The stuff coming out of the back of the Mondeo is caused because too much fuel is being injected without enough air because the turbo takes time to increase the boost pressure (the combustion process is not optimum).

Its not like all that soot is sitting in the engine somewhere & revving it hard blows it out...

What's a diesel mondeo got to do with a vRS TSI?

Another thread in the O3 section that's going nowhere I think......

You've just answered your own comment.... All the gunk coming out the back of that Mondeo would have stayed in the exhaust/turbo/egr/inlet etc.  It needs exercising... not thrashing... just using the full range of rpm every now and then when at temperature in a well maintained car to keep the internals as clean as possible.... Something fuel additives alone can help with but not do on their own.

You're advocating unblocking a sewer by forcing big turds down the toilet to push things alomg. The end result may see more crap exiting out of the other end, but that's at least partly due to firing more ad higher velocity crap at it in the first place. Regular servicing and maintenance is the best way to keep the waste flowing.

 

This of course is all assuming that the Octavia TSI toilet is already blocked in some way, which is unlikely due it being less than a year old at most.

Edited 3 March, 201412 yr by Orville

Just want to say, I didn't say 'thrash'.

I just wondered if decent 'progress', i.e. giving the car a proper workout (without hugely overdoing it) once in a while was either helpful or necessary in keeping a petrol engine in fine fettle.

 

As long as during your driving the engine is allowed to get fully warmed up, its not necessary.

If you do lots of very short journeys where the engine doesn't warm up, then driving for an extended period every now & then is a good idea. 

But, there is also no harm in enjoying the reason you bought a Petrol Turbo engine either

I worked as a vehicle technician for 13 years until a complete career change a few years ago. A service would always involve a road test afterwards to confirm all was well. I had a set route over 4-5 miles which had varied driving with just enough of each type to assess the car. I always took the engine to near maximum RPM a couple of times as part of the road test. I would say that 75% would produce plumes of black smoke after the first time of the engine at high rpm, the second time less. Diesels the smoke was visible anytime of day, with the road behind disappearing in a cloud of black smoke. Petrols were less easy to see, except when it was dark and a car was behind, the smoke could be seen in headlights then. This was done to check the engine through all the rev range although it did appear to clear the exhaust system of soot deposits.My opinion of does a petrol turbo need it giving the beans once in a while? In every day use, not really. I don't think there is any huge benefit to this, if the car is driven with some vigour occasional that should be sufficient. I don't think it is a nessaty to bounce the engine off the limiter once a week in an attempt to keep the engine "clean".

Ironically the diesel smoke test for MOT test left quite a few cars failing. The fix for most was a fuel treatment and blast down the motorway at higher RPM's to clear the system. Most cars passed the smoke test after this "fix".

As a technician it was difficult to tell if a service improved a cars running etc, all we did was fit serviceable items as per the service schedule, change the oil etc. It was not like the old days when you adjusted the points and adjusted the emissions which did make a visible difference.

I now no longer service my own cars and can always tell the difference before and after a service has been done, so hopefully the customers cars I worked on did notice a difference for their money!

Driving it like miss daisy all the time is bad, IMHO.  It does it good to get its legs stretched from time to time, whichever car or engine it is.

 

I still know it as an "Italian decoke".  I still believe in it.  Not every day, but every now and then.  If I had to pick a time interval, once a tankful?  Get it to temp, and stretch it to the red line a couple of times (probably only in 2nd gear given speed limits etc).  You won't hurt it.

The cars are designed to be run at maximum revs, the output and rev limit of the engine is set well below manufactured tolerances to ensure longevity. Thats why turbo cars can generally be so easily and reliably remapped.

Its however not that wise (though im sure we all do it from time to time) to blast the hell out of a car from cold as thats how wear and tear occurs.

i also dont think its necessary nowadays to warm down a turbo, most modern cars have aux pumps to keep the bearings lubed as it spins back down etc. Otherwise Stop Start would contribute to knackering a cars turbo which I dont think it does. Again do not misquote, not suggesting its not good practice to warm a car down but just saying its not entirely necessary anymore....old Imprezas and Cossies whos turbos were made of butter perhaps but not nowadays.

