When I see stock 911 turbos get into overheating issues on the track, think heat is going to be very difficult to manage in a track situation in a tuned car. Yes you may be able to make 500 bhp on lap 1, but by lap 10 you may be making a lot less than that.
Also to the other point, having driven the 1M there is definitely turbo lag. Drove the 1M at the M school and everyone in the class thought the same thing (vs the M3).
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Originally Posted by JoeFromPA
Not sure why you think this is the case. Most turbo cars in existence the past 10 years have had a 10-20% horsepower increase with a tune or tune + exhaust (in some cases, 30% with those).
The reason for this is simple: A mass- manufacturer MUST create their car to meet reliability targets, emissions targets, and other operating targets within the wildest possible set of ranges including wild atmospheric conditions and/or questionable fuel. The manufacturer also needs lots of associated parts to handle the stress well.
A tuner typically pushes the envelope a bit more within a narrower set of conditions: Let's say they test air/fuel ratio and EGT and power output within 30-100 degree temps using a consistent 91 or 93 octane quality fuel, within 2000 feet of sea level, etc. They also aren't worried as much about clutch life, diff life, etc.
And they don't need to, in many cases, honor extended CPO warranties of 100k miles on parts like turbos.
I fully expect the m3 to be tunable by 2016 up to 500 crank HP (+70 or less than 20% HP bump). The reason is simple: BMW, by nature, will not be as aggressive as some tuner is willing to go. And they will also leave some room on the table for performance kits.
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