it was not the 300Tdi but the 200Tdi that was tuned slightly lower on
Defenders (107 bhp instead of 111 bhp on Discos) but that was on the first
years of production of this engine.
Then it was tuned for the same power output and when the 300Tdi was
introduced in 1995 it was tuned for the same power and torque output on both
Discos and Defenders.
The introduction of an automatic gearbox on Discovery vehicles also saw the
application of a slightly more powerful engine variant of the 300Tdi (122 or
124 bhp if I remember well) which was also fitted with the electronicaly
regulated fuel pump and this additional power (and torque) came from
different tuning of the module so as to compensate for the power that an
automatic gearbox robs from the engine unless the torque converter is fully
The problem with your fuel pump may be due to different (not so succesful)
setting of the timing of the pump relative to the engine.
Or maybe your pump needs to be "tweaked" either by turning the diaphragm, or
the torx bolt on its head or the rear screw.
Hope this helps.
"Graham Carter" <email@example.com> wrote in message
> Hi folks,
> I know that the 300 Tdi engine is tuned differently in the Defender and
> Discovry - it produces about 10% less power inhe Defender.
> Is this done by a different injection pump, or are the fuelling settings
> different? Or something else completely different?
> The reason I ask is that I have just had my injector pump rebuilt, and teh
> car seems to be lacking performance. I was wondering if the pump had been
> set up incorrectly after the rebuild?
> Incidentally, inital problem at first was sticking fuel coff solenoid, but
> when my mechanic took the solenoid out, he found chunks of metal. When
> repaired the injector, they gave me the cam disc and rollers, and it
> like someone had been hitting them with a hammer! It's amazing the car
> going. Says a lot for the reliability of the 300Tdi. The pump got
> by a load of fuel out of some drums (can't get fuel at service stations
> in Zimbabwe), which were comtaminated with water. Both sedimenter and
> fuel filter were full of water at one stage, and injector pump also had
> quite a lot - car didn't run very well at that time!
> Anyway, be interested in your comments on difference between Disco and
> Defender tuning.
> Graham Carter