F.A.Q.    Register    Login    Home Members    Search

Toymods » General Car Talk » Power to wieght ratios , how relevant are they? Show: Today's Posts  :: Show Polls  Email to friend

Author	Topic
ke382TG Forums Junkie Registered: May 2002	Re: Power to wieght ratios , how relevant are they? Thu, 21 October 2004 01:08 Like has been said above, power to weight is just one of many factors to consider when looking at the performance of a vehicle. A rough calculation on my own vehicle yields the following results: Car weight (full tank of fuel) ~900kg (weigh bridge ticket) Power (at the wheels) 170kw so we might assume approximately 200kw at the flywheel. 900kg/200kw = 4.5kg/kw (any values of 10kg/kw tend to indicate the car will go ok) Now this little figure of 4.5kg/kw relates a little bit to the following characteristics that are present with my car: *It's nice and quick off the line as it makes reasonable power and doesn't have much mass to move *A good launch can be hard on some surfaces as traction (even with decent street rubber) can be difficult due to the low weight, especially over the rear end *Acceleration from corners etc is great as it is not accelerating a great mass (not a great mass for a car anyway) *at the drags when I race a larger capacity car that runs similar times if we both get off the line at about the same time mine will scream ahead till about half track then the other car will start making ground and we will cross the line almost together (got this on video a number of times). Some performance figures are: 12.8 on street tyres over the quarter at WSID (2.2 second 60 foot for this particular run due to lots of wheel spin, so with a bit less of a retarded/lead footed start the times will drop a little ) it has previously run many 1.7 second 60 foot times (with less power so take offs were a tad easier). It has been G-teched in the high 12's and doing 0-100 km/h in 4.3 seconds (2 people in the car, flat as a tack road. As a note a couple of GTR's and WRX's were G-teched as well as many other cars (mostly imports) and the nearest were nearly a full second slower 0 - 100 and the GTR's were closest over the 1/4 but were still 0.5 seconds slower ) **The G-tech times are indicative only but were a great comparison between almost 50 cars that ran (mine taking the quickest 0-100 and 1/4 miles times ). Also my car has very solid stiff suspension set up for cornering rather than drags so it does not squat off the line and therefore does not "trick" the G-tech into thinking it is seeing greater g-forces than the acceleration is actually producing (a common occurrence in many g-tech runs for softer suspension vehicles). I think the best thing is to think about a car as a package and what it is to be used for. I wanted an "all-rounder" that will provide fun in many different events and situations and I think I have got pretty close to that now. Cheers. [Report message to a moderator]

	Subject	Poster	Date
	Power to wieght ratios , how relevant are they?	tyottsoarer	Wed, 20 October 2004 10:47
	Re: Power to wieght ratios , how relevant are they?	draven	Wed, 20 October 2004 10:59
	Re: Power to wieght ratios , how relevant are they?	river	Thu, 21 October 2004 00:21
	Re: Power to wieght ratios , how relevant are they?	cozzb	Thu, 21 October 2004 00:53
	Re: Power to wieght ratios , how relevant are they?	justcallmefrank	Thu, 21 October 2004 00:25
	Re: Power to wieght ratios , how relevant are they?	BlackSupra	Thu, 21 October 2004 00:29
	Re: Power to wieght ratios , how relevant are they?	Evil_Foetus	Thu, 21 October 2004 02:54
	Re: Power to wieght ratios , how relevant are they?	Shraka	Thu, 21 October 2004 03:33
	Re: Power to wieght ratios , how relevant are they?	ke382TG	Thu, 21 October 2004 01:08
	Re: Power to wieght ratios , how relevant are they?	cozzb	Fri, 22 October 2004 22:47
	Re: Power to wieght ratios , how relevant are they?	Skip	Thu, 21 October 2004 02:14
	Re: Power to wieght ratios , how relevant are they?	ke382TG	Thu, 21 October 2004 02:45
	Re: Power to wieght ratios , how relevant are they?	Shraka	Thu, 21 October 2004 02:51
	Re: Power to wieght ratios , how relevant are they?	Corona RT142	Thu, 21 October 2004 07:45
	Re: Power to wieght ratios , how relevant are they?	justcallmefrank	Thu, 21 October 2004 07:47
	Re: Power to wieght ratios , how relevant are they?	Corona RT142	Thu, 21 October 2004 07:49
	Re: Power to wieght ratios , how relevant are they?	justcallmefrank	Thu, 21 October 2004 07:56
	Re: Power to wieght ratios , how relevant are they?	Corona RT142	Sat, 23 October 2004 00:09
	Re: Power to wieght ratios , how relevant are they?	Chris Davey	Sat, 23 October 2004 05:38

Previous Topic:	Do turbos take it up the turbo pipe?
Next Topic:	Dont know about you....

Powered by: FUDforum 2.3.8
Copyright ©2001-2003 Advanced Internet Designs Inc.