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BigStuff3 Transmission Input (shaft) Speed Sensor (TISS)

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Part#: JMI-003-018

  BigStuff3 Transmission Input (shaft) Speed Sensor (TISS)

Fits On:

All Vehicles (Universal)

The Trans Input (shaft) Speed Sensor (TISS) and Trans Output (shaft) Speed Sensor (TOSS) measure the input and output speeds of the transmission so the GEN3 ECU can determine when to lock the converter, how much slip to allow with an unlocked converter, the vehicle load, the shift pressure, and the vehicle speed. The TISS and TOSS sensor connectors are identical in shape and color. It is important to make sure these connections are made to the correct speed sensor on the transmission. Terminating these connectors to the wrong transmission sensor will effect transmission operation and could damage the ECU, thus voiding the warranty.
Q: What is an engine management system? Why buy one? How does an engine management system different from a Piggy Back Programmer?
A: An engine management system is essentially the brain of your vehicle. Aftermarket engine management systems replace your OEM computer (ECU) with a performance version that gives you tunability so that you can maximize the power of your vehicle and optimize the other aftermarket components you have added to your ride. While your stock ECU may be fine for daily driving, it is programmed with a large margin for safety built-in, which in turn sacrifices performance. An engine management system will let you push the limits a little more, while still staying in a safe tuning range to drastically improve performance throughout the entire power band. Engine management systems are also easily uninstalled if you ever decide to sell your ride or just want a milder tune.

The main difference between an engine management system and a piggy back programmer is that the engine management system completely replaces the ECU, while a piggy back tunes through the stock ECU. This usually means that piggy back setups have limited tuning capabilities due to limited access in the stock ECU from encryption and other security features. Piggy backs due usually maintain the stock safety features of the OEM ECU which means there is less risk of destroying your motor. With engine management systems you gain complete control of all tuning parameters making them the superior device if you want to really dial in your vehicle. However, it is important to find a competent tuner and utilize a chassis dyno in order to carefully tune your vehicle and prevent premature engine failure.

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