A bit juddery at low rev?

[4x4_Gav]

Hi all,

This may be a daft question and me just not being used to driving such a large heavy car....BUT....

.. In a senario whereby say I am travelling along in 5 gear and slow right down, behind a car for example, right down to about 25-30 MPH then I try to speed up again staying in 5th gear.

When I do this I would be at around 1000 RPM or so and the car would feel quite juddery / jumpy - however you want to put it. Although it would eventually (but slowly) get up to speed.

Ive owned a 2 litre turbo diesel before and this did not use to struggle pulling away at low revs.

I have the 2.7 TDi T2 R reg. Does this engine like pulling at very low revs or should I stop being lazy and change down gears? :lol

If it shouldnt have an issue, is there anything I can clean up, replace or maintain to make it run as it should. I work in IT and not a mechanic so be gentle :nenau

Thanks in advance,

Gav

 

[BigBlack]

I have the 2.7 TDi T2 R reg. Does this engine like pulling at very low revs or should I stop being lazy and change down gears? :lol

That would be my answer....

On the motorway at 2500rpm you are travelling at about 60mph, so in 5th gear doing about 25mph the engine will be barely turning over bar trying not to stall! You'd prob be better changing down to third

Dont forget the engines and gearing on these are like tractors and cant really be compared to a 'normal' car youve had before

I take it from a standing start it will rev and accelerate through the full range... even if it takes about 16seconds to 60!!! :lol :lol

 

[4x4_Gav]

hehe... Thanks a lot mate, change in driving style it is then :naughty

 

[Timbo_1975]

Change down. Should be in 3rd at about 25mph.

This is a BIGish capacity heavy 4 cylinder motor with a high compression ratio. No dual mass flywheel, no balancer shafts, so course it's not going to like 1000rpm under load.

 

[leafy1]

I need to drive my T2 2.7tdi a totally different way to any other motor I have owned as they don't like being in a high gear at low revs.

 

[4wheel]

Juddery

I only use 5th above 1800/2000 rpm.T2 seems to be comfy at that.My diesel cars were able to handle lower revs in 5th but most of my diesel 4x4's were not happy in 5th unless over 2000rpm.I also stay close to 3000rpm during gear changes - gives me better fuel economy.However saying that it's just my personal driving style so may not be every ones cup of tea.Some may say I drive like and old far* but I reckon driving from Chippenham to Wexford towing a trailer through the snow on less than 1/2 tank is good enough for me.:augie

 

[clivvy]

i'd definately gear down in that scenario, its something I had to get used to coming from a Mazda V6 MX-6 to a Maverick. I also find that the rev counter is very helpful, so for example on my mazda I could drive in 5th, at any speed from 5 mph up to whatever at approx 1k rpm upwards and its smooth as silk. In the maverick, for smoothness, i triple it, so in fifth, i want to be at 3k RPM at least. The other thing I learned was that I had to rev harder for longer between gear changes, so usually from 2nd to third, third to fourth etc, I let it rev right up to 3/3.5k RPM before changing gear, otherwise it doesnt like it much! It is like learning to drive again, but now im used to it, it feels right!

 

[lacroupade]

Change down. Should be in 3rd at about 25mph.

This is a BIGish capacity heavy 4 cylinder motor with a high compression ratio. No dual mass flywheel, no balancer shafts, so course it's not going to like 1000rpm under load.

and as any automotive engineer will tell you, when an engine is staggering under low revs like that its suffering the WORST possible stress which will shag the engine very quickly.

Definitely way too high a gear.....I often don't bother getting out of fourth in town...

 

[ssteve]

and as any automotive engineer will tell you, when an engine is staggering under low revs like that its suffering the WORST possible stress which will shag the engine very quickly.

Definitely way too high a gear.....I often don't bother getting out of fourth in town...

I am a automotive engineer!! and he's right, but check your gearbox mounting mine was bust and jumped about a bit!

ssteve

 

[4x4_Gav]

lol all fair comments, feel a bit thick now

I am just trying to find the most "economical" way to drive this beast and clearly that way is the wrong way lol!!

Cheers

 

[clivvy]

nah its a good question Gavin. you kinda expect, from a big engine, to be abel to drive like that, but what you find is that these engines are big yes, but different. they are workhorses, and not GT cruisers!

i love mine me, i just love that engine.

 

[leafy1]

and as any automotive engineer will tell you, when an engine is staggering under low revs like that its suffering the WORST possible stress which will shag the engine very quickly.

Definitely way too high a gear.....I often don't bother getting out of fourth in town...

Same here .....I rarely even get into 5th when driving about town.

 

[(RIP) PLANK]

you ain't the firt to ask this and you wont be the last! just rev it longer in each gear and change up at higher revs than a petrol engine and you'll be fine. A few revs can help save all those sooty emissions at MOT time too :thumb2

 

[clivvy]

you ain't the firt to ask this and you wont be the last! just rev it longer in each gear and change up at higher revs than a petrol engine and you'll be fine. A few revs can help save all those sooty emissions at MOT time too :thumb2

Thats it exactly, my mate had to tell me that when I first got my Maverick, and he was very right!

 

[makeitfit]

Nah, you're all wrong :augie










DRIVE IT LIKE YOU STOLE IT :naughty :lol

 

[zippy656]

maybe thats why you get stopped so much

 

[rustic]

Nah, you're all wrong :augie
DRIVE IT LIKE YOU STOLE IT :naughty :lol

I agree with that prior to MOT time, clears out all the carbon deposites.
Can't afford to do that under normal driving, otherwise I would be stopping at more fuel stations than I do now

If I do weeks of short distance driving, ie less than 5 miles each trip, it really benefits from a 50 mile motorway run, red line each gear not 5th though....

It runs really well after, you can't see it getting worse day by day, but after (or even during) the red line run you can feel it pulling better.

Diesels like working hard.

 

[(RIP) PLANK]

Diesels like working hard.

mine never does anything else :naughty