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BMW M3 and M4 will rock 430 hp from twin-turbo six with standard manual [w/video]

We're not sure which spec we're most intrigued by for the new BMW M3 and M4: the twin-turbo six-cylinder with 430 horsepower and "far beyond" 369 pound-feet of torque, the 3,300-pound curb weight or the standard six-speed manual transmission with automatic throttle blipping on downshifts. That engine is fitted with both Valvetronic and Double-Vanos, twin-wire arc-spray coating in the cylinders instead of liners to save weight, a track-ready cooling system with additional radiators, a forged crankshaft, dry-sump lubrication and a magnesium oil sump. BMW says its "high revving concept" has a redline beyond 7,500 rpm.
In the M4, it will be pulling a coupe with "a weight of just under 1,500 kilograms," which is 3,300 pounds to you and me. That number is said to include no driver and 90 percent fuel, but we're still waiting on the exact number and specs. BMW says it's "around 80 kilograms lighter than a comparably equipped predecessor model," putting the power-to-weight ratio at something like 7.68 pounds per horsepower at the same time as it helps reduce fuel consumption by 25 percent. The use of carbon fiber reinforced plastics (CFRP) for the roof, drive shaft (with no center bearing), trunk and front strut brace, and forged aluminum for suspension components, have aided in the weight loss. This time around, the sedan - the M3 - will also get a CFRP roof.
The default option will be a six-speed manual.

BMW M4 Convertible spied with naked top and trunk

Our trusty spy photographers have been at it again, snagging these first images of the forthcoming BMW M4 Convertible without camouflage on its retractable roof and rear deck. You'll recall that this is not the first time we've seen the followup to the M3 Convertible, but that the last batch of images we had were encumbered by a lot more camouflage - this car is virtually naked by comparison.
Not surprisingly, the M4 looks to share its folding hardtop design with the standard 4 Series droptop, and it should operate in a similar manner as well. It's no surprise, but it looks like BMW is going to try and make the transition from M4 Coupe to M4 Convertible as effortless as previous efforts converting the M3 to an M3 Convertible. That should mean that below the beltline, this car is nearly identical to the coupe we saw in Detroit.
As for the camo'd features on these spy photos, the hood, front fascia, rear fascia, quarter panels, side sills and mirrors have all been shown on the M4 Coupe, and don't really bear mentioning. There's been no word of just where the M4 Convertible will make its debut, although considering the lack of disguise on this car, Geneva seems like a likely destination.

Autoblog Podcast #407

Episode #407 of the Autoblog Podcast is here, and this week, Dan Roth, Steven Ewing, and Sebastian Blanco talk about the Michelin Challenge Bibendum, the Toyota Mirai, and the BMW 3 Series falling off the Car and Driver 10Best list. We start with what's in the Autoblog Garage and finish up with some of your questions, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Check out the rundown below with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #407: The video meant to be presented here is no longer available. Sorry for the inconvenience. Topics: Challenge Bibendum Toyota Mirai fuel cell 3 Series falls off Car and Driver 10Best list In The Autoblog Garage: 2015 Acura TLX 2015 Dodge Charger 392 Audi Prologue Concept Hosts: Dan Roth, Steven Ewing, Sebastian Blanco Runtime: 01:07:55 Rundown: Intro and Garage - 00:00 Challenge Bibendum - 18:32 Toyota Mirai - 28:20 C/D 10Best - 44:52 Q&A - 53:52 Get the podcast: [UStream] Listen live on Mondays at 10 PM Eastern at UStream [iTunes] Subscribe to the Autoblog Podcast in iTunes [RSS] Add the Autoblog Podcast feed to your RSS aggregator [MP3] Download the MP3 directly Feedback: Email: Podcast at Autoblog dot com Review the show in iTunes Podcasts Acura Audi BMW Dodge Toyota toyota mirai challenge bibendum