The relationship between torque is:
HP = Torque * RPM/5250 ( I think this is it)
Horse Power is a derived term and is the rate at which torque does work.
Dynos determine hp from this very formula with a lot of other factors
involved.
mayf
----- Original Message -----
From: "Larry Paulick" <larry.p@erols.com>
To: "Bob Palmer" <rpalmer@ucsd.edu>
Cc: "Fraser, Ron" <Ron.Fraser@usa.xerox.com>; <tigers@autox.team.net>
Sent: Wednesday, February 21, 2001 2:56 PM
Subject: Re: E-Mail me off the list
> Bob, my dyno guy is a class winner in his Buick, with 350 ci, and he
> used a slide rule like calculator to figure the quarter mile time with
> slicks, and a good driver using the combo I have.
>
> He said that it has proven very accurate for most of his customers, when
> they do everything right.
>
> He also mentioned that there was a rpm relationship with torque and hp,
> that was the same for all cars, but I don't remember what it was. I
> will have to call him back, and find out.
>
> He wins, and does a lot of very fast cars in his shop, and is know as a
> no BS guy, so I have a tendency to believe him.
>
> I need to read and learn a lot more, before doing anything else right now.
>
> Larry
>
> Bob Palmer wrote:
> >
> > Larry,
> >
> > It's interesting that this kind of mis-information is so pervasive. The
> > torque curve is definitely not what you want to use to pick the shift
> > points, although there seems to be a fair number of people out there
that
> > seem to believe it. There are computer programs that will compute
quarter
> > mile times based on your dyno data, car weight, gears, etc. They all use
the
> > right physics as far as I know. However, a lot of "seat of the pants"
racers
> > seem to have lost the rabbit.
> >
> > Bob
> >
> > -----Original Message-----
> > From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net]On
> > Behalf Of Fraser, Ron
> > Sent: Wednesday, February 21, 2001 8:18 AM
> > To: tigers@autox.team.net
> > Subject: RE: E-Mail me off the list
> >
> > Larry
> > I'm not sure about the 80% part but I did see an explanation
about
> > shift points.
> >
> > You need to look at your engine's Torque Curve and you need to
know
> > what the RPM change is for each of your transmission gears. The idea
was to
> > shift at an RPM after peak torque that would bring you to that same
torque
> > value before peak torque. This uses the Max Torque of the engine to
propel
> > the car. This seems to make sense but I do not know if will get you
down
> > the track any faster. I have never drag raced, only short bursts on the
> > street, so I'm no expert.
> > Ron Fraser
> >
> > -----Original Message-----
> > From: Larry Paulick [mailto:larry.p@erols.com]
> > Sent: Wednesday, February 21, 2001 8:58 AM
> > To: Bob Palmer
> > Cc: cvaught@hawaii.rr.com; tigers@autox.team.net
> > Subject: Re: E-Mail me off the list
> >
> > Bob, interesting point on the shift points. I understand having the
> > revs in the sweet spot, but how did the 80% come about.
> >
> > If I have the stock motor and cam from the 90 5.0L, and its max hp is at
> > 5200 rpm, the the shift point is 6500 rpm. That is quit a jump, and
> > with stock valve train, mainly springs, I am sure that valve float would
> > become a problem.
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