merchauser

using the bosch hammer my TPS switch seems to be operating and set up properly.
however, I think the WSM suggests that the WOTS kick in at 2/3 or 3/4 down on the accelerator pedal.
my WOTS kicks in at, or near the bottom of the pedal.

is this ok? if not, is this adjustable? and, what is the difference in the driving experience at those
different points?

FredR

As long as it kicks in when it actually happens is more or less irrelevant. It is quite normal for this contact to be made when the pedal is maxxed out or close to it but one should also remember that the throttle opening position is not proportional to the travel as the thing is actuated via a cam wherein at full range a little pedal opens the throttle much more- this facilitates better control during mid range operation and then when you really want to go for it the only position of relevance is wide open. When the contact is made the LH adds additional fuel and the EZ adds more advance to maximise power output.

Those of us who use ST2 can opt to cut out this process and achieve the same thing with the cruise maps for LH and EZ operation.

merchauser

not sure I understand what is meant by better control??


is it possible for the switch to work properly, and the LH and EZ not provide the additional fuel and advance? if I stomp on the pedal, I really don't "feel"
power kick in until about 4k, which is either the flappy or the cams???

FredR

If the butterfly control characteristics were such that a slight opening of the throttle produced max power you would be up the *** of the car in front before you could shout "Stormy Daniels". Good throttle control is essential particularly so on a powerful car so the choke size and butterfly operation are designed to achieve that to give good driveability. Once the air flow has reached a certain point the round town driving is over and one wants max throttle so the "cam" on the throttle actuator is profiled so that throttle response is reasonably linear to about 60% and after that a bit more pedal has the thing fully opened.

The additional power provided by the full throttle maps is subtle rather than spectacular. That you feel the motor come on strong at 4k is a mix of the flappy and the cam. The GT cam has a higher lift of the inlet valves than the S4 so it is a bit more top endish compared to the S4 that is a bit better mid range and that suits the auto tranny.

If the LH and EZ are working then you get the full throttle maps

merchauser

understood; thanks

dr bob

Some basic and often-overlooked stuff: Get a helper to push on the pedal, and make sure that the throttle is actually full-open when the pedal is down. More than a few ponies have been sacrificed to stretched and mal-adjusted cables. Since the WOT switch is at the end of that string of rubber bands, so things need to be just right to see a switch closed based on relative pedal position.

merchauser

good to know. will check that out.