A work in progress.

[Piwoslaw]

Maybe I'll stop trying to upgrade little bits and pieces with newer stuff and just swap the whole damn engine?! Ah, but then I'd probably like to downsize to 1.3-1.4...

[Piwoslaw]

How is Hägar doing? When the shop was looking for problems did they do a compression test? I'm researching crankcase ventilation at the moment and I read that one of the symptoms of excessive blow-by can be fuel in the crankcase oil. One forum claimed that if you can feel air being pumped when the oil cap is open, then the cylinders have blow-by, but another forum said that this is normal in HDi engines.

[euromodder]

Originally Posted by Piwoslaw

How is Hägar doing?

He's still high on oil, but going to the Volvo doctor next Tuesday, and is expected be hospitalized for a whole week.

When the shop was looking for problems did they do a compression test?

Not that I know of.
Doesn't feel like it's got compression issues.

Late last year on the Autobahn, it still went as fast as it's ever gone - 187 kph.
Still has the usual power when you step on it in the right powerband.
And I just pulled off a record tank

I'm researching crankcase ventilation at the moment and I read that one of the symptoms of excessive blow-by can be fuel in the crankcase oil.

Have you got venting issues with your Poogie ?

Where is the crankcase vent going to - into the intake to burn the fumes ?

[Piwoslaw]

Originally Posted by euromodder

Have you got venting issues with your Poogie ?

Probably not, since I can't complain about fuel consumption nor performance. But I did read up a bit to see if I should be worried about oil in the intake. Everybody at my local Peugeot forum says that's typical of HDi engines, but I am contemplating adding a small jar to separate the oil from the air, to see how much it actually is. No low oil problems, though, so I guess I shouldn't worry. I do get a boost pressure sensor failure code while pulsing on long trips which may be caused by oil clogging that sensor for a moment (in my case it is after the turbo and intercooler, I see a lot of oil spilling out of the ducting).

Originally Posted by euromodder

Where is the crankcase vent going to - into the intake to burn the fumes ?

That is standard procedure in today's engines, though Wikipedia claims that most modern diesels vent to the outside atmosphere. Not the case with PSA's diesels. Here's a picture of my intake:

This is after the air filter and air mass/temperature sensor but before the turbo. Under the round cap on top of the engine is a rubber membrane which is supposed to hold oil back. Some claim that a bit of oil in the intake air is OK since it lubricates the turbo, but has been know to cause caking on the turbo's blades if the engine is killed while hot (this was a problem with PSA's 1.9TD, but not with newer HDi's).

[euromodder]

Yesterday morning I brought in my V50 for a more extensive check-out of its diesel particulate filter system.

I got a 1.6L Diesel S40 as exchange vehicle - the sedan version of my station wagon / break.
It's a year younger than mine, MY 2007, has 55.000km less on the clocks, though it has clearly had a harder life.
195/65/15 tires instead of my 205/55/16 ones.

Despite riding soft on flat (2.5 bar / 36psi) tires, despite the bigger mirrors, despite the older Michelin Energy (not Energy Saver) tires at the back, and despite not coasting it at first ... it's getting better mileage than my V50 all across the board !

It pulls better overall, and picks up better @ low rpm.

It's also painfully clear than the shocks on my V50 need replacing.
The S40 feels far more planted than my car, even on the soft tyres.


I've increased the tyre pressure to sidewall max, 3.5bar / 51psi and will be driving it like I drive my own car to see what it'll do.

[Piwoslaw]

Wow!

Here's what I'm guessing:

• Your V50 has more problems than you suspected.
• The S40 is lighter and/or has better CdA.
• It has a slightly newer version of the lump and/or ECU.
• Are the gearboxes exactly the same?

Tell the service station crew about how big the difference is and ask why that could be. Maybe you could trade?

[Arragonis]

What is the difference in weight between a V50 and an S40 these days ? Glass weighs a lot so the difference between the S/V70 used to be loads.

[euromodder]

Originally Posted by Arragonis

What is the difference in weight between a V50 and an S40 these days ?

According to the online spec sheets : 9 kg / 20 lbs in favor of the S40.
That's not going to give a readily measurable difference - I've removed about 4 times that much from the V50.

Originally Posted by Piwoslaw

Wow!
Your V50 has more problems than you suspected.

Yeah. Great.
At the very least it has confirmed that the shocks are due for replacement.

[*]The S40 is lighter and/or has better CdA.

The rear line on the S40 is pretty well streamlined, but fuel economy is officially only 0,1 L/100km lower / 1mpg higher on the S40.
Later versions have identical official FE numbers.

S40


Compared to V50

It has a slightly newer version of the lump and/or ECU.

That's a possibility, though the V50's ECU software has also been upgraded now and then.

Are the gearboxes exactly the same?

Looks like it, I'm getting the same rpm at the same speeds.
I'll copy the CoC pages though and check when I get my own car back.

Tell the service station crew about how big the difference is and ask why that could be.

Will do.

Maybe you could trade?

The trunk opening is so small I really don't want an S40
That was the main reason for not buying one back in 2005.

[Arragonis]

Maybe its better run-in than yours. Start a second career minicabbing with a partner (24 hour cover than way, it will never get cold) for a couple of months and then at maybe 300k km it will feel just as loose

[Piwoslaw]

Originally Posted by euromodder

S40


Compared to V50

Well those pictures reveal the problem: The S40's roof is more or less parallel to the airflow lines, but the V50's roof is perpendicular to them!! No wonder the S40 feels like it has less frontal area

Originally Posted by euromodder

That's a possibility, though the V50's ECU software has also been upgraded now and then.

Maybe the ECU upgrade isn't enough if the newer engine has an upgraded part, for example slightly better injectors. I wonder what effect I'd see if the intake air temperature sensor was after the intercooler (newer models with air doser) instead of before the turbo?

There is also the possibility that whatever you are using to see FE is miscalibrated. The Scan Gauge may need a few tanks in the S40 to get used to it, while the onboard computers are far from accurate. The local Pug forum says that the same model, with the exact same engine, can see up to 2l/100km difference on the OBC, and there is no way to calibrate it. Mine is usually 0.5l/100km off, which is good enough for government work, as my Step Dad says.