Camaro LT5

[F'in mine]

Originally Posted by Stielow

Working on cleaning up the wiring on the LT5 crate harness. The LT5 uses 2 ECMs.
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I guess the 2nd ECM triggers the other new port injection system. How are they activated, engine rpm?

[WSSix]

That's what I'm wondering, too, Simon. I didn't realize these engines had two ECU's

[Stielow]

Originally Posted by F'in mine

I guess the 2nd ECM triggers the other new port injection system. How are they activated, engine rpm?

The 2nd ECM S53 is basically a slave ECM that drives the 8 extra Port Fuel Injectors. It is controlled by CAN messaging from the primary E99 ECM. The engine calibration lives in the E99 ECM.

This is needed because a LT5 has 8 Direct Injectors and 8 PFI injectors.

HP Tuners has cracked into the ECM so now you can tune it.




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