2008-2013 Cadillac CTS Performance Mods Discussion, converting non-DI to DI in Cadillac CTS Second Generation Forum - 2008-2013; I have access to an intake, fuel rails, plenum, and injectors for a direct injection cts at about $100 bucks ...
I have access to an intake, fuel rails, plenum, and injectors for a direct injection cts at about $100 bucks as this guy is parting it out and needs it gone asap. mine is currently non-DI. I was wondering if anyone knew what it is involved with doing the swap. i know its a far shot but being that i can get the parts so cheap i wanted to check. the stealership said they could do the ecu for me, just wondering what the difference is in the parts category. thanks guys for any feedback.
I think it would be far earier to just get the whole engine from the guy and swap it in. At a minimum you'll need the heads and the injectors as well. If you can get the engine wiring harness for the DI as well it should make hooking the injectors and other sensors up a bit simpler. I really don't know if the DI heads are direct bolt on for the non DI block or not. Are the pistons the same in both engines?
You're also going to need the DI fuel pump and all the small pieces in the fuel delivery system since it operates at MUCH higher pressure than the non DI version.
This sounds lie a MAJOR project to me. Good luck and let us know how it goes.
The heads have to be different. DI means direct injection. The injectors put the fuel directly into the combustion chamber. In non DI engines, the injectors put the fuel in the intake manifold runner near the head intake port. That's also why the fuel pressure has to be so much higher. The injector has to overcome the cylinder pressure under full compression and heave enough pressure left over to atomize the fuel.