Holley's new EFI SEMA/PRI Brochure

[parsonsj]

Why would you want a DBW system? The only reason I see would be to hide one more cable in a show car.

Well... that's one reason. Not a very good one, I would say. Some better reasons might include:

1. Custom throttle pedal to butterfly opening ratios. There are few things more annoying to drive than cars with binary throttle blades. Those ratios can then also differ depending on throttle position sensor.
2. More control of function typically foisted on the IAC, like idle speed control for A/C, coolant warmup enhancement, or throttle follower programming.
3. It can be added to traction control programming.
4. It can be programmed to help support cruise control.

In short, putting the throttle body under computer control gives the ECU a whole new device that can be integrated into many engine-related functions.

jp