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Old 08-26-2012, 06:31 PM   #1
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How Can This Be?

I was reading through the July 12 M/T mag and it had a road test review on the 2013 BMW M5. Their performance numbers showed this 550hp/500 ft lb 4384lb curb weight car running the 1/4 mile in 11.9 @ 120.3 mph. How can a heavier car with 56 ft lbs less torque obtain these numbers? The numbers, to me, do not seem out of line. I just wonder why we have not seen any numbers like this with the ZL1. Seems like the ZL1 should be at worst equal.
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Old 08-26-2012, 06:34 PM   #2
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The twin turbo V8 is probably putting down more power than you think. Combine that with an 8-speed DCT and you have your sub 12 sec quarter mile. Only cost $90k.
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Old 08-26-2012, 06:36 PM   #3
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GM also said that the ZL1 had run at 11.9 , so....
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Old 08-26-2012, 06:40 PM   #4
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it has to do with the "power and torque under the curve". Peak torque with these twin turbo BMWs and MBs is barely above idle and with the ZL1 it is at 4200rpm...huge real world difference. That equates to a few tenths in the 1/4 mile.
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Old 08-26-2012, 06:40 PM   #5
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its all has to do with how the engine was built. The dyno sheet between the BMW V8 and the Chevy V8 must look different although they achieve similar horsepower. For example the torque curve must be different and possibly better in the BMW.

The other MAJOR factor is the transmission.
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Old 08-26-2012, 07:32 PM   #6
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Weird also...MT pulled a 12.1 with the Zl1 and nobody is pulling that at the track
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Old 08-26-2012, 07:56 PM   #7
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Anyone know if MT used corrected numbers?
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Old 08-26-2012, 08:03 PM   #8
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Quote:
Originally Posted by Rubble2240 View Post
Weird also...MT pulled a 12.1 with the Zl1 and nobody is pulling that at the track

There's a LOT of variables, which is something that people can't understand. The Chevy 11.9 and Motor Trend's 12.1 were probably under ideal conditions with a PROFESSIONAL driver behind the wheel.

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Old 08-27-2012, 05:26 AM   #9
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MT showed the 12.1 on the best drivers car drag race
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Old 08-27-2012, 08:54 AM   #10
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I think most magazines use a correction formula for their exceleration numbers.
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Old 08-27-2012, 10:40 AM   #11
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I posted the motor trend vid of the new m5 in the general section awhile back. That car is a beast and a big luxury pig. I get what ur saying OP, and I still believe the zl1 is leaving something on the table. I think any of the V series cars could take the Z, and that should not be either?
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Old 08-27-2012, 12:53 PM   #12
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High performance BMWs are always heavy and fast. Check out the transmission gear ratios compared to our Tremec 6060 ratios. That is an important part of the story. The BMW "M" cars usually have very aggressive gear ratios for the first 2-3 gears to get their cars out of the hole and on down the track. Plus they often have a high redline so that they can pull that better gear ratio a little longer between shifts. Its a deadly combo - better gearing for acceleration and higher redlines to leverage it.

Oh - And it really ticks me off too!
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Old 08-27-2012, 01:58 PM   #13
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BMW M5 »
» Overview
» Photos & 360° View
» Specs
» Prices w/Options
2013 BMW M5
Specifications
List price est $100,000
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Curb weight est 4288 lb
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Wheelbase 116.7 in.
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Length 193.3 in.
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Width 74.4 in.
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Height 57.3 in.
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Coefficient of drag 0.33
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Engine & Drivetrain
Type alum. block & heads, variable valve timing & lift, dohc 4-valve/cyl twin-turbo longitudinal V-8
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Displacement 4395 cc
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Bore x stroke 88.3 x 89.0 mm
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Compression ratio 10.0:1
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Horsepower (SAE) 560 bhp @ 6000–7000 rpm
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Weight-to-power ratio 7.66 lb/hp
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Torque 502 lb-ft @ 1500–5750 rpm
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Redline/limiter 7200/7200 rpm
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Fueling direct injection
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Recommended fuel premium
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Transmission 7-speed dual-clutch automated manual
* *
Chassis & Body
Layout front engine/rear drive
* *
Body/frame unit steel w/aluminum hood, fenders & doors
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Brakes, f/r 15.7-in. vented, floating & drilled rotors, 6-piston fixed calipers/15.6-in. vented, floating & drilled rotors, 1-piston sliding calipers
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Wheels cast alloy; 19 x 9 f, 19 x 10 r
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Tires Michelin Pilot Super Sport; 265/40ZR-19 102Y f, 295/35ZR-19 104Y r
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Steering rack & pinion, hydraulic assist
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Steering ratio 18.0:1
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Suspension, f/r upper & lower control arms, coil springs, elect. adj tube shocks, anti-roll bar/multilink, coil springs, elect. adj tube shocks, anti-roll bar

Just take a look at its torque numbers and how long it last. When Chevy and ford go turbo insteadp of super chargers prepare for things to get silly fast in a hurry. Also having that extra gear helps move all that weight while still maintaining decent mpg's.
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Old 08-27-2012, 05:09 PM   #14
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LoL..... a sub-12 sec Camaro ZL1 claim by GM........Kinda sounds like a marketing strategy......would you buy a $60,000 Camaro if they told you it runs a 12.65 @ 113mph ??? or would you be seriously more inclined after you saw the GM video about them running a 11.91(or somewhere in that region)......
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Old 08-27-2012, 09:23 PM   #15
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I know the car is capable of an 11.9x run in the right air. Simply put a drag radial on it and I would bet 11.80 in good air. I think most of the mags tested this car in June heat and when tne IAT's climb on this car it feels TOTALLY different. On a dry 60 degree night there is no doubt this car will run an 11.90. Problem is nobody has done this yet. I would guess that will change this fall.
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Old 08-28-2012, 08:21 AM   #16
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easy........Torque Management
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Old 08-28-2012, 08:36 AM   #17
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Maybe the intercooler being small allows for higher IATs at WOT which in turn builds extreme heat and then pulls timing at the top end of the track. (Whoops, strip according to Golden Bear) Has anybody ran a scan of the intake temperature/timing advance to see if this is happening?
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Old 08-28-2012, 08:42 AM   #18
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I have never looked at these drag radial claims the same since reading a GTR forum...

IF you need racing slicks so you can post a comparable time for your horsepower weight bracket your grasping at straws.

THE ZL1 is a better track car around the turns... it's a good car but it's not top dog or even close in the quarter mile give it a year or more and it won't even be top 7 within the 60 110k range
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Old 08-28-2012, 09:40 AM   #19
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I'm not claiming it is or should be top dog in the 1/4 mile. It obviosuly was never intended to be. I'm just saying that for this power/weight it should run a high 11 second 1/4 mile. That's it.

Some good points made in this thread by others.
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