A Turbo Single-Rotor Miata Looks Like The Most Fun An NA Can Get
The Mazda Miata is beloved for being tiny and light, a combination of qualities most modern automakers seem to avoid like the plague. It's never been the fastest car, but who really needs that? It's more of a slow-car-fast deal, and every method of upping the power always seems to add weight in equal measure. Unless, apparently, you're rotary wizard Rob Dahm: then you can slap a turbocharged single-rotor Wankel in there, and add power while actually cutting weight.
Dahm's latest project is to swap an NA Miata's four-cylinder out for a compact rotary engine. But unlike other rotary swaps, that usually use a 13b dual-rotor out of an RX-7, Dahm is using just a single rotor for his Miata. This comes with its own challenges around simply putting the engine together, but it also ends up with an engine block that weighs just 64 pounds, or less than half the shortblock weight of the engine it's replacing. Yet Dahm claims, with a properly-sized turbocharger, this build could double the Miata's factory horsepower.
Read more: Subaru Had It Right All Along
This video is just the first in the build series, but it's already more progress than many ambitious swaps ever make. The Miata's transmission has been cut up and welded to a rotary bellhousing, and the single rotor mill is physically inside the car's body. Surely not for the final time, as it's missing little niceties like "engine mounts," but it's in there all the same. The rest is just wiring and pipes, and that's easy, right?
If Dahm is correct about the eventual power and weight of this engine, he could have a truly incredible Miata on his hands by the end of the build. It would be more powerful than any Miata built by Mazda, but still light enough to sit with the stock cars, and not so overwhelmingly powerful to entirely change the beloved driving dynamics of the NA. We'll have to keep our eyes peeled on the build to see how it pans out.
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Yahoo
3 hours ago
- Yahoo
In distracting times, rumble strips are saving lives — and money — on rural Maine roads
The honeymoon was almost over for Steven Lavrenz and Sandhya Madan. After sightseeing in Acadia National Park, the newlyweds from Michigan woke early and started a long drive back to Boston Logan International Airport on the gray morning of June 3, 2019. But they wouldn't get very far before their trip — and their lives — were nearly upended. Heading north on Route 102, Lavrenz noticed a red pickup truck on the other side of the thoroughfare veering toward his Subaru rental car. Growing up in Iowa, Lavrenz had always held his breath on these kinds of two-lane rural roads, keeping one eye on oncoming traffic to ensure passing cars stayed in their lane. So when the Nissan crossed the centerline, Lavrenz was quick to react, swerving away from the approaching vehicle. The maneuver may have saved his life: The truck crashed into the door just behind Lavrenz, totaling the car but leaving him physically unscathed. Madan and the truck's driver also escaped the incident without injury, which is fortunate after what transit experts call a 'lane-departure crash.' While representing just 30 percent of Maine's traffic collisions between 2010 and 2022, lane-departure crashes accounted for 73 percent of fatalities. These head-on and sideswipe collisions are especially deadly in Maine, where researchers say that extreme weather, an aging population and infrastructure and a preponderance of winding, two-lane rural roads contribute to the highest crash fatality rate of any state in New England. Though Lavrenz was physically unharmed, the crash rattled him for a different reason than most. As a transportation safety researcher, he'd spent years thinking about lane-departure crashes and trying to prevent them from happening. But it was the first time the Wayne State University professor had ever personally faced the life-or-death consequences of his profession. Lavrenz had once worked with the Federal Highway Administration to add rumble strips to rural roads. Transportation departments around the country have gradually installed these grooved lines to jolt drivers who are asleep or distracted, the most common causes of lane-departure crashes. The strips vibrate the vehicle when it passes over the centerline or into the shoulder. Yet there were no rumble strips on this stretch of Route 102 that could have stirred the distracted truck driver, Lavrenz observed after their destroyed Subaru sputtered to a stop next to a Maine Department of Transportation facility. The next morning, after they secured another rental car and caught their flight, he decided to tweet at the agency. 'Centerline rumble strips could've prevented this,' he wrote, linking to a dashcam video of his crash. Research from a bevy of states backed his assertion at the time. But a new study led by civil engineers at the University of Maine provides the most relevant data yet for the effectiveness — and cost-effectiveness — of centerline rumble strips on Maine's sprawling network of rural roads, many of which remain without these life-saving grooves. In a before-and-after analysis, the researchers found that installing centerline rumble strips on rural two-lane roads reduced head-on and opposite sideswipe collisions by anywhere from 28 to 48 percent. By limiting these dangerous crashes, the state saves not only lives but money, according to the authors, who estimated that 'the benefits of the rumble strip installations are at least 14 times the cost.' 