more mpg out of a 2.5?

Datatek said:

I think your name tag says it all

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Again we concur.

Seriously .
44mpg was what it did.

I was amazed myself?

Had the car for 3 years and it averaged 31 mpg. thats driving around a hilly south yorks and up and down the m1 everyday to work and back.

I guess i just had a good car unlike some of you guys! lol

wammers said:

What do you mean surprising i would say. Fooking amazing. Hope does not tell Land Rover/BMW they will want it back to strip and anylise it.

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:blabla::blabla::blabla::blabla::blabla::blabla::blabla::blabla:

lol

how much do you think it will be worth ?

best get it back from those pikeys i sold it to.

And there i was thinking all manual 2.5 dse had good mpg.

obviously i was wrong and you lot cant pass a petrol pump without filling up.
pmsl

Thats Bollocks said:

:blabla::blabla::blabla::blabla::blabla::blabla::blabla::blabla:

lol

how much do you think it will be worth ?

best get it back from those pikeys i sold it to.

And there i was thinking all manual 2.5 dse had good mpg.

obviously i was wrong and you lot cant pass a petrol pump without filling up.
pmsl

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If you drive a manual like a nun, yes you will get a lot better fuel mileage than in any auto. Autos around a hilly town and in stop start traffic drink fuel for fun. Specially if they are chipped and you like to use the power.

I do drive like a nun.
lol

thank you for your input mother superior,if youve had it chipped then there is only one way to drive it Wammer.any ideas on my 4.4 vogue post?

tomcat59alan said:

thank you for your input mother superior,if youve had it chipped then there is only one way to drive it Wammer.any ideas on my 4.4 vogue post?

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?
the reason for chipping is not to drive a 4x4 like a sports car! if so then buy a bloody porche.
the reason for chipping is to provide a smoother torque curve and more horsepower .

If like most people you use a 4x4 to tow then having it chipped helps you pull away on hills without having to use the low box when dragging 3 ton from a dead start.

Also having it chipped means you are les likely to rev the bollocks of the vehicle trying to get 2.5 ton of car up to speed, thus saving on fuel.:doh:

if ya wanna go fast, buy a ****ing Fireblade.

wammers said:

Think OP i answered was talking now, not twelve months ago so maths are near enough. Chips inject more fuel, simple as that, they do nothing to the turbo. The only thing that controls that is exhaust gas flow. The higher the engine revs the faster the turbo spins, that's the way it is. They do work, but if you use the power you use more fuel, it is that easy. Perpetual motion machines are not a possibility, some read the bumf and think they are. The P38 is a gas guzzler at 30 mph, drinks fuel in traffic stop and start, only comes into it's own on the motorway or on long trips. If i drove mine up and down motorways all the time i would be seeing the high twenties low thirties, but around town if i use the power the chip gives i can see 14 mpg without any trouble.

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I have to dissagree with the Only Fuel statement pretty strongly. I can't speak for a power box on a P38 as I have never fitted one, but a remap on a turbo diesel works in the following way.

The ECU controls all elements we are talking about. Fuel, boost pressure and turbo initiating settings.

The remap does the following. lowers the initial turbo 'switch on' by somewhere between 2 and 500 revs, model depending.

on a variable speed turbo, such as on the X5, it increases the turbo spin rate for a given revs, probably mostly as a direct result of initiating it sooner.

increases the peak boost level achievable, to match the additional fuel being fed.

By simply throwing more diesel into the cylinders you would not achieve the the power gains you can get.

Now, it may be different using an inline power box, that I don't know, but a true ECU remap done on a rolling road like Evolve Automotive do does more than just fuel.

Takson said:

I have to dissagree with the Only Fuel statement pretty strongly. I can't speak for a power box on a P38 as I have never fitted one, but a remap on a turbo diesel works in the following way.

The ECU controls all elements we are talking about. Fuel, boost pressure and turbo initiating settings.

The remap does the following. lowers the initial turbo 'switch on' by somewhere between 2 and 500 revs, model depending.

on a variable speed turbo, such as on the X5, it increases the turbo spin rate for a given revs, probably mostly as a direct result of initiating it sooner.

increases the peak boost level achievable, to match the additional fuel being fed.

By simply throwing more diesel into the cylinders you would not achieve the the power gains you can get.

Now, it may be different using an inline power box, that I don't know, but a true ECU remap done on a rolling road like Evolve Automotive do does more than just fuel.

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I am talking a P38 here. The turbo boost is mechanical, the only link from turbo to ECU is via the MAP sensor. I don't really care what happens in an X5. What you say above is misleading in the context of this forum, it simply does not happen on the P38. My statement was correct in relation to what interests this forum, this is a Land Rover forum not a BMW forum. Think you read to many books. Are you a mechanic or an enthusiastic amatuer?

