how do you drive a TDCi?

The centre for more serious off topic questions, light hearted banter and friendly chat.
User avatar
bails87
Posts: 13051
Joined: Thu Mar 12, 2009 22:26 pm
Contact:

Re: how do you drive a TDCi?

Postby bails87 » Fri Jun 15, 2012 09:48 am

35mpg?! Ouch!

I have a ~13 mile commute, on twisty country roads with 5-10 minutes of suburbs/sitting in traffic at either end, and even when I drive like a pleb (not necessarily fast, but getting back up to speed quickly after a slow corner) I don't get under 45mpg.
MTB/CX

"As I said last time, it won't happen again."

snowjho
Posts: 104
Joined: Mon Mar 05, 2012 12:54 pm

Re: how do you drive a TDCi?

Postby snowjho » Sun Jun 17, 2012 08:27 am

bluechair84 wrote:I've got my foot on the clutch at every opportunity. Even turn off the engine at lights I know I'll have to wait at for prolongues stays! Everything I do only gets me 53. I'll experiment with gearing.


I Thought its better to not have your foot on the clutch and 'freewheel' as more fuel is used to stop the engine from stalling. I try to depress the clutch as late as possible when stopping.

In my focus tdci 1.6 (110) 2009 i get 60mpg. I speend most of my time commuting on m3/m25 (30 miles/40min) ive often found its happier at 70 then 60. Ive become a bit mpg obsessed layely. 2,000 rpm or just over and the car cruises along nicely.

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

Re: how do you drive a TDCi?

Postby bluechair84 » Mon Jun 18, 2012 14:27 pm

never heard this before. I just try to keep the engine turning is slowly as possible to reduce the number of times the cylinders are firing. And although engine braking is minimal in higher gears, you don't have to keep up the revs to overcome this when coasting. It's surprising how far you can coast!

User avatar
bails87
Posts: 13051
Joined: Thu Mar 12, 2009 22:26 pm
Contact:

Re: how do you drive a TDCi?

Postby bails87 » Tue Jun 19, 2012 11:36 am

bluechair84 wrote:never heard this before.

I've heard it, admittedly only on top gear.

Essentially, when the clutch is up, the engine is (at least partly) kept ticking over by the wheels 'feeding' movement back into the engine. When you press the clutch down, the engine needs fuel (not much though, as it's not doing much) to keep itself going.

And I reset the mpg counter and have just been doing my traffic/blast/traffic commute, I'm down to 42mpg :shock: I need a motorway cruise to get it back up! :lol:
MTB/CX

"As I said last time, it won't happen again."

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

Re: how do you drive a TDCi?

Postby bluechair84 » Wed Jun 20, 2012 14:44 pm

god damn it... there's no action without consequence is there. I've tracked 5000 miles and averaged 53mpg.

User avatar
WisePranker
Posts: 745
Joined: Sun Jul 11, 2010 14:08 pm

Re: how do you drive a TDCi?

Postby WisePranker » Mon Jun 25, 2012 12:05 pm

bails87 wrote:
bluechair84 wrote:never heard this before.

I've heard it, admittedly only on top gear.

Essentially, when the clutch is up, the engine is (at least partly) kept ticking over by the wheels 'feeding' movement back into the engine. When you press the clutch down, the engine needs fuel (not much though, as it's not doing much) to keep itself going.


'Tis true.

When you're rolling along with the throttle closed, the amount of fuel injected into the engine is minimal. At higher engine speeds like when decelerating on the motorway, the fuel is pretty much cut off when the throttle's closed. It's to help improve fuel economy and reduce emissions.
If you freewheel with the clutch pressed or the car in neutral, more fuel is injected into the engine to keep it running.

Northwind
Posts: 15194
Joined: Sat Sep 06, 2008 18:53 pm

Re: how do you drive a TDCi?

Postby Northwind » Tue Jun 26, 2012 22:45 pm

In the course of this thread I aquired another TDCI, a 2.2 this time. And I drive it everywhere in clouds of soot and tyre smoke. Hope that helps.
Uncompromising extremist

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

Re: how do you drive a TDCi?

Postby bluechair84 » Wed Jun 27, 2012 07:12 am

Let me know what the fuel economy is like with this driving style, and if it hasn't gone down much I'll give the tyre smoking thing a try. No wait... mine's a 90hp engine... it has all the performance of a mobility scooter :(

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

Re: how do you drive a TDCi?

Postby Thewaylander » Thu Jun 28, 2012 15:07 pm

Northwind wrote:In the course of this thread I aquired another TDCI, a 2.2 this time. And I drive it everywhere in clouds of soot and tyre smoke. Hope that helps.


