The 75 and ZT Owners Club Forums - View Single Post

Reebmit · 5th February 2009, 14:00

best way is chat to your local rolling road and see if they will just run it on the rollers quickly and see what it is actually putting out at the wheels, this will give and indication, remember though that the figures you are all talking about is flywheel horsepower. Most rolling roads would only charge a few quid or beer money for this, if not maybe 1/2 labour.
Take the wheel figure and divide by 0.85 for FWD or 0.83 for RWD and that will get you as close to the true engine flywheel bhp as you are ever going to know, its never clear cut as there are many factors to consider but it gives a very close ball park flywheel figure. Another rule of thumb which is quite accurate is to treat the losses as being 10% of the flywheel power plus 10 bhp for FWD and 12% plus 10 bhp for RWD cars, hope this helps

5th February 2009, 14:00	#7
Reebmit Gets stuck in Rover 75 Con SE CDTi, 205 GTi 1.9 (x 2), 205 CTi 1.9, 205 GTi Mi16, Ford C-Max 2.0 TDCi Ghia, MR2 GT Join Date: Nov 2008 Location: Alderholt, Nr Fordingbridge Posts: 935 Thanks: 11 Thanked 15 Times in 9 Posts	best way is chat to your local rolling road and see if they will just run it on the rollers quickly and see what it is actually putting out at the wheels, this will give and indication, remember though that the figures you are all talking about is flywheel horsepower. Most rolling roads would only charge a few quid or beer money for this, if not maybe 1/2 labour. Take the wheel figure and divide by 0.85 for FWD or 0.83 for RWD and that will get you as close to the true engine flywheel bhp as you are ever going to know, its never clear cut as there are many factors to consider but it gives a very close ball park flywheel figure. Another rule of thumb which is quite accurate is to treat the losses as being 10% of the flywheel power plus 10 bhp for FWD and 12% plus 10 bhp for RWD cars, hope this helps Last edited by Reebmit; 5th February 2009 at 14:30..