@idontlikechips 30mph in 6th - Nice way to kill your clutch!
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VAG diesel question
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Posted 2 years ago #
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oh and modern diesel now inject on the exhaust valve opening cycle now to twice burn the dirty gasses to get a cleaner exhaust gas.
sneaky!
Posted 2 years ago # -
136bhp focus diesel runs best at a setting where you get about 160-165 bhp out the engine BUT this pushes it up over the 160 limit on CO2
Surely if it's more efficient as you say, CO2 will be less at the same level of acceleration? As per the original topic of the thread?
And as for 30mph in 6th - my Father in law insists that driving at revs of say 1.1-1.3krpm will kill the engine, but he's unable to explain why. I thought maybe they oil pressure would be low but otherwise I don't see the problem..
Posted 2 years ago # -
Blimey 30mph in 6th......my 130 TDi is at about 1800rpm at 70 in 6th.
That equals 25.7 revs/mph (1800/70) in 6th gear - so at 30mph you are only revving at about 770 rpm.....that can't be great for the engine - and it really pulls from that low down?
I have always been advised to check for a slipping clutch (if buying a 2nd hand car or whatever) by putting the car in 5th & flooring it. Don't know the ins and outs of why, but a few people have said it & so I assume they aren't all wrong. That being the case and the purpose of doing this being to check for a slipping clutch, I would have thought high gear/low speed = bad.
Posted 2 years ago # -
such is my sad life that i spend a lot of time wondering whether our cars (Passat PD130 6 spd and Golf 2.0 GT TDI) are more efficient when driven consistently in the high torque band or with the revs as low as possible. I've never been able to decide, they seem to do the same mpg if you tickle along in sixth all the time from 40-70mph or if you change down to keep the revs up a bit on the hills.
Posted 2 years ago # -
it's more efficient BUT it produces more amounts of gases (so the percentage of nasty gases are LESS but the volume is more) it's a loosing battle to get the cars efficient and powerful. you will see diesel engines in 10 + years time being a 2.0l engine but only producing 75-80 hp! once euro 6+ come in (currently euro 5 is due soon)
sticking your foot down at 30mph doing 1.1k in a diesel will/could easily kill the clutch and could easy twist and snap the crankshaft given modern diesel torque's. we see it in lorries a lot! (different torques and forces but the same applies). it's not when the engine is most efficient too, the car will overfuel to compensate for the "need" of the acceleration and you will get black soot/smoke, blocking up your DFP filters meaning they need to be serviced and changed sooner. your better to get to 1.8-9k after the turbo boost has kicked in and the clutch has got some movement in it, it's known to break duel mass fly wheels booting it at low RPM and with high torque loads.
thing my PD150 is 70mph @ 2k.
Posted 2 years ago # -
Ive got a Ibiza FR 130pd and had to replace the turbo recently, the car had done then 60k. The propellor shaft snapped on the intercooler side of the turbo. I drive my car pretty slow most of the time so could this be the clogging vein bit that was mentioned?
Posted 2 years ago # -
When i got mine (the 130 Sport is the older version of the TDi FR), it was 3yrs old with 24k miles on.
It was very sooty under acceleration.A few weeks later & some spirited driving once it was nicely warmed up & it hardly smokes at all now.
A week of driving in grandad mode soon clogs things up though.You get an impressive amount of soot (and an unimpressive drop in power)if your boost pipe fails!
Soon stops tailgating Vectras though!Posted 2 years ago # -
@fozzybear it's the car's party trick. i've only done it when i've been feeling lazy. 43k and still on the first clutch with no slips yet *touching wooden desk* it eats tyres though.
Posted 2 years ago # -
@Buzzlightyear - no that is a turbo issue, sounds the like bearings have play and your service ppl never spotted it..
idontlikechips wow mine was changed at 58k the clutch would slip that was on the 150 bhp setup!
as for tyres, i've fixed the eating tyres issue. i have wider (225's) now and a slightly harder compound, loads of grip and a bit more noise but thats better that the less grip / vanishing rubber situation.
Posted 2 years ago # -
driving at revs of say 1.1-1.3krpm will kill the engine, but he's unable to explain why
Ive got a Ibiza FR 130pd and had to replace the turbo recently, the car had done then 60k. The propellor shaft snapped on the intercooler side of the turbo. I drive my car pretty slow most of the time so could this be the clogging vein bit that was mentioned?
Compressor surge will kill turbos, Buzz did/do you ever notice a funny juddering when accelerating? more subtle than DMF judder but very noticeable, anyway that's surge, say you put your foot down at 1500rpm in a high gear you will be asking the turbo to provide more boost than it can, air pressure will be higher post turbo which means it will pass back through the turbo the wrong way sometimes stalling the compressor wheel totally, smashing itself to bits or snapping the inpeller shaft.
It's a good idea to keep the revs above 1900-2000rpm unless you are cruising with very low load on the engine or in 1st or 2nd gear.
Posted 2 years ago # -
@fozzybear the p-zeros i'm using now have worn much better than the goodyears it came with, and i'm using 205 width tyres
Posted 2 years ago # -
fozzybear - which brand did you go for?
I have been using Goodyear Eagles on my Mrs 150bhp gt-tdi?
Posted 2 years ago # -
No i never noticed any judder and im carefull about putting the engine underload by putting the foot down when low revs, i would change down if needed. The turbo blew when accelerating out of a laybye on an Aroad to rejoin the main carriage way, i was in 2nd gear. Its been puzzling me why it went for a long time, the cars on 72k now and going fine on a recon turbo.
Posted 2 years ago # -
I use Kumho KU31s on mine and get ~30k miles out of the fronts - mostly motorway munching though on a standard car.
Camskill are cheap for them online - 205/45/16s were £105 for two delivered last time I needed some.
Posted 2 years ago # -
i changed to a 17" wheel and run falken tyres 452 will look to toyo proxes as a next tyre to test. very happy with the 452's though.
camskill are really good to.
Posted 2 years ago # -
@fozzybear toyo proxes are very good tyres but also very soft.
I do recomend P-Zero Neros, they were £90 per corner last time i got them, in 17/40/205, they are have been offering good grip all round and have been hardwearing
Posted 2 years ago # -
Buzzlightyear - Member
. Its been puzzling me why it went for a long time, the cars on 72k now and going fine on a recon turbo
Was the car second hand? a lot of diesel turbos die due to how they are treated as a lot of people don't know how to look after them.Posted 2 years ago # -
Yes it was brought second hand on 28k, so i had travelled 30k in it before it went. it could well have been abused a bit before.
Posted 2 years ago #
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