Idle RPM of Diesel Engine
Kevin B
800rpm. I've noticed that when I'm in traffic jams
and I want to crawl along, if I release the clutch
very slowly (as you do) without touching the accelerator
the engine increases to 1000 rpm. Depressing the clutch
drops the rpm back to around 800. Is this normal for a
diesel engine, or something to do modern electronic engine
management. I can live with it, as it comes in handy when
crawling uphill, but it's also annoying all the same.
Just curious really.
Kevin B
--
This Email Scanned By Norton Internet Security Pro
Prior to sending to mail server.
Steve
Kevin B
Mark Craft
revs.
some cars do it if you switch all the electrics on...
"Kevin B" <a...@aup.aup.eu> wrote in message
news:O7Twa.484$0a1.3...@news-text.cableinet.net...
Jon H
news:rhTwa.5666$Mu3....@newsfep4-glfd.server.ntli.net...
> It's the ECU peventing the engine stalling, quite useful really.
Not if you're capable of driving a car with any degree of ability IMHO. My
ZX TD will grunt away at idle and pull away quite ahppily. ECUs taking over
are a pain in the butt, when i test drove a Clio dci when it first came out
the bloody thing nearly died when i tried to quickly cross a busy road, i
assume because i floored it at *very* low revs. The old mechanical injection
on my TD might be old tech, but it doesn't faff about like that ta very
much.
Cheers,
JH
PJML
>
> "Steve" <nu...@ntlworld.com> wrote in message
> news:rhTwa.5666$Mu3....@newsfep4-glfd.server.ntli.net...
>
> > It's the ECU peventing the engine stalling, quite useful really.
>
> Not if you're capable of driving a car with any degree of ability IMHO. My
> ZX TD will grunt away at idle and pull away quite ahppily. ECUs taking over
> are a pain in the butt, when i test drove a Clio dci when it first came out
> the bloody thing nearly died when i tried to quickly cross a busy road, i
> assume because i floored it at *very* low revs.
Defensive programming at its best: cut the power if the user
tries to do something stupid like load the engine at next-to-
zero RPM! Saves potentially knocking-out the big-ends. It's
the other-end-of-the-rev-range equivalent of a rev-limiter.
Kevin B
I was just wondering about it because I'm not
used to all this moderm gadgetry as I've been
driving old and clapped out sheds for most of my
driving years.
Funnily it's also hard to break old habits.
I still turn the radio on or adjust the volume with
the knob on the radio despite the car having controls
on the steering wheel.
I still ask the wife to wind her window up when it's
getting drafty, even though it's controlled by a electric
button.
Kevin B
--
This Email Scanned By Norton Internet Security Pro
Prior to sending to mail server.
"Mark Craft" <nos...@myaddress.com> wrote in message
news:3ec4af2c$0$10623$ed9e...@reading.news.pipex.net...
S
it pulled like a train without touching the accelerator and just lifting the
clutch.... lovely car... my ibiza tdi you have to give it welly to pull away
and will stall so much easier.
thats progress for you!
S
"Jon H" <jon.p.harr...@bt.com> wrote in message
news:ba2clc$e4k$1...@pheidippides.axion.bt.co.uk...
Mark
news:3ec4af2c$0$10623$ed9e...@reading.news.pipex.net...
> the revs.
>
> some cars do it if you switch all the electrics on...
It also confused me when I first made the leap from an old carburettor
engine car to a more modern ECU controlled one. I find it handy in
stop-start traffic jams to just lift the clutch and let the ECU increase
the revs without me needing to touch the throttle.
Jon H
news:3EC4B8DB...@nerc.ac.uk.loopback...
Personally I'd rather take the risk of knackering big ends (which curiously
hasn't effected my ZX so far) than have a Mondeo buried in the passenger
side of the car because the computer thinks it knows best.
The clanking and spluttering had to be heard to be belived and if that's
putting less load on any part of the engine, I'm a banana.
JH
Jon H
news:3ec4d82f$0$20849$afc3...@news.easynet.co.uk...
> Yep, know what you mean Jon, i used to have a DTurbo 306 with the XUD in
and
> it pulled like a train without touching the accelerator and just lifting
the
> clutch.... lovely car... my ibiza tdi you have to give it welly to pull
away
> and will stall so much easier.
>
> thats progress for you!
I'd certainly like to change my ZX one day soon, but i'd think seriously
about taking on one of these dreadful setups that seem to have robbed the
low end grunt that i love from diesels.
Having said that the Arosa TDi i tried had a very long legged feel and quite
happily pulled from low revs, no need to slip the clutch here all the time!
Must try one of the HDi Pugs to see how they feel.
Cheers,
Jon H.
Jon H
news:3ec4af2c$0$10623$ed9e...@reading.news.pipex.net...
> revs.
>
> some cars do it if you switch all the electrics on...
Amazingly my rolling reck on a K10 micra does that. Having said that there
is so little power (anywhere in the rev range) it would probably stall if
you popped the lights on without it. :-)
Cheers,
JH
DervMan
> 800rpm. I've noticed that when I'm in traffic jams
> and I want to crawl along, if I release the clutch
> very slowly (as you do) without touching the accelerator
> the engine increases to 1000 rpm. Depressing the clutch
> drops the rpm back to around 800. Is this normal for a
> diesel engine, or something to do modern electronic engine
> management. I can live with it, as it comes in handy when
> crawling uphill, but it's also annoying all the same.
>
> Just curious really.
It's quite normal: it's increasing the power for a number of reasons, which
vary from car to car but include emissions, power steering, brakes, so on
and so forth.
Kermit's idle speed increases when you either put the donk under load at
very low speed, or you are moving forward at a pace around walking. At
first, I found this a bit annoying, especially being used to the Mondeo TD's
rock solid idle speed, but I did soon get used to it.
--
The DervMan
www.dervman.com
DervMan
> news:rhTwa.5666$Mu3....@newsfep4-glfd.server.ntli.net...
>
> > It's the ECU peventing the engine stalling, quite useful really.
>
> Not if you're capable of driving a car with any degree of ability IMHO.
But modern engines are usually designed to put emissions as their first
priority, so what R2D2 is saying to itself, "well I could keep the donk
running, but I'll be doing bad things to the trees, so instead I'll shut
down and show the blue screen of death for a bit." ;)
> My
> ZX TD will grunt away at idle and pull away quite ahppily. ECUs taking
over
> are a pain in the butt, when i test drove a Clio dci when it first came
out
> the bloody thing nearly died when i tried to quickly cross a busy road, i
> assume because i floored it at *very* low revs. The old mechanical
injection
> on my TD might be old tech, but it doesn't faff about like that ta very
> much.
This is the very same reason why I avoid such conditions when testing a new
and unknown car, 'cos you don't know how it'll respond. Unfortunately, the
ECU is here to stay, though. :(
I recall stalling a very early Focus TDCi at a busy roundabout. Software
patches have improved the ECU / engine's behaviour, but it's not the same as
"good old fashioned" engines, heh.
Although the V6 Scimitar I borrowed was a *pig* when the engine was cold,
and even when warm, boot it and you could hear the engine take a deep
breath, then the reheats came on song . . . :) My mark two Fiesta was also
a swine when cold and partially warm.
--
The DervMan
www.dervman.com