered 41MPG (Cross country too) yet on motorway runs it quickly stretches to 49mpg + Wish I had bought the petrol.


I have the same car from the same year (163BHP). Averages in the low 40's driving local (but it's very mountanious around here). Average low 50's on a motorway run with cruise control on.
2011 Canyon Nerve AM 5.0
2009 Specialized Rockhopper Disc

I might have alzheimer's but atleast I don't have alzheimer's


Return to “The Hub”

Who is online

Users browsing this forum: No registered users and 0 guests