Thanks! I'm curious - did you just find the site on Google? Over the past two months I've re-mastered the old illustrations with a few filters and the difference is incredible. There's still a little more to do but I'm pleased you find it useful. The next step is to update the iOS app with new versions of the pics.
Here's a comparison of the pics:
Old - http://www.howacarworks.com/images/846/leaf-spring-suspensio... New - http://www.howacarworks.com/illustration/1333/leaf-spring-su...