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Honda also decided to do the chassis development in house. Originally Andretti-Green and Highcroft racing were going to use a Courage LC75 chassis, with Fernandez Racing running a Lola chassis using the Acura engine. Fernandez has run Lola all year, but early testing with the Courage showed that it wasn't up to snuff and they ended up completely re-engineering it to meet their needs.

A lot of computational fluid dynamics and fifty-percent-scale wind tunnel work resulted in a forty percent increase in the downforce of the Courage. Full scale testing improved that further. HPD ended up redesigning the suspension, chassis and body work to the point that by the time they got to Sebring this year, it had become the ARX-01 and was labeled as an Acura chassis.

The Highcroft team has focused on chassis development while the Fernandez squad with the proven Lola chassis has been the primary engine development team. Andretti-Green gets all the benefits of the other two. The result of all this work was that the Acura won the LMP2 class at the Sebring opener and has run competitively all year long.

For 2008, Acura is planning a major revision of the Acura chassis targeted at further performance improvements and more importantly the serviceability of the car. The current car is difficult to repair during a race and that needs to be improved, especially for longer races.

Over on the IRL side, Honda is currently the sole supplier of engines since Toyota and GM dropped out at the end of the 2005 season. One aspect of the lack of competition is that Honda doesn't have to stress their engines to the limit. In spite of the cars being as fast as ever, they haven't had a single in-race engine failure in 2007. The current engine is a 3.5L V-8 that runs on 100 percent ethanol.