Vehicle & Technical > Range Rover

3.5 to 3.9 INLET SWAP

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UK CRAIG:
Hello guys,

I've got a 3.5 EFI RRC, I've just bought some tubular exhaust manifolds for it, what I am now wondering is if I change the inlet manifold/plenum chamber/airflow metre to a 3.9 will this increase the airflow into the engine or not, and therefore an increase in power?

If so is the airflow metre wiring compatible or will I have to change the whole loom and ECU etc?

Any help will be greatfully accepted.

300TDi Disco:
I have got the tubular manifolds on mine. I was thinking the same idea of changing the cam to the 3.9. I was also thinking of changing the exhaust from the manifolds to side exit's.

hairyasswelder:
Need to change airflow, ecu, injection/ecu loom for non cat 3.9 items unless fitting lamda sensors :-k :-k

How about the cam  :D :D I been told that good for a few horses  :twisted: :twisted:

been toying with the idea  :dance: :dance:

bogie:
From what i recall,put a 3.5 injection system on a 3.9 and you will blow it up,as with a 3.9 on a 3.5 a dought it will do it any good,incorrect fueling?

hairyasswelder:

--- Quote from: bogie on November 03, 2009, 18:44:37 ---From what i recall,put a 3.5 injection system on a 3.9 and you will blow it up,as with a 3.9 on a 3.5 a dought it will do it any good,incorrect fueling?

--- End quote ---

????? never heard of that,,, the flapper has a manual mixture screw...

I know people that run 3.5's with 3.9 systems on, 4.6 with carbs and a 3.9 with SU carbs straight off a 3.5 and thrash the ..........ks off them  :? :?

I think it is the best combo, 3.5 has the best block and the 3.9 has the best efi system and the cam has a higher lift,

If in doubt on the fuelling use the later system with lamda sensors and it will correct itself through the emissions??

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