[ROVERNET - UK] 4.6 SD1

[Robert Thornton]

Kent wrote:
>Most Range Rovers from '89 to '95 and early Discos.  The 14CUX can be
configured to run with >or without Lambda Sensors.  Various Eproms were
used in different vehicles and years.  You >>need to have the Eprom
configured for your particular application,  ie. engine size,
>>>compression, camshaft, vehicle weight, etc 

Personally, on an SD1 I'd junk the lot and fit a good ol' 4 barrel
Edelbrock, although I've got the Hotwire system on my Disco and it has
run very reliably for the past 10 years and I use it everyday. The only
part I've had to replace on the efi has been the throttle pot sensor. 

Mark Adams in the UK is the acknowledged expert in chipping the 14CUX.
Other firms like RPI can also provide their own specific chips for these
ECUs but you really need to beware of generic, one size fits all
applications.  Another alternaive, apart from replacing the whole system
with an expensive aftermarket type (Haltec, Motec, Wolf, etc)is to fit
the South African Dastec developed Unichip programmable module in series
with the existing ECU. This simply plugs into the standard loom next to
the 14CUX box, piggy back style, and allows the fuelling inputs to be
adjusted on a dyno to the precise requirements of your engine. 

See http://www.armadale4wd.com.au/products/unichip.htm


Rob



-----Original Message-----
From: rovernet-bounces at lyris.ccdata.com
[mailto:rovernet-bounces at lyris.ccdata.com] On Behalf Of Kent Kinard
Sent: Thursday, 26 October 2006 6:07 AM
To: rovernet at lyris.ccdata.com
Subject: Re: [ROVERNET - UK] 4.6 SD1

On Wed, 25 Oct 2006 17:59:56 +0000
  "steve bridge" <slbridge at hotmail.com> wrote:
> Hi Kent,
>  What do you mean: ''Vitesse Spec"?   Is the 4CU the 
>hotwire or the 3.5 EFI
> (SD1) system?

Hi Steve,
I have your airflow meter but I need a shipping address.

Lucas 4CU systems are all "flapper" air meter systems and were used on
Federal and Australian SD1's like yours and mine.  They were also used
on Vitesse, VDP EFI SD1's and UK Range Rovers but with the later style
plenum and velocity stacks and without Lambda sensors.  The Vitesse and
Range Rover 4CU computers will plug into your Federal system and
eliminate the Lambda sensors (and catalytic converters where state law
allows) ;-)  The Range Rover and Vitesse ECU's differ from each other
and the Vitesse is a better match for the SD1 vehicle.

A rising rate fuel pressure regulator ( to counteract high speed lean
out) and perhaps higher flow injectors would be useful.  The Federal
type flat plenum is really not that bad, particularly with a 3.5 and
stock heads.  The ECU and piston area are the limiting factors for
Federal SD1's. 
 Franc has been doing Vitesse conversions on the Federal ECU for quite a
few years.  Google "Stunned Buffalo".

13CU and 14CU systems were only used on North American Range Rovers for
a few years.  This is a "hot wire" system but the ECU is not tuneable.
It is easy to upgrage this system with a 14CUX ECU and a minor wiring
change.  The 14CUX is the definitive "hot wire" system.  Some came with
plug in chips and others must have the plug installed. 
Most Range Rovers from '89 to '95 and early Discos.  The 14CUX can be
configured to run with or without Lambda Sensors.  Various Eproms were
used in different vehicles and years.  You need to have the Eprom
configured for your particular application,  ie. engine size,
compression, camshaft, vehicle weight, etc.

Roverly,
Kent K.

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