Evening guys,

 

I have a 15 plate Octavia 2l 150Bhp 75000 miles, with a recent stage 1 being done. I've noticed that short drives are much more generous with the consumptions, however motorway driving is horrific. 

 

When I bought the car, I took it down to Wales from Ayrshire, and on the drive down, I was getting 65mpg on economy.  Last weekend there, went down to Newcastle, again on economy, and being sensible it just scraped by 52mpg. 

 

I noticed that it was sitting about 2500rpm right down the motorway and my idle speed is currently sitting at around 900rpm which I think is slightly high. 

 

Spoke with the tuner and he suggested doing an dpf regen as it might be sooted up, or might be at the end of it's life.

 

Anyone experience similar?

If you are regularly doing long trips you won't need a regen. It's certainly possible that you are close to life on the dpf if it wasn't driven very well (short journeys) prior to your ownership. 75k isn't overly long for a dpf. I think they should last well north of 100k. Especially if driven correctly.

11 minutes ago, MarkyG82 said:

If you are regularly doing long trips you won't need a regen. It's certainly possible that you are close to life on the dpf if it wasn't driven very well (short journeys) prior to your ownership. 75k isn't overly long for a dpf. I think they should last well north of 100k. Especially if driven correctly.

 

Don't generally do trips like that tbh, Only on the odd occasion. Sometimes some local driving, or within 10 15 miles of home

Correct, in the scenario you describe the DPF will not need a regen but unfortunately if it has had the emissions fix the software will make it have one as the "calculated soot load" will continue rising regardless of the constant passive regens.

 

I suspected this was the case comparing my VCDS readings with my neighbours Octavia (same engine) which has not had the emissions fix, I now know for sure that I was right after paying to have my ECU software rolled back.

 

I would leave for a 500 mile motorway journey towing well beyond the permitted weight limit, miles of full throttle uphill sections in intermediate gears, during which it would regen several times and as soon as I arrived it would try again, problem being that while at my destination I was commuting 20km each way which was never enough to get up to temp and complete the regen it was trying to force despite the measured soot level being close to zero (calculated was at the 22.5g threshold) every journey the fans would be running at the end.

 

It was ridiculous that I had driven 500 miles at double the usual engine load (and fuel consumption) and was forced to continue driving after a 20km commute to allow the DPF to regen when it didn't need to only for it to start again within 3 or 4 days.

 

I now do a minimum of 800kms between regens and that is on short local journeys and have never since heard the fans running at shut down.

Aye, I agree that it shouldn't be the DPF, especially after the run to newcastle and back should have been enough at an almost constant 2500rpm. 

 

It was more the vast drop in MPG that scunnered me, and I could understand if I was trying to get down there in record time haha, but I was behaving myself.

1 hour ago, J.R. said:

Correct, in the scenario you describe the DPF will not need a regen but unfortunately if it has had the emissions fix the software will make it have one as the "calculated soot load" will continue rising regardless of the constant passive regens.

 

 

2105 150 TDI will be fitted with EA288 engine which was not subject to the 'Emissions Fix' that was applied to its predecessor EA189.