How to turn start stop function off?

kefir32

I have an Audi A3 S line s tronic TDI and I would like to turn the start stop function off as I find it very annoying especially in city driving, I am sure its not good for a diesel engine anyways constantly turning on and off?!
Cant seem to find anything in the manual but Im sure its possible to do without taking to garage to disable.
Any input appreciated !

colm_mcm

Do you have to press it every time you start the car though?

Noccy_Mondy

Ya you have to press it each time you start the car. If you want it permanently turned off, then that'll require a trip to the dealer.

MuppetCheck

Noccy_Mondy wrote: »

Ya you have to press it each time you start the car. If you want it permanently turned off, then that'll require a trip to the dealer.

Someone with VCDS can do it, although on certain models it won't work, much cheaper.

Desolation Of Smug

Someone 'splain to me how start stop on a TDI is a good idea? Long fast run, Nice hot turbo...comes to a traffic jam..bosh, engine off....then sits...then bosh, engine on...and off....and on....baking the static oil onto the red hot turbo bearings......and repeat.


"Let the engine idle for 30 seconds on a turbo before stopping it......" how are you..

Renegade Mechanic

Desolation Of Smug wrote: »

Someone 'splain to me how start stop on a TDI is a good idea? Long fast run, Nice hot turbo...comes to a traffic jam..bosh, engine off....then sits...then bosh, engine on...and off....and on....baking the static oil onto the red hot turbo bearings......and repeat.


"Let the engine idle for 30 seconds on a turbo before stopping it......" how are you..

Because spending thousands on turbo/dpf/flywheel ring gears doesn't release the emissions that would otherwise be released, were the car to be running all the time.



Though one wonders how much emissions go into the logistics and fabrication of the parts you'll likely be replacing... I Dunno if its hypocrisy or sheer thickness on the part of everyone involved..

Gael23

How does it work in a manual? I only have experienced in an an automatic Golf so you just put the foot on the accelerator and the engine starts again.

Renegade Mechanic

Gael23 wrote: »

How does it work in a manual? I only have experienced in an an automatic Golf so you just put the foot on the accelerator and the engine starts again.

Iirc, it's when you come to a stop and press the clutch, the engine stops. You can release it then press it again when you want to take off.

MuppetCheck

Gael23 wrote: »

How does it work in a manual? I only have experienced in an an automatic Golf so you just put the foot on the accelerator and the engine starts again.

It starts as soon as you touch the clutch and stops as soon as you let out in neutral.

Useless turbo killer.

Desolation Of Smug

MuppetCheck wrote: »

It starts as soon as you touch the clutch and stops as soon as you let out in neutral.

Useless turbo killer.

I know nathin about stop/start, but it strikes me as a guaranteed route to a new turbo being needed..

Gael23

Desolation Of Smug wrote: »

I know nathin about stop/start, but it strikes me as a guaranteed route to a new turbo being needed..

I imagine it's a starter motor killer too. In the DSG you just come to a stop and the engine cuts out, if your driving in town then you should always have it switched iff

Desolation Of Smug

Gael23 wrote: »

I imagine it's a starter motor killer too. In the DSG you just come to a stop and the engine cuts out, if your driving in town then you should always have it switched iff

I think they use beefier starters. Doesn't stop the oil boiling onto the turbo spindles tho...

moonship

Desolation Of Smug wrote: »

I think they use beefier starters. Doesn't stop the oil boiling onto the turbo spindles tho...

start stop systems incorporates electric water pumps so turbo is kept cooled while stop

Renegade Mechanic

moonship wrote: »

start stop systems incorporates electric water pumps so turbo is kept cooled while stop

Fitting a water cooled turbo is still a poor compromise. You've still got a turbine spinning at 100,000rpm that's suddenly lost its oil feed. (Same reason you shouldn't tow an automatic).
Even if the remaining oil is slightly cooled, theres still not enough of it. Its just delaying the inevitable.

*Kol*

Would the turbo be spinning at 100k rpm at idle??

Renegade Mechanic

*Kol* wrote: »

Would the turbo be spinning at 100k rpm at idle??

In use, they spin @ up to 250k rpm :eek:

The idea of letting them idle is for two reasons, one indeed is to let them cool but the other, which ties into the cooling, is to let the turbo slow down as much as possible before the engine is switched off. (probably around 70/80k rpm)

This happens also as the oil cools, regaining a little bit of its viscosity, slowing down the turbo. In a water cooled job, the oil is only marginally cooled in the time it takes the engine to stop spinning.

It's all about that "Co2 per kilometer" rating. (Chape tax) They measure the carbon footprint of a running car but ignore the carbon footprint of it's maintenance channels..

*Kol*

I turn it off in traffic as I find it annoying more than anything else. The A4 I have seems to determine when it works depending on some variables that I don't know (maybe temperature of the engine, battery voltage etc) so it doesn't always shut the engine down.

whomitconcerns

there was an article somewhere on this topic which said the starter motors in suchlike were rated for 100,000 starts I seem to remember...will try find it

Donne

I have a Golf VII with this installed, and it only works intermittently.

