Présentation V8-M3

Posté(e) le 23 mars 200718 a

comment_128264

Quelques données techniques:

new m3 engine-1.pdf

Posté(e) le 23 mars 200718 a

comment_128265

Bon a savoir!!!

Merci Dr.No.

Posté(e) le 23 mars 200718 a

comment_128281

40mkg de couple pour 4l de cylindrée, c'est moins bon que les 36.5 mkg pour 3.2l de cylindrée de nos M3.

Idem le rapport puissance au litre passe de 107 à 105 mais bon j'imagine que ça doit quand même bien dépoter parce que le son d'un V8 bien grave

A voir les premiers tests et merci pour la doc!!!

Posté(e) le 23 mars 200718 a

comment_128284

Je crois que plus on monte en cylindrée et plus il est difficile de sortir un bon rendement en restant fiable.

C'est la raison pour laquelle par exemple la nouvelle GT3 reste un 3.6 et pas un 3.8 comme la plupart des autres 911.

Posté(e) le 23 mars 200718 a

comment_128289

Je crois que plus on monte en cylindrée et plus il est difficile de sortir un bon rendement en restant fiable.

C'est la raison pour laquelle par exemple la nouvelle GT3 reste un 3.6 et pas un 3.8 comme la plupart des autres 911.

Oui trés vrai ça.

De plus la nouvelle passe en "turbo" non?

Donc cela va facilter le rapport cheveaux/litre.

La GT3 est toujours atmo.

On le vois avec les nippones qui ont des rendement de fou,grace a l'ajout de turbo ou autre compresseur.

La nouvelle ///M rentre dans une nouvelle aire et abandonne l'atmosphérique.

C'est ça ou je confond avec la 335i? Je ne sais plus la.

La ///M va être en V8 Bi-Turbo c'est ça?

Je vais me documenter pour ne pas dire de connerie.

Posté(e) le 23 mars 200718 a

comment_128292

Non je crois que tu confond avec la 335 I

Et je vois que le rupteur est à 8 300 tr/min, sur la E46 il est pas à 8 500 ?

Posté(e) le 23 mars 200718 a

comment_128293

Non elle reste bien en atmo si j'ai bien tout compris.

Posté(e) le 23 mars 200718 a

comment_128294

Non elle reste bien en atmo si j'ai bien tout compris.

Oui autant pour moi,j'ai confondu avec ce nouveau double Vanos.

Et c'est tant mieux quelle reste atmo.

Merci.

Posté(e) le 23 mars 200718 a

comment_128297

2008 BMW M3 Concept - Official Photos & Info - Auto Shows

Engine specs announced: 414 horsepower and a screaming 8300-rpm redline for the M3's first-ever V-8.

BY MIKE DUSHANE, March 2007

The BMW M3 has been on car nuts’ short wish list since the first-generation M3 debuted in 1988. Over the course of three generations, the M3 grew from that four-cylinder glorified go-kart into a stunningly capable GT car. But the formula remained constant: Combine the relatively small, compact 3-series body with a race-derived engine and maintain class-leading handling. The fourth-generation M3, which debuted at the 2007 Geneva auto show, doesn’t stray from the proven formula.

Unlike the second- and third-generation M3s, which had inline-sixes, the 2008 BMW M3 will have a high-revving, naturally aspirated V-8. The 4.0-liter engine (3999cc) is based on the 5.0-liter V-10 from the current M5, but minus two cylinders (and the corresponding liter of displacement). With double-VANOS variable valve timing, an individual throttle body for each cylinder, a 12.0:1 compression ratio, and a shrieking 8300-rpm redline, the all-aluminum engine produces 414 hp at 8300 rpm and 295 pound-feet of torque at 3900 rpm. Thanks to its lightweight construction, the V-8 will weigh in at just 445 lbs, actually 33 lbs less than the iron-block six of the previous generation. With various other weight-saving measures being employed, the 2008 car may end up weighing less than the outgoing car—figure around 3400 pounds. To the relief of enthusiasts everywhere, a conventional six-speed manual transmission will be standard. A seven-speed sequential manual likely will be offered later for video-game junkies and other masochists. The M3’s V-8 will produce five fewer pound-feet of torque than the turbocharged inline-six in the 335i, but it will be fully a third more powerful. We’ve posted 4.8-to-4.9-second 0-to-60-mph times in the 335i, and we expect the M3 to do that sprint in well under 4.5 seconds. Top speed, as with most performance BMWs, will be limited to 155 mph.

2007 Geneva Auto Show Coverage

The car debuting at the Geneva auto show is a so-called concept, but the only thing conceptual about it is the color, a brilliant metallic silver BMW calls Chrome Shadow. Other styling elements seen here will carry over unchanged to the production 2008 M3. Fans of BMW Ms could have predicted the aggressive front and rear styling, the centrally mounted quad exhausts, the 19-inch wheels, the flared fenders, the subtle rear spoiler, and the oval mirrors. But this M3 has a few surprises. A carbon-fiber roof (like the far costlier BMW M6’s) saves weight and lowers the center of gravity, and it also looks amazing devoid of paint. This black roof will make the M3 immediately recognizable as something special—particularly when the rest of the car is painted a light color. The M3’s aluminum hood, apparently taking a page from the Ford Mustang playbook, sports a power dome and air intakes. BMW’s M division was one of the leaders of the current fender-vent fad that by now has trickled down to the Ford Focus, so the company had to do something cool to stay ahead of the pack. The M3 sports ultra-modern fish-gill fender vents bisected by a chrome strip of LEDs. The contrasting roof, the perforated hood, and the swoopy fenders combine for a look that’s over the top yet contemporary—call it nouveau bling. The handsome 3-series coupe, on which the M3 is based, contributes only its doors and trunk to the M3’s bodywork.

The 2008 BMW M3 will compete with the new Audi S5 coupe when both go on sale in the U.S. in less than a year. The M3’s extra 64 horsepower, rear-wheel drive, and lighter weight promise to deliver a more raw experience than that of the all-wheel-drive Audi, but we expect the M3 will cost thousands more.

The two-door seen here will be the first M3 to appear in showrooms, and the price is likely to be about $55,000. Later, look for a convertible with a carbon-fiber retractable hardtop, a sedan, a wagon, and a lightweight coupe. The latter two probably won’t be sold in the U.S., but we haven’t given up hope yet. Whatever the body style, we’re dying to get our hands on one.

Posté(e) le 28 mars 200718 a

comment_128762

Quelques photos du moteur qui si je ne me trompe fait 4 litres de cylindré et developpe 420 chevaux (309 kW) avec un régime maximal de 8300 tr/min et un couple maximal de 400 Nm à 3900 tr/min.