Quote:
Originally Posted by lowlevelhell
Rather unlikely that you'd see a whole .5 from a software tune that nets about 75 hp in a two and a half ton vehicle.
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The BMW tune may actually re-tune your motor rather than the piggybacks from RC, etc. Total HP and torque increases mean absolutely nothing unless it is explained where the HP and torque is applied. If both come in early in the RPM, then it might launch nicely. If the HP and torque are at the top of the RPM, you'll probably never use it.
I've read where some say the sound of the exhaust is different. The only way this can happen without changing the exhaust is by altering ignition timing/fueling/valve timing. Possible proof of true re-tuning.
Additionally, it is interesting that BMW states, "not for vehicles with a hitch." That means, no towing. It means, the tune is on the edge of the engine's parameters/capabilities and putting an additional load on the engine could cause damage. To me, that means the manufacturer is claiming the maximum safe additional HP/TQ is 20/32.