I agree that the "off the shelf" chips like Superchip and Hypertech will typically only give you a 4-5hp gain at the wheels. These companies simply use the computer code from your EEC to make a "general" program. The best chips to get are programmable ones like Autologic. They can hold 4 separate programs. They can be custom made during dyno-tuning sessions. On-the-spot changes can be quickly made. An experienced shop usually has a Dyno-Jet, wide-band O2 sensor, and Autologic software. I personally recommend Johnson Motorsports
www.jmschip.com After doing some mods to my '95 5.0 Mustang, I encountered some drivablity problems. After a couple of dyno pulls with the wide-band O2 sensor hooked up, we discovered that my new Pro-M mass air meter was leaning out my A/F ratio. A few more pulls and a couple of gradual changes to the total timing and A/F tables in the chip, and we found the "sweet spot" my car needed. When all was said and done, I gained 13rwhp and 10ftlbs torque. Because of my underdrive pullies, we set the idle speed at 900rpm for a full charge at idle. When I got the Vortech installed, we dyno-tuned it with same chip. The drivablity issues are gone. It now has docile street manners with an explosive rush of full-on power.
I was pleased with the results of the JMS chip and Chris Johnson's tuning knowledge. I plan to get another Autologic chip dyno-tuned for my '98 Contour SVT. I will post the results when it's done.
