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Author Topic: BMW M4  (Read 2085 times)

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Anaxilus

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Re: BMW M4
« Reply #10 on: January 08, 2015, 08:55:46 PM »
Yup Jason. That's why it takes more skill to drive properly on the street than on a track. Way more environmental factors in less than ideal conditions. People's psychology is usually reversed on this point.

Looking at the M4, looks like they use 'Active M Diff' which is highly reliant on electronics and DSC for input. Congratulations, the cheap ass Torsen in my Toyota is probably a better street diff than your $80,000 BMW's when the nannies are off (as long as the wheels are on the ground).

http://www.bimmerfile.com/2011/09/28/the-active-m-differential-in-detail/
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Anaxilus

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Re: BMW M4
« Reply #11 on: January 08, 2015, 09:08:39 PM »
AWD doesn't have much to do with it. It's the relative torque distribution. Lambo uses pretty much the same AWD systems as Audi but they oversteer crash all the time due to the 90% to the rear bias under certain conditions.  Most Audis are usually locked in around the 40/60F-40/60R bias range. This is why Lambo made the new Huracan understeer to keep their dumb poser clients from crashing all the time.
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AZ

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Re: BMW M4
« Reply #12 on: January 08, 2015, 09:11:18 PM »
   Damn thing doesn't even have to be all that powerful. RWD is the key here. All owners of 500hp Civic's would confirm;-).
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hendric0

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Re: BMW M4
« Reply #13 on: January 08, 2015, 09:17:00 PM »

Quote from: Anaxilus on January 08, 2015, 09:08:39 PM
AWD doesn't have much to do with it. It's the relative torque distribution. Lambo uses pretty much the same AWD systems as Audi but they oversteer crash all the time due to the 90% to the rear bias under certain conditions.  Most Audis are usually locked in around the 40/60F-40/60R bias range. This is why Lambo made the new Huracan understeer to keep their dumb poser clients from crashing all the time.
lol..
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Anaxilus

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Re: BMW M4
« Reply #14 on: January 08, 2015, 09:21:01 PM »
Doesn't need to be a 500hp Civic. I've spun a 100hp FWD Corolla before when I was young and knew shit about cars. Unequal length driveshafts+El Nino+lift off throttle=Hydroplaning 720.

When I was driving it home for the first time, I almost spun my old 6.0 V12 Jag into wall at 20mph around a 90 degree right hander due to old skinny rear tires and no rear stabilizer bar. Hooray for left foot braking.  ;)
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Marvey

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Re: BMW M4
« Reply #15 on: January 08, 2015, 09:44:06 PM »
What I'm wondering is if the electronic diff goes full retard and loses any limited slip capability once the computer is 100% off.  Why I am thinking Airbus?
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Anaxilus

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Re: BMW M4
« Reply #16 on: January 08, 2015, 09:56:55 PM »
Quote from: marvey on January 08, 2015, 09:44:06 PM
What I'm wondering is if the electronic diff goes full retard and loses any limited slip capability once the computer is 100% off.  Why I am thinking Airbus?

Even if it doesn't go full retard, it's obvious BMW engineered the performance package and overall balance to perform optimally with use of electronics. The only benefit of 'all off' on these modern BMW M's and AMG's seems to be for Chris Harris and Jeremy Clarkson to drift around a circuit for cool videos and ratings.
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Grahame

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Re: BMW M4
« Reply #17 on: January 08, 2015, 10:18:45 PM »
You don't need fancy technology to "muck" up
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Anaxilus

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Re: BMW M4
« Reply #18 on: January 08, 2015, 10:32:38 PM »
Quote from: Grahame on January 08, 2015, 10:18:45 PM
You don't need fancy technology to "muck" up

I think that's exactly what we're saying.
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Marvey

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Re: BMW M4
« Reply #19 on: January 08, 2015, 10:59:44 PM »
Low tech helps a lot. I had a lot of suspension work done on my Mustang including differential, subframe connectors, torque arm, panhard rod, 4-point cage, front K-frame, coil-over, brakes, before I added significant power. Gotta make sure you can put the power down.
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