TNT Performance Dyno
Motorcycle Tuning, Service & Performance Parts Center
219-B Shady Grove Road  Nashville, TN 37214
(615) 874-1005

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TNT Performance Dyno's Power Commander Tech Page

The Power Commander is a fully adjustable device, but don't confuse it (or any other fuel-adjustment device) with a magic wand. It is not self-learning and will not self-edjust to make your bike run perfectly. The Dynojet maps available for download are a great step in the right direction and are often close enough to satisfy riders. But if you are not quite satisfied with your bike's performance, there are some additional measures to help you reach performance nirvana. General Info PCIIIUSB  Throttle Position Sensor Adjustments  Oxygen Sensor Eliminator

General Information about your Dynojet Power Commander   This item alters the performance and characteristics of your engine and is intended for race use on closed tracks only. (EX Models are CARB Approved for Street use) The Dynojet Power Commander III USB allows fine-tuning of your fuel-injected motorcycle when changing air cleaner, pipes, cams, or making other performance adjustments. These adjustments can be made at throttle positions from idle to 100% and at engine speed (RPM) increments of 250. What this translates into is several hundred individual fuel cells which can be adjusted to richer or leaner conditions. Here at TNT Performance Dyno we specialize in fuel-injection mapping. If you want the best performance from your bike, then call us at 1-877-271-3966 and schedule your appointment for a custom map. With our secret weapon (aka "Konrad") and exhaust analyzer we can precisely adjust your bike to achieve the ideal air / fuel ratio, resulting in optimum performance. Just this week riders have traveled to TNT from Louisiana and Michigan because they recognized the role of proper mapping when pulling it all together. If your modifications are in progress or a trip to Nashville isn't on your list, we'll ship you a Power Commander pre-loaded with a map developed by Dynojet Research. If Dynojet offers a map which matches or closely matches your bike and its unique modifications, we will download that map into your Power Commander (no charge!) If a map matching your modifications has not yet been made by Dynojet, then your Power Commander will come with a map designed to improve performance over stock. We always recommend a test with a reputable Power Commander Tuning Center to ensure proper air/fuel ratio. Each Power Commander Kit includes the fuel adjustment module (fuel & ignition modules are included on many H-D models), software and USB cables for downloading maps, and a 9 volt power adapter. Dynojet is continuously mapping different combinations for each bike.    If you do not have a computer, you can change the settings with three touch buttons on the faceplate. We at TNT Performance Dyno generally discourage our customers from making adjustments with these buttons as there is no way to know the effect of the adjustments without running a dyno test. We recommend custom adjustments be made at authorized Power Commander Tuning Centers, such as TNT Performance Dyno.  No wiring modifications are required; OEM style connectors are supplied  Includes instructions with helpful pictures

Throttle Position Sensor Adjustments Because there are variances in throttle position sensor (TPS) installations from the motorcycle factories, you may need to adjust the Power Commander's TPS values to match your individual motorcycle's settings. This way, when your bike's throttle is at idle, the Power Commander will recognize it as 0% throttle position. If this adjustment is needed but not made, your bike may be at idle but the Power Commander may read it as open or closed to a different degree (for example 5%) and send the fuel adjustment intended for a 5% open throttle to the ECM when your bike is actually at idle  How do you know if you need to adjust TPS values on your Power Commander? One indicator is the row of green lights on the front of your Power Commander. When the Power Commander is powered up on your bike and the bike is at idle, or when it is powered up on your computer with the 9v adapter, only the bottom green light should shine, as this indicates the lowest fuel/air ratio. If two or more lights shine when no additional fuel is added, this indicates that the Power Commander is mis-reading the TPS values.   Dynojet includes a very user friendly tutorial for adjusting the TPS values in the Control Center Software which accompanies every Power Commander. You may also access this tutorial by clicking on the link below   Click here for Dynojet's TPS Adjustment Tutorial

Oxygen Sensor Eliminator Closed loop circuits have limited operating ranges in effect only when maintaining a constant  speed at specific throttle positions and rpm's. In this operating area, a stock closed loop system will temporarily lean the exhaust ratio with the goal of bringing the air/fuel ratio to 14.7:1 (stochiometric).  You can disconnect the O2 sensors but with the effect of tripping the F.I. warning light on the dash.  The O2 Sensor Eliminator disables closed loop systems on models equipped with O2 sensors (For racing use only).