Thread: D1 Impco system onto RR classic

Originally Posted by jskerm

Hi all, as the title suggests I am wondering wether it is possible to put a D1 Impco system onto a Range Rover Classic? I have a 94 D1 (3.9 hotwire) on gas in the back yard which I am wrecking. The RR is a 89 3.5 flapper engine which has never had gas fitted and has about 280000 k's on the clock.
The gas system (disco) has the inbetween chassis rail tanks and a LRA saddle tank fitted. Will these fit on the rangey? And will the convertor etc be suitable for the flapper AFM? Thanks in advance.

The converter and mixer can be made to fit. You need an anti-backfire flap on the flapper though. Why not fit the hotwire EFI system while you're at it? The gas tank cradle will not fit exactly the same, the mounting points on the metal fuel tank are different. The LRA corner tank will have the high filler and may be possible to modify to use in the RRC by welding in another filler.

Thanks bee-utey. What is involved with changing over to the hot-wire system? Would I be better off to change the engines over? I kind of want to keep the 3.5 in there though. Less capacity, less fuel right? What are the main benefits of the hotwire system? Thanks again.

Originally Posted by jskerm

Thanks bee-utey. What is involved with changing over to the hot-wire system? Would I be better off to change the engines over? I kind of want to keep the 3.5 in there though. Less capacity, less fuel right? What are the main benefits of the hotwire system? Thanks again.

The 3.5 generally lasts longer in situations where it gets hot, as the 3.9 is more prone to slipped liners. Some versions of the 3.5 (in the early D1) ran the hotwire system anyway. The hotwire system is more reliable, the MAF doesn't strangle the air intake, the ECU can be used with oxygen sensors if needed for more economy. There are many more hotwire systems in Australia for spare parts and the injectors used are easily swappable from common Bosch equipped vehicles all over the world. The best way to install the hotwire system is to install the complete lower intake manifold, maf, ECU and harness off the D1. You then install the manifold top of your choice (plain or 3.9). Others on this forum may advise if there are any differences between the 3.5 and 3.9 hotwire systems.