3.9 V8 performance upgrade suggestions - Page 2 - Defender Source
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  #21  
Old December 2nd, 2015, 01:56 PM
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John B.
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There are plug and play MS systems and plug and play programmable 14CUX systems available for the Rover V8.

The 14CUX has also been decoded and the instructions for mapping it yourself are freely available online. All available through a simply Google search....
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  #22  
Old December 2nd, 2015, 02:04 PM
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Megasquirt for V8 engines - Index

Lloyd Specialist Developments | Engine Management Kits
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  #23  
Old December 2nd, 2015, 02:06 PM
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Re-map Lucas 14CUX for Rover V8
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  #24  
Old December 2nd, 2015, 02:14 PM
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David Katz
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I just had an ACR 4.8 Hi-Torque installed in my 110. It makes lots if low end torque. I am running a Edelbrock carburetor. ACR says it would make more power at higher rpm with EFI. The bottom end is good to 6,000 RPM per ACR.
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  #25  
Old December 2nd, 2015, 02:23 PM
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http://store.toddcosuspensions.com/landrover50ho.html
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  #26  
Old December 2nd, 2015, 02:27 PM
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A cam and timing set do help as most of these trucks are over 100k.

Most folks dont "build" late model fuel injected engines without tuning the ECU. All manner of modifications can go into an engine but if you address the ignition and fueling aren't whats the point. I installed a Crower cam ported the heads and intake, it helped a little but the truck is still a pig. Granted the shortcomings of my trucks performance could probably be attributed to my lack of mechanical abilities. These engines never made much over 200bhp, combine that with the Rover driveline how much of that power is lost on its way to the wheels?

Ive driven a Callaway P38, supposedly this the tuning to match the engine.

You want performance install 3.90 or 4.10 gears.
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  #27  
Old December 2nd, 2015, 02:29 PM
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WOW the 5.0 in a 110 must be a nice set up!
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  #28  
Old December 2nd, 2015, 02:29 PM
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Quote:
Originally Posted by Red90 View Post
Ive read that guys page, who wants to experiment?
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  #29  
Old December 2nd, 2015, 02:52 PM
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shayne young
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I've got a complete Holley fuel injection kit for sale..intake manifold and all... Lots of tuneability..I've also got a crower performance can laying around for it too..
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  #30  
Old December 2nd, 2015, 03:26 PM
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By a clear mile you already have the best iteration of the Rover V8. That said this engine is beyond primitive. Want more power, better reliability, longevity, repairable by the mechanic at the local gas station, better gas milage & parts readily available everywhere install a carburated Chevy 350. Want better install an LS.

There are only 2 versions of the Rover 4.6 V8. Thoes that have dropped a liner & thoes that will!!
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  #31  
Old December 2nd, 2015, 03:27 PM
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Brett Fritzler
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I've got one of the 4.6 non-cat chips for my 3.9 14CUX ECU for when I finally get to that point in my build. I've also got a spare 3.9 and 4.2 14CUX ECU laying around I may experiment on.
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  #32  
Old December 2nd, 2015, 11:02 PM
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Quote:
Originally Posted by Grover View Post
How many miles on you 3.9L? A good tune up helps...
About 126K miles. I'm not going to switch out engines. To partial to keeping the NAS all original outside some small cosmetic upgrades and will keep original parts just in case I ever decide to sell someone wants to convert back.

I was really hoping to see if there were small things to gain 5hp here and 10hp there type improvements. A good tune up is probably in store at this point. Engine does run solid.

------ Follow up post added December 2nd, 2015 11:03 PM ------

Quote:
Originally Posted by rover4x4 View Post
Its a waste of money to do anything unless you can tune the EFI to match the upgrades. Keep it tuned up and carry on.
Not a bad suggestion.
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  #33  
Old December 2nd, 2015, 11:14 PM
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You could change your gearing to give a little more quickness off the blocks. 4:11's are a decent upgrade.
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  #34  
Old December 3rd, 2015, 12:08 AM
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I had my 3.9 redone to a 4.6.. kept everything same but reworked internal engine, including new sleeves, etc. full boat. no effect on ECU. My understanding is working with 14CUX is asinine because only few people really know how to unlock it and then the fuel mapping system is stupid to work with.

