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Audi Multitronic
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At 07:27 AM 3/29/2002, Brian Wagner wrote:
>Isn't that the same as a CVT?
Yessirree Bob.
>The tranny Subaru but in the 3 cylinder Justy when they sold it a few
>years back?
Right.
> Basically the are like a go cart friction clutch with variable pulleys
> and a metal drive belt to give you a unlimited range of gears and no
> harsh shift points. Kinda neat.
Brian, under full throttle, CVTs generally adjust the gearing continuously
to keep the engine at its HP Peak. One would think you want the torque
peak, but horsepower is a measure how fast an engine can do work
(torque). The HP peak is where an engine can do the most work fastest.
Obviously this is a departure from what we're all used to hearing -- but
with a quiet engine, it's probably not all that strange. That being said,
I've never driven a CVT personally... but the efficiency and acceleration
benefits are quite substantial. The reason that they're first appearing on
larger cars now is because previously, the technology to make the
belt/pulley assembly reliable for high torque engines wasn't there.
In normal driving, it adjusts the "gear" ratio to keep revs and noise low.
Hope that answers your question.
Jason
>
>Brian
>----- Original Message -----
>From: <mailto:amalventano1@comcast.net>Allyn
>To: <mailto:Captnbr@aol.com>Captnbr@aol.com ;
><mailto:Scirocco-L@scirocco.org>Scirocco-L@scirocco.org
>Sent: Thursday, March 28, 2002 11:00 PM
>Subject: Re: Audi Multitronic
>
> ok, heres the deal, its a flat steel belt riding on 2 'v' pulleys.
> the pulleys are split down the middle and can seperate/close together
> (via hydraulics). each pulley does the opposite of the other, so the belt
> rides on different portions of the pulleys, resulting in a continuous
> change in tranny ratio.
> other car people have done this, but they preload the belt a whole
> bunch to prevent slipping (it is metal on metal after all), this results
> in low fuel efficiency/high wear on the belt. the multitronic system
> tightens the belt pulleys based on sensed torque at the pulley itself.
> this takes care of the inefficiency/high wear, since it only loads the
> belt when it needs to.
> the multitronic can go full auto (where engine climbs/stays at peak
> torque under full throttle acceleration), or it can do a simulated
> 6-speed, performing step changes in ratio based on driver input (kinda
> like tiptronic).
>that do it for ya?
>Al
>
>Allyn Malventano, ETC(SS), USN
>87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
>86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
>87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles, original clutch,
>driveshafts, wheels :)
>----- Original Message -----
>From: <mailto:Captnbr@aol.com>Captnbr@aol.com
>To: <mailto:Scirocco-L@scirocco.org>Scirocco-L@scirocco.org
>Sent: Thursday, March 28, 2002 11:25 PM
>Subject: Audi Multitronic
>
>Anyone have the 411 on how Audi's new multitronic Transmission
>works. They say there is no gears and no shifting. So how does it work
>when you floor it, does it just shoot up to redline and stay there? I
>just don't understand it. Anyone want to enlighten me?
>
>Brian 86 16v
>98 Jetta GLX Vr6
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At 07:27 AM 3/29/2002, Brian Wagner wrote:<br>
<blockquote type=cite class=cite cite><font face="arial" size=2>Isn't
that the same as a CVT?</font></blockquote><br>
Yessirree Bob.<br><br>
<br>
<blockquote type=cite class=cite cite><font face="arial" size=2>The
tranny Subaru but in the 3 cylinder Justy when they sold it a few years
back?</font></blockquote><br>
Right.<br><br>
<br>
<blockquote type=cite class=cite cite> <font face="arial" size=2>Basically
the are like a go cart friction clutch with variable pulleys and a metal
drive belt to give you a unlimited range of gears and no harsh shift
points. Kinda neat.</font></blockquote><br>
Brian, under full throttle, CVTs generally adjust the gearing
continuously to keep the engine at its HP Peak. One would think you
want the torque peak, but horsepower is a measure how fast an engine can
do work (torque). The HP peak is where an engine can do the most
work fastest.<br><br>
Obviously this is a departure from what we're all used to hearing -- but
with a quiet engine, it's probably not all that strange. That being
said, I've never driven a CVT personally... but the efficiency and
acceleration benefits are quite substantial. The reason that
they're first appearing on larger cars now is because previously, the
technology to make the belt/pulley assembly reliable for high torque
engines wasn't there. <br><br>
In normal driving, it adjusts the "gear" ratio to keep revs and
noise low.<br><br>
Hope that answers your question.<br>
Jason<br><br>
<br><br>
<blockquote type=cite class=cite cite> <br>
<font face="arial" size=2>Brian</font>
<dl>
<dd>----- Original Message -----
<dd>From:</b> <a href="mailto:amalventano1@comcast.net";>Allyn</a>
<dd>To:</b> <a href="mailto:Captnbr@aol.com";>Captnbr@aol.com</a> ;
<a href="mailto:Scirocco-L@scirocco.org";>Scirocco-L@scirocco.org</a>
<dd>Sent:</b> Thursday, March 28, 2002 11:00 PM
<dd>Subject:</b> Re: Audi Multitronic<br><br>
<font face="arial" size=2>
<dd> ok, heres the deal, its a flat steel belt riding
on 2 'v' pulleys. the pulleys are split down the middle and can
seperate/close together (via hydraulics). each pulley does the opposite
of the other, so the belt rides on different portions of the pulleys,
resulting in a continuous change in tranny
ratio.</font><font face="arial" size=2>
<dd> other car people have done this, but they preload
the belt a whole bunch to prevent slipping (it is metal on metal after
all), this results in low fuel efficiency/high wear on the belt. the
multitronic system tightens the belt pulleys based on sensed torque at
the pulley itself. this takes care of the inefficiency/high wear, since
it only loads the belt when it needs
to.</font><font face="arial" size=2>
<dd> the multitronic can go full auto (where engine
climbs/stays at peak torque under full throttle acceleration), or it can
do a simulated 6-speed, performing step changes in ratio based on driver
input (kinda like tiptronic).</font><font face="arial" size=2>
<dd>that do it for ya?</font><font face="arial" size=2>
<dd>Al</font>
<dd> <font face="arial" size=2>
<dd>Allyn Malventano, ETC(SS), USN
<dd>87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
<dd>86 Kamei Twin 16V Turbo Scirocco GTX ('it has begun', rocco #7)
<dd>87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles, original
clutch, driveshafts, wheels :)</font>
<dd>----- Original Message -----
<dd>From:</b> <a href="mailto:Captnbr@aol.com";>Captnbr@aol.com</a>
<dd>To:</b>
<a href="mailto:Scirocco-L@scirocco.org";>Scirocco-L@scirocco.org</a>
<dd>Sent:</b> Thursday, March 28, 2002 11:25 PM
<dd>Subject:</b> Audi Multitronic<br><br>
<font face="arial" size=2>
<dd>Anyone have the 411 on how Audi's new multitronic Transmission works. They say there is no gears and no shifting. So how does it work when you floor it, does it just shoot up to redline and stay there? I just don't understand it. Anyone want to enlighten me?<br><br>
<dd>Brian 86 16v
<dd>98 Jetta GLX Vr6</font><font face="arial"> </font>
</dl></blockquote></html>
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