GM Engine Tuning and Examples

GM PCMs used in the early TPI systems were a simple MAF based, bank-to-bank system. Early LT1 systems were speed density with sequential control with knock control. The LT1, 3800 V-6, and LS1 are primarily MAF based, sequential injection with knock … [Click here to read more...]


The Rise of Drag Racing

Looking back on the glory days of drag racing, it’s easy to see where the hobby got its roots, even though modern-day drag racing is so far away from its earliest beginnings. These days, drag racing is a highbrow business, with big-money … [Click here to read more...]


Superharging to Increase Horsepower

Let’s focus on the word “supercharge” for a moment. In the context of this book, it means to fill the cylinder above and beyond the displacement that it ordinarily has. For instance, if a cylinder has a 50-ci displacement and, by one means or another … [Click here to read more...]


How to Build a Wiring Harness

This chapter covers the last major topic—harness basics. In addition, I’m going to present a number of examples that tie together what you’ve learned in the first eight chapters of the book. I chose examples that I feel most readers of this book will … [Click here to read more...]


Manual Transmission Shifter Basics

Today most manual-transmission cars are equipped with a floor shifter. In general, prior to World War II, most vehicles had a shifter mounted in the top cover of the transmission. The shifter directly moved the shift forks. Automotive engineers in … [Click here to read more...]


Abandoned Dragstrips: The Midwest

There are folks who say hot rodding originated on the West Coast, and while those folks have a good point, it doesn’t mean gearheads in other parts of the country didn’t have a few ideas of their own. Drag racing certainly had its hotspot in Southern … [Click here to read more...]


Automotive Engines: Flaw Detection

To achieve the highest level of precision engine building, you must perform diligent detective work and pay close attention to detail. When using flaw detection equipment, you are searching for damage that’s more and less apparent. And many kinds of … [Click here to read more...]


Exhaust System Performance Math

Choosing exhaust pipe diameter and header primary-tube diameter and length can be confusing. Generally, people tend to copy what others have done, often choosing too-large tube and pipe diameters with the belief that bigger is always better. Not so. … [Click here to read more...]


Automotive Speed Secrets

A bold chapter title to be sure but, before going into the fundamental principles of what makes horsepower, let us look at the definition of horsepower. This seems a necessary step because, too often, novice enthusiasts are unaware of how horsepower … [Click here to read more...]


How to Rebuild the Rear Axle

In recent years, rear axles have become so robust and reliable that most mechanics have long forgotten how to diagnose and repair them, much less modify them. The rear axle is one part of the vehicle that has evolved over time into a variety of … [Click here to read more...]


Engine Tuning: The Good Ol’ Days

Carburetion If you can tune a carburetor, you can tune EFI. Every single component of a carburetor has its counterpart in the tables of modern EFI systems. Many die-hard racers swear by their trusty old double pumpers and it’s tough to argue with … [Click here to read more...]


How to Blueprint Engine Blocks

To blueprint an engine block, you must accurize it. You must achieve the proper bore dimensions, but also must consider the total geometric state of the block and correct any deviations from ideal geometry. This means that you inspect and machine in … [Click here to read more...]


Engine Measuring EFI Inputs-Best

Before we delve into the tables that control engine operation, it is important to understand what the computer sees. The old saying, “garbage in, garbage out,” applies directly to EFI systems. More often than not, the cause for a poor-running car … [Click here to read more...]


Horsepower Secrets: Cylinder Heads

We have finally arrived at the socalled cork in the system, as far as power production is concerned. As Chart 6-1 shows, optimizing airflow (and that means getting as much as possible) is the number-one goal. But as far as heads are concerned, it is … [Click here to read more...]


Abandoned Dragstrips: East Coast

As we continue eastward on our trek to find the coolest abandoned drag strips in the country, the terrain becomes a little rougher, and it’s easy to see why it was more popular to build tracks out West. The hilly lands of Pennsylvania, and many of … [Click here to read more...]