+1 for the anti-driving miss-daisy here, and feel I can put a measured perspective in here.

 

Given the youngest MK2 cav is now 25 years old, and many are well over 30 now we have direct access to vehicles that have had decades of systemic use. 

 

Categorically the worst performing cars are the ones with the lowest mileage, or more gentle use.

 

Examples that come to mind (all from dyno sessions).

 

1.8 Never driven past 3K - Stock bhp 115. (One owner from new) - 89 bhp

1.8 Ragged every day of it's life, current owner 10 years - 118 bhp.

 

SRi130 - Stock 128 bhp - 16k miles on the clock (several like this) - 115bhp

SRi130 - Stock 128 bhp - 100k+ miles on the clock (again several like this) 130+bhp

 

Dirty 1.6 264k never serviced GL stock 90 bhp - got 83

Pristine lovingly re-built never thrashed SR 1.6 - got 82.

 

All academic, and anecdotal, but on my mind as this was only a month or so back and really eye-opening that this trend came out.

 

Yes it becomes a bit like the broom / hammer with handles as a worn car will have had more new parts fitted - but in terms of response and power, cars with a life have looser engines that tend to want to "go" more, (right up until they go bang at moon mileage for whatever reason!) Ultimately the happy medium with ALL kinds of driving - perhaps bar the OAP at 9k revs in a metro trying to find reverse..

Wonderful image... that metro crying at 9K...

Thrash it everywhere. Enjoy it.  Joke.

 

I drive steady and then give it a good work out on the motorway once in a while. It's a nice car, enjoy its acceleration and power.

For older cars, it is of course a different story.

The idea of "running an engine in", giving it a good run every now & then or idling the car to warm it up before driving etc come from these because it was probably necessary. 

 

My point was that modern petrol & diesel engines are electronically controlled with complex software so that the engine should run a very clean controlled combustion in all conditions.
Fuel Quantity, timing, spark, fuel pressure, boost pressure, air flow, coolant flow etc etc are all monitored & controlled.

Manufacturing tolerances & design methods (stress analysis, durability testing) are all far more advanced these days.

 

Therefore with a modern engine there is no need to drive it one way or another.
You can drive it the way that you want & it will be fine.

Obviously within the mornal limits described by others here... like taking care when the engine is cold & not driving at 9k in reverse...

I feel for all you lot stuck in the UK lucky me over here in Germany having no problems stretching the VRS good old Autobahns:-)

I get over there several times a year, fully looking forward to my two summer trips in the new Octy! 

For older cars, it is of course a different story.

The idea of "running an engine in", giving it a good run every now & then or idling the car to warm it up before driving etc come from these because it was probably necessary. 

 

My point was that modern petrol & diesel engines are electronically controlled with complex software so that the engine should run a very clean controlled combustion in all conditions.

Fuel Quantity, timing, spark, fuel pressure, boost pressure, air flow, coolant flow etc etc are all monitored & controlled.

Manufacturing tolerances & design methods (stress analysis, durability testing) are all far more advanced these days.

 

Therefore with a modern engine there is no need to drive it one way or another.

You can drive it the way that you want & it will be fine.

Ehm, no. Here in DK our diesel is a little less clean, than in the countries surrounding us. And many folks around here are experincing clogged up EGR valves, VNT´s etc. due to driving like "Miss Daisy", where other people who are using the RPM range once in a while ("Trashing" with your words) does not experience these things.

 

So, IMHO you are the one "trashing" the car, by cruising around with max 2500 rpm and below

Interesting point

Topic says petrol turbo...

Assuming this thread is about the vRS TSI then why buy it if you're not going to "give it beans" occasionally?