Best wel een interessant stukje. Verschil in PK is niet zo groot, koppel van de R56 is wel een stuk hoger. De R53 presteert beter dan op papier en de R56 net andersom
![Lachen :)](./images/smilies/icon_smile.gif)
2007 MCS
![Afbeelding](http://www.rri.se/spec/view/png/graph/STR-06112401-kW-Nm-C.png)
R56
2006 MCS
![Afbeelding](http://www.rri.se/spec/view/png/graph/STR-05052702-kW-Nm-C.png)
R53
In de uitleg zeggen ze dat bij een voorwielaandrijver 1.5% verloren gaat in de versnellingsbak. In het laatste stukje staat eigenlijk dat het verlies eerder 5 tot 7% is. ?! Bij een rollenbank heb je ook nog eens wrijvingsverliezen. Ik denk dat op de rollenbank bij een auto met intercooler ook nog wel wat PK's verloren gaan door de niet optimale koeling.Hans schreef:Ja inderdaadBij Beek wordt het omgerekend.. maar weet wel dat de wielpeekaa's veel minder zijn dan de krukaspeekaa's
Hier zit bijna geen verschil tussen dus ook weinig verlies.. hmm.. raar
RRI schreef:s it possible to measure the power at the engine's flywheel (flywheel power)?
A: There are only two ways to measure the power at the engine's flywheel practically. One, take the engine out of the car and measure it in an engine dynamometer. Two, install a torque transducer between the engine and the gearbox and then use a chassis dynamometer to apply the load. Regardless of what is said in brochures and promotion material there is currently no commercially available method to "measure" the power at the engine's flywheel by means of a chassis dynamometer. However, there are several ways to "estimate" the power. The most widespread belief is that by doing a coast down the transmission losses can be determined and as a result also the engine power. That would be a very simple method if it did not include some serious faults. Most textbooks have a rule of thumb when calculating losses through a transmission, which states that the loss is proportional to 1.5 % of the load times the number of helical gears that interact. For rear wheel-drive with pinion and crownwheel the loss is somewhat higher. According to the textbook a value somewhere around 6 % (4 interacting gears in a FWD) in transmission loss is due to load, but there are other losses other than the load. There are, for example, windage and static, to mention two. Windage is due to the drag caused by oil and air. The static losses are derived from preloaded bearings. What is seen is that by performing a coast down the windage and static losses may theoretically be determined (if an extremely accurate measurement system is available) but the loss, due to the load, is not included. When the load is relatively small the static loss stands for a large proportion of the total loss but during full load measurements this figure has a little influence on the total loss. Empirical data including over 400 vehicles shows that a good estimated value of transmission losses is somewhere between 7 to 10 percent for a manual transmission. The empirical data is based on a comparison between the manufacturer's stated power and torque values and measured values on the wheels. Although the manufacturers stated values could differ by as much as +/- 5 percent according to EC regulations there is a significant grouping around 7 and 10 percent.
Let wel dat dit maar met 1 MINI is getest. Om een beter beeld te krijgen moeten er meerdere MINI's op de bank worden getest.Ferdinand schreef:leuke grafiekjes.
interessant is wel dat de r53 dus meer pk heeft dan r56.
Bovendien worden de waardes van de r53 lager opgegeven dan de werkelijkheid en bij de r56 is dat andersom. Frappant.
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