I thought you could not go to stage 2 with oem exhaust you cannot get high enough boost?

Not that I know..... But who the hell writes the rules for what a stage 1 or 2 Pd Vrs is? Is it the same for every company, or even every car?

Not that I know..... But who the hell writes the rules for what a stage 1 or 2 Pd Vrs is? Is it the same for every company, or even every car?

Point exactly, most every map is different, mine is custom and boosts rather late in order to save my clutch

All mapped diesels smoke, like i said in my first post is does not smoke much at all, i expected to be quite abit but obviously not

All mapped diesels don't smoke. They only smoke when the tuner has taken the quickest and ugliest way to raise power. Basically dropped the max a/f ratios far too low.

Boosting late to save the clutch sounds very strange. Inside the ECU the map features torque limiters which are used to limit torque at all different rpm points to save clutch/gearbox etc. They do this through limiting fuel, not boost.

If your tuner is dumping in fuel and then lowering boost to control torque then I'd be very concerned.

Such a tune would cost you fuel economy, power, clog up the DPF and in a sustained run possibly melt your pistons.

All mapped diesels don't smoke.

+1

To the point that even after a couple of weeks driving the INSIDE of the exhaust is still shiny stainless. (on a CR with DPF still fitted)

Boosting late to save clutch lol what a load off bull. I think people should stick too well know dpf removers ie shark etc.

So many cars are not mapped properly too by unknown tuners.

I think it's the driver that saves the clutch. Standard Vrs boosts early and if this was a problem Skoda wouldn't have it that way.

Such a tune would cost you fuel economy, power, clog up the DPF

The OP has had the DPF removed.

The OP has had the DPF removed.

Before the OP had the DPF removed it was clogging and had to regen every 30 miles. Which is what you expect with a dirty/smokey tune.

Edited 22 June, 201214 yr by Kiwibacon

Agree but a PD and a DPF is a bad combination.Only works well on the CR.

Before the OP had the DPF removed it was clogging and had to regen every 30 miles. Which is what you expect with a dirty/smokey tune.

Will you do me a favour and read all the posts. The DPF died due me doing stop start work (literally engine off, engine on every 30mins) some times for 10hours a day, if that does not kill a DPF then i dont know what will.

I took the car out for a proper run last night as one the way from the garage yesterday it was busy on the roads and not got chance to have a proper feel of the car, it pulls loads better from low down the revs, feels so much smoother, yes there is a big improvement there.

This is what you get with a CUSTOM map, i asked for how i wanted it, Shark, Revo and all other places like that will put on a generic map, how is that any good to me for the work my car does?

And by boosting late i dont mean back end of the rev range range, its pretty much where it normally is on a stage 0 but its abit more evident when there more oomph there, it just does not all come in one big lump sum which tbh a lazy tuner will do, the map needs to be linear and smooth.

And i think someone mentioned about not mapped not smoking...you have your DPF on? Mine didt smoke till i took it off. ALL DIESELS SMOKE!

Stop/start by itself doesn't kill a DPF.

All diesels don't smoke. When healthy and in good condition none of them do. Mine certainly don't, none of them are VAG but none have DPF's either. I tune/map them myself.

Smoke means you don't have enough air (boost) for the fuel you are trying to burn. Smoke is wasted fuel, wasted power and a sign that your combustion temperatures are getting dangerously hot. I run exhaust temperature gauges and tune to that. I hit dangerous temps long before I hit smoke.

Mine (1.9 PD BXE without DPF) smoked moderately/heavy, the exhaust side would get more covered in soot then the other side. After my stage 1 remap including EGR valve removal, I noticed both sides stayed clean. No more smoke!

Don't be confused into thinking that a custom map is better. Whilst it may better suit your needs it won't have undergone the rigourous testing that standard maps will have done.

All diesels smoke.

Especially if the turbo isn't boosting and you put your foot down. The car injects more fuel to get things going but because the turbo hasn't spun up yet there is some unburnt fuel passing though... smoke.

The reason you don't see it generally is a lot of cars now have DPF's.

Look at a Fabia vRS for instance. Even with a standard map they get a sooty boot due to the exhaust design.

Mine smokes but you don't notice so much because it has those exhausts that point down so most of it gets blasted at the road. A lot of cars have these type of exhausts on diesels.

With a map (even a very good one) the car will smoke slightly more. This is bound to happen as it is likely requesting more fuel to be injected than the standard map.

