Vehicle & Technical > Range Rover
3.5 to 3.9 INLET SWAP
Range Rover Blues:
The 3.9 cam will probably give you a smooth idle with plenty of grunt and decent power. The ECU might need chipping though.
A performance cam will be designed to develop more power by allowiing the engine to rev, frequently that may come at the cost of low down grunbt, so choose the performance cam wisely. You will need an ECU remap.
Also, the 3.9 cam will cost you significantly less than a "hot" cam.
dod51e:
--- Quote from: Range Rover Blues on November 04, 2009, 00:17:47 ---
So the exhaust is an easy upgrade, the rest of it I'd leave alone unless you want to run the hot-wire EFi rather than the flapper. Hot wire will run in open loop (non-tuning) mode without lambdas and closed loop (self-tuning) with lambdas. You change a resistor in the wiring loom to tell the ECU what to do.
--- End quote ---
Sorry, thread hi-jacked here a bit. The resistor you talk about. Where would it be hiding and what does it look like exactly. I ask as I have a 3.9 with Cats and Lambda Engine in a non cat/Lambda loom!!!!! Engine swap you see. Should it be running a 14CUX ECU or the older 14CU ECU. The car/loom is a 92 and the engine a late 93.
Cheers
Range Rover Blues:
The 14 CU was earlier than that, it's also much bigger and not watertight, so easy to identify.
The tune select resistor is in the loom under the seat andf close to the ECU, it may be taped back. It is sealed into a clear plastic sleeve.
The lambdas will give you the self-tuning but you don't need to keep the cats. The timing is slightly retarded for a cat car too, though I think it may be to ciope with regular unleaded rather than 4-star, not sure.
Your best bet would be to swap the TSR, it unplugs, but also to get rid of the lambdas if you don't need them. The engine is internally the same thing.
You will also find the ECU was re-released virtually every year with very minor tweaks, but any 14CUX will run with or without lambdas/TSR. Some wiring looms however did not have the lambdas connections fitted as a cost-saving.
The ealry analogue 14CU wiring loom also uses a different colour code, though it uses the same pinout. The 2 are interchangeable.
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