I don't know much about the GEMS system, but I imagine that it is only able to compensate for slight increases in fuel and air flow, therefore if a progressively larger increase in horsepower is contemplated, a management system such as Power Chip, Uni Chip, Super Chip etc has to be used. I have heard that the GEMS computer can be reprogrammed to perform similar functions. The type of system you chose, should be selected after you have decided what level of horsepower upgrade you seek, otherwise your putting the cart before the horse IMO. I still have my 95 Discovery supercharged. The 3.9L motor was stroked to 4.7L in 1996 and the supercharger, originally an Eaton bolt on kit that came from Rimmer Engineering, and was fitted in 97. The only problems I found was that it was difficult to intercool it and it produced too much heat, something the engine doesn't enjoy, so I eventually removed it (it's still in a box in my garage), in favour of a Vortech V2. I have been running this system since 1999 and it's extremely reliable, but because of the horsepower the motor produces, I have destroyed two gearboxes.
With regards to the Dweb naysayers, 99.9% have never fitted a supercharger, and the comments they are making, is drawn for hearing about supercharger problems. The majority of these problems were as a result of fitting the Rimmer kit, quite a few ended up on D90's and they suffered I suspect, the consequences of not intercooling, as I have already mentioned. Supercharging is very expensive to set up properly. If you are not prepared to throw lots of money at it, my advice is leave it alone. If your looking for great horsepower increases, especially if your into "Traffic Light Gran Prix" or for overtaking, fit Nitrous. The kits are relatively cheap to purchase and very easy to fit, although the gas can be expensive. I have Nitrous in my 91 Discovery and it takes off faster than the supercharged 95.
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No hand signals, driver playing with his transfer Knob.
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