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15 Jul 2004, 15:26 (Ref:1037358)
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#1 | |
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Rookie
Join Date: May 2004
Posts: 66
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power to weight ratio
hows it calculated? its most probably easy but i am a muppet so forgive me!!
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15 Jul 2004, 16:34 (Ref:1037417)
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#2 | ||
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Veteran
Join Date: Feb 2000
Posts: 2,188
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power:weight
BHP:Tons Standard Road Car 160BHP:2ton 1ton/2ton x 160BHP =80BHP per ton F1 car 800BHP:0.7ton 1ton/0.7ton x 800BHP =1142BHP per ton |
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__________________
A Saudi saying, "My father rode a camel. I drive a car. My son flies a jet-plane. His son will ride a camel."
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16 Jul 2004, 08:51 (Ref:1037919)
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#3 | |
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Veteran
Join Date: Apr 2002
Posts: 9,710
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my car now . . . .120BHP 765Kg = 158 BHP per ton
when I've spent an arm and a leg on an engine and removed underseal, beergut etc . . . .150 BHP & 730 Kg = 205 BHP per ton (and the oputside possibility of a class win ! |
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16 Jul 2004, 17:05 (Ref:1038354)
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#4 | ||
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Veteran
Join Date: Apr 2004
Posts: 3,810
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supplementary if I may - are these figures usually calculated using 'at-the-wheels' bhp or 'calculated flywheel' bhp ?
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a salary slave no more...
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16 Jul 2004, 19:04 (Ref:1038473)
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#5 | ||
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Racer
Join Date: Feb 2004
Posts: 146
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Usually at flywheel but exludes driver,which in my case seiously affects the final figure.
Engine 132 bhp,car 385 kgs,then me another 100 kgs! Answer,massive diet or massive engine,guess which will win? Lister 
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Rattie,on the road with Mole.Beep,beep!
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17 Jul 2004, 20:55 (Ref:1039227)
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#6 | ||
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Racer
Join Date: Jan 2002
Posts: 207
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Lister your car is very light, what is it exactly?
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18 Jul 2004, 07:37 (Ref:1039444)
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#7 | ||
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Racer
Join Date: Feb 2004
Posts: 146
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I have just checked the set up sheets from Alan Stanniforth and unladen weight is actually lower than I said at 361 kgs or 799 lbs,
Car is a Ginetta G17 Formula 4 single seater,built 1969,space frame, Imp all alloy engine and gearbox. Engine bored/stroked to 1098 running twin 40's and full race cam,gearbox has strengthened casing with a special diff casting , Jack Knight internals and LSD. Used soley for sprints and hillclimbs since built. Lister 
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__________________
Rattie,on the road with Mole.Beep,beep!
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18 Jul 2004, 10:06 (Ref:1039497)
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#8 | ||
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Racer
Join Date: Feb 2004
Posts: 146
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Red dog
It gets even better.
I've just found some corner weights after ride height adjustment following spring rate change. Brian Wingfield Racing 13/08/02 - 782 lbs or 355 kgs. If it goes on likwe this I will be airborne! Lister  
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__________________
Rattie,on the road with Mole.Beep,beep!
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19 Jul 2004, 09:53 (Ref:1040174)
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#9 | |
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Veteran
Join Date: Apr 2002
Posts: 9,710
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flippin hell thats light !
when I add myself to my car it doesnt look so good at all ! 765Kg + 25 (fuel) + 90 (me and kit) = 880kg! thats vauxhaul territory! |
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27 Jul 2004, 18:52 (Ref:1049094)
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#10 | ||
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Veteran
Join Date: Mar 2003
Posts: 3,523
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765Kg, sounds Nova/Corsa-ish.
My ol' Nova was 780 in Super Road Saloon spec, but is now about 760 in ModProd spec, with more to lose. Steve Quenby's used to tip the scales at just over 710 if memory serves me right. Harry weighs 780Kg rolling without the engine, which weighs about 380lb (approx 170Kg),the gearbox, which weighs about 20Kg, the air jacks, which weigh about 20Kg, exhaust headers and system, fuel, oil, water, and other odds & sods, and it's got to be under 1100Kg at the track. BHP - about 740 at the flywheel. Fun fun fun fun fun. And one final shot - BHP at the wheels versus flywheel - for front wheel drive cars with synchro (helical cut gears) gearboxes, lose 21% of your flywheel power through the box and diff. Dog boxes, straight cut, typically 10% loss. For those new to the subject.... Rob. |
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__________________
There is no substitute for cubic inches. Harry Belamonte - 403ci Vauxhall Belmont!! A 700hp wayward shopping trolley on steroids!!
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28 Jul 2004, 13:41 (Ref:1049857)
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#11 | |
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Veteran
Join Date: Apr 2002
Posts: 9,710
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the only vauxhaul I'm likely to race against is a VX4/90, I think they weigh about a ton and a half, plus paint and filler, less corrosion . . .so about a ton and a half !
dunno about rear wheel drive losses though |
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28 Jul 2004, 14:42 (Ref:1049908)
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#12 | ||
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Racer
Join Date: Feb 2004
Posts: 146
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dunno about rear wheel drive losses though
I think it is about the same,you still have all the same components,plus a prop shaft . Lister |
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__________________
Rattie,on the road with Mole.Beep,beep!
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