Home brewed cheap Dyno

[Alain Marchildon]

After reviewing the home dyno software package available on the F-body list
it got me thinking that if you want an accurate home built dyno with the
least amount of money invested the best way to go would be similar to what
is already done but instead of calculating the vehicle speed with the trany
diff and tire ratios why not use the speed sensor that is buried the dash
of most modern cars, they give something like 2000 pulses at 60mi/h and
then get an inductive pickup to read the engine speed like the Dynojet
chassi dyno do except instead of reading the car speed they read the drum
speed.
The rest is pure math.

The home dyno records the pulse from the inductive pickup on a small plain
voice recorder and then feeds this to a sound blaster card to produce a
WAVE file then reads this file.

A stereo recorder could be used to record the inductive pickup and the
speed sensor one on the right channel and the other on the left to get two
distinctive pulse patterns and produce a WAVE file then read it and
calculate what we need to get car speed engine speed and the rest for HP
and torque.

Very cheep way to get a reliable chassi dyno.
Most of us have a inductive timing light, computer with sound blaster.
Only thing missing is a stereo tape recorder (a stereo camcorder would be
perfect)
And a few feet of cables and a few plugs and the big one the software to
convert the pulses in the WAVE file to readable format for you favorite
database program.

Any one interested in writing a simple bit of software to convert this?


// marchildon at usa.net                                            //
// Alain Marchildon                                              //