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Old 09-24-2013, 05:58 PM   #1
terps
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Thumbs up New M4/M3 tech stats revealed (430hp, 370tq, 3300 lb)

BMW M4 and new M3 specs revealed:

http://f80.bimmerpost.com/forums/sho...d.php?t=892746

430hp, 370lb-ft tq with a power to weight of 7.8 lb/hp
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Old 09-24-2013, 06:14 PM   #2
OrbitalEllipses
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gdamn 7.8lb/hp
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Old 09-24-2013, 06:28 PM   #3
WRXHillClimb
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Sweet, if they get under 3300lbs I'll be impressed.

Two parts I think are unfortunate but not unexpected:

two mono-scroll turbochargers (why no big twinscroll?)
Higher than 7500 RPM redline (lets hope... that's kinda standard redline now...)
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Old 09-24-2013, 06:41 PM   #4
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Quote:
Originally Posted by WRXHillClimb View Post
Sweet, if they get under 3300lbs I'll be impressed.

Two parts I think are unfortunate but not unexpected:

two mono-scroll turbochargers (why no big twinscroll?)
Higher than 7500 RPM redline (lets hope... that's kinda standard redline now...)
Are you serious? The power potential of twins is generally going to be much greater, with less risk of lag at inflated power levels vs a big single. Take the n54 vs n55. Theres a reason the 1m and the is models kept the n54, while the rest got the twin scroll n55. Theres no comparing those engines unless its stock to stock.

Not familiar with all the specs on this engine...but i hope it's a big step up from the n54. Although im not sure how much it could be, as that thing is already mostly forged and built like a brick **** house.

Hopefully its turbos are significantly bigger, such that theres headroom to make more power. All the tt 335/135 cars are at 400 on a chip, and 430+ with boltons, all at a similar weight. That might hurt sales vs. this thing at 65-80k.

Last edited by SoapBox; 09-24-2013 at 06:48 PM.
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Old 09-24-2013, 06:50 PM   #5
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They for real with that interior? My e36 looked better...

Quote:
Are you serious? The power potential of twins is generally going to be much greater, with less risk of lag at inflated power levels vs a big single. Take the n54 vs n55. Theres a reason the 1m and the is models kept the n54, while the rest got the twin scroll n55. Theres no comparing those engines unless its stock to stock.
True but it is also a whole hell of a lot more complex.
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Old 09-24-2013, 06:56 PM   #6
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Quote:
Originally Posted by WRXHillClimb View Post

They for real with that interior? My e36 looked better...

True but it is also a whole hell of a lot more complex.
Why would you prefer a single twin scroll on a 3.0l engine then? Thats a huge bottleneck trying to move enough air at the 400-500 hp mark.
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Old 09-24-2013, 07:02 PM   #7
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Quote:
Originally Posted by SoapBox View Post
Why would you prefer a single twin scroll on a 3.0l engine then? Thats a huge bottleneck trying to move enough air at the 400-500 hp mark.
I suppose it is extremely nice having a single exhaust bank for both turbos, which is an awesomely unique characteristic of the i6 (which I'm happy as HELL to see back in the car, although the v8 was still an engineering marvel).
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Old 09-24-2013, 07:26 PM   #8
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Quote:
Originally Posted by WRXHillClimb View Post


They for real with that interior? My e36 looked better...
Yeah. No it didn't.
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Old 09-24-2013, 07:43 PM   #9
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Sounds like it's going to be a nice car. Not digging the interior though.
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Old 09-24-2013, 08:47 PM   #10
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The interior... is a 3 series interior. What else would you expect?

I'm a little disappointed in the power figures, though I know it will be hugely underrated anyhow.

The weight claim, however, is shocking. It will scoot.
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Old 09-24-2013, 09:20 PM   #11
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Holy fast.

