[Shotimes] Dyno charts

[Ron Childs]

What I am saying is that if peak torque is at a low rpm, and you run the 
engine at low rpm, you are not going to get squat for h.p. at the wheels. A 
CVT will not multiply horsepower. You give up torque in exchange for rpm (at 
the wheels) as you accelerate. It takes a given amount of hp to propel a car 
at a given speed. If you have 400 lb-ft of torque at 1500 rpm, you still 
only have 114 horsepower.

Your car will only accelerate as fast and go as fast as 114 hp would take it 
at that rpm. If your engine will maintain that torque at 3000 rpm you would 
then have 228 hp an be able to go that much faster. Horsepower comes from 
rpm as well as from torque.

-Ron Childs



>From: "D Potter" <jpotter8@bellsouth.net>
>To: "Ron Childs" <rchildssho@hotmail.com>
>Subject: Re: [Shotimes] Dyno charts
>Date: Sat, 18 Jan 2003 06:37:51 -0500
>
>Uh, Ron, as far as I can tell, when you compare ANY two rpms, you will be
>moving more pounds of car per unit of time at the higher rpm EVERY time.
>
>Unless you meant something else, in which case I can honestly state that I
>have no idea what you were trying to say there.
>
>Peak hp is not some magical number that means something as far as engine
>performance is concerned. It is nothing more than the point at which the
>percentage of decrease in torque exceeds the percentage of increase in rpm.
>
>It seems to me that it would make sense to run a CVT based motor at peak
>torque during WOT and at lower rpms during non WOT conditions to maximize
>fuel savings. Unless someone finds a way to equalize or reduce frictional
>losses as rpm increases.
>
>
>DP
>
>
>
>
>----- Original Message -----
>From: "Ron Childs" <rchildssho@hotmail.com>
>To: <jpotter8@bellsouth.net>; <BJamesjr@aol.com>; <shotimes@autox.team.net>
>Sent: Friday, January 17, 2003 12:13 PM
>Subject: Re: [Shotimes] Dyno charts
>
>
> > Your engine will be doing the most work (moving more pounds of car per
>unit
> > of time) at peak h.p.
> >
> > -Ron
> >
> >
> >
> > >From: "D Potter" <jpotter8@bellsouth.net>
> > >To: <BJamesjr@aol.com>, <shotimes@autox.team.net>
> > >Subject: Re: [Shotimes] Dyno charts
> > >Date: Fri, 17 Jan 2003 11:40:57 -0500
> > >
> > >You are going to get the most pull at peak torque, not peak hp.
> > >
> > >
> > >----- Original Message -----
> > >From: <BJamesjr@aol.com>
> > >To: <shotimes@autox.team.net>
> > >Sent: Thursday, January 16, 2003 12:56 PM
> > >Subject: Re: [Shotimes] Dyno charts
> > >
> > >
> > > > > Several cars now, and more to come have CVTs, Continuously 
>Variable
> > > > > Transmissions. Although their behaviour depends on programming, 
>the
> > >ideal
> > > > > for performance is to let the engine rev to peak hp and the tranny
> > >will
> > > > > adjust and accelerate the car. Wide torque band no longer
> > > > > needed.
> > > >
> > > > This concept has always interested me, although I'm still skeptical 
>of
> > >the
> > >internal workings of the CVT's themselves.  The computer could track 
>your
> > >throttle position and speed and determine from that if you were trying 
>to
> > >maintain steady state speed or accellerate.  If you are trying to
>maintain
> > >steady state speed, the computer can calculate what rpm is most 
>efficient
> > >for the engine in terms of fuel usage at that power level and tell the
> > >transmission to shift as required to put the engine at that power 
>level.
> > >For accelleration it can do the same- determine what power level you 
>want
> > >and what engine rpm is best for that level of power output.  At some
>point
> > >it would have to determine that the power output you want is beyond
> > >efficient operation and begin transitioning to higher rpm's, all the 
>way
>up
> > >to eventually the rpm equating to peak horsepower at WOT.
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