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Static vs. dynamic.... more Posted by Karl [Email] (#161) [Profile/Gallery] (more from Karl) on Mon, 22 Jan 2001 12:05:09 In Reply to: Those figures ..., Caspar, Mon, 22 Jan 2001 11:14:35 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Hi Caspar,
That's because Saab and BSR (and most other tuners for that matter) use different measurement norms.
Saab use a so called static measurement, which essentially means that a 9-5 Aero can and will hold 230 hp for a more or less indefinite time. That's also why Saabs figures do not take the overboost function into account as 230 is what the car delivers for an extended period (more than 20 secs) at 5500 rpm or whereever stock max output is.
Most tuners use a so called dynamic measurement where output is measured during one WOT burst up through the RPM's. You may thus get a higher reading due to boost peaks and you also do not take into account EGT build-up and subsequent increase in back-pressure.
Many tuners do argue that dynamic measurement more accurately portrays real life performance and driving situations, such as overtaking. Most of us do not spend our days doing WOT runs on unlimited stretches of German autobahn... I have been recommended by "an aquaintance" at the Saab engine plant in Trollhättan to not exceed 20 secs of WOT with my reprogrammed software as this MAY result in engine damage due to rapid EGT increase.
Thus static measurement is the main reason why the 9-5 Aero is at least as fast as a Volvo S60 T5 despite a disadvantage of 20 hp on "the fact sheet"...
/ Karl
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