Interesting article on S4 hp and weight...
05-06-2010, 05:00 AM
#1
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Interesting article on S4 hp and weight...
Something we've all suspected- no conclusions in article, but same thought logic....
http://www.sportscarmonitor.com/blog...sed-horsepower
http://www.sportscarmonitor.com/blog...sed-horsepower
05-06-2010, 10:14 AM
#3
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That was my dyno run (you can search the forums for it), but mine was also done at 67 degrees, high humidity, and the engine nice and hot from driving - all much less than optimal factors.
05-06-2010, 11:28 AM
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One thing I have not seen mentioned is that those calculations based on 1/4 mile time, HP, and weight do not take into account the HP/torque curve. A car with high low end torque with the same peak HP will be faster than a car with lower low end torque if they both weigh the same.
05-06-2010, 12:09 PM
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We have mentioned that before in previous conversations....333chp is just not enough to energize a 4000+ car to a 12 sec 1/4 mile, even taking into account friendly of torque curve.
Like i've said before, a 3700lb, 390 "conservatively rated hp" (many dynoed at 370-385 at the wheels- stock) supercharged Cobra did 12.9 in 04. Hp/torque curves are roughly the same the same, 6 speed also.
AWD is not that big a factor, when it is trapping at 109mph either...
I firmly believe this car is underrated.
Like i've said before, a 3700lb, 390 "conservatively rated hp" (many dynoed at 370-385 at the wheels- stock) supercharged Cobra did 12.9 in 04. Hp/torque curves are roughly the same the same, 6 speed also.
AWD is not that big a factor, when it is trapping at 109mph either...
I firmly believe this car is underrated.
05-06-2010, 04:49 PM
#7
Power:Weight ratio
According to the table in this article http://auto.howstuffworks.com/horsepower2.htm
The power-to-weight ratio for a high-performance car, that has 0-60 time of 4.9 sec, is around 0.1.
Since S4 weighs 4000 lb, the horsepower should be about 400hp.
The power-to-weight ratio for a high-performance car, that has 0-60 time of 4.9 sec, is around 0.1.
Since S4 weighs 4000 lb, the horsepower should be about 400hp.
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05-06-2010, 04:55 PM
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According to the table in this article http://auto.howstuffworks.com/horsepower2.htm
According to that article, a DSG S4 weighs 3924 lbs. plus say 5 gallons of gas is about 40 lbs. plus say a 200 lb. driver would equal 4164 pounds times .1045 equals...435.138! What?
Even just use the car weight of 3924 and it comes out to ~410.
Odd. Something's wrong there. Probably the multiple I assume.
Last edited by LeadToRome; 05-06-2010 at 05:06 PM.
05-06-2010, 05:33 PM
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I have seen road logs from 3 6MT B8 S4 cars that put the WHP in the 290-300 WHP range. There is no way that a 333 CHP AWD car can make 300 WHP.
one log (dgibbs)
http://forums.quattroworld.com/s4b8/msgs/3457.phtml
two logs (mine and Keith from APR)
http://forums.quattroworld.com/s4b8/msgs/6305.phtml
dgibbs is measured with a VAG (VCDS). Keith used a Racelogic Pbox (GPS based. I used a Gtech RR (accelerometer based).
Bruce
one log (dgibbs)
http://forums.quattroworld.com/s4b8/msgs/3457.phtml
two logs (mine and Keith from APR)
http://forums.quattroworld.com/s4b8/msgs/6305.phtml
dgibbs is measured with a VAG (VCDS). Keith used a Racelogic Pbox (GPS based. I used a Gtech RR (accelerometer based).
Bruce