For anyone reading this, I purchased the book and it is an excellent book. I highly recommend it. You also aren’t obligated to go from front to back as it lends itself to browsing back and forth as the ideas start flowing.

I have observed a 5-6% improvement in fuel economy from fitting a 65mm deep airdam to a mid 90s japanese hatchback with a rough under body / partial aero undertrays, in good agreement with the findings of "EFFECT OF UNDERBODY STRUCTURE ON AERODYNAMIC DRAG AND OPTIMIZATION (ZHIQUN YUAN, YIPING WANG)". I've got twice the money back in fuel savings that I spent on the air dam over 5,000km of highway driving.

When people say it's too hard, I think it's because they don't want to put in the work (i.e. testing and development). Most people are looking for "easy button" solutions.

Purchased the book. Been watching all your videos and I'm excited to learn

BTW, the book is 43% off at the Amazon US store right now, it's still full price in the EU (~106 Euro.) Wish it was like that when I bought the suspension book last week from the US!

One of the best books on cars that I have (and I have many). Really accessible and cheaper than shipping on bolt-on car parts.

I am seriously thinking about buying this book when i afford it, my concerns are, if i can actually manufacture mock ups and final parts that can be safely attached to my car. I hope the book, covers that part too, recommending materials, attaching methods and easy crafting techniques for amateurs with a limited amount of machinery/tools and hands on experience.

The thing I do not get is why does the government/ police are against "after market/ manufacturer" improvements? If you fit better shocks than stock it means your car will handle better which makes it safer for you and others trying to avoid danger and maintaining control. Fitting better breaks is self explanatory. If earo dynamic improve a lot of things like handling etc the wats with the hate? there has been issues with cars out of the factory where they have to do recalls to rectify the issue but aftermarket usually have solutions before manufacturers have them and most of the time the aftermarket has better solutions. Note that is if you buy from a certified manufacturer that has tested and passed the qountries standards and that is of good reputation and quality.

Very interesting! I'm gonna buy this book😄

I am interested in having a forward swept wing in cars instead of the normal rectangular wings but i would like to have it functional as well. Do you have any research papers that might help me with this?

Sadly, every added part without allowance from the german government is forbidden. That also counts undertray. No the less, just take it off bevor TÜV 😂

Is this book a continuation of your earlier book "Modifying the Aerodynamics of your Road Car", or would you consider it the replacement of that book?

I disagree. Sure adding a wing that produces downforce isn’t difficult. But it has to earn its keep against the additional drag, and that’s a difficult justification which depends on how many straights are on the course, how many high speed corners, how powerful car is. If you produce 100lb downforce thats at best multiplied by the tire coefficient of friction which I’ll assume is 1.3. So 130lb increase for lateral acceleration which is a really small percentage of total lateral force. But thats only at some speed maybe 70mph. So now at 70mph your suspension is settling at a different place than at 30mph and 100mph. So what speed should your suspension be set up for? Significant downforce demands suspension revision. Well set up aero cars tend to handle poorly when they’re off the wing. Wing weight is also typically going to increase polar moment. Have you verified the aero is working properly in pitch, dive, and roll? And lastly it’s ugly lol Of course I agree with underbody changes and closing panel gaps and such.