Wrapper

[ekpolk]

Originally Posted by Camralon2343

basically, there used to be an actual cable that connected your foot to the throttle in the engine. with DBW, there it no physical connection between the gas pedal and the actual throttle plate. Its all electronic. The ecu senses how far your foot is on the peddle, and then opens the throtel plate accordingly. Sometimes theres a little lag as this is happening, and if your not used to it, it has a different feel to it. Deff. have that TSB applied though. Your transmission is also electronically controlled, so software plays a big part in the way it preforms. .

And to add a bit more to that good description, the interposing of a computer (the ECU) between your foot and the throttle had created the opportunity for the engineers (mechanical and social...) to get in there and "filter" the car's responses. I used to have a 2003.5 V-6 Camry and an 04 Infiniti G35, both had DBW. The Toyota system had clearly been programmed second guess the driver in order to maximize fuel economy. It's as if the ECU is thinking, "OK, he just got on the gas, I'll wait a few microseconds before I command a full open throttle plate to see if he really means it, or if he's going to back off." Of course, I know the ECU doesn't think in English, but you get the idea. Big Brother now lives under your hood. Alas, Big Brother doesn't know or care if you happen to be attempting a merge in front of a speeding 18-wheeler... By contrast, the G35's system was not afflicted with such conflicts in its personality. You call for power, you get it NOW. My TCH is obviously DBW, but for whatever reason, responds much more crisply than the Gen-5 I had did. Here's a picture of the mechanism on the Gen-5's intake. Note the absence of a cable linkage.