A work in progress. - Page 21 - Fuel Economy, Hypermiling, EcoModding News and Forum

Arragonis · 06-25-2011, 05:02 AM

Quote:

Originally Posted by euromodder

I'm afraid it's very widespread.

If the Fester 1.6 TDCi engine the same as yours, it has 90hp. This was on my list but pretty much all of the Diesels I have looked at have a DPF.

euromodder · 06-25-2011, 06:09 AM

Quote:

Originally Posted by Arragonis

If the Fester 1.6 TDCi engine the same as yours, it has 90hp. This was on my list but pretty much all of the Diesels I have looked at have a DPF.

It's the same engine, but derated.
Peugeot/Citroen also had (have ?) them with 90HP.

For the short trips you said you're mostly doing, I'd advise against a diesel, and definitely against a diesel with DPF.

Most likely, I won't be buying another diesel despite doing 15-19.000 miles/year.

Arragonis · 06-25-2011, 07:25 AM

Yep, moving away from the idea at the moment. If Mrs A approves her Prius boot is large enough then an Aygo / or new Picanto is probably going to be on the Arragonis Towers driveway...

euromodder · 06-27-2011, 06:11 AM

Coming home from work last night, I filled up the replacement S40 as I expect to get my own car back later this week.

I beat 4L/100km by a hair:
3.9993 L/100km = 25.0045 km/L = 58.81 mpg(US) ;-)

Now why doesn't my wagon get that kind of mileage

It can't be just the 0.01 difference in Cd, can it ?
S40 : 0,31
V50 : 0,32
A = 2.20 m2 (both)

I've added the Cd values to the Wikipedia Cd-page.
Source:
Volvo S40 History
Volvo V50 Background

euromodder · 06-27-2011, 06:22 AM

Quote:

Originally Posted by Diesel_Dave

Actually, the issue isn't that biodiesel doesn't BURN as easily. The issue is that biodiesel doesn't EVAPORATE as easily.

My understanding was that the less volatile biodiesel condenses more easily than straight diesel, and then gets scraped into the oil.

Quote:

The issue is that quite a bit of conventional diesel will evaporate out on it's own, biodiesel won't go OUT of the oil.

That's for sure.
Once the BD is in the oil, it ain't coming out again.

Despite the 5% BD in our regular diesel fuel, the BD made up 22% of the fuel in the oil !

Piwoslaw · 06-29-2011, 10:20 AM

Quote:

Originally Posted by euromodder

Coming home from work, I couldn't resist filling up Snert, the replacement S40.
4.08 L/100km or 24.5 km/liter
57.66 mpg (US)
69.24 mpg (UK)

Instant Hypermiler status !

I noticed you put Snert into your garage. Any news on Hägar's health? Do you miss him?

How often did the S40 go through DPF regen cycles, compared to your V50?

Quote:

Originally Posted by Arragonis

I found this just now, checking out Vauxhalls for someone.

Quote:

With the 1.3CDTI (FIAT 1.25 Multijet) engine fitted with a diesel particulate filter, what can happen is that excess diesel fuel that was supposed to burn hotter and regenerate the dpf does not and instead seeps into the sump, gradually raising the level of sump oil to the point that the engine starts to run on it, cannot be stopped and therefore self-destructs. Vital to check sump oil level regularly.

Different engine, same problem though ?

I heard somewhere that PSA's HDi turbodiesels aren't prone to going out of control, but Renault on the other hand is supposedly notorious... Just a rumor, though.

euromodder · 06-29-2011, 06:06 PM

Quote:

Originally Posted by Piwoslaw

I noticed you put Snert into your garage.

Did you see the fuel log ?

Its engine is obviously in better shape than mine - despite the obvious fact that the S40 has has a hard life.
It gets better FE in all conditions except cold starts - that's the effect of the lightweight oils in mine. With a few tweaks, I can see this car consistently returning under 4 L/100km (better than 59mpg).

Quote:

Any news on Hägar's health? Do you miss him?

The airco on the S40 isn't working properly, and it's been a sweltering 33°C , so yes, I miss Hägar a bit

Hägar reportedly has an issue with excessive EGR - though the EGR-valve has already been replaced under warranty early in its life to (not) cure a bucking problem while regenerating the DPF.

Too much EGR will also reduce power on partial load, which is what I felt right away, and what I've been seeing on slight inclines where Hägar dumps in far more extra fuel than the S40 - wether it's on CC or not.
Snert responds a lot better to switching off the CC uphill as well.

Quote:

How often did the S40 go through DPF regen cycles, compared to your V50?

After 200km , 240km , and 280 km.It's about due for another cycle.

It's easy to miss it happening on the S40 though, as the regen is really smooth and almost unnoticeable compared to my V50 - Only the SG shows it happening.

euromodder · 06-30-2011, 02:33 PM

The replacement S40 is going back to the dealer on Friday.
4.05 L/100km - 58.1 mpg(US) - puts it in 6th place out of 153 Volvo's on Spritmonitor.de .
Not bad, considering this was achieved during regular commuting, in the original version of this car rather than with the later Drive/eco versions.

The tires are returned to their previous flat condition - 36psi / 2.5bar .
Feels very soft and weird

I'm curious as to what other problems they've found with Hägar, and wether he's finally cured or not.

Piwoslaw · 07-01-2011, 05:40 AM

Quote:

Originally Posted by euromodder

Hägar reportedly has an issue with excessive EGR - though the EGR-valve has already been replaced under warranty early in its life to (not) cure a bucking problem while regenerating the DPF.

Too much EGR will also reduce power on partial load, which is what I felt right away, and what I've been seeing on slight inclines where Hägar dumps in far more extra fuel than the S40 - wether it's on CC or not.
Snert responds a lot better to switching off the CC uphill as well.

I just found a research paper which claims that too much EGR in a diesel will lower exhaust temperatures, resulting in lower NOx but also increased PM. This may explain why your DPF kept going into regen. My guess is that this should have shown up on emissions tests as the NOx would have been lower than usual, though nobody would have known. Also (not sure about this), the EGR valve may have a feedback signal as to how 'open' it is, allowing the ECU to compensate, and allowing the diagnostic to notice that something is wrong. On the other hand, the ECU may be sending a faulty signal to the EGR valve, making it open too much. So much for my armchair diagnostics

I'm paying close attention, since this may effect my engine also, though without the FAP problems. I do hope that they get this permanently sorted out so that you can start getting Snert-ish milage

euromodder · 07-01-2011, 01:18 PM

The S40 will have to soldier on for a few more days.
My V50 isn't ready yet.

They're also going to replace the DPF - again - but fortunately not on my bill

Leaks were found in the air intake path, 1 before, 1 aft of the turbo due to small tears in the tubing. What wasn't replaced was cleaned out, as it was covered with oil (common on HDi's because of crankcase venting) .

Air filter (6.000km old) and air mass probe were replaced as oil had gotten onto it - tilting the tube coming from the air filter the wrong way during servicing, will get oil onto both.

I'll get Hägar back on Monday.