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AuthorTopic: P38 4.6 into 1990 Discovery  (Read 2339 times)

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Offline Skippy

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P38 4.6 into 1990 Discovery
« on: October 11, 2005, 12:34:17 »
Can anybody shed any light on what i will need to do to the GEMS management system on a 4.6 V8 in order to override all the stuff like the immobiliser, gearbox etc that would normally be connected to it when i install it into my Disco?

The Hotwire injection system on my 3.9 was quite easy as its not really that smart but i suppose the GEMS system will throw a fit if i try and run it without some software/hardware mods!!

Cheers
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1990 Landrover Discovery
Mods: 2" Lift, most of arches chopped out and replaced with Devon 4x4 arch extensions to accomodate 265/75/16 Grizzly Claws, hybrid Evans UK/Rimmer Brothers exhaust, 3.9 efi V8 (Soon to be 4.6 if i can get round to fitting it!!)fitted, Landy LPG system, bull Bar etc, etc........ Now also sporting a Safari snorkle, Discoparts Rock sliders with tree protection, Discoparts Rear Bumper, Warn XD9000 winch, ARB dulux Bull Bar, Evans UK full external & part internal roll cage & chequer plate........Also RPI Tornado chip.

1999 Series 2 V8 GS Disco........ The sensible One coz i aint allowed to modify it AT ALL! Couldnt resist........ it's now running a sweet TD5 Alive exhaust system which sounds great you can hear my car on the exhaust section of the TD5 Alive Web site!

Offline Bush Tucker Man

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P38 4.6 into 1990 Discovery
« Reply #1 on: October 11, 2005, 15:49:44 »
Hasn't Neil ('Thrasher') got a 4.6 in Piglet?, but presumably GEM-free??

Ask him.
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Richard A Thackeray 
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Offline Skippy

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P38 4.6 into 1990 Discovery
« Reply #2 on: October 11, 2005, 16:56:05 »
Cheers, but ideally i would like to keep the GEMS if i can find some kind of override system.  The idea of this is that it gives me more control than my hotwire injection.
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1990 Landrover Discovery
Mods: 2" Lift, most of arches chopped out and replaced with Devon 4x4 arch extensions to accomodate 265/75/16 Grizzly Claws, hybrid Evans UK/Rimmer Brothers exhaust, 3.9 efi V8 (Soon to be 4.6 if i can get round to fitting it!!)fitted, Landy LPG system, bull Bar etc, etc........ Now also sporting a Safari snorkle, Discoparts Rock sliders with tree protection, Discoparts Rear Bumper, Warn XD9000 winch, ARB dulux Bull Bar, Evans UK full external & part internal roll cage & chequer plate........Also RPI Tornado chip.

1999 Series 2 V8 GS Disco........ The sensible One coz i aint allowed to modify it AT ALL! Couldnt resist........ it's now running a sweet TD5 Alive exhaust system which sounds great you can hear my car on the exhaust section of the TD5 Alive Web site!

Offline muddyweb

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P38 4.6 into 1990 Discovery
« Reply #3 on: October 11, 2005, 18:10:23 »
I know someone who put one in a 90 ;-)


Your two main jobs are to decipher the wiring loom so you can work out where to stick power and ground connections....   and you need to defeat the 'Robust Security' on the ECU.   It is designed so that it is usually in constant communication with the body electronics control module (BECM).   The BECM handles the alarm systems and sends signals back to the engine for air con boost, etc.

You can go to someone like Rpi who can supply you with replacement EPROMs for the ECU with this disabled...  the other option is to get down and dirty with an eprom programmer ;-)

The GEMS engine works well in the vehicle though...   just keeps smiling even underwater ;-)
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Offline Skippy

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P38 4.6 into 1990 Discovery
« Reply #4 on: October 11, 2005, 18:19:15 »
Cheers Tim, that what i wanted to hear!!  I was contemplating going for an aftermarket ECU from somone like emerald but i would prefer to keep with the GEMS. I will give them a call in the morning.

What was the 4.6 like in the 90  :D
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1990 Landrover Discovery
Mods: 2" Lift, most of arches chopped out and replaced with Devon 4x4 arch extensions to accomodate 265/75/16 Grizzly Claws, hybrid Evans UK/Rimmer Brothers exhaust, 3.9 efi V8 (Soon to be 4.6 if i can get round to fitting it!!)fitted, Landy LPG system, bull Bar etc, etc........ Now also sporting a Safari snorkle, Discoparts Rock sliders with tree protection, Discoparts Rear Bumper, Warn XD9000 winch, ARB dulux Bull Bar, Evans UK full external & part internal roll cage & chequer plate........Also RPI Tornado chip.

