4.6 or LS in a 14CUX truck

msggunny

Well-known member
Aug 3, 2007
2,964
2
Holly Ridge, NC
Looking at getting another 14CUX truck, either RRC or D1, and putting in a 4.6 or LS into it. After driving my D2 for years I really enjoy the extra "power" of the 4.6 compared to the 3.9 but want an older Rover.

How integral is the ECU of a 14CUX to the vehicle? Can it be run without the OEM ECU? Can I run a different engine with a standalone ECU without it effecting the other ECU's in the truck like the transmission, window, and alarm system ECU's?

If this has been done please feel free to point me in the right direction....

Thanks again!
 

jymmiejamz

Well-known member
Dec 5, 2004
5,828
235
33
Los Angeles, Ca
A 4.6 will run fine with the stock ecu. There is very little you have to change to switch from a 3.9 to a 4.6.

I don’t know what your budget is, the cost of an LS swap is astronomical, especially if you are paying someone else to do it. I’m doing two at the moment and have close to $22k in each in just parts.
 
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JohnnoK

Well-known member
Mar 19, 2017
180
17
Cape Town, South Africa
I don't think the RRC or D1 have much/any system integration between engine and the rest of the systems.
You may find stuff like oil pressure and RPM are picked up by the BCM, but that is easy to work around by using the original sensor/pickup/switches.
 
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Blueboy

Well-known member
Apr 20, 2004
2,653
234
Back in the USA; Rockwood, PA
Have a RPI 4.6 in my ‘94 LWB with 14CUX. Did upgrade the chip though. 275 HP with 302 ft. lbs of torque. Even with a ARB and winch plus roof rack and 235/85 tires big difference than the 4.0 in my stock D1 especially up the hills where I live in W. PA. Personally like keeping it Rover.
 
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Eliot

Well-known member
Feb 4, 2008
678
26
Bozeman, MT

Is money no object? There are some interesting engine options out there.

I would look at their exhaust work. They have some ex F1 guy putting them together.

 

Blueboy

Well-known member
Apr 20, 2004
2,653
234
Back in the USA; Rockwood, PA

Is money no object? There are some interesting engine options out there.

I would look at their exhaust work. They have some ex F1 guy putting them together.

Have heard of them while in Switzerland. Just not totally confident in pushing that much power through a RRC stock drivetrain. More power is always fun yet that isn’t why I have a Classic Rangie.
 
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