Quote:
Originally Posted by m5james
I think there is always a little wiggle room left just to be on the safe side, so I don't think it's a scam. I'm not sure what years you consider to be modern, but my 91 M5 came with 315hp stock, yet the chip I have bumped it up to 340. That sounds like a lot for such a simple chip, but it was literally a night and day difference on the M. My bike has software as well, and it's a huge difference. As for the X, the gains are only 10hp or so, which isn't huge, but probably noticeable nonetheless. IMHO, about the only scam here really is $$Dinan$$ and their pricing on parts, but as I mentioned, I don't doubt that there is always a little wiggle room left in software tuning from any stock ECU, BMW or otherwise.
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It seems like there was more HP left on the table in the 1980's and early 1990's. Mid 1990's and on the gains started shrinking (with the exception of the new turbos). I think Conforti squeezes about 20 HP out of the new M3 with dyno sheets to prove it.
The dyno sheet on Turner Motorsports website shows a 2 lb. ft of torque and 3.5 HP increase for the X5 3.0 engine. Add the Conforti cold air intake and it bumps it to 7 lb. ft and 7 HP. Also, keep in mind that most of this HP is available in the second half of the RPM range.