Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

rusEFI: Open-source homebuilt fuel-injection set to rival Megasquirt

Electronic fuel-delivery and ignition controls have given us a new golden age of engine efficiency and performance. Most of us would never go back to the dark ages—say, before 1990—when you could still buy new vehicles with carburetors and clunky distributors. From the point of view of those of us who like to modify our cars, however, the black-box nature of engine-control computers limits our options for making changes to how our fuel-delivery and ignition systems function.

Audi RS7 Sportback (2013) first official pictures

This is the new Audi RS7 Sportback, just unveiled at the 2013 Detroit auto show. It's an A7 Sportback given the hardcore RS treatment, meaning a 552bhp and 516lb ft 4.0-litre bi-turbo V8 that will sprint the RS7 to 62mph in 3.9sec. That's faster than the latest Porsche 911 – it seems life just got a bit harder for the Mercedes CLS63 AMG and BMW M6 Gran Coupe.

Opel rolls out new cars at Frankfurt motor show

While some automakers had just one or two new cars to show off at the Frankfurt motor show, GM's Opel division flooded the show with seven new offerings that'll be revealed as the show progresses. While there were plenty of new production models to be seen, including the revised Opel Insignia lineup, it was perhaps the Opel Monza concept that was designed to grab the attention of showgoers. We got a sneak peek at the Opel Monza concept a couple months ago, and even though a production version is not planned, the Monza is meant to showcase Opel's recent resurgence.