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The Passat throttle body will only have a Throttle Position Sensor (TPS) on an AUTOMATIC car. Automatic G60 Corrados also have them. Some California-Emissions cars in the early 90s have them as well. If you do get a non-TPS throttle body from one of these cars, a new TPS can be added. But they aren't cheap!

When not to use a TPS

Remember - Megasquirt uses the TPS solely for Acceleration Enrichment (AE). That means MS gives it more fuel when you put the pedal down for a quicker reaction. With MSnS-e, or Megasquirt II, you can use MAP based AE, which will use MAP readings to replace the TPS. This is slightly more accurate, and simpler to do.

When to use a TPS

If you use ITBs, then you cannot get accurate vacuum readings from the throttle bodies. In this case, you do not have to hook up the Megasquirt vacuum line at all, set the Megasquirt to Alpha-N fueling equation, and use the ITB's built-in TPS to take care of everything.

You also may want to use a TPS if you are studying data logs to make tuning changes. This helps you know exactly what your foot was doing while driving.

WAY MORE info to come very soon! 

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