drivetrain losses article interesting read
29-04-2011, 04:27 PM
#1
10K+ Poster!!
Thread Starter
iTrader: (4)
drivetrain losses article interesting read
http://www.rri.se/function/functiond...pe=whitepapers
just download this white paper pdf, it wont let me link my downloaded file ?
just download this white paper pdf, it wont let me link my downloaded file ?
29-04-2011, 05:13 PM
#4
And it also states how pointless the "coastdown" method some RR's use to guesstimate transmission losses.
Pointless because there is no load applied through any of the drivetrain.
Pointless because there is no load applied through any of the drivetrain.
29-04-2011, 05:19 PM
#5
10K+ Poster!!
Thread Starter
iTrader: (4)
yes as i said it is a proper interesting report on it. rototest dont do flywheel figures just hub. average loss in there tests of 9% hp 7% lbft are a much more realistic reduction imo
Trending Topics
30-04-2011, 11:10 AM
#9
10K+ Poster!!
Thread Starter
iTrader: (4)
id guess that was to try and cover up the fact that cars made less than quoted power, was it about the xr4x4 ? im sure ive read they never made the quoted power.
30-04-2011, 11:39 AM
#10
it was an article about the dohc 4x4 sierra, i'll dig it out again if i can find it 
there was another one where exciting figures were a bit dismal compared to today, i think it was the same car that was supposed to have a chassis that was only capable of handling 150 brake
there was another one where exciting figures were a bit dismal compared to today, i think it was the same car that was supposed to have a chassis that was only capable of handling 150 brake
30-04-2011, 12:27 PM
#11
Anyone interested in such things may also be interested in an article I wrote some time ago about Dyno's.
Link here.
Link here.
30-04-2011, 12:34 PM
#12
10K+ Poster!!
Thread Starter
iTrader: (4)
something else i have read is that the losses are not linear. they get higher as speed increases upto a maximum of 17% but at slow speeds can be as low as 5%.
i see coastdown is utter bolloxs because of the simple fact that its being measured with no turning force applied to it.
i see coastdown is utter bolloxs because of the simple fact that its being measured with no turning force applied to it.
30-04-2011, 01:00 PM
#13
Originally Posted by stu's article
CAN TRUE TRANSMISSION LOSS EVER BE MEASURED?
Yes, and it’s actually very easy. Whip the engine out and measure its power on an accurate engine dyno, install it back in the car and run it again on your chosen accurate chassis dyno. Use the power at the wheels figure only and subtract one from the other. Hey presto, pretty accurate transmission losses.
Yes, and it’s actually very easy. Whip the engine out and measure its power on an accurate engine dyno, install it back in the car and run it again on your chosen accurate chassis dyno. Use the power at the wheels figure only and subtract one from the other. Hey presto, pretty accurate transmission losses.
02-05-2011, 08:56 AM
#14
10K+ Poster!!
Thread Starter
iTrader: (4)
this seems to be the most comman system used
http://wzeu.search-results.com/r?t=p...dynocalc.shtml
my thoughts are probably yes it is accurate as working out peak power but over inflates the earlier curve of power figures.
http://wzeu.search-results.com/r?t=p...dynocalc.shtml
my thoughts are probably yes it is accurate as working out peak power but over inflates the earlier curve of power figures.
Thread
Thread Starter
Forum
Replies
Last Post
nicodinho
Ford Non RS / XR / ST parts for sale.
6
07-10-2015 12:56 PM