Drive train losses thread...

[S3000]

Just found this on a other board, i think this is interesting for many Petrolheads.
Maybe you guys have other datas from a different source ?

BMW 335i (6%)
http://www.rri.se/popup/performancegraphs.php?Char...

Audi RS4 (17%) horrible
http://www.rri.se/popup/performancegraphs.php?Char...

E46 M3 (12%) eehh
http://www.rri.se/popup/performancegraphs.php?Char...

E60 M5 (7%)
http://www.rri.se/popup/performancegraphs.php?Char...

C6 Z06 (7%)
http://www.rri.se/popup/performancegraphs.php?Char...

Edited by S3000 on Sunday 9th October 21:47

[Mr Sparkle]

I thought most cars were around 14/15% wouldn't have thought they could be as low as 6%. I wonder how motorbike drive trains compare to cars ie. chain vs shafts etc.

[mmm-five]

Surely if the first is a calculated flywheel HP (from measuring the RWHP at the hub) and the 2nd is the manufacturer's claimed flywheel HP, then you've got two figures that are both 'estimates'.

The only way to guarantee you're getting the correct figures is to take the engine out and strap it to an engine dyno, and then do a RWHP one from a chassis dyno strapped to the wheel hub (i.e. not on rollers). The difference is then the drivetrain loss.

[NHK244V]

mmm-five said:

Surely if the first is a calculated flywheel HP (from measuring the RWHP at the hub) and the 2nd is the manufacturer's claimed flywheel HP, then you've got two figures that are both 'estimates'.

The only way to guarantee you're getting the correct figures is to take the engine out and strap it to an engine dyno, and then do a RWHP one from a chassis dyno strapped to the wheel hub (i.e. not on rollers). The difference is then the drivetrain loss.

basicly yep, coast down losses are easyly lowerd just by pumping u the tyres