09-09-2008, 05:42 PM | #23 |
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+1.
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01-20-2009, 03:23 PM | #24 |
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i knw its old thread but guys my x6 now i cant get under 7 sec !! i dunno why the best i get 7.1 the rest 7.4, 7.7 i remember when i reached 1000km i did get 6.5 thats a huge difference ? what do u think guys
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01-20-2009, 03:28 PM | #25 | |
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BTW Deda what's your time you have an 3.5d right? |
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01-20-2009, 04:28 PM | #26 |
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yea man thats really anoying !! i raced my brother x5 again its dead even ? but before i used to give him a head start and today i tried maybe 10 times 0-60 the best i got 7.1 there is something wrong goin on
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01-20-2009, 04:29 PM | #27 |
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01-20-2009, 04:57 PM | #29 |
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did you change your wheels since last time ?
do you have a tank full this time and didn't last time ? try giving it a few miles of WOT before racing they say it can help ??
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01-20-2009, 05:11 PM | #30 |
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wheels no .. about the tank it doesnt make differenect 2day it was 50km range so its half empty i tried also after full tank same result WOT what do u mean i didnt get it ...
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01-20-2009, 05:18 PM | #32 |
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hmmm yea i raced my brother alot so i pushed it to the limits .. but i dunno whats the problem i can also feel the decrease in the performance .. did u try ur'z wht did u get ?
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01-20-2009, 05:44 PM | #33 |
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never really tried it against something in the same league other than a short run against a member here in his 4.8i ... it was a close call but the X6 won by a short difference
i tried it also with a denali and a nissan armada with the X6 disappearing in the horizon :P but am not getting any lose in power ( al 7md llah) maybe you need an oli change ??
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01-20-2009, 06:51 PM | #35 | |
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1. You generally lose grip when it is cold, and this will also affect your speed. If you are an F-1 fan or into motor racing, I am sure you must have heard of bringing tyres to the right temperature. 2. You lose tyre pressure when it is cold and that in turn affects the speed of the vehicle due to reduction in the circumference of the tyre. If you pay close attention to your fuel economy you will notice the effect of the low tyre pressure. 3. The low tyre pressure also affects your inertia at start off which affect start off acceleration. |
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01-21-2009, 04:23 AM | #36 |
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01-21-2009, 09:00 AM | #37 | |
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I don't see how you save gas because the fuel injectors shut off completely when you are slowing down with the throttle fully closed. On an old carbureted engine it might make a small difference. (And not to be picky, but you slow down using brakes, not breaks.) |
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01-21-2009, 09:09 AM | #38 |
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Not significantly in a turbo engine. The turbo is capable of compressing incoming air much more than it is allowed to do. If the air is warm, the ECU simply allows a higher turbo pressure to pump the full mass of air into the engine. If the air is cold, the turbo pressure is limited to that which once again provides the ideal air mass. The ambient temperature would have to be well over 100F before you detected any difference in horsepower, and that would just be because the intercoolers have a finite ability to cool the compressed air.
Turbos compensate in the same way for altitude, so turbocharged engines develop the same horsepower at height as they do at sea level. In case you missed the bold text , it is all to do with air mass, which is independent of temperature or pressure. |
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01-21-2009, 11:29 AM | #39 | |
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On my previous car, switching into neutral made a big difference in gas consumption. Now on the BMW, there is no noticeable difference. I agree with you that you might loose valuable fractions of a second IF you needed to accelerate and you had to put the car back into drive. However I only used to do this when I was approaching an intersection and I knew that the light would change to red or was red and there was NO other traffic around. In other words it was safe to do so. The other advantage this gave me was that shifting the car into neutral would let the car roll a LOT further than in drive with closed throttle due to no engine braking (not breaking)... So when I was approaching an intersection that was changing to red and I was a few hundred meters out, I would simply take my foot of the accelerator, shift into neutral and let the car roll until the light turned green again at which point i put it back into drive and slowly apply the accelerator again. That way the car would only slow down by a few km/h and the transitions were so smooth that you wouldn't even know that I had done this if you were a passenger in the car! This is assuming the street is level (and that is the only place I did this anyway...) Basically it's similar to depressing the clutch in a standard car and letting the car roll....
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