Quote:
Originally Posted by sedate_driver
.... Your first assertion that it becomes more sensitive because it remaps the throttle response is correct, is a fact, and is what SB claims. Your second assertion that you can achieve the same thing by mashing your pedal to the floor is no longer a fact. It contradicts your first assertion because remapping the throttle response clearly will produce a different result no matter how much or little you mash it. Mashing the pedal may get you to the same signal strength and, if you have a very finely modulated foot, even at about the same time as the SB but what you won't get is the response linearity. Whether linearity is important to you or not is a matter of subjectivity and is no longer a fact.
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Interesting comments on linearity. The link that used to be in the first few posts in this thread, and which is now attached above, shows some independent third party measurements from the throttle position sensor relative to the SB output. It appears from that testing, and I am assuming here that the MB model is pretty similar to the BMW model of the SB, that the SB applies a 30% gain to the throttle out put voltage. That gain appears to be constant from all the graphs in that attachment. That implies that there is no change in linearity of the signal with or without the SB. That conclusion also matches the SB web site graphs, which approximate two straight lines, but with different slopes.
A case could be made that a linear output voltage is not the same as a linear butt dyno evaluation. Perhaps much more throttle signal is required to get what feels linear to a trained driver, analagous to a stereo volume control that increases sound pressures exponentially. That is a rough analogy, but hopefully it makes the point. I agree that whether linearity is important is a subjective thing. However, the fact remains that the SB doesn't change the throttle linearity according to the tests.
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