Most ecu's work by FUEL TRIM, in which the ecu injectors fuel from a set map then takes a reading from the O2 sensor. This is why I DO NOT recommend the S-AFC unit to anyone because of the fact it cannot control timing (or at least have the ability to retard it). While this is fine for when you really are not putting a large load on the engine (IE off boost), this can be DEVASTATING to your engine in that since the timing has been advanced in a high load area the chances of detonation is greatly increased! :mad: So say you have to pull fuel because your larger injectors are dumping to much fuel what happens is the ecu thinks there is LESS air entering the engine thus thinking there is less LOAD, well less load means that its safe to advance the timing to help with combustion. When you use the piggyback to control larger then stock injectors you typically interface the MAF/AFM/MAP sensor and modify the signal going to the ECU. This is by far the LARGEST concern on SELECTED piggybacks. (also some places test your DIAG port to see if the stock ECU is still there and working, which really sucks to be them) Stock ECU retained: In some cases you cannot remove the stock ecu because of local laws and what not, you can get away with using a piggyback as it can be hidden an allow the stock ecu to remain present for inspection.
Instead of getting a EMS just to tune in 550cc injectors, you can easily get away with a piggyback and in the end save 700+! Cost: Piggybacks can do allot for the price you pay for the unit. Piggybacks are more commonly used to help the stock ecu cope with larger then stock injectors as well as control timing to prevent detonation caused by to much timing advance (will explain later).ĭepending on the piggyback unit you can also use it to control extra injectors for water/alcy injection launch control open & closed loop control.to name a few. For example the SMT7 able to take control of the stock ecu's O2 sensor trim so you can tune to a user set AFR. Some piggybacks can replace certain functions of the stock ecu as well. They intercept/modify signals from your engine sensors that go to the ecu (or vice versa) and modify them to suit your needs. Piggybacks "black box's" are units that work along side the stock ecu rather then eliminate it all together. Well its been a while since i added something here and been meaning to write this up.
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