Has anyone an idea why this might be?

Renegade Mechanic

Renegade Mechanic wrote: »

It's all about that "Co2 per kilometer" rating. (Chape tax) They measure the carbon footprint of a running car but ignore the carbon footprint of it's maintenance channels..

Perverse, but it's politically correct.

MuppetCheck

Donne wrote: »

I have a Golf VII with this installed, and it only works intermittently.

Has anyone an idea why this might be?

Conditions need to be met. If the engine is cold it won't work immediately. Lots of short trips? Air con cooling a lot?

marketty

It's almost like manufacturers will do anything they can get away with to force a car into the 'chape tax' bands, since that's what everyone wants these days, and then sell you a new turbo, dpf, etc etc every couple of years...almost

mickdw

I don't think the systems are quite as stupid as being made out here. I Don't agree with stop start at all but there are alot of conditions to be met before stop stsrt will activate.
I rarely see it activate on a passat we have here.
I certainly don't believe that it would activate at the first set of lights following a long drive.

colm_mcm

marketty wrote: »

It's almost like manufacturers will do anything they can get away with to force a car into the 'chape tax' bands, since that's what everyone wants these days, and then sell you a new turbo, dpf, etc etc every couple of years...almost

You've got things like the ACEA agreement where manufacturers have agreed with the EU to collectively reduce emissions, then you have market reasons like taxes.

MuppetCheck

mickdw wrote: »

I don't think the systems are quite as stupid as being made out here. I Don't agree with stop start at all but there are alot of conditions to be met before stop stsrt will activate.
I rarely see it activate on a passat we have here.
I certainly don't believe that it would activate at the first set of lights following a long drive.

It does on any car I've had with it. I'd like to think cars weren't engineered to fail but I'm not convinced that there was thought given, intentionally or otherwise, to the impact of stop start systems bar emissions.

bazz26

I had it in my two previous cars, don't have it in my current car and I can honestly say I don't miss it. When I did have it the engine would cut out then you could be almost guaranteed the traffic would start moving again.

Damien360

mickdw wrote: »

I don't think the systems are quite as stupid as being made out here. I Don't agree with stop start at all but there are alot of conditions to be met before stop stsrt will activate.
I rarely see it activate on a passat we have here.
I certainly don't believe that it would activate at the first set of lights following a long drive.

Exactly the same in skoda superb. Cold engine or long hard drive conditions to a full stop and it will not activate.

Are there mechanics here that have seen more failures of turbos with stop/start systems. Keep hearing it anecdotally but when I ask mechanics, they have not seen the issue.

Bit like the small engine with big bhp, everyone said it would be massive issue but not sure it is any worse.

Tropheus

Also have a Skoda Superb with it. Got it a month ago with 80k kms. It's a 1.6d and there have been no issues. Also hearing potential turbo problems, but no hard evidence. Agree that it's fine when you stop and start the odd time, but a pain in heavy traffic. Have yet to experience it in very warm weather when it shuts the aircon off. I do realise we live in Ireland

markpb

I'm curious about the people who say it's a pain in city terrific - surely that's exactly the situation that it was designed for?

whippet

I have nearly 200k on a superb with the stop/start and hasn't given any issues yet with turbos etc. it is a little annoying in stop start / crawling city driving, but I just switch it off then

markpb

OSI wrote: »

In a diesel it is. Brrr-chugga-chugga-chugga

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silence

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BRRRR-CHUGGA-CHUGGA-CHUGGA-CHUGGA!!

Really? I've been both a driver and passenger in several diesels (2011 onward) with start-stop functionality and none of them did that.

Special Circumstances

markpb wrote: »

Really? I've been both a driver and passenger in several diesels (2011 onward) with start-stop functionality and none of them did that.

Diesels, and australians, can't whisper. Many people just accept that and love them all the same. Denial is a worry though.

AndyBoBandy

I have driven numerous (rental) cars with the stop start system, (Audi, BMW, Mercedes, VW + many more) and love it,

regarding the question of it cutting out the AC, I've found that if stationary for long enough at a set of lights etc... after a minute or 2 (if you have the AC on) the engine will start again even without depressing the clutch (or brake in an Auto).

mickdw

Andybobandy wrote: »

I have driven numerous (rental) cars with the stop start system, (Audi, BMW, Mercedes, VW + many more) and love it,

regarding the question of it cutting out the AC, I've found that if stationary for long enough at a set of lights etc... after a minute or 2 (if you have the AC on) the engine will start again even without depressing the clutch (or brake in an Auto).

To be fair it doesn't suit 4 cylinder diesels at all. They are not refined enough to have an unnoticeable stop start whether it be noise or vibration through pedals or cabin on startup.
The toyota / lexus hybrid has the stop start idea down to a fine art and in the go 450h, it is simply stunning. I know this is a different setup being hybrid but it is very much suited to hybrid where the engine can be killed for extended periods in towns.
In short, it's a gimmick on anything other than hybrid.