'They're one of our most cost-effective safety countermeasures that we can deploy out there — and also one of the most effective,' said Bob Skehan, the director of MaineDOT's Office of Safety and Mobility. Jhan Kevin Gil-Marin, one of the study's co-authors, started working on the paper as a master's student in civil engineering at the University of Maine. With guidance from Ali Shirazi, who was then the principal investigator of the Maine Transport Lab based at the school, Gil-Marin used data from MaineDOT to compare crashes on similar roads with and without rumble strips. Unlike some past analyses in Maine and elsewhere, however, the study examined before-and-after crash data on roads specifically with centerline rumble strips. And it used these figures to model how many crashes would ensue if the grooves had never been installed on them, allowing the researchers to better determine the safety measure's true effectiveness. It also enabled them to perform a cost-benefit analysis, calculating this number based on MaineDOT's reported installation cost ($3,500 per mile, according to the study, though Skehan said it can now be higher) and the Federal Highway Administration's assigned costs for different types of crashes. Even using a very conservative service life for rumble strips of seven years, the study showed the strips pay for themselves and then some. 'I think rumble strips are a very good idea,' said Gil-Marin, who's now pursuing his PhD at Rensselaer Polytechnic Institute. Before uprooting to Maine from Colombia to work with Shirazi, Gil-Marin had never seen rumble strips. On a quiet road, he guided his car over the grooves and felt the vibration for the first time. It wasn't long ago that many Mainers may have had the same experience. Getting ready to rumble When Per Gårder arrived in Maine in 1992, there were no rumble strips in the state. During the Swedish engineer's interview for a position at the University of Maine, however, he met John Alexander, a fellow engineer who'd taken a personal interest in the safety measure. A neighbor of Alexander's had died after driving off the interstate and hitting a tree. 'He started talking to me about installing rumble strips by driving a bulldozer down the highway and roughing up the shoulder so that people would wake up before they go off the road,' recalled Gårder, a professor emeritus of civil and environmental engineering and co-author of the new study. Road safety was personal for Gårder, too. As a kid, he recalls one trip when his sleepy father ceded the wheel to his mother late at night. When Gårder woke up, they were in a ditch — his mother had dozed off. 'We didn't hurt ourselves, but that was probably the first time I started thinking there should be waking you up when you are drifting to sleep, and that it actually could happen to everybody,' Gårder said. After Gårder joined the faculty, he made shoulder rumble strips a focus of his research. There were few studying it at the time. In the U.S., 'singing shoulders' debuted on the Garden State Parkway in New Jersey during the 1950s, but they were rarely seen elsewhere for decades. MaineDOT and the Maine Turnpike Association didn't start installing rumble strips along the edges of Interstate 95 in Maine until 1994. In his early years at the school, Gårder photocopied and analyzed police reports of fatal crashes on Maine's interstates between 1989 and 1993, which revealed that nearly half of them involved drivers falling asleep. Yet, after the installation of hundreds of miles of continuous shoulder rumble strips along Maine's interstates, driver drowsiness was no longer as deadly; an analysis co-authored by Gårder in 2006 showed that the safety measure had reduced sleep-induced 'run-off-road' crashes by 58 percent. That same year, MaineDOT began installing rumble strips on the centerline of state roads. While the addition of the safety measure to the shoulders of interstates had helped prevent drivers from veering off the interstate, implementing rumble strips in the middle of rural thoroughfares could reduce the often lethal head-on collisions between cars in opposite lanes. 'When you have two vehicles traveling at 50 miles an hour that hit head on, essentially, it's the same as being in a 100 mile an hour crash and hitting a fixed object, like a tree, if you went off the side of the road,' Skehan said. 'So they're definitely our biggest risk from a safety perspective.' Initially, the agency targeted corridors with a speed limit of at least 45 miles per hour and a traffic volume of more than 8,000 vehicles per day to add rumble strips. The pilot produced excellent results: the new rumble strips on these roads cut head-on crashes in half and eliminated fatal collisions entirely during an initial period, Skehan recalled. That level of effectiveness wouldn't quite hold up over the long term. And as MaineDOT installed more rumble strips in areas where head-on crashes were common, there were still some deadly collisions even after the safety measure was implemented. But time after time, the little grooves significantly reduced crashes and fatalities. 