Power to weight ratio of your car?

InvaderGIR said:
It is a pointless thread, as was pointed out in the first page, and now it has made it to a sticky...just whut.
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By your reasoning there is no point in ever discussing power figures because all cars weren't measured on the same rolling road, on the same day at the same temperature.

We might as well discount manufacturers claimed power outputs too.
 
Overlag said:
how?
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fly bhp which is pub talk. Wheel HP is what really matters but unless you have done a dyno I guess it's hard to work out. Flywheel, lightened pulleys, PAS delete, electric water pump etc.

One guy got 213 bhp out of a built SR20DE but makes 192 bhp at the wheels (10% loss) beccause he has hardly any transmission loss. A lot of the 4wd stuff will be in the 25%+ region once the horsepower hits the ground totally flipping the charts upside down.
 
mk1_salami said:
By your reasoning there is no point in ever discussing power figures because all cars weren't measured on the same rolling road, on the same day at the same temperature.

We might as well discount manufacturers claimed power outputs too.
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Discussing is fair enough, making a thread that is full of inconsistencies and rubbish numbers a sticky is just, well, retarded...especially as a large number of posts appear to have been missed with your 'comprehensive list'.
 
InvaderGIR said:
Discussing is fair enough, making a thread that is full of inconsistencies and rubbish numbers a sticky is just, well, retarded...especially as a large number of posts appear to have been missed with your 'comprehensive list'.
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Ummm it is a comprehensive list of everyone who has posted their car details in this thread. I'd also like you to show me the large number of posts that has been missed? Look, this isn't my job, and I or the OP never intended it to be the bible of power to weight ratios. What it does though, is give everyone an idea of the speed / power of everyone's car on the board.

It will never get any more scientific than this. You could say the same about the G meter 0-60 sticky, or the 1/4 mile table because they weren't conducted on the same surface at the same drag strip, on the same day when the sun was at 4 o clock in the sky and the temperature was 10c.

Problem??
 
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Jesus there's some anal people in here. It's just a bit of fun. Why not make it a sticky? You dont have to join in if you dont like it. Let's stop moaning that all the figures are not accurate to 5dp measured in controlled conditions to Lloyds approved test procedures and witnessed by a representative from the Royal Society and the Queen, m-kay?

:)
 
Raymond Lin said:
Yaris SR - 131bhp/980 kg =133.67bhp/tonne

Can I round it up to 134bhp/tonne? :D
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Thats actually a really impressive power to weight ratio - how comes its so slow with a power to weight ratio like that? I'd be expecting more than 9 seconds to 60 out of it, thats about what my old Mondeo did it in and that was 110bhp/tonne..
 
[TW]Fox;19544067 said:
Thats actually a really impressive power to weight ratio - how comes its so slow with a power to weight ratio like that? I'd be expecting more than 9 seconds to 60 out of it, thats about what my old Mondeo did it in and that was 110bhp/tonne..
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can only assume its due to crap gearing or something.
 
[TW]Fox;19544067 said:
Thats actually a really impressive power to weight ratio - how comes its so slow with a power to weight ratio like that? I'd be expecting more than 9 seconds to 60 out of it, thats about what my old Mondeo did it in and that was 110bhp/tonne..
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I was thinking the same thing, takes the same time to 0-60 as mine does. Impressive but questionable.

MrLOL said:
can only assume its due to crap gearing or something.
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Yaris has close ratio gears, doubt it'd be that.
 
MrLOL said:
can only assume its due to crap gearing or something.
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No it's because the car most likely puts down a totally crap figure to the wheels. Fox's old mondeo most likely didn't have all the crap modern cars have sapping power. Another option could be that the book figure is to reduce insurance premiums. The Peugeot 306 Gti-6 has a book figure of 8.5 seconds but its power to weight is more like 150ish.
 
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adam cool dude said:
No it's because the car most likely puts down a totally crap figure to the wheels. Fox's old mondeo most likely didn't have all the crap modern cars have sapping power. Another option could be that the book figure is to reduce insurance premiums. The Peugeot 306 Gti-6 has a book figure of 8.5 seconds but its power to weight is more like 150ish.
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the low book figure seems possible

after all, how many times has somebody actually hooked up a G meter to a yaris SR to and thrashed the hell out of it to see how fast it actually does it ? :p
 
Vita said:
I was thinking the same thing, takes the same time to 0-60 as mine does. Impressive but questionable.



Yaris has close ratio gears, doubt it'd be that.
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it could be..... if you have to grab 3rd before you get to 60 the time will be terrible.
 
Overlag said:
it could be..... if you have to grab 3rd before you get to 60 the time will be terrible.
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2nd gear redline in my yaris takes me shy of 60, probs 58/59. So do have to change to 3rd for 60. But 1st/2nd/3rd are the best gears in the Yaris. 4th/5th suck.
 
yes, so the extra gear change adds time to the 0-60 making it worse...? correct?

I can get to about 62mph in 2nd, hence the 6.9sec 0-60 time :) and I've done 7.09, 7.1 and 7.09 on my 3 attempts so I'm not far off :D
 
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