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      07-23-2013, 11:28 AM   #89
PTA85
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Quote:
Originally Posted by Jblack4083
The noise. Everyone complains about it... I don't think its a bad sounding car. It seems like while daily driving this on the street it will have a very good sound presence with its deep and bassy exhaust. The E9X sounds amazing in the upper RPMs but really lets down when doing casual driving on the street. I've always liked how the E9X M's sound like a fast car, far away, even when they're close to you but sometimes its underwhelming.

This car sounds great and will command a presence at all RPMs it seems. What's interesting is that the prototypes dont all sound the same...

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Originally Posted by PTA85 View Post
at 3:08 Not sure if it is another car but when he gets off the gas and on the brakes you can hear the blow-off valve pretty clearly. Might be imagining things lol.
That noise is most likely the ceramic brakes. I could be wrong but I believe the BMW turbo engines use diverter valves not blow off valves.
Yeah, wasn't sure if they used blow off or diverter Valves. That car sure is planted though.
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      07-23-2013, 12:19 PM   #90
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what really worries me is the long term reliability of the so called new technology turbo engines, just had bad experience with chronic issues on other turbocharged cars.
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      07-23-2013, 12:54 PM   #91
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what really worries me is the long term reliability of the so called new technology turbo engines, just had bad experience with chronic issues on other turbocharged cars.
As opposed to, say, the bomb proof, cost effective ownership of the n/a motor in the e39m5?

Anything with an m is going to be complex and expensive to fix, except for the e36 332I, er, m3
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      07-23-2013, 12:56 PM   #92
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I'm not sure if this has been mentioned before, but it looked like the dark car had saddle leather!!!!
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      07-23-2013, 03:07 PM   #93
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Quote:
Originally Posted by Boss330 View Post
Added this new video of M4 testing in original post

Hmmmm how many up shifts do you count there Boss man?

Note to aftermarket tuners: get working on those short ratio diff's, a BMW provided gold mine
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      07-23-2013, 03:49 PM   #94
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Hmmmm how many up shifts do you count there Boss man?

Note to aftermarket tuners: get working on those short ratio diff's, a BMW provided gold mine
As I said in a previous post; Turbo cars tend to have longer gears since they often have a broader useable rev range than a highly tuned NA engine. With your love of turbo cars, I'm sure you appreciate that...
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      07-23-2013, 04:16 PM   #95
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As I said in a previous post; Turbo cars tend to have longer gears since they often have a broader useable rev range than a highly tuned NA engine. With your love of turbo cars, I'm sure you appreciate that...
Which is also part of the uninspiring racing sound. When you start your gear run at 2.5k rpm instead of 4.5k rpm it will sound a lot lazier and boring accelerating out of a curve indepedent on what gear you are in or how long it is. Welcome to torque racing... Let's face it, it sucks from an audio excitement point of view compared to a NA screamer but the power will be impressive and there still seem to be a nice top end to explore. And this chassi...oh yeah.
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      07-23-2013, 04:22 PM   #96
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I was hoping more aggression in sound department.
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      07-23-2013, 04:55 PM   #97
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Looks much flatter than testing with the E9x series...
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      07-23-2013, 05:02 PM   #98
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Originally Posted by solstice View Post
Which is also part of the uninspiring racing sound. When you start your gear run at 2.5k rpm instead of 4.5k rpm it will sound a lot lazier and boring accelerating out of a curve indepedent on what gear you are in or how long it is. Welcome to torque racing... Let's face it, it sucks from an audio excitement point of view compared to a NA screamer but the power will be impressive and there still seem to be a nice top end to explore. And this chassi...oh yeah.
Very true.
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      07-23-2013, 05:10 PM   #99
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Quote:
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As I said in a previous post; Turbo cars tend to have longer gears since they often have a broader useable rev range than a highly tuned NA engine. With your love of turbo cars, I'm sure you appreciate that...
Nope, I like a close ratio box....always. Helps with the lag you understand

Flippin M6 does 110mph in 3rd......and yes it has a nice flat torque wave to make that work, but boy does it make the car boring!!!! (for a 560horse M Car)

I have a feeling 6th and 7th in M3/M4 will be a wasted gears too. all for an extra 3 mpg
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      07-23-2013, 05:17 PM   #100
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Quote:
Originally Posted by Kayani_1 View Post
I was hoping more aggression in sound department.
Don't forget we are only hearing the external sounds.....might sound a whole lot different in the driving seat. We can only hope
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      07-23-2013, 05:57 PM   #101
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Quote:
Originally Posted by NISFAN
Quote:
Originally Posted by Kayani_1 View Post
I was hoping more aggression in sound department.
Don't forget we are only hearing the external sounds.....might sound a whole lot different in the driving seat. We can only hope
Only because they are piping in a flat plane S65 ALMS engine song.