'It's still, by far, our biggest lifesaver with regards to two-lane, rural, head-on collisions,' Skehan said. He pointed to a 20-mile stretch of Route 202 between Lewiston and Manchester where head-on and sideswipe collisions dropped precipitously in the three years after the installation of centerline rumble strips about a decade ago. 'It was pretty remarkable,' he said. Still, part of what made rumble strips so effective also disturbed more than a few neighbors when they were first installed on rural roads. 'There were some noise concerns,' Skehan said. After MaineDOT added rumble strips to Route 302 in Bridgton, neighbor Bill Muir compared their clamor to a tractor trailer 'going down a steep grade and shifting into low gear.' 'I know from personal experience that it could be heard inside our home quite clearly even with all windows closed,' Muir wrote to The Bridgton News in February of 2017. The next year, MaineDOT began exclusively using sinusoidal rumble strips, colloquially known as 'mumble strips.' When they're driven over, the quieter, shallower alternatives to rectangular rumble strips create slightly less sound inside the car but drastically decrease the noise outside of the vehicle, according to Skehan. 'That has pretty much eliminated all noise calls that I've received.' Looking down the road Rumble strips now line the edges of all interstate highways in Maine. But centerline grooves remain absent from most roads in rural areas, particularly in the northern part of the state. MaineDOT aims to add about 100 miles of rumble strips to state roads every year, according to Skehan. The agency prioritizes areas with high traffic and fresh pavement to maximize the service life of the grooves. MaineDOT allocated about $750,000 for these projects annually, per Skehan, with about 90 percent of this funding coming from the federal Highway Safety Improvement Program funding, and the remainder from the state. Route 102 doesn't have rumble strips yet. It's a candidate to receive them, according to Skehan, but the area where a truck crashed into Lavrenz and Madan's rental car is less of a priority than other corridors. The state also doesn't manage town and city roads that thread through communities. Bar Harbor police chief David Kerns doesn't see much of a need for rumble strips on these generally lower-speed roads. 'Really, those in-town streets are so narrow anyway, people tend to go center of the road more to get away from parked cars and open doors,' Kerns said. Still, he's noticed a rise in collisions he attributes to the distraction of cell phones and displays in cars. The town of Bar Harbor received a federal grant to make its streets safer after five fatal and 17 incapacitating crashes between 2019 and 2023. Additional signage and collapsible line delineators are among the interventions under consideration. At the same time, Kerns recognizes that technology can also be part of the solution. Some cars are now built with sensors to detect when the vehicle has left its lane. And though Gårder doesn't advocate checking your phone while driving, he stresses glancing at displays every once in a while to stave off sleep, which is still a common cause of crashes. 'Like in an airplane, pilots are supposed to have certain tasks every now and then,' he said. 'They are not supposed to be completely inactive.' For Lavrenz, it's simple: 'Human drivers are always going to make a mistake.' And instead of waiting for crashes like his to happen, transportation departments can address the problem proactively by deploying low-cost safety measures like rumble strips across many miles. 'Let's go out and try to treat a broad swath of these two-lane rural roads because we know that they're a major risk factor,' he said, 'and hopefully prevent a lot of these crashes from happening in the first place.'
Miami Herald
10 hours ago
- Miami Herald
Subaru Just Dropped a Teaser for a Sporty New Model – Could it Be the STI Successor?
Subaru's iconic rally-derived sport sedan, the WRX STI, has been absent from the market since 2021. Although its slightly less potent sibling, the WRX, is still available for purchase from your local Subaru dealer, Subaru loyalists have long been awaiting any sort of news about an upcoming replacement for the hotter, Subaru Technica International-developed model. That lengthy wait may almost be over, according to Motor1, which reports that, "During a media session surrounding the Super Taikyu series at Fuji Speedway, Subaru Executive Managing Director and Chief Technical Officer, Tetsuro Fujinuki, confirmed a new performance model for this year's Japan Mobility Show." Although no official details have been announced yet, we can expect to learn more come October when the 2025 Japan Mobility Show begins. For the time being, however, we're left wondering what exactly Subaru might have up its sleeve. When looking at Subaru's teaser image, it seems pretty clear that whatever Subaru is planning on unveiling in November, it'll be heavily based on the current VB-generation WRX, as made evident by its distinct forward fascia, C-shaped LED headlights, and, of course, its signature hood scoop. Notable differences that set this teaser apart from the standard WRX are its aggressive front bumper splitter, its widened wheel arches, and perhaps most curiously, the blurred rear end. What's most intriguing about the rear of the car's roof is the obvious tailgate hinges, which might suggest that a hatchback variant of the Subaru WRX STI might return after a long hiatus–something