Vehicle & Technical > Range Rover
3.5 > 3.9
hairyasswelder:
--- Quote from: "jjsaul" ---cheers steve
see my thread 'ooops i killed it' and you will see why i need an engine!
--- End quote ---
Saw the thread :shock: bit of a mess 8) and the offer of the low milage engine :D sounds a good deal
Steve
Range Rover Blues:
The big gains (I'm not sure about the 8%, that's about 5 BHP) comes not from the capacity as much as from the camshaft and exhaust.
The 3.9 is simply a bigger bore, with the same EFi headers, but as you will have noticed it is routed differently around the gearbox crossmember (which is different).
I have gone back to a 3.5 sports pipe (same bore as the factory 3.9 pipe) and 3.5 crossmember to protect it a little more anyway. The chassis hangers are differetn on the 2 exhausts :roll:
The big difference in UK market is the hot wire EFi as opposed to the flapper.
Hot wire would work on the 3.5 just as well, if not better. The late 3.5 were hot wirem but it's an early version and I've only ever seen 1.
Oh, oil cooler as standard on the 3.9, so new radiator, and the Borg-Warner T-Box has a slightly different ratio.
hairyasswelder:
--- Quote from: "Range Rover Blues" ---(I'm not sure about the 8%, that's about 5 BHP)
--- End quote ---
5bhp???? that would make it around 65 bhp total :oops:
3.5 V8 (88.9x71.1)165 bhp @ 4000rpm
3.9 V8 (94.0x74.1)181 bhp @ 4750rpm
Maybe 10% then :roll: but the gain would be less if not using the hotwire system,
If using the hotwire system the wiring and ECU (14CUX) need to be changed, not an afternoon job :(
The early Disco's used 3.5 with hotwire but dont know output on this set up (still need 14CUX ECU)
The issue I would have is the wiring, must be 30+ wires.
You would need to buy a complete RR 3.9 very cheap (good engines fetch GOOD money) and transfer a hell of a lot of stuff.
Take the low milage motor, drop it in and go.
my opinion is to Forget the 3.9, too much money, trouble and too little gain.
For the money, use a 3.5, upgrade the cam and heads if you really need the extra horses then you
Just dont put a diesel engine in it :lol: :lol: :lol: :lol:
Steve
jjsaul:
--- Quote from: "hairyasswelder" ---
For the money, use a 3.5, upgrade the cam and heads if you really need the extra horses then you
Just dont put a diesel engine in it :lol: :lol: :lol: :lol:
Steve
--- End quote ---
will probably do that in the future...just gonna fit a carbed 3.5 for the time being as a cheap fix.
as for diesels :? eurgh no thanks :twisted:
Range Rover Blues:
Even with the carbs it's worth fitting an EFi engine, or at least the heads/exhaust. The EFi only really adds reliability.
The hot -wire system is easy to fit if you get the wiring loom with it, without it I wouldn't bother.
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