This is a 3.9 to 4.6 conversion you want. Takes 3.9 block, adds in some 4.6 parts in the cam and 010 bearings, etc. and you get 40 gain ish about. You can carb it up too...

call guys at Blackstone Rover. They do defender restorations, etc and these engines etc. They did mine about year or year half ago.

I considered other options, but LS seems to have injection mapping issues, the bigger compressions i thought were risk, and and didnt want to mess around with entire new system around the engine that no body could work on.

I think for a lower cost version you could put a carb system on it and get increase from that alone. I entertained something similar before going full boat....

Also, you could consider sticking in a performance cam...

few ways to skin the cat on this. hope you get it one day good.
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  #35  
Old December 3rd, 2015, 12:55 AM
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Scott Striglos
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In another life I spent 12k on one of those RPI 4.6 325hp engines in a RRC and yes it had additional power but never got me where I wanted to be on hills and passing. The engine build was of the lowest quality, rebuilt it 2x and junked it after 46k miles. I currently have a ACR 4.6 going in a NAS 90 and won't have it done for another couple weeks so I can't speak to the performance but have been very happy with the ACR I but in a Series IIa and have heard very good reviews of the build quality. We are still working out the kinks in my LS install in another RRC, but seems very promising. But back to your original question....others here have answered it well.....there is nothing of any significance that can be bolted on to the 3.9. I run GBR's 4.14 diffs with 32-33" tires and feel that is of real value.
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  #36  
Old December 3rd, 2015, 01:04 AM
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Quote:
Originally Posted by SGS714 View Post
In another life I spent 12k on one of those RPI 4.6 325hp engines in a RRC and yes it had additional power but never got me where I wanted to be on hills and passing. The engine build was of the lowest quality, rebuilt it 2x and junked it after 46k miles.
Really? Dang. I would have thought the quality to be better.

Quote:
Originally Posted by SGS714 View Post
I currently have a ACR 4.6 going in a NAS 90 and won't have it done for another couple weeks so I can't speak to the performance but have been very happy with the ACR I but in a Series IIa and have heard very good reviews of the build quality.
Good to know about ACR. They were new to my map of uk tuners and I'm kicking myself for not buying an ACR 4.8 hi-torque (and the disco II it was in for $6k) but it was Bosch and I didn't want to deal with the SAI, shipping from Chicago, and the "strange" factor of the deal.
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  #37  
Old December 3rd, 2015, 04:05 AM
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I would think port/polish and gasket matching the upper intake manifold, heads and exhaust manifolds would help and not cause reliability issues.
At 126k, your cam could be worn thus affecting flow.
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  #38  
Old December 3rd, 2015, 07:00 AM
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Quote:
Originally Posted by Grover View Post
I would think port/polish and gasket matching the upper intake manifold, heads and exhaust manifolds would help and not cause reliability issues.
At 126k, your cam could be worn thus affecting flow.
Marginal gains at best, maybe a little better throttle response and a little more low end.

I think anyone would be giggly even with a Vortec 4.8 in a RRC compared to a 3.9 or hot 4.X.
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  #39  
Old December 3rd, 2015, 11:20 AM
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Anyone run across a HP/torque curve comparing the stock 3.9 vs 4.6?
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  #40  
Old December 24th, 2015, 09:57 AM
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@ Scott, I'm getting ready to order a 4.8 Sports from Roland at ACR as well for an NAS D90 ST. Did you keep your stock engine management with a Tornado chip/remap? I'm considering going full Omex 710 system, but it's pretty pricey. I'm not sure if it's worth the extra cost?
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