ENGINE PERFORMANCE – TECH TIPS DYNAMOMETER TESTING AND FORD RACING CALIBRATIONS (continued...) Similar misleading results can be caused by a failure to keep inlet air temperature constant between runs. The PCM will retard spark timing to prevent detonation as inlet air temperature increases, lowering power output. On a forced-induction car, the inlet air temperature is generally measured after the power adder (and after the intercooler, if applicable) and can be MUCH greater than ambient temperature. Careful monitoring of A/F ratio and inlet air temperature are critical to making accurate conclusions regarding the effectiveness of various high-performance parts. Secondary factors that also affect measured wheel horsepower are engine oil temperature, differential oil temperature, humidity, etc. It simply cannot be overstated that all conditions need to be as similar as possible between dyno runs in order to have a meaningful scientific conclusion, which requires the supporting data previously discussed. FORD RACING CALIBRATIONS The calibrations that Ford Racing provides for our cold air and supercharger kits are done by Ford engineers who, in many cases, worked on the actual production vehicles. No one is more familiar with Ford engines and Ford control systems than Ford engineers. Extreme care is taken to provide as much power and torque as can be safely delivered, but also to deliver extremely high durability and exceptional drivability. Most of our kits are also 50-States Emissions Legal and many are now even offered with a warranty when dealer installed. Most aftermarket tuners other than Ford Racing do a few “tricks” that we do NOT recommend, such as: •Turning off the inferred catalyst, oxygen sensor and exhaust valve temperature protection logic discussed in the previous section. This prevents the PCM from richening the A/F ratio to protect these components which can result in more power under certain conditions. The downside isdrastically decreased durability of these expensive components, which can result in the “check engine light” coming on, as well as increased exhaust emissions due to failed catalytic converters. Ford Racing does not compromise durability or emissions by turning off this calibration logic. • They often advance spark timing to potentially unsafe levels. We test our calibrations in a wind tunnel and in hot, dry weather to verify that potentially damaging spark knock or catastrophic pre-ignition does not occur. We also do cold weather and altitude testing as well as extensive emissions and durability testing on several vehicles before we release a calibration to the customer. Most other companies do not have the time or the resources to do the same type of testing that we do. Some companies do not realize that they need to perform this type of testing in the first place! For important information about the proper usage of performance parts, please see page 14. 152 Techline (800) FORD788 See pages 286-292 for important safety, emissions and warranty information.
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