I completely agree that the DPF is totally not suitable for every car and should have been optional from the factory to not have it fitted. Why can't you own one of these cars just doing mainly town driving?

Sounds like a positive result anyway and cheaper/less hassle in the long run!

Phil

I completely agree that the DPF is totally not suitable for every car and should have been optional from the factory to not have it fitted. Why can't you own one of these cars just doing mainly town driving?

DPF equipped cars certainly will not suit everyone's style of driving.

But the reason DPF's are fitted are for a couple of reasons (at least) they cut the smoke out which means the car is less polluting, that then in turn leads to the car not producing carcinogenic fumes.

You may not care about the environment, but you should care about getting cancer especially if you can avoid it

All diesels smoke.

Especially if the turbo isn't boosting and you put your foot down. The car injects more fuel to get things going but because the turbo hasn't spun up yet there is some unburnt fuel passing though... smoke.

All EFI diesels monitor the air coming into the engine (MAF sensor) and use this to limit the amount of fuel injected. The main limiting map is the air/fuel calibration table, also known as the "smoke map".

The air/fuel ratios diesels run at can be as low as 80:1 at idle, as load increases and more fuel is injected the A/F ratio drops.

18:1 is the sort of max value you'll find on a stock car under steady load.

If you get down to 16:1 you'll start to see smoke no matter how good your injection system is. Some stock vehicles will approach this only in the transition to spool up the turbo quicker.

Some tuners put cars out with A/F ratios as low as 13:1. Now if that's a petrol, that's fine. On a diesel it's just sickening pollution. Going below stoich starts to cool the combustion and further reduces performance. It's a very bad thing to do.

There are a lot of tuners out there in the game because they are good with computers and are able to easily get a handle on map up/downloading. Not because they have any clue what is or isn't safe for a diesel engine.

Any tune that belches black smoke is junk. There are no exceptions to this. If you have a dity tune, you have a bad tune.

A good tuner knows how far they can push the factory turbo to deliver more air and how air/fuel calibration tables should be tweaked to maximise power and torque within the limits of the hardware while minimising smoke. Tuners who don't have a clue can do things like flatten smoke tables and punch up torque limiters across the board to let the engine dump in fuel which cannot be burnt and just gets dumped out the back.

On the way sooting up your oil and causing premature engine wear. Also producing internal temperatures which could melt your pistons to the bores if you subjected the engine to a sustained high load.

Are you thinking of this:

As this is not what im trying to get at. There is slight poof of smoke on every single diesel i have ever seen when the accelerator is put down, even brand new ones that have pretty much just rolled of the factory floor.

End of the day my car is healthy and custom maps are alot more common then what you think, it is specific to my car its just the map has been smoothed out, as a tuner you should this...

@Kiwibacon

I wasn't suggesting that it is normal for diesels to belch smoke out. More as Emma has said above... a little "poof" as you put your foot down... It's a nice little message to the tailgator as you leave the 30mph into an NSL and leave them for dead...

And Emma... if your car starts to smoke like that... then you need to worry! lol

Haha smog bomb!

This Kiwi man is not reading the posts and not catching half the story, either way my Octy is the fastest taxi in the East!

So glad I run on petrol!

my Octy is the fastest taxi in the East!

Are you Ernie's sister then??

Edited 22 June, 201214 yr by blackspaven

Haha smog bomb!

This Kiwi man is not reading the posts and not catching half the story, either way my Octy is the fastest taxi in the East!

So u do use ur Vrs for a taxi?

So glad I run on petrol!

So am I - although only until tomorrow (unless RBS still can't process/find my

Money)

So glad I run on petrol!

and me. But to the OP, any visible smoke on a modern High Pressure DI TD is baad news. DI is the industry solution to emissions of diesel kinds, a DPF can only be fitted to a low smoke emission engine so gives you and idea how far diesel tech has moved on. You can thank BMW mostly for that by sticking their noses out back in the late 90s.

and me. But to the OP, any visible smoke on a modern High Pressure DI TD is baad news. DI is the industry solution to emissions of diesel kinds, a DPF can only be fitted to a low smoke emission engine so gives you and idea how far diesel tech has moved on. You can thank BMW mostly for that by sticking their noses out back in the late 90s.

Right your all taking this a little too far :wonder: when i say smoke i mean viable exhaust gases with a dark tint to it, you lot thinking im meaing the picture above.

DPF on; no smoke DPF off smoke will come out...this is inevitable!

If my phone will decide to work then ill upload video of mine, the camera catches some exhaust gases been emitted, its not far from this on full throttle!