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C4S Surgeon said:
If it sounds too good to be true, it probably is. If it was that easy to gain 30hp, why didn't those silly porsche engineers just do that rather than the x51?
I can answer that one quite easily.
The X51 has to work in a variety of conditions worldwide under a wide variety of extremes. It must also be reliable and work under a considerable variety of fuel qualities. (i.e. someone who lives in dubai and uses dubious quality fuel needs far more tolerance for to resist detonation than do I in England)
Furthermore, each engine is slightly different and some engines will produce more power than others if mapped 'individually'.
The Skyline I had before my 997 was taken from a generic mapping to a specific 'mapped for my engine alone' mapping. That was programmed to run only on high grade fuel (98 Octane), and had no extra tolerance for high temperatures or extremely cold ones. (We don't have them in the UK!).
The end result was fantastic. The difference in purely a change of mapping amazed me. I couldn't believe it would make that much difference.
(What makes it a slightly unfair comparison is that in my case, they actually removed the ECU, threw it in a box, and put a higher spec fully programmable one in its place)
That having been said.. I would not let anyone do this to my new 911. I have also heard more horror stories on this subject than success stories like mine above.
Also 30bhp does sound a little on the optimistic side!
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