Car Manufacturers Racing Websites and information.

Ford - They have an official website for their racing activities
Ford Racing - Ford Racing Performance Parts - Ford Performance Group

Suzuki: Official motorsports website
Motorsport | Global Suzuki

Honda: Official motorsports website
Honda Performance Development - Performance Engine Design for Honda Racing

Toyota: Official motorsports website
Toyota Motorsports

Volkswagen: Volkswagen Racing UK official site.
Volkswagen Motorsport
They are into racing big time

Renault: Official motorsports website
http://www.renault-sport.com/en/

Toyota Motorsport GmbH
Toyota Motorsport GmbH - Wikipedia, the free encyclopedia

These guys were doing great in WRC until 1999, and then no results for the next two years. This was to allow for their switch into F1. F1 as we all know, Toyota never went anywhere. With all the money they had, they could not get any results and they quit F1 in 2009. Now, Toyota is making money lending its Wind tunnel facilities, and their cars for tyre testing. No racing for the last few years.


Honda-
Honda was the powerhouse in F1 in the 60s, 1964-68, and were engine suppliers from 1983. Their next stint was BAR-HONDA which again went nowhere. I remember BAR-HONDA was singly responsible for the downfall of the 1997 world champion Vilenueve. Honda too quit F1 in 2009. They made a small stint into WRC in 2006 but that did not last long either. Honda now, with its financial position is not involved in any big sport. They are losing ground and fast. Other car companies are matching them on the engine aspect as well. [Honda was head and shoulders above the rest in the past in the engine department]


Hyundai-
Google says:
No search results found for 'Hyundai' + 'racing'
No obvious motorsorts involvement (they had tried their hand at WRC a decabe back with the accent I guess)

VW-
VW dominated the Paris-Dakar rally in 2010. The Tuareg finished 1-2-3. They organize the VW cup in the UK. The same was held in India as well which was called the Polo cup. (Racing against their own cars? Eeeeeks). They are into Formula 3.