T
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      07-23-2013, 06:26 PM   #102
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Quote:
Originally Posted by NISFAN View Post
Nope, I like a close ratio box....always. Helps with the lag you understand

Flippin M6 does 110mph in 3rd......and yes it has a nice flat torque wave to make that work, but boy does it make the car boring!!!! (for a 560horse M Car)

I have a feeling 6th and 7th in M3/M4 will be a wasted gears too. all for an extra 3 mpg
Hmmm. I've never used 7th at the track and would welcome a gear that doesn't mean well over 3k cruising on the freeway and the fuel savings that come with it. The rest of the ratios should be tight but a long 7th makes better sense than what we have now.
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      07-23-2013, 07:04 PM   #103
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No it doesn't.
I'm pretty confident that I know what I am thinking

Tell me what frequency you would hear from an I6 @ 8000 RPM. Any idea?

I'll give you a hint: 400 Hz


It's actually pretty easy to correct for the Doppler effect and estimate the RPM given that we know the engine architecture and vehicle velocity.
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      07-23-2013, 07:10 PM   #104
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Check out the video at 3:07

1. Try to match the frequency of the observed sound which I estimate is around 350 Hz.

2. Figure out the speed of the car away from camera. It sounds like the top of 3rd gear which should be around 90-100 mph depending on gearing.

3. Correct for Doppler effect. Easy if you can Google. http://www.wolframalpha.com/input/?i...400Hz%2C+90mph

So again, it sounds pretty close to 8000 rpm. It's way better than a guess.
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      07-23-2013, 09:05 PM   #105
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^
You are actually serious.
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      07-23-2013, 09:19 PM   #106
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The sound of the F82 M4 will never compare to the E92 M3 (I don''t mind as much) so let's just stop complaining about it. Though, at 1:07 before the mini Karusell, it sounds like a vintage screaming I6.

I'm all for pushing the envelope of technology so long as the driving experience that BMW has given us is still there. Just look at Porsche with the new GT3 (highly probable to be next car) and the outcry from loyalist over the PDK, EPS and RWS without even driving it yet the actual driving reviews say otherwise. I say let us judge the car when it comes, then we can talk praise/criticism.
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      07-23-2013, 10:44 PM   #107
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Quote:
Originally Posted by Boss330 View Post
As I said in a previous post; Turbo cars tend to have longer gears since they often have a broader useable rev range than a highly tuned NA engine.
The reason is more simply because of the massive torque. The current car has a very broad power band with a very high percentage of peak torque across a wide swath of rpm, but its relatively low CRANK torque must be significantly gear multiplied to achieve a desired acceleration. A turbo car does not have that requirement and thus to have improved fuel efficiency will have numerically lower gears/final drive ratios.

NISFAN: As is typical with a final drive modifications one here for the M4 will help some performance contests and hurt others and when considering results say on a strip or track across a wide variety of gears overall it will be a wash. There is no such thing as a free lunch and altering a FD ratio simply does not give one a single speck more power and that is what matters.
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      07-24-2013, 05:07 AM   #108
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everyone is complaining about how weak or burpy the stock exhaust note is.

because the exhaust note was so perfect on the e92 that no one went aftermarket...

have you guys not heard the f30 335i exhaust by meisterschaft let the aftermarket men do their work!

i am as much excited for what the brands can do to this car as the car itself.
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      07-24-2013, 02:45 PM   #109
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Quote:
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The reason is more simply because of the massive torque. The current car has a very broad power band with a very high percentage of peak torque across a wide swath of rpm, but its relatively low CRANK torque must be significantly gear multiplied to achieve a desired acceleration. A turbo car does not have that requirement and thus to have improved fuel efficiency will have numerically lower gears/final drive ratios.

NISFAN: As is typical with a final drive modifications one here for the M4 will help some performance contests and hurt others and when considering results say on a strip or track across a wide variety of gears overall it will be a wash. There is no such thing as a free lunch and altering a FD ratio simply does not give one a single speck more power and that is what matters.
Not so fast....the old long gear ratio, but less gear change time wastage vs. time lost gear changing, but tighter gear multiplication groups doesn't work out so well in DCT land. The time a DCT changes gear in, is so much shorter that there isn't the pause in performance that counts against the general advantage of having smaller drops in torque multiplication......plus there is absolutely nothing sporty about being able to lap a track using only 2 maybe 3 gears, regardless of how fast it is, it is not good.

For info the M6 does 40mph in top gear, that is a theoretical 288mph geared speed. Tell me that wouldn't benefit from having a shorter gear set?

Furthermore anyone who supports the fact that turbo's provide significant lag, will also support that there are occasions, like coming out of a corner, where there isn't boost, and therefore torque to carry a long ratio......just teasing on this one
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      07-24-2013, 04:10 PM   #110
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.....plus there is absolutely nothing sporty about being able to lap a track using only 2 maybe 3 gears, regardless of how fast it is, it is not good.
That's exactly what you can do at the BMW Performance track in SC. You spend 99% of your time in 2nd and 3rd, only needing 4th very briefly in one section of the track.

If you're in the M5/6 you could probably spend most of that time in 3rd with all that torque.
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