It would be sufficient for getting close enough to the shift points. For that purpose, you really only need to graph torque 500-1000 RPM on either side of peak HP. The method would be a conservative approximation because it neglects wind and rolling resistance. It could be done in 1st gear to minimize those errors.
It would not be as satisfying as a full-range (0-max RPM) set of curves from a dyno like we're used to looking at. But for those of us without practical access to a dyno, it would be just fine for a nominal shift point basis. Or as a baseline for before/after experiments. However, don't go off and do work on my account since my car won't be running for a while... - GT > -----Original Message----- > From: Joe Smalley [mailto:[EMAIL PROTECTED]] > Sent: Sunday, September 29, 2002 4:07 PM > To: [EMAIL PROTECTED] > Subject: Re: Dynamometer testing > > > Last Millennium (about 17 years ago) I had a computer system > that looked at the tachometer pulses off an engine (or motor) > and would plot the RPM as a function of time. If you entered > the gear ratios and the weight of the vehicle, the system > would also calculate the torque and horsepower curves during > that acceleration. I built this for a friend that said " I > would give someone $100 to tell me the optimal shift points > for my car." I only charged $25 for the service and $1 for > each printout of results. > > About 12 years ago, I upgraded the system to use a gAnalyist > for input device instead of the tach signal to work better > with non-lockup torque converters. > > The original software is in my archive somewhere and could be > updated to get it to run in a currently supported operating system. > > If it were ported to Windows, the only special resource > needed to run the software would be a sound card to input the > tach waveform. > > Is there any interest in doing this? > > Joe Smalley > Rural Kitsap County WA > Fiesta 48 volts > NEDRA 48 volt street conversion record holder [EMAIL PROTECTED] > > > ----- Original Message ----- > From: "George Tylinski" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Sunday, September 29, 2002 10:13 AM > Subject: RE: Dynamometer testing > > > I wonder if a "traveling dyno" exists that could be transported to > > NEDRA events... > > > > - GT >
