Question about 545i specs
#21
Originally Posted by Znod' post='244817' date='Feb 23 2006, 12:58 PM
You could be right that a skilled driver could get better times on a dragstrip with a manual, but, of course, I am not sure. For one thing, the Step might be easier to get off the line without excessive wheelspin--given equally competent drivers. In this regard, driving a Step on a dragstrip does require skill--i.e., the Step is not just point and shoot.
And, right the SMG should shift faster and, thus, perhaps, yield better times, but that has not yet been shown to be true. I think the SMG probably is a great track tranny, but I am not so sure that it is a great drag-race tranny. But, be aware that I have never driven an SMG.
Perhaps you can clarify some things for me/us. If one uses LC, then would he or she leave DSC and DTS on or turn these nannies off when drag racing? If they are on, then I would be afraid that off-the-line HP would be lost. If off, then I am not sure that excessive wheel spin would not be encountered using LC. On the other hand, if LC is not used, then one would not be able to brake torque as on a Step--the way I understand things. Whether DSC and DTC are off, the inability to brake torque might be the difference in winning or losing. Regardless, I'd appreciate it if you would describe what you would do if drag racing an SMG.
And, right the SMG should shift faster and, thus, perhaps, yield better times, but that has not yet been shown to be true. I think the SMG probably is a great track tranny, but I am not so sure that it is a great drag-race tranny. But, be aware that I have never driven an SMG.
Perhaps you can clarify some things for me/us. If one uses LC, then would he or she leave DSC and DTS on or turn these nannies off when drag racing? If they are on, then I would be afraid that off-the-line HP would be lost. If off, then I am not sure that excessive wheel spin would not be encountered using LC. On the other hand, if LC is not used, then one would not be able to brake torque as on a Step--the way I understand things. Whether DSC and DTC are off, the inability to brake torque might be the difference in winning or losing. Regardless, I'd appreciate it if you would describe what you would do if drag racing an SMG.
Pfewwww i'm tired.... Sorry i couldn't be more of assistance on the smg problem. A friend of mine once showed me when he used LC on his e46 m3, keeping the - pedal depressed and also the brake but i forgot the whole process.
#22
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Originally Posted by Znod' post='244817' date='Feb 23 2006, 12:58 PM
Perhaps you can clarify some things for me/us. If one uses LC, then would he or she leave DSC and DTS on or turn these nannies off when drag racing?
#23
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Wow, thanks for all the info. When I want a quick start (these days) with my Step, I do mild, hopefully non-abusive, brake torquing and turn both DSC and DTC off. These days I rarely get too much wheel spin. Before 20.01.00, I used to get way excessive wheel spin without brake torquing at all.
#24
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Originally Posted by jet190rs' post='244841' date='Feb 23 2006, 01:41 PM
LC (actually called "Acceleration Assist" on the non-M5 E60s with SMG) can only be activated with both DSC and DTS off. It'd be interesting to see if it indeed assists acceleration time Have any members here timed a 0-60 run using SMG's AA?
grogan545i (Steptronic):
1/8 Speed--80.473
1/8 time--8.650
0 to 60--4.89
The above values are unadjusted for altitude (534') and weather (26F; Dew Point--5 F; Pressure 30.18). To my knowledge, reliable formulas are not available for making such adjustments for anything but 1/4 mile data.
Znod (Steptronic):
Unadjusted for Altitude and Weather:
1/4 Speed--102.71
1/8 Speed--82.45
1/4 Time--13.629
1/8 Time--8.853 (Before 20.01.00, I had 3 8.71's without adjustment and with 55-60F and 1550' altitude)
0 to 60--5.149
Adjusted for altitude (1550') and weather (49F; Dew Point--21 F; Pressure 30) are:
1/4 Speed--104.83
1/4 Time--13.451
Bokke has been learning to drag race his manual 545i and has been doing some related testing. To date, his unadjusted (of course) bests are:
1/8 Speed--77.2
1/8 Time--9.17
0 to 60--5.51 (see CD 5/04 below)
All I know about his altitude and weather are: "Temp:40F; Hum: 27%.")
I posted the following above, but am doing so again for direct comparison. Note that CD adjusts only for weather (pretty low altitude though--usually Michigan) and uses a 3 MPH rollout. In this regard, we all use a 1' rollout. RT uses aggressive, yet not abusive, test procedures, a 1' rollout, and makes no altitude/temperature adjustments. None of us use abusive procedures. MT also adjusts only for weather and uses a 1' roll out.
BMW 545i--Manual CD 5/04 5.5 14.1 102.8
BMW 545i--Steptronic RT 6/05 3814 5.2 13.7 104.0
BMW 545i--Steptronic MT 8/04 5.4 13.7 102.1
BMW 545i--Steptronic MT11/05 5.5 13.8 102.8
#26
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Originally Posted by BetterMakeWay' post='244858' date='Feb 23 2006, 02:00 PM
Can you please enlighten me on the rims question?
#27
Originally Posted by Znod' post='244848' date='Feb 23 2006, 12:52 PM
Bokke has been learning to drag race his manual 545i
#28
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Originally Posted by Bokke' post='244900' date='Feb 23 2006, 03:29 PM
Znod - thanks for being kind....the driver and the car are learning
#29
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Originally Posted by Captain Tenneal' post='244784' date='Feb 23 2006, 09:02 AM
So then why have an SMG tranny? It seems all the advantages of such a system get negated by the better Step.
No way theres not "all the advantages" theres like one... straight line acceleration and thats it, and thats a maybe... Actually to be honest I think if you use Acceleration Assist on the SMG you can bet a better time than the Steptronics but i wouldnt want to beat on the clutch at every stop light... like how you can on a step...
Why the SMG? Cuz you get much better control especially on twisties and in turns. I think the shifts are faster and better even in regular driving mode than the step, it doesnt always upshift to the highest gear, you get crisps shifts with SMG, none of this sloppy lazy shifts that the steptronic does... Its personal preference... I much prefer the manual feeling of a shift with SMG.
With the steptronic even if you slap it over in manual mode the shifts are still not crisps... theres still the torque converter lag/feeling...
#30
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Originally Posted by Znod' post='244798' date='Feb 23 2006, 09:40 AM
I assume you saw my reply on the other thread--about answering your question--not referring to you.