Optimising Car Performance Modifications is a highly practical and useful book that covers brilliant techniques to the guesswork out of performance modification. Using just some low-cost tools, you can easily measure the flow restriction of your cars intake and exhaust. Its like having a huge flow-bench always available. By making some simple on-road measurements, you can plot the shape of the engines power and torque curves - no dyno needed. This allows you to not only see if performance modifications to the engine are improving power, but also see where in the rev range those changes are occurring. Assess the worth of cams, a larger turbo, changed boost control or altered engine management mapping. But the book doesnt stop there - it also shows you how to measure your cars aerodynamics, seeing if at speed your car is developing lift or downforce. Want to make a rear wing work well? Test the angle at which downforce is greatest. You can also test the aerodynamic airflow th