CC Quickies Here's what happens when an incompressible liquid finds its way into the cylinder on a 5.3L LS engine. Amazingly, the rod bent in two different planes and yet didn't crack the cast piston. We're not sure if that's a good thing or a bad thing. One thing for sure, the rod is malleable. CC Quickies Here's what happens when an incompressible liquid finds its way into the cyl Here's where it gets tricky. The GM TBI is a speed-density system, which assumes the engine ingests a given amount of air at wide-open throttle (WOT). Mass airflow systems measure the air entering the engine, but speed density systems like those used on these TBI engines do not. Instead, they assume a stock airflow value based on throttle position and manifold absolute pressure (MAP) sensor readings. The fuel requirements at part- and full-throttle are established by the factory based on the engine's air and fuel demands. Increasing airflow with a better intake, heads, camshaft, and/or exhaust increases the airflow through the engine and demands a change to the stock computer base fuel and spark maps. These TBI injection systems are controlled by GM computers equipped with chips that are burned or electronically imprinted with the necessary information. Later GM computers use erasable EE-PROMS that can easily be reprogrammed while still in the vehicle. However, the chips in the TBI trucks and cars have to be removed and a new chip is burned with the new information. This can get time consuming and pricey if you have to make multiple changes to improve driveability. If you plan to do this, call one of the companies such as JET or CFM Technologies to find out about a complete package it offers. These companies can supply the parts and a compatible chip as a package that has a much better chance to be correct on the first try. These systems cost a little more than what you could put together on your own, but that's because you're paying for their experience and tuning expertise. Trust us, it's worth the investment. More Info Airaid Filters Phoenix, AZ 888/876-8984 airaid.com CFM Technologies Moultonboro, NH 603/238-6721 cfm-tech.com Edelbrock Torrance, CA 310/781-2222 edelbrock.com Hypertech Barlett, TN 901/382-8888 hypertech-inc.com JET Performance Products Huntington Beach, CA 800/535-1161 jetchip.com Scoggin-Dickey Parts Center Lubbock, TX 800/456-0211 sdparts.com Summit Racing Akron, OH 800/230-3030 summitracing.com Trans-Dapt Whittier, CA 562/921-0404 tdperformance.com Turbo City Orange, CA 714/639-4933 turbocity.com « | 1 | 2 | 3 | 4 | 5 | 6 | » | View Full Article Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!