Quote:
Originally Posted by Boss330
In the last edition of German magazine Autobild Sportscars they ran a story covering 7 tuners plans for the M4:
All quoted around 500hp
Manhart quoted 500hp and 640Nm
Two companies claimed 510hp and 516hp respectively.
AC Schnitzer also said 500hp.
As swamp2 pointed out, these will all be piggyback tunes. Both because it's "impossible" to crack the ECU these days and just as much because German tuners need to comply with emissions legislation. By using a piggyback they can rely on the stock BMW software for the test cycle criterias (which only consists of fairly low load driving). That way they meet emission standards without problems, and can add power outside the test cycle criterias.
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I also read this article, but what none of these tuners says ... also with the best piggyback V/max would be max 250km/h or 280km/h (with M Drivers Package!) !!!
AND when I read the article/thread about the S55 engine, no tuner could give you an waranty that the M3/M4 would be significant faster with his tune, because allready BMW has done its best to optimise the driveability of an in this terms problematic turbo engine ... I think the S55 has this torque as it has because more torque would make the driveability not betterr.