FR leon, i drive like this, screw econemy lol :P

bobpzero
Posts: 1325
Joined: Sat Apr 12, 2008 21:53 pm

Re: how do you drive a TDCi?

Postby bobpzero » Thu Jun 28, 2012 15:21 pm

Image
this might help

Northwind
Posts: 15194
Joined: Sat Sep 06, 2008 18:53 pm

Re: how do you drive a TDCi?

Postby Northwind » Thu Jun 28, 2012 17:49 pm

bluechair84 wrote:No wait... mine's a 90hp engine... it has all the performance of a mobility scooter :(


My Focus had the 90 horse enduro engine... Sure it's not mighty but the power delivery was fantastic, genuinely miles nicer to drive stop-start than the 130 or 155 versions. Lovely wee engine.
Uncompromising extremist

User avatar
plugp7
Posts: 263
Joined: Sat Jul 21, 2007 15:08 pm

Re: how do you drive a TDCi?

Postby plugp7 » Sat Jul 14, 2012 16:44 pm

Had a 1.6 (110hp) tdci Focus automatic. Lots of motorway at 75mph ish.
44mpg over 40k miles.
Cracking car.

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

Re: how do you drive a TDCi?

Postby mrmonkfinger » Mon Jul 16, 2012 10:15 am

bobpzero wrote:Image
this might help


does it make cups of tea?

User avatar
R8JimBob88
Posts: 245
Joined: Wed Dec 08, 2010 14:07 pm

Re: how do you drive a TDCi?

Postby R8JimBob88 » Wed Aug 15, 2012 13:45 pm

I'd be happy with 30mpg :(
If you do what you have always done, you will get what you always got....

Northwind
Posts: 15194
Joined: Sat Sep 06, 2008 18:53 pm

Re: how do you drive a TDCi?

Postby Northwind » Sat Aug 18, 2012 19:51 pm

So anyway, since I last posted in here I've put about 1500 miles on the 2.2 TDCI Mondeo, all good... But the economy's all over the place. I went to fort william twice this month and used the exact same route. First time, I averaged 42mpg on the way up and 50mpg home- that was with some pretty spirited driving especially on the way up though. On the way up the second time I decided to take things easy, and just by being more gentle and relaxed and obeying all the limits got 59.9mpg on the way up and 53mph on the way back (more traffic and stops coming home). I didn't have to make many sacrifices though to get the economy, and there's definitely more there if you drive purely for economy.

So quite different from my Focus where driving style didn't seem so important, but still gives decent mpg without having to drive purely for mpg.
Uncompromising extremist

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

Re: how do you drive a TDCi?

Postby bluechair84 » Tue Aug 21, 2012 20:11 pm

Christ, getting 60 is impressive. It's good to know it can be done! I've just driven up to Fort William (focus 1.6 90bhp) and got 54mpg, 51mpg whilst touring around the Isle of Mull, and 44mpg on the return leg home :shock: All with a roof box and quite a bit of gear in the back.

Northwind
Posts: 15194
Joined: Sat Sep 06, 2008 18:53 pm

Re: how do you drive a TDCi?

Postby Northwind » Tue Aug 21, 2012 20:42 pm

To be fair, that's trip-computer mpg so might be total lies. I was well annoyed not to get the 60 though, the last 5 miles or so was done on vapours but still not enough.
Uncompromising extremist

User avatar
bails87
Posts: 13051
Joined: Thu Mar 12, 2009 22:26 pm
Contact:

Re: how do you drive a TDCi?

Postby bails87 » Wed Aug 22, 2012 08:48 am

I drove up to Glentress a few weeks back, 600 mile round trip. On the motorway journey up there I averaged ~65mpg, once I hit the country roads that dropped but I think I arrived at GT with the avg for the trip still over 60. That's in a 1.8L 115 TDCI Focus. With me, a bike and a bootfull of crap. Once I was past Manchester and onto clear motorway set the cruise control to 70 and didn't slow down until I reached Scotland.
MTB/CX

"As I said last time, it won't happen again."

User avatar
360
Posts: 5934
Joined: Thu Dec 26, 2002 17:30 pm

Re: how do you drive a TDCi?

Postby 360 » Wed Aug 22, 2012 10:34 am

How many miles do you do a year?

A 5mpg over 10,000 miles is about 100 quid. I'd suggest you'd be better off taking up a paper round than tracking miles and driving around like a granny.

Northwind
Posts: 15194
Joined: Sat Sep 06, 2008 18:53 pm

Re: how do you drive a TDCi?

Postby Northwind » Wed Aug 22, 2012 12:15 pm

Think of the children 360

No, wait... Stop thinking about children.
Uncompromising extremist


Return to “The Hub”

Who is online

Users browsing this forum: No registered users and 0 guests