300TDi - ECU or All Mechanical ??!?

[dborg01]

Just wanted to know how many around have 300TDi engines with ECU and fly-by-wire and how many have it mechanically controlled.......well, anyone who can identify one from the other obviously!;)

Just let us know some basic details about your vehicle if you post your answer:)

Cheers
Daniel;)

[turbine_2]

IIRC
300TDi with manual gearbox = mechanical
300TDi with auto gearbox = ECU
They may have palyed around toward the end of the 300 series run on the ES spec models I guess so that they could have cruise control but don't know for sure, probably not as the 300TDi continued into the MoD defender for longer.

[dborg01]

mists are clearing........:rolleyes:

Daniel

[NomadABC]

The cruise control on my last auto Tdi was mechanical, even though the engine had an ECU. It's probably for this reason it was hopeless:(

[bilge rat]

as far as i know the mechanical, are cable operated throttle to the derv pump. the fly be wire is as it says no cable throttle potensiometer at the pedal then signal to ecu etc. alan......

[dborg01]

Yeh you could say that.....but first you have to know what a derv pump and a potentiometer are.......or should that knowledge be compulsory with owning a Land Rover??!?:rolleyes:

Ok, then while at it, can anyone with a 300TDi give mileage-to-fuel figures maybe we can compare between the mechanical and the ECU controlled 300TDi?

Cheers
Daniel.....from a very hot Malta;)

[bilge rat]

think theres a thread on fuell consumption somewhere, but mine does on average about 30 miles to a gallon which im well pleased with and the fact that i blanked the egr valve and tweeked the pump slightly. mines a non ecu one. alan.......

[turbine_2]

The cruise control on my last auto Tdi was mechanical, even though the engine had an ECU. It's probably for this reason it was hopeless:(

I've been racking my brain over this for a couple of days now and I don't get it. What's the difference between a mechanical cruise control and a, er, non mechanical one?

The only cc I am aware of is one that has a vacuum hose that pulls the throttle pedal forward or releases it depending on the variance between the required speed and the actual speed. The only other thing I can think of is if rather than using vacuum the system used a servo to pull the throttle instead but that's still mechanical (unless the newer ones don't have a butterfly valve in the air intake and it's all done through injection volume?)

[dborg01]

Hi turbine 2,
Maybe I can help you out a bit. The modern cars including the Auto Gearbox 300TDi and all LR models from TD5 onwards don't have a cable attached from the throttle pedal to the fuel pump anymore. Instead they have an electronic system that detects the position of the pedal and opens or closes fuel accordingly. This system is usually called fly-by -wire because it was first devised in Aerospace technology, although it should be rightly called - drive-by-wire and was originally adopted into automotive by F1 and heavy-vehicles.

Thus a cruise control can be made to work electronically by telling your car to 'memorise' a certain pedal press. This CC will be overidden either by manually switching off or by pressing any of the other pedals, which in turn have switches connected to send a signal that clutch, break or even throttle has been pressed.

The throttle was the first drive-by-wire system to be 'on the road' but nowadays there are companies like ours who also developed such systems for the clutch and brake and now also for a sterring system!!

Cheers
Daniel

[turbine_2]

Ah, I thought that the vacuum operated throttle cc still had a cable to the throttly body butterfly. This is where I'm going wrong.

Some of the newer stuff on cc is really cool, I like the sound of the new Mercades system that sets speed according to the distance to the car in front (although I can see some gotchas in that). Not quite sure I'm ready yet for cc steering though.

[dborg01]

This is were it gets funny......we are all eager to fly in planes having nothing but fly-by-wire, but we are not ready to go that way in cars.....well, me included;)


Back on the thread topic, I checked my consumption, and it's currently at 24mpg. Not much really:( It's a Disco 300TDi engine fitted on a 109" SIIA Hybrid. Maybe that's part of the explanation for such poor mileage!

Nice weekend mates!
Daniel;)

[Jon v8]

The first year of production 300Tdi auto's were not EDC controlled,they had a standard mechanically governed VE pump.From 1996,(Ta chassis no ) they then had the EDC pump - these do not have a throttle cable that goes to the pump,it has a cable going up to the inner rh wing to operate the kickdown for the autobox and has an attachment to the cruise vac servo.(if fitted)
The pre EDC auto's could be a bit flat,some were ok tho - but alot better when EDC.Shame most of them are getting knackered now as they are darned good trucks.

[HarryD]

Just wanted to know how many around have 300TDi engines with ECU and fly-by-wire and how many have it mechanically controlled.......well, anyone who can identify one from the other obviously!;)

Just let us know some basic details about your vehicle if you post your answer:)

Cheers
Daniel;)

No ECU fitted on my 1994 (95 model) ES 300Tdi, it's all mechanical. Had ordered a "Tunit" module expecting there to be an ECU to attach it to....but...nope.
Tunit were good in taking it back, but....I should have checked first.

[manthing]

just to muddy the waters a little more
The 300 auto got a power upgrade around P reg
you can feel it as well