How do you eco-drive a diesel ?

[ConnClark]

Originally Posted by Piwoslaw

In my diesel I start to feel the turbo in the 2100-2400 rpm range, but I hardly ever get into that range (never when ecodriving). I doubt whether the turbo helps in the 1400-1800 rpm range?


Hmm, maybe it's about time I unblocked it first? Then I'll see if it needs cleaning. If only I could find the time to make a temperature-controled grill block, then I wouldn't be worried about how much to (un)block depending on the weather.

Please unblock your intercooler. Your car will use less fuel and you will generate far less NOx and your engine will last longer.

A warm air intake does nothing good on a diesel.

http://ecomodder.com/forum/showthrea...html#post94488

[tasdrouille]

If you are eco driving your diesel passenger car, chances are your IAT will be exactly the same whether cross flow to your inter cooler is blocked or not. On my TDI it is blocked and the IAT is exactly the same but when I floor it for extended periods of time.

[consaka]

Originally Posted by ConnClark

Boost pressure does not increase fuel. It does allow the injection system to inject more fuel if you have the petal floored. A turbocharger does however get its power from the energy not recovered by the piston. You are correct in that trying to drive with a low amount of boost is an indication of the piston extracting as much power as it can. This does not mean that you should try to prevent your turbo from creating boost via modifications. Boost actually increases the efficiency of a diesel engine by promoting more complete combustion and more heat energy going into the working fluid and less heat energy being lost to the engine block.

The relationship between boost and fuel actually differs depending on the age of the vehicle. Older vehicles took whatever boost they could get. You can have more boost then you actually needed or too little and you would get black smoke. For economy purposes black smoke is verrr bad. Today all these diesels are computer controlled which means the computer will allow fuel to be injected based on what the boost is. This is one reason you so seldom see black smoke pouring out of a new stock diesel. If you do see smoke on a new diesel something is wrong. Either its been chipped, is broken or otherwise modified. Driving with low boost simply means you are driving with less fuel. When I am cruising at freeway speeds I probably am running 3 to 5 lbs of boost BUT I am not necessarily needing that boost so it just adds to my efficiency. BTW my rig is NOT computer controlled but if I drive like it is then I still dont get black smoke. On the other hand I have black smoke on demand.

[consaka]

Originally Posted by ConnClark

Please unblock your intercooler. Your car will use less fuel and you will generate far less NOx and your engine will last longer.

A warm air intake does nothing good on a diesel.

http://ecomodder.com/forum/showthrea...html#post94488

I agree 100% In fact the opposite is probably true. If you could cool the incoming air down even more without loading the engine more you would probably see better numbers.

[Vekke]

I think also that it is better to have the intercooler open. If you tend to drive even little faster that normally/usually do your intake temperatures will start to rise quite rapidly as I noticed when my nose were fully closed...

[caissiel]

If you block the intercooler your EGR Valve might not open as much, I think the fuel economy is from the EGR being closed earlier due to faster warm up. On my Ford 6.0L I feel that the EGR valve causes terrible fuel milage on warm up.

Also I find that Diesel tend to be much more efficient on accelaration then Gas Engines.

I have a 6 Spd Standard and a ScangaugeII, I found that the the RPM for shifting is from 2000-2250 and I drive at 1750 RPM 55MPH for best Milage. I never use O-Drive in the city because I shift to O-Drive at 45-50MPH. My Scan Gauge indicates lower Milage when I lug the gears at 1200-1400 RPM. So there is no one beeping to pass me in town I usualy I'm the one slowing down for others. I do slow down using the Highest gear due to engine going to 0 L/100. With a 10000 Lbs 5Th Wheel I do 20L/100 and drive 55-60 MPH. Empty I do 12L/100 Combined. So the translation I use is 282/20 = 14.1 MPimpG and 282/12 = 23.5 MPimpG for americans its 235/20 = 11.75 MPusG and 235/12 = 19.6 MPusG Ford test these trucks at 17 MPusG for fuel complaints.

Enough Info but most of my driving is done while trying to keep the scangaugeII indicator at 10-12 L/100 normal, and at 18-20 L/100 with the trailer.

[Piwoslaw]

Intercooler block question: Should it be open always, or would blocking it during warm-up be better? I'm starting to plan my new openable grill block, and instead of one opening for when the coolant gets hot, maybe I should add a second for the IC, which opens when the coolant starts to get warm?

[Vekke]

In warm up the best solution would be no intercooler. I had the same idea for next front bumber verison...

When your engine temperatures start to rise and you dont have grille which you can open from the cabin. There two solutions:

1. Drive slower, good for mpg
2. turn you central air blower to the max rpms, bad for mpg. If temperatures still rise you have to put the blowing temperature to max warm position even if it freaking hot in the car already. Temperatures will go down in the engine but up in the cabin .

That is the reason why I will build remote controlled grill block...

[Piwoslaw]

Funny thing is that with my grill block my temp gets up to 90*C and above, but the fan has never turned on (I have this car since October 2008). But when I turn on the A/C, the fan comes on until the temperature drops to 80*C. I guess it's the electronics. Now that it's warm, and I haven't had time to get under the car and redo the block, I have turned on the A/C on 1-2 occasions in a traffic jam. I still haven't checked when my fan turns on without A/C. According to the Peugeot Klub Polska Forum, first speed is at 95*C and second speed at 105*C.

[Vekke]

I dont have A/C on my car. My cars temperatures are around 95 celsius in normal driving in winter and summer. But now when its warm if I drive 130 km/h my temps start to rise. And my interior blower is also manual...

Can you hear you fan during driving? I cant. I should also put light like was it basjoos did...

And I was talking about the interior blower not the blower in engine compartment which begins to blow but temperatures still rise in my case :/