Tony, as ever, has connected the business end of the impaction implement firmly onto the topmost section of the narrow, pointed shaft, to pierce the objective, with the minimum of prevarication. Could almost qualify as a carpenter....and restrained enough this evening to be a diplomat...almost..

gtland said:

Tony, as ever, has connected the business end of the impaction implement firmly onto the topmost section of the narrow, pointed shaft, to pierce the objective, with the minimum of prevarication. Could almost qualify as a carpenter....and restrained enough this evening to be a diplomat...almost..

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We do try hard you know.

wammers said:

I am talking a P38 here. The turbo boost is mechanical, the only link from turbo to ECU is via the MAP sensor. I don't really care what happens in an X5. What you say above is misleading in the context of this forum, it simply does not happen on the P38. My statement was correct in relation to what interests this forum, this is a Land Rover forum not a BMW forum. Think you read to many books. Are you a mechanic or an enthusiastic amatuer?

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Right on the money as usual Tony

wammers said:

...the only way to increase torque and power output on a unmodified diesel engine, is to inject more fuel.....

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Or a different fuel!

Which makes me wonder why no one has mentioned LPG yet.

Has anyone fitted a LPG to their diesel?
The trucks down here do it and fuel economy and power also increase.

kzrocky said:

Or a different fuel!

Which makes me wonder why no one has mentioned LPG yet.

Has anyone fitted a LPG to their diesel?
The trucks down here do it and fuel economy and power also increase.

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Yes i believe London transport have experimented with it. But it is not an approved method for general use over here at the moment. The government make too much money from fuel duty to introduce anything that helps you use less.

you dont arf get them on here.If I want to tear the bollocks off something I use the xjr or the x type indy.The chipped p38 i use for towing the 1800 kg tin tent,and it still shows a clean pair of heel to most on the road.:brick:

i have fitted lpg to my rangie.(3yrs ago)..but its a classic (manual)and running a nissan patrol 3.3l 6 pot turbo diesel...all mechanical injection..ie no ecu..

it worked wonders for power and economy (if driven for)..though of course one has to take into account install cost and lpg costs,(400miles+ per 30 litres)

though i installed for power not economy..

Have not gone into this very much but as i understand it it is not possible to run a diesel off LPG alone. This is because LPG does not compression ignite. There has to be diesel injected to initiate the burn. Just blowing a little LPG into the manifold is basically just adding more fuel to get more power. It is just that as the LPG is a clean burner you don't get the clouds of black smoke you would get by injecting more diesel for the same power gain. Throwing a bit of LPG in is one thing, getting a diesel to run off it in it's own right is quite a different proposition.

Thats Bollocks said:

?
the reason for chipping is not to drive a 4x4 like a sports car! if so then buy a bloody porche.
the reason for chipping is to provide a smoother torque curve and more horsepower .

If like most people you use a 4x4 to tow then having it chipped helps you pull away on hills without having to use the low box when dragging 3 ton from a dead start.

Also having it chipped means you are les likely to rev the bollocks of the vehicle trying to get 2.5 ton of car up to speed, thus saving on fuel.:doh:

if ya wanna go fast, buy a ****ing Fireblade.

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the downside to having it chipped is it puts more strain on other components ie the gearbox.

adding lpg to the burn helps burn the diesel quicker and more complete..(as far as i know)..thus realising more power and "cleaning up" the burn..as well as adding a tiny bit extra with the lpg thats burnt.

ie reduces the black smoke if you have any..now this means that you can add more fuel too before the black smoke appears (assuming you have none to start with)

it also reduces the egt..(as seen on my gauge)

its like when on having a 7 pot diesel instead of 6(power wise)

also on a steady run at 65-70 on 31 tyres,1:1 transferbox gives an average of 35+mpg combined diesl and gas...

i am however sure results on a modern ecu controlled engine would be noway as good,because the engine of course would already be much more efficient than my old mechanicall goverened lump..having said that though,when the old boy rusts away i will be fitting same lpg unit to whatever i get next...

p.s. engine is old nissan sd33(6 pot ohv) 2 bar boost intercooled etc...

p.p.s..cant run diesel on 100% lpg,though you can on hydrogen..ie buses and trucks are now,here in the uk..

wammers said:

I am talking a P38 here. The turbo boost is mechanical, the only link from turbo to ECU is via the MAP sensor. I don't really care what happens in an X5. What you say above is misleading in the context of this forum, it simply does not happen on the P38. My statement was correct in relation to what interests this forum, this is a Land Rover forum not a BMW forum. Think you read to many books. Are you a mechanic or an enthusiastic amatuer?

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Enthusiastic amateur through and through, but I spent a lot of time researching before I did any of them.

I get your point on being different on a P38, hence I was so specific about what it did to a specific vehicle. Thanks for clarifying for me.

Quick question though. If they have nothing to do with BMWs, why does my engine have it stamped all over it?