Hello, i have a Toyota Aristo jzs161 i have thoughts on building single turbo.
Ive seen that i should let the stock ecu control the automatic trans, could someone explain how this works.
Do i just leave some pins in the stock ecu and connect the others in the aftermarket ecu?

 

Short answer is yes.

You can buy a plug 'n play harness to let a standalone ECU handle engine management while letting the factory ECU handle everything else.