"Throttle Controller doesn't improve performance of the engine"

TRUE and FALSE.

Please don't forget that the ECU reads the signal from the TPS to compute the "Load". It's not about how far/deep you depress the accelerator pedal, but how fast you depress the pedal.

Look at these hypothetical graphs: -
(no intention to promote anything but this is all I have)



Take SP7 mode as example, the slope of the graph is greater than 'Nor' (unmodified signal). This slope is interpreted by the ECU as 'rate'. Greater the rate, higher 'load' the ECU reads.

Higher load = more ignition advance = better performance = better throttle response = faster acceleration.

Can you achieve the same result without an ETC? Technically YES.

Case study:
In SP7, it takes 50% lesser accelerator depression to achieve 100% (check graph above). If time is factored into the the X-axis, and you depress the accelerator 2x quicker, you can get the ECU into reading the same 'load', but your foot also need to work faster.

If 'throttle response' is a sensation of the relation between your foot work and the engine behaviour, then, working faster with your foot DOESN'T make the throttle more responsive.

Electronic throttle control is actually part of BMW i-drive, or other similar system that regulates the rate of throttle pedal depression.

Honda CR-Z has the same system built-in, just FYI.

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Added on November 4, 2011, 1:46 pmBut don't trust me in this. I am a business person and I am always bias.
Do your own study, but try to understand what I am trying to tell, first.

This post has been edited by drexchan: Nov 4 2011, 01:48 PM

Therefore the price, logic?

In addition to that, you only talk about ONE particular model. Lets talk about CARS IN GENERAL shall we?

This post has been edited by drexchan: Nov 4 2011, 11:13 PM

Still relevant.

And ETC is not about adjusting throttle offset, so you are commenting out of context.

This post has been edited by drexchan: Nov 4 2011, 10:57 PM

Similar, but not identical. ETC doesn't play around with the offset. But you can have both done and still work perfectly.
The only draw back is that, the calibration of the ETC (S.O.P. after installation) may render the improvement from the throttle off set adjustment useless.

Why driving harder is not the same as what you can gain from using ETC in Sport mode? It's all about 'throttling rate' - the slope of the throttle graph (above).

The ECU reads how aggressive the pedal is depressed and interpret this as 'throttling rate', or pedal deflection rate. Higher throttling rate triggers aggressive ignition timing advance, thus improving the power output of the engine in response to the footwork.

The sensation of the relationship between footwork and engine behavior, is called throttle response. Good throttle response is described as getting satisfactory engine response while being light footed.

Being heavy footed without modifying the throttle graph may achieve the same throttling rate. However, this doesn't make the throttle more responsive, you are just driving it harder.


Why "throttle off-set adjustment a.k.a. PDT" (famous among campro users) is different from a proper ETC (electronic throttle controller)?

What's "throttle offset adjustment"? Forcing the ECU to learn a lower V as 0% pedal depression. Result is that, at 0% actual depression, ECU is reading it as 'being depressed at a certain %". At any deeper depression, the ECU reads higher.

1) Effect is minimal for a problem-free adjustment
2) Can only reduce throttle lag, not the signal profile.
2) Greater effect comes with draw-backs.
3) No on-the-fly adjustment

This is a factory default 'trick' for the service engineer to solve unstable idling, not a S.O.P. to improve the throttle response.

JUST LIKE ADJUSTING THE CABLE FREE PLAY.


The mechanical-equivalent of electronic throttle controller (ETC) is an undersized throttle pulley, NOT by adjusting the throttle cable free play.

This post has been edited by drexchan: Nov 7 2011, 06:08 PM

This is a technical sharing topic, not a sales topic.
Ask for it else where.

as explained, you can change the throttle pulley if you can find someone making it.

Totally negligible.