Torque vs BHP
06 November 2010, 08:32 AM
#61
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06 November 2010, 10:03 AM
#62
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I am loving it mate and the gearbox and engine are awesome, it's the best car I've ever owned and feel it's not too flashy but still looks sporty. I haven't posted any pics up as I don't know how to blur the number plate.
The only problem I have is driving like a fanny near pot holes in the fear of cracking an alloy. I can't seem to get an answer to if it's the poor alloys, tyres, suspension or something else. I only want to know so I can either change the tyres or buy a different set of alloys.
The only problem I have is driving like a fanny near pot holes in the fear of cracking an alloy. I can't seem to get an answer to if it's the poor alloys, tyres, suspension or something else. I only want to know so I can either change the tyres or buy a different set of alloys.
You got 19s? Are they M Sports? These are the worst for problems. Lots sticking 17s with Winter tyres on for the next 6 months or so. Some BMW alloys are very solid but usually in smaller sizes. Had mine properly refurbed (overnight chemical treatment, proper lacquering, etc) and they now look new but only 17s and about 15 spoke so a total biyatch to keep clean!!
06 November 2010, 01:08 PM
#63
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Torque curves and power curves are not the same, which is what you were pointing out in an earlier post. Its the power curve you look at to work out gear shift points for maximum acceleration.
06 November 2010, 05:32 PM
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Sorry mate, i can't make out what you are saying here, are you saying that a torque curve has no relation to a power (bhp) curve? Is so, then you are wrong, or are you referring to my point that the peak torque on a 335d is 400ft/lbs at 2000 rpm, but is not the optimium point at which the car could accelerate (using a hypothetical CVT gearbox), and i suggested that this would be 300ft/lbs at 4500rpm? Torque and BHP are two different measurements of the same thing, you do know that, right, the curve or graph of one determines the curve or graph of the other. Bear in mind, my figures were hypothetical.
Ok, here's my point using your prefered measurement:-
400ft/lbs@2000rpm=152bhp.
300ft/lbs@4500rpm=257bhp.
The result is the same.
or the S2000 example
153ft/lbs@7500rpm=218bhp
145ft/lbs@8500rpm=234bhp
The result is the same. My point is the same whatever measurement used.
If you know the torque curve only, then you can work out the BHP at any given point in the RPM range, and vice versa.
(BHP meaning power)
Last edited by gallois; 06 November 2010 at 05:35 PM. Reason: adding 'BHP meaning power'
06 November 2010, 08:14 PM
#66
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I am saying that torque plots and power plots are not the same. Of course they have a relationship but that isn't the point. The point that I am trying to say is that if you want to accelerate a car as quickly as possible you only need to reference power curves and don't need to know about the torque to work out where your best gear and shift points are for maximum acceleration at any given speed. The fact that once you know the best spread of power (best area under the power curve between 2 rpm (shift) points) you can then also work out what the torque is at those points is irrelevent IMO.
There you go, I'm done
There you go, I'm done
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