1999 Series 2 V8 GS Disco........ The sensible One coz i aint allowed to modify it AT ALL! Couldnt resist........ it's now running a sweet TD5 Alive exhaust system which sounds great you can hear my car on the exhaust section of the TD5 Alive Web site!

Offline Skippy

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P38 4.6 into 1990 Discovery
« Reply #5 on: October 13, 2005, 10:44:11 »
I spoke to Ian at RPI who supplied me my tornado chip for my 3.9, but he seemed dead against me using the GEMS system at all :shock:
He recons that i should use my existing Hotwire system with a 4.6 upgrade chip, but as you said it would nice to use the GEMS as it is more water resitant and isn't 13 years old.
The other problem with the hotwire is that i would need to install my original distributor which would also mean replacing the cam and various other parts which will probably cost as much as the chip upgrade.

My question is, how did your mate get his to run in the 90?  Any contacts would be appreciated :wink:

Thanks

Chris
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1990 Landrover Discovery
Mods: 2" Lift, most of arches chopped out and replaced with Devon 4x4 arch extensions to accomodate 265/75/16 Grizzly Claws, hybrid Evans UK/Rimmer Brothers exhaust, 3.9 efi V8 (Soon to be 4.6 if i can get round to fitting it!!)fitted, Landy LPG system, bull Bar etc, etc........ Now also sporting a Safari snorkle, Discoparts Rock sliders with tree protection, Discoparts Rear Bumper, Warn XD9000 winch, ARB dulux Bull Bar, Evans UK full external & part internal roll cage & chequer plate........Also RPI Tornado chip.

1999 Series 2 V8 GS Disco........ The sensible One coz i aint allowed to modify it AT ALL! Couldnt resist........ it's now running a sweet TD5 Alive exhaust system which sounds great you can hear my car on the exhaust section of the TD5 Alive Web site!

Offline muddyweb

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P38 4.6 into 1990 Discovery
« Reply #6 on: October 14, 2005, 09:07:28 »
Quote from: "Skippy"
My question is, how did your mate get his to run in the 90?  Any contacts would be appreciated :wink:


I'm a bit swamped at the moment, but when I said I "knew someone", I actually meant that it was me ;-)

http://members.mud-club.com/profiles/muddyweb/vehicle
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Tim Burt
Muddyweb
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www.muddyweb.com
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Offline Skippy

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P38 4.6 into 1990 Discovery
« Reply #7 on: October 14, 2005, 09:18:49 »
Cheers Tim, any advice would be greatly appreciated when you get the chance!!

Thanks
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1990 Landrover Discovery
Mods: 2" Lift, most of arches chopped out and replaced with Devon 4x4 arch extensions to accomodate 265/75/16 Grizzly Claws, hybrid Evans UK/Rimmer Brothers exhaust, 3.9 efi V8 (Soon to be 4.6 if i can get round to fitting it!!)fitted, Landy LPG system, bull Bar etc, etc........ Now also sporting a Safari snorkle, Discoparts Rock sliders with tree protection, Discoparts Rear Bumper, Warn XD9000 winch, ARB dulux Bull Bar, Evans UK full external & part internal roll cage & chequer plate........Also RPI Tornado chip.

1999 Series 2 V8 GS Disco........ The sensible One coz i aint allowed to modify it AT ALL! Couldnt resist........ it's now running a sweet TD5 Alive exhaust system which sounds great you can hear my car on the exhaust section of the TD5 Alive Web site!

Offline Skippy

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P38 4.6 into 1990 Discovery
« Reply #8 on: October 14, 2005, 15:31:51 »
I spoke to Mark Adams this morning, i have never found anybody to be so helpfull and informative :D .
He says that there will be no problems in getting the engine to work complete with the GEMS ecu but without the BECM.

Thanks for your help i will keep you informed!
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1990 Landrover Discovery
Mods: 2" Lift, most of arches chopped out and replaced with Devon 4x4 arch extensions to accomodate 265/75/16 Grizzly Claws, hybrid Evans UK/Rimmer Brothers exhaust, 3.9 efi V8 (Soon to be 4.6 if i can get round to fitting it!!)fitted, Landy LPG system, bull Bar etc, etc........ Now also sporting a Safari snorkle, Discoparts Rock sliders with tree protection, Discoparts Rear Bumper, Warn XD9000 winch, ARB dulux Bull Bar, Evans UK full external & part internal roll cage & chequer plate........Also RPI Tornado chip.

1999 Series 2 V8 GS Disco........ The sensible One coz i aint allowed to modify it AT ALL! Couldnt resist........ it's now running a sweet TD5 Alive exhaust system which sounds great you can hear my car on the exhaust section of the TD5 Alive Web site!
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