OK so a 30kg parcel arrived containing the complete fuel injection system (loom, manifolds, sensors, plenums, injectors, ECU) from a 1997 3.9 Discovery based around the ubiquitous 14CUX. Seems unbelievable this lot was barely £150 (if it works - the ECU I know does for certain).
Anyway my plan is to go this route very nicely detailed here: http://www.britishv8.org/articles/rover ... re-efi.htm and run it is closed-loop mode for efficiency and the fact it effectively auto-tunes.
I have some question that hopefully I can answer before without gaining it through bitter experience.
1. Does the plenum fit under an S1 bonnet without any height reduction? It looks like 0.8" can be had without much pain. What is the penalty for shortening the effective length of the inlets? (if any - have a feeling it might lower torque ).
2. The fuel pressure isn't very high in this system so the Jaguar electric pump is a fairly painless solution. However we have our reserve tanks which are switched with a valve. Is the very simplest solution of simply bringing both tanks together (doing away with the reserve but keeping the overall capacity) and the pick-up and return lines at a single point directly under the tank workable or do we really need a dedicated return into the tank?
3. What is the thread size for the lambdas? I understand they should be as close to the manifold in the downpipes as possible but how deeply should the be positioned into the exhaust stream?
4. Recommendations for airbox/filter (standard LR can?). Want quiet. I don't like the breathy sound from K&N and the likes.
5. I'm doing this mainly for efficiency and my own curiosity as I?m an electrical engineer and this might be a stage towards megasquirt/megajolt as the basic hardware is fairly sound for that application also. What sort of output/torque on a 3.5 engine with 10:5:1 engine should I expect? Would the compression and the superior EFi system crack the 200bhp barrier given the Vitesse was 190 or 205 with the twin plenum? Would a 3-5mpg improvement be realistic? I read that the later injectors were good for an extra 1-2mpg themselves...
Anyone else done this? If so any tips/pitfalls?
Anyway my plan is to go this route very nicely detailed here: http://www.britishv8.org/articles/rover ... re-efi.htm and run it is closed-loop mode for efficiency and the fact it effectively auto-tunes.
I have some question that hopefully I can answer before without gaining it through bitter experience.
1. Does the plenum fit under an S1 bonnet without any height reduction? It looks like 0.8" can be had without much pain. What is the penalty for shortening the effective length of the inlets? (if any - have a feeling it might lower torque ).
2. The fuel pressure isn't very high in this system so the Jaguar electric pump is a fairly painless solution. However we have our reserve tanks which are switched with a valve. Is the very simplest solution of simply bringing both tanks together (doing away with the reserve but keeping the overall capacity) and the pick-up and return lines at a single point directly under the tank workable or do we really need a dedicated return into the tank?
3. What is the thread size for the lambdas? I understand they should be as close to the manifold in the downpipes as possible but how deeply should the be positioned into the exhaust stream?
4. Recommendations for airbox/filter (standard LR can?). Want quiet. I don't like the breathy sound from K&N and the likes.
5. I'm doing this mainly for efficiency and my own curiosity as I?m an electrical engineer and this might be a stage towards megasquirt/megajolt as the basic hardware is fairly sound for that application also. What sort of output/torque on a 3.5 engine with 10:5:1 engine should I expect? Would the compression and the superior EFi system crack the 200bhp barrier given the Vitesse was 190 or 205 with the twin plenum? Would a 3-5mpg improvement be realistic? I read that the later injectors were good for an extra 1-2mpg themselves...
Anyone else done this? If so any tips/pitfalls?