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Posted by smoke on November 8, 2008, 6:22 am
 
Hi all,

Iíve just test drove a 2005 Prius ,
and I like the car so much, but there is one thing that
Iím not sure, hope you guys can help.

The car has a slightly stuttering on pickup from stand still.
The harder I press the gas pedal, the slightly stronger stuttering I
felt.
But all Iím talking is light stuttering, it was just like a gear
change.
But that shouldnít be any gear change on pickup I supposed,
am I right?  :roll:

Cheers



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Posted by Chas Gill on November 8, 2008, 8:40 am
 
Mine has always done that - although I think only when the ICE isn't
running.  Don't actually know what causes it but I imagine a couple of
things: - (1) Unlike a conventional car, the electric traction motor is not
spinning until you press the gas pedal, so has to spin up from standstill
itself.  There may be a little unavoidable roughness at very low revs that
is characteristic of all electric motors?  (2) Could it be that the ICE is
attempting to start at the same time as the car is accelerating from
standstill ? This might put an instantaneous load on the power train that
would translate to a little roughness in acceleration.

Like I said, I don' t know if either of these possibilities are fact, but I
do know that mine has done it since new and seems none the worse for it.  NO
doubt those more knowledgeable than I will contribute.

Regards

Chas



Posted by Elmo P. Shagnasty on November 8, 2008, 12:16 pm
 

My 07 has had a small pause in there from the beginning.

The harder I press the pedal, the more noticeable it is--not because
it's more of a pause, but because if I'm pressing harder that means I
want more out of it right now.

I've learned to feather the pedal a very tiny bit starting out, THEN
give it the full go I want.  But again, it doesn't matter--the same
lawyer-defined behavior is there no matter how I press the pedal.

Posted by Tomes on November 10, 2008, 3:08 am
 "smoke" ...

Here is what I think is going on, as mine does something that can be
described this way as well.

When the gas engine is off and you press on the pedal, it will start with
only the electric motor, then the gas motor will kick in.  It is supposed to
do this by design.  Since the type of gas engine it uses is not go good at
low rpm torque but really good at higher rpm performance, it uses the really
good low end torque of the electric engine to start it off, then the gas
engine kicks in.  I don't think of it as a stutter, but rather I would use
the word ever so slight shudder.

I believe what you are sensing is the gas engine kicking in after a second
of it moving off of zero velocity.  Like the other responders I would not
worry about this.
Tomes


Posted by smoke on November 10, 2008, 7:22 am
 Thanks all of you!
Now I have no more worry for that.
  :)  

I think I will go for the Prius that I test dove earlier.  :P
BTW., any common fault that I should bewear ?

Cheers,

George

"Tomes" wrote:
 > "smoke" ...
 > > Hi all,
 > >
 > > I've just test drove a 2005 Prius ,
 > > and I like the car so much, but there is one thing that
 > > I'm not sure, hope you guys can help.
 > >
 > > The car has a slightly stuttering on pickup from stand
 > still.
 > > The harder I press the gas pedal, the slightly stronger
 > stuttering I
 > > felt.
 > > But all I'm talking is light stuttering, it was just like a
 > gear
 > > change.
 > > But that shouldn't be any gear change on pickup I supposed,
 > > am I right?  :roll:
 > >
 > Here is what I think is going on, as mine does something that
 > can be
 > described this way as well.
 >
 > When the gas engine is off and you press on the pedal, it will
 > start with
 > only the electric motor, then the gas motor will kick in.  It
 > is supposed to
 > do this by design.  Since the type of gas engine it uses is
 > not go good at
 > low rpm torque but really good at higher rpm performance, it
 > uses the really
 > good low end torque of the electric engine to start it off,
 > then the gas
 > engine kicks in.  I don't think of it as a stutter, but rather
 > I would use
 > the word ever so slight shudder.
 >
 > I believe what you are sensing is the gas engine kicking in
 > after a second
 > of it moving off of zero velocity.  Like the other responders
 > I would not
 > worry about this.
 > Tomes

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