Hi all,
Stall Converters 101 ...
"Stall Speed" is the RPM at which the veins in the converter quit
cavitating and it theoretically locks up and drives 1:1.
Stall can be construed as "SLIP" ... And when you SLIP you get way hot.
as in the fluid turns to vapor ]
Stall speed is determined primarily by housing diameter AND engine torque,
secondarily by internal configuration.
Conclusion : Stall converters on the street, require huge coolers and
pretty much preclude towing, lest you like rebuilding burned up
transmissions.
Because you can sit at the light and free-wheel the rpm's right into the
power band with light brake pressure, they will launch quite nicely. Slush
boxes are also quite a bit easier on the other driveline components, so they
really rock for racing.
HTH
--Ed
----- Original Message -----
From: "Sean Bruckman" <bruckman@urisp.com>
To: <dakota-truck@buffnet.net>
Sent: Friday, July 14, 2000 1:42 PM
Subject: Re: DML: Re: Re: 45RFE slippage..was comming in peace...hehehe
> Yes, it's a daily-driver. I told them that and that's what they came back
> with. Could someone please explain what various stall speeds mean...?
like
> 1000, 2500, 5000? Is there any kind of application other than drag racing
> these might be good for? Please explain the mechanics of what stall speed
> means. I know how a torque converter works...
>
> Sean
>
> --------------------------------
>
> Do you drive this truck every day?? A stall speed like that is for
> pro-street and drag strip. I was thinking about doing the same thing to
my
> truck and I drive my truck every day, so I let that one go.
>
> Aaron
>
>
> ----- Original Message -----
> From: Sean Bruckman <bruckman@urisp.com>
> To: <dakota-truck@buffnet.net>
> Sent: Friday, July 14, 2000 10:49 AM
> Subject: Re: DML: Re: Re: 45RFE slippage..was comming in peace...hehehe
>
>
> > I contacted protorque about a performance torque converter and they
swore
> up
> > and down it would be a very cost effective upgrade for my truck. Likely
> they
> > don't know much about the 45RFE either, but i have a feeling that it
> > probably would be a decent upgrade for the price. 495.00 + shipping for
> > their model PTC-T37LU90SS. I stated that i was getting around 230hp to
the
> > rear wheels (as i am) and that i have future plans to supercharge and
> modify
> > to about 400 RWhp. So perhaps that price is a little more than they'd
> > recommend for a N/A modified dakota. Regardless, a good torque convertor
> > would be nice. My understanding is that the parasitic loss would be much
> > less and the shifts would be firmer. (always nice to be able to squeal
the
> > tires from a higher speed)
> >
> > I don't know much about trannies either, and i have a question. The
> salesman
> > said this convertor had a stall speed of approx. 2500-2800. I am
mystified
> > by what this means. Someone please fully enlighten me of the glory of
> stall
> > speed. (high, low?)
> >
> > Sean
> >
> > ----- Original Message -----
> > From: Steven T. Ekstrand <cyberlaw@earthlink.net>
> > To: <dakota-truck@buffnet.net>
> > Sent: Friday, July 14, 2000 2:48 AM
> > Subject: Re: DML: Re: Re: 45RFE slippage..was comming in peace...hehehe
> >
> >
> > > Interesting. I do indeed have the cooler and it might indeed feel
like
> a
> > > lack of pressure at WOT which could be a lack of fluid.
> > >
> > > I'm dying for a shift kit!!! Come on Trans Go!!!
> > >
> > > Has anybody tried any of the hipo fluids? In the old days some of
these
> > > would swell up the bands...Sort of a poorman's shift kit! And tricks
on
> > > throttle position sensors to raise pressure? Band tightening?
> Anything!
> > > I know zero about these new trannies.
> > >
> > > -STE
> > >
> > >
> > > ----- Original Message -----
> > > From: <Hemikota@aol.com>
> > > To: <dakota-truck@buffnet.net>
> > > Sent: Thursday, July 13, 2000 4:13 PM
> > > Subject: Re: DML: Re: Re: 45RFE slippage..was comming in
peace...hehehe
> > >
> > >
> > > | In a message dated 7/13/00 6:05:46 PM Eastern Daylight Time,
> > > | cyberlaw@earthlink.net writes:
> > > |
> > > | <<
> > > | I love my 4.7 great sound. But the auto tranny seems to slip on
> full
> > > | throttle shifts. Shifts nice and crisp on part throttle. Can't
> figure
> > > | that one out?
> > > | >>
> > > | I think that they are under filled. Ignore your dipstick and add
3/4
> to
> > > 1 qt
> > > | over the full line. Seemed to help the same problem in mine. It
> likes
> > > to do
> > > | it in the 2nd to 3rd shift. AND I have the software upgrade for the
> > > comp.
> > > | The reason I think this happens is that the cooler is supposed to
flow
> > > some
> > > | ridiculous amount like 9 qts/min (If you dont have a cooler than
that
> > > blows
> > > | my theory). If this is so, then there may not be enough fluid
> > > circulating
> > > | for bad-ass acceleration. Hell If it hurts the tranny it will show
> > > within
> > > | the warranty period. What they really need is a good shift kit.
> > > | thats my 2 cents
> > > | Boog
> > > |
> > >
>
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