A4 shifting question?
A4 shifting question? Sometimes at WOT my tranny will drop but it wont go all the way to redline it will stop like at 5000 rpms and shift to the next gear but sometimes it will go all the way and shift like its supposed to. Why does this happen on occasion? Anybody else with a similar problem?? Its pretty embarassing to be racing from a roll and the tranny doesnt let me use all my power.
You'd have to catch it in the act, but one possibility
is the TPS and the throttle mechanically being a bit
short. "WOT" is defined as 94% TPS normally. If you
have a throttle blade opening less than fully (as many
see, stock) you may be just barely making it over the
threshold to use WOT shiftpoints and sometimes fall
back into part throttle shifting tables instead. A scan
while driving WOT would indicate whether this is it.
Or a voltmeter on the TPS output & ground wires,
even parked / key-on / matted, looking for a nice 4.6V
reading.
If you haven't worked over the throttle body ("bump
stop mod" at the least, you might want to take it
further into porting), inspected / snugged the cables
and verified that floored pedal = dead-center-open
throttle blade, that's where I'd start.
is the TPS and the throttle mechanically being a bit
short. "WOT" is defined as 94% TPS normally. If you
have a throttle blade opening less than fully (as many
see, stock) you may be just barely making it over the
threshold to use WOT shiftpoints and sometimes fall
back into part throttle shifting tables instead. A scan
while driving WOT would indicate whether this is it.
Or a voltmeter on the TPS output & ground wires,
even parked / key-on / matted, looking for a nice 4.6V
reading.
If you haven't worked over the throttle body ("bump
stop mod" at the least, you might want to take it
further into porting), inspected / snugged the cables
and verified that floored pedal = dead-center-open
throttle blade, that's where I'd start.