Interior = just fine
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Old 09-24-2013, 09:32 PM   #12
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The weight is very impressive, among many other improvements. Huge increase in torque, thank you FI. Well done BMW.
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Old 09-24-2013, 09:40 PM   #13
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The weight is likely not curb weight, or unladen that BMW uses. They said that it's 80kg lighter than the previous gen, which would make it over 3500lbs in curb weight.
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Old 09-24-2013, 10:15 PM   #14
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i see 550hp easy with this engine, even with 3500lbs with that kind of potential in power it should be a tire smoking hotness
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Old 09-24-2013, 10:37 PM   #15
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Quote:
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The weight is likely not curb weight, or unladen that BMW uses. They said that it's 80kg lighter than the previous gen, which would make it over 3500lbs in curb weight.
About the weight, this is what I just read in that thread:

"The new model weighs about 175 lbs less than its predecessor and comes in at just below 3300 lbs (with a 90 per cent full tank of gas, but no driver)."
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Old 09-24-2013, 11:47 PM   #16
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Quote:
Originally Posted by terps View Post
About the weight, this is what I just read in that thread:

"The new model weighs about 175 lbs less than its predecessor and comes in at just below 3300 lbs (with a 90 per cent full tank of gas, but no driver)."
So that makes the current M3 well below 3500lbs? But BMW website used to show something like 3700lbs for the E92 M3. Methinks there is some marketing BS going on here.
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Old 09-25-2013, 12:29 AM   #17
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Quote:
Originally Posted by OrbitalEllipses View Post
gdamn 7.8lb/hp
I have this. Its great.
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Old 09-25-2013, 06:37 AM   #18
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Originally Posted by alphaomega0 View Post
i see 550hp easy with this engine, even with 3500lbs with that kind of potential in power it should be a tire smoking hotness
Based on what info?
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Old 09-25-2013, 07:20 AM   #19
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ha ha traction limited - still nice tho
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Old 09-25-2013, 07:53 AM   #20
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Quote:
Originally Posted by SoapBox View Post
Based on what info?
based on the current generation of 335/135 potential, they pick up around 100hp with just a chip
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Old 09-25-2013, 08:27 AM   #21
SoapBox
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Quote:
Originally Posted by alphaomega0 View Post

based on the current generation of 335/135 potential, they pick up around 100hp with just a chip
I know, i have one. And its just the older n54 cars that can do that. The newer n55s cant.

Thats not evidence though. Im talking about turbo and injector size info that wouls lead you to believe this 3.0l tt will be able to put up another 100 hp on top of what looks to be a similar 3.0l tt made by the same company was able to achieve.

For all we know, in order to keep lag down, the turbos are closer to n54 size, and making an extra 100 hp wont be so easy.

Dont get me wrong, i hope youre right. But i think the n54 was an exception, not exactly the rule.

Last edited by SoapBox; 09-25-2013 at 08:32 AM.
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Old 09-25-2013, 09:26 AM   #22
SoapBox
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And +1 there's no way this thing has an actual curb weight of 3300. Not a chance in hell.
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Old 09-25-2013, 09:34 AM   #23
SoapBox
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Yeah, certainly not looking like you will be able to tack on another 100 HP with ease...

Quote:
The 3.0-liter inline-six will make slightly over 420 horsepower and "far beyond 369 lb-ft," BMW says. Our educated guess is that it will make around 390 lb-ft. The engine is boosted by two relatively small Mitsubishi turbochargers which provide up to 18.9 PSI. (BMW disingeniously sticks to the "Twin Power" designation, which signifies little. The same moniker is stuck to the single-turbo N55 engine.). There is an electromechanical wastegate and a large intercooler, which sits atop the engine - and which is the reason for the massive bulge on the M3/M4's aluminum hood.
Top mounted I/C, and the small snails are already at almost 19 PSI.

The 400 HP N54s are running significantly less boost than that.
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Old 09-25-2013, 09:46 AM   #24
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Can any of the guys with I6 turbo 1's or 3's comment on the sound of the car? Listening to some of the videos of it on the 'ring etc, that engine sounds big. Like a 3.6 or 3.8. Very Porsche-like. Does anyone concur?

I am also still a bit skeptical of the weight, but man, right out of the press release:

Quote:
The weight of the cars has been reduced to just under 1,500 kilograms, which helps to ensure outstanding driving dynamics and exceptional efficiency.
Hard to imagine, we'll see.

It feels like this car will be a killer, hopefully it still has M3 character. It will need it... this M3 will still be an underdog in terms of magazine-racer performance criteria.
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Old 09-25-2013, 09:52 AM   #25
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The weight is almost certainly incorrect. It doesn't specify what weight it is, such as curb weight etc. It also says 200 lbs off the previous one which will put it at ~3500.
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