Stall speed allows the vehicle to launch more inside it's power band on a
higher HP engine. This has to do mostly with a high perf. camshaft not
creating the required power until higher RPM's, and therefore not getting a
quick jump off the line in a drag race.
Let me say that if it is a daily driver that will see lots of traffic, like
stoplights and such, and you also find that it is possible to swap in this
converter, that city traffic driving is hell. Cruising in a long line of
cars with a stop signed intersection is NO fun. I've done it in a full
sized 1986 RAM. Basically it forces you to give it lots of throttle, and
then it will seemingly smack into gear and start to move. It isn't meant to
take the heat and abuse that stopping in drive and sitting there does.
(Most people should shift their tranny into neutral and hold the brake at a
long light anyway.)
Also higher stall converters get the fluid warmer than lower stall
converters. The energy has to go somewhere, and since it isn't being used
to move the car, then some of it is converted to heat.
Stock stalls can vary, but most are just below idle speed, I suppose
somewhere around 600-800 RPM's and that's usually why if your idle is too
low it doesn't move. Most people that haul large heavy loads use a lower
than stock stall speed.
On a side note, I just rented a car and they handed me the keys to a 2000
Cavalier. What a dung heap. It didn't even move unless you gave it gas,
but I'll bet that is GM trying to watch out for the foolish people that buy
them so they don't rear end someone at a stoplight. Or it had some settings
outta whack. After all, who treats a rental nice at all?
Basically in a Dakota you could probably go with a little more than stock,
but I don't know how the computer comes into play with the new trucks. If
these 45RFE's have lockup torque converters and stuff like that that the
computer controls I wouldn't know what to tell you. I'm guessing they do
have lock up clutches in them, since most all of the latest Mopar trannys
have had them.
That's about all I know...
Matt Schroeder
'89 Dakota Sport 3.9L
1996 Jeep Grand Cherokee
1986 Dodge D150 318 with Streetfighter tranny & converter
*Lookin' for a '78 or so 4WD truck*
----- Original Message -----
From: "Sean Bruckman" <bruckman@urisp.com>
To: <dakota-truck@buffnet.net>
Sent: Friday, July 14, 2000 12:42 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
> > > |
> > >
>
>
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:52:38 EDT