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Discussion Starter #1
has anyone ran a factory ecu with a piggyback, big injectors and a o2 sensor?
i want the factory o2 to regulate cruise and idle a bit better, i can make a voltage switch to disconnect it as soon as im at any given psi or just let the ecu build a map then disconnect it.

currently using an emanage ultimate ecu, and mines ecu. just providing tricky to tune off boost.
 

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A few years ago I had the stock ECU plus a MAPECU piggyback running Siemens injectors; I think they were 750cc or a tad larger. I used the OEM O2 sensor for the stock ECU and a NTK O2 sensor for my wideband display but the NTK did not control fuel. I had no reason to ever think about disconnecting the stock O2 sensor and it always ran perfectly fine. You don't want to fight the stock ECU below ~4000rpm or so.
 

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Discussion Starter #3
So yours always tried to go back to 14.7:1 on cruise and idle etc?
 

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yes
 

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Discussion Starter #5
Ok cool! Ive got to take my dump pipe off tonight anyway so i may aswell put a spot for the factory o2 back in. I can always disconnect it later anyway.
 
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