What do you think of DEI (Direct Exhaust Injection)?

07 Sep 2016

Ok. I didn’t want to mention it but I was thinking about twin-turbocharging my truck. I got to thinking about it and how in efficient even turbos are (compressor efficiencies of about 80% at best).

Since a turbo’s function is to pressurize incoming air and force it into the upper motor, and turbos are driven by high pressure exhaust gas created from the combustion process, couldn’t I just bypass the turbo altogether and route my headers back into the throttle bodies?

Since I have EFI, I could balance the DEI (direct exhaust injection as I just coined it) by feeding one header into each throttle body. Yes, the charge air wouldn’t be that cold, but it would be under a lot more pressure.

There are still a few things I need to work out:
1) How do I get the EFI aircleaner to fit in a way that hides this plumbing?
2) Does anyone make a V-band clamp that will bolt an exhaust header to a EFI throttle body?
3) What pinion angle should I use in my rear-end? I’m sure there will be a noticeable difference in torque output.

What do you guys think?
(Yes, this is a joke)

Comments

Most cars do inject exhaust-gasses into the “fresh” air, a small percentage.
It’s done to control how much oxygen the car gets, mainly.

Like max said thats what an egr valve actually does. I think your direct method may turn over once maybe twice 😂. Put an intercooler in between for more power aswell 👌 .

The egr does that for you (for emission elimination and cooling). Connecting the exhaust directly to the intake would let the engine die as there is no oxygen to burn with, also you would not have any boost at all, because the exhaust gasses are not compressed oxygen (air)