that many Subaru and hot hatch fans alike will be extremely excited about. Despite the hatchback hints, the image also seems to suggest a large spoiler could be present on the rear. Keep in mind that this is pure speculation, but it seems like the details on the rear of the vehicle in the image might suggest that both four-door sedan and five-door hatchback variants of the WRX STI could be made available. Only time will tell, but we remain extremely hopeful that the beloved WRX STI Hatchback makes a glorious return. Using generative text-to-image artificial intelligence and Adobe Photoshop, we imagine what a tarted-up, STI-branded variant of the VB-generation Subaru WRX could look like. Although the render pictured above depicts a two-door coupe body reminiscent of the iconic Subaru Impreza 22B STI, an actual WRX STI would likely retain all four of its doors, or perhaps gain a fifth door in hatchback guise. Despite its coupe appearance, the above render gives us a glimpse at possible styling alterations for the STI model, such as facelifted headlights for a more aggressive look, larger grilles for increased cooling airflow, wider wheel arches with contrast painted overfenders, and, of course, an extra aggressive rear spoiler for enhanced aerodynamics. Although not many details have been officially confirmed yet, we're eagerly awaiting more information to be revealed in October of this year. We'd love to see a hatchback return to Subaru's iconic WRX lineup, so hopefully the tailgate hinges on the teaser image turning out to be a clue and not just meaningless speculation. Regardless, we're glad to see Subaru working on something sporty and exciting rather than yet another crossover. Now, if only Mitsubishi would get the hint... Copyright 2025 The Arena Group, Inc. All Rights Reserved.
Yahoo
20 hours ago
- Yahoo
How A Shop In The UK Beat The Nürburgring's Van Lap Record In A Diesel Volkswagen
None of Jalopnik's full-time staffers have kids, and yet, we're still about as pro-van as a transportation site gets. I mean, what can I say? They're just so darn practical. Maybe you don't put much stock in Nurburgring lap times, but van lap times? Now that's some Very Important News. For the last several years, the record to beat was Guy Martin's time of 9:28 in a 700-horsepower Ford Transit Super Van. Now, that record has been beaten, too, and Road & Track recently talked with Dan Silvester, the guy who recently lapped the 'Ring in 8:27. In a diesel Volkswagen van. As you can imagine, Silvester's Volkswagen Caddy is a far cry from the stock Ford Transit that Sabine Schmitz set a time of 10:12 on "Top Gear" back in 2005. Still, it isn't quite as powerful as you might assume. There's no electric powertrain yanked out of a wrecked Tesla or supercharged V8. Instead, it's just a 2.0-liter four-cylinder diesel engine that makes 356 hp and 470 pound-feet of torque. The modifications required to turn it into a Nürburgring record-holder came from Darkside Developments, a British tuning shop that specializes in diesels. As Road & Track put it: At a glance, the Volkswagen Caddy is a utilitarian work van, but Darkside Developments's expertise turned the part-VW Touran, part-VW Golf machine into a proper track car. Upgrades range from a Wavetrac limited-slip differential up front and KW Clubsport suspension all around to a 4Motion AWD conversion kit from an Audi, Porsche Cayenne brakes, and the requisite bits of interior racing kit. In other words, it's a shell of its former self, much like the Ford Transit that Martin took into battle back in 2021. Read more: These Supercars Lose Value So Quickly, They're Almost A Steal According to Silvester, part of the reason you don't see more extensive aero mods on the outside of the van has less to do with keeping it anonymous and more to do with achieving a higher top speed. As he told Road & Track: I don't know if it's just the shape of the van itself because it had plenty of power, and, if you put that power plant in a Golf, it'll probably do 160 mph. But the van just really didn't want to go much more. I think we got up to 140 mph on the back straight. We had no aero on the van at all either. We didn't put any splitter or a spoiler on it because we thought we wanted to use all the power we've got without causing too much drag, and we didn't want to ruin the profile of the van and keep it looking like a van. Despite not being able to hit the top speed they may have liked, they still smashed Guy Martin's time by a full minute. That said, it doesn't technically count as a new official lap record because it was set on a public track day, and the lap time wasn't officially confirmed. They may have used a VBox system to time the lap, so there's no reason to believe Silvester didn't lap the 'Ring as quickly as he claims, but still. You have to jump through all the necessary hoops if your want your Nurburgring van lap record to be officially official. It's also a fascinating interview, so be sure to head over to Road & Track to read the whole thing. Or just give them a click so Hearst knows you want to see more van content. Because, in a world full of SUVs, the car world deserves more van content. If you want more details on the build, you can also take a look at that here. Want more like this? Join the Jalopnik newsletter to get the latest auto news sent straight to your inbox... Read the original article on Jalopnik.
