RedM Posted September 10, 2007 Share Posted September 10, 2007 It's probably dead simple but I can't find an answer. Link to comment Share on other sites More sharing options...
michael Posted September 10, 2007 Share Posted September 10, 2007 Power (BHP) / Weight (KGs) x 1000 = BHP per tonne So if you had a 300bhp car that weighs 1500kg... 300 / 1500 = 0.2 0.2 x 1000 = 200 200bhp per tonne. (I think, maths used to be something I enjoyed at school but I've lost it a bit). Link to comment Share on other sites More sharing options...
RedM Posted September 10, 2007 Author Share Posted September 10, 2007 Cheers Michael. Now I can amuse myself for hours working out the power to weight ratios of my favourite cars. Brilliant! Another question though. Say you had two cars of the same weight and power. Can one be faster than the other. If so, how? Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 10, 2007 Share Posted September 10, 2007 Weight of car in pounds divided by 2240 , Then divide the power of engine in BHP by this figure. So say the car weighs 2850 pounds, divide that by 2240 to get weight in tons, which is 1.27. Say power is 310 BHP, divide 310 by 1.27 to get a figure of 244 BHP per ton. Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 10, 2007 Share Posted September 10, 2007 Cheers Michael. Now I can amuse myself for hours working out the power to weight ratios of my favourite cars. Brilliant! Another question though. Say you had two cars of the same weight and power. Can one be faster than the other. If so, how? Yes, aerodynamic drag, gearing, rolling friction, drivetrain losses, blah blah. Link to comment Share on other sites More sharing options...
Scooter Posted September 10, 2007 Share Posted September 10, 2007 Another question though. Say you had two cars of the same weight and power. Can one be faster than the other. If so, how? what Chris said! Link to comment Share on other sites More sharing options...
tbourner Posted September 10, 2007 Share Posted September 10, 2007 Yes, aerodynamic drag, gearing, rolling friction, drivetrain losses, blah blah. Torque! //edit: Can you get lbft / ton? Link to comment Share on other sites More sharing options...
RedM Posted September 10, 2007 Author Share Posted September 10, 2007 Cheers everyone. Link to comment Share on other sites More sharing options...
Gerry Posted September 10, 2007 Share Posted September 10, 2007 Or try " http://www.letstorquebhp.com " Link to comment Share on other sites More sharing options...
RedM Posted September 10, 2007 Author Share Posted September 10, 2007 Or try " www.letstorquebhp.com " Well, that's my evening ruined then. Link to comment Share on other sites More sharing options...
wrenlea Posted September 10, 2007 Share Posted September 10, 2007 Or try " http://www.letstorquebhp.com " What an interesting feature It somewhat supports the 280 bhp Jap figure as being only a myth and makes you realise how much slower big passengers can make you Link to comment Share on other sites More sharing options...
Gazboy Posted September 10, 2007 Share Posted September 10, 2007 What an interesting feature It somewhat supports the 280 bhp Jap figure as being only a myth and makes you realise how much slower big passengers can make you Power at Flywheel (BHP) : 276 Weight without Driver (KG) : 1550 Power to Weight Ratio (BHP Per Ton) : 180.92 0 - 60 (Secs) : 5.98 0 - 100 (Secs) : 14.75 60 - 100 (Secs) : 8.77 Quarter Mile (Secs) : 14.30 Terminal Speed (MPH) : 98.47 Drag Strip Quarter Mile (Secs) : 14.20 Drag Strip Terminal Speed (MPH) : 99.58 Vs: Power at Flywheel (BHP) : 325 Weight without Driver (KG) : 1550 Power to Weight Ratio (BHP Per Ton) : 213.04 0 - 60 (Secs) : 5.23 0 - 100 (Secs) : 12.22 60 - 100 (Secs) : 7.00 Quarter Mile (Secs) : 13.50 Terminal Speed (MPH) : 105.09 Drag Strip Quarter Mile (Secs) : 13.40 Drag Strip Terminal Speed (MPH) : 106.28 Link to comment Share on other sites More sharing options...
RedM Posted September 10, 2007 Author Share Posted September 10, 2007 Another thing to help me comprehend. I read in Evo that the Caparo T1 may look blindingly fast on paper but fill it with fluids and a couple of people at it's bhp/tonne is really low. This, apparently, is a problem with all ultra-lightweight cars. How does this compare with fluids and two bods in a Supra? Do they lose as much? Link to comment Share on other sites More sharing options...
Gazboy Posted September 10, 2007 Share Posted September 10, 2007 Well no, two 70kg people isn't even 10% of a Supras weight, yet they about the third of the weight of a Caparo. You'd certainly notice a passenger in a Caterfield where you'd have to be very perceptive (or a bullshitter imo) to notice a passenger in the Supra. Link to comment Share on other sites More sharing options...
RedM Posted September 10, 2007 Author Share Posted September 10, 2007 Well no, two 70kg people isn't even 10% of a Supras weight, yet they about the third of the weight of a Caparo. You'd certainly notice a passenger in a Caterfield where you'd have to be very perceptive (or a bullshitter imo) to notice a passenger in the Supra. I always notice my most regular passenger. She squeals when we go over 70! Link to comment Share on other sites More sharing options...
Pete Posted September 10, 2007 Share Posted September 10, 2007 Well no, two 70kg people isn't even 10% of a Supras weight, yet they about the third of the weight of a Caparo. You'd certainly notice a passenger in a Caterfield where you'd have to be very perceptive (or a bullshitter imo) to notice a passenger in the Supra. The Tiger feels notably more nible without a passenger. Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 11, 2007 Share Posted September 11, 2007 My Skyline is the best part of a second slower round Donington with a 12 stone passenger, than with just me in it. Not only have you got to accelerate an extra 168 pounds, but stop it as well. Link to comment Share on other sites More sharing options...
Gazboy Posted September 11, 2007 Share Posted September 11, 2007 My Skyline is the best part of a second slower round Donington with a 12 stone passenger, than with just me in it. Not only have you got to accelerate an extra 168 pounds, but stop it as well. Exactly, & I bet Pete's Tiger is 4 seconds slower with a passenger. Pete, did you time your laps? Link to comment Share on other sites More sharing options...
Muffleman Posted September 11, 2007 Share Posted September 11, 2007 I always notice my most regular passenger. She squeals when we go over 70! Yeah I've got similar, mine shouts 'Take me home' if you come off a roundabout sideways Link to comment Share on other sites More sharing options...
RedM Posted September 11, 2007 Author Share Posted September 11, 2007 Yeah I've got similar, mine shouts 'Take me home' if you come off a roundabout sideways Does your also lean across to take a pointed look at the speedo? Link to comment Share on other sites More sharing options...
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