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12-30-2014, 12:51 AM | #89 | |
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12-30-2014, 01:11 AM | #90 | ||
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Enjoyed your review. . I've been saying that these turbo cars need more rubber than what BMW is putting on them for a long time. Agree with you on the tire sizes for e46m3 as 265 square, e9x m3 as 275/35 square. While the e9x setup works pretty well, My 1M does even better with 285/30 square actually! Keep in mind that your car has another 50-60 ft lbs of torque! I threw a set of 315/30 meatballs on 11 " wheels in the rear of my 1M for autocross she really did well, and that's when I realized I finally wasn't spinning the rears! Exiting Turn 7 you want as much mechanical grip as possible in order to get off the corner without wheelspin and to be able to put all the available power to the road, as soon as possible, I agree a 275/295 is a good start for the M4 but I bet 285/315 would be delicious on a set of apex or forgelines if you like. As far as MDM, yes the American version is dumbed down , or at least it has been in the e9x and e8x. Hopefully some of the coders will have a euro version available. The euro MDM is what we should have gotten as well. Enjoyed hearing about the adaptive suspension and where/Why it works best as I know the track well! |
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12-30-2014, 01:22 PM | #91 | |
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There's also a related DIY thread here http://f80.bimmerpost.com/forums/sho....php?t=1061243 |
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12-31-2014, 05:00 PM | #93 |
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OP thanks for sharing! Any lap times for the adaptive vs passive cars? Sounds like you drove both on the same day on the same track so this would be a great data point to have.
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12-31-2014, 07:18 PM | #94 |
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For whatever it is worth I picked up a set of Intercomp scales that I've been wanting for years and got some more data for you:
This is bone stock, everything that came in the car is still in it and nothing else. Manual, cargo net, floor mats. F80 6MT with only options 19s and extended leather. This is COMPLETELY empty of fuel. I literally let it run out on the scales. This is the same scenario but with COMPLETELY full tank of 93oct gas. So exactly 100lbs of fuel. |
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01-19-2015, 08:55 PM | #95 | |
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Since my M4 is my 4 season DD, I am a bit concerned about ground clearance for winter driving, so I am hesitant at installing pure lowering springs. But the HAS do offer an interesting option. Do you think it would be easy to raise the car for the winter and then lower it back in spring? Further, another benefit I see in the K&W HAS is be the possibility to corner balance the car. Have you done so? If yes, what is difficult to achieve? Thanks in advance, I value your insight |
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01-21-2015, 12:14 PM | #96 | |
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I think 315 would be rubbing all over on a lowered car but maybe there is room with just the correct ammount of offset. I think 305 would be good but will try 295 first. too much tire can't get them to optimal temps on such a fast course.
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01-22-2015, 07:18 AM | #98 | |
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Yes I have corner balanced it. Its a breeze and feels solid! I have used coilovers in winter with snow salt and ice. All I can say is after the first year things get a little crusty and harder to adjust. Maybe would be good idea to have some corrosion protection applied to the aftermarket parts.
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01-24-2015, 03:57 PM | #99 |
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Quick question. Do you keep the 12.5mm spacers front, 10mm spacers rear for street driving? I have 19 stock setup, will this work for me?
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01-25-2015, 10:06 AM | #100 |
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actually its other way around. 12.5 in back. yes will work on 19 stock wheels. street is fine.
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01-25-2015, 01:59 PM | #101 |
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01-26-2015, 09:46 PM | #102 |
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Nice write up, agree with most of it. One question, what GT3 are you referring to? If it is the 991 you are wrong about the straight away speed. I have an M4 and 991 GT3. I love the M4, but not in the same league as GT3, even in the straights, the GT3 is considerably faster and pulls much harder. The 991 engine is in a league of its own and a masterpiece as it screams to 9000 rpm. Also the throttle response is much sharper, but the driver is able to put the power down with much more control.
Last edited by Brindle101; 01-26-2015 at 10:02 PM.. |
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01-27-2015, 07:14 AM | #103 | |
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from a roll I suspect the 991 GT3 would be slightly faster than a stock M4 but not by much.
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01-28-2015, 08:17 PM | #104 |
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