I *think* an ECU from a 5-speed will work in an automatic, but not vice versa. 1996 and 1997 model years are compatible. However, what is really driving your fuel consumption is those huge injectors - they are about twice the size of stock. If you install a stock ECU - assuming that it is one that is compatible with your car, say to be certain you picked up an ECU from a 1996-1998 CSE or Aero automatic - it will not run right with those injectors. If you want to save fuel, get smaller injectors, and a custom tune to match your injectors to your turbo. (It's also a pretty huge turbo). If you go changing the turbo too, then you maybe may as well have bought a different car... Try JZW or any of the other reputable tuners. If you're in MA, I know somebody who could put something suitable together for you for reasonable money, I'm sure, though I'm guessing you're not since you say 13 L/100 KM (about 18 MPG in US speak). This is not great mileage, especially at current fuel prices, but I doubt you will get significantly better than 22-23 highway with that big turbo. I know that's 20%. The additional ECU, properly tuned, with Green Giant injectors will probably pay for itself in 12,000 miles or so. If you're planning to pick up a different car for a daily driver anyway, it may not be worth the trouble, just enjoy all the power you have and try to not think too much about the gas you're burning.
posted by 38.223.231...
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