How to Dyno Your Motor and Run Your Car From Your Desk
We really wanted to know what
our car is going to run with the changes
we had made so far. We already had
Performance Trend's Drag Race Analyzer Pro
that we used for predicting throttle stop settings. We then purchased
their Engine Analyzer Pro software to compliment the other so we could
predict the whole package and find what we were doing wrong and what we were
already setup our dragster in the Drag
Race Analyzer and backed into the
previous horsepower numbers by using
actual ET and incremental numbers. All
that was left was to enter all of the
motor data into the
Engine Analyzer Pro
to determine Peak HP at what RPM and Peak Torque at what RPM. Taking
those figures we then entered them into the Drag Race Analyzer to predict the
The original set up at 36° timing
with a 7600 rpm shift and 5400 rpm launch. We had all of the details of air flow of the heads from
and all of the cam specs from
cam card. The software predicted that the motor would produce 708 Peak HP @ 5650
and 576 Peak ft/lbs Torque @ 5650 rpm and run a 1.16 60 foot, 5.09 @
137.10 mph in the 1/8th mile and 8.06 ET @ 163.80 mph in the 1/4 mile.
This is where it gets interesting.
Having already changed the
launch rpm six times and the shift rpm four times to find the best ETs.
Then we ran the dyno and the resultant sheets that were able to print.
Afterwards, we starting thinking of other tweaks we could make. What if we played with timing, what would
happen? Starting at 36°, then running the timing all the way up to 40° and
down to 32°. When we lowered the timing from 36° to 34°. The Peak Torque
climbed to 582 ft/lbs and the motor gained 1 HP. We then adjusted the numbers in
the Drag Race Analyzer and the ET picked up .01 to a 5.08 in the 1/8th
and picked up .02 in the 1/4 to a 8.04.
Of course this software is like any other, garbage in,
garbage out but if you have all of the data and you spend the time to
enter it right, you can learn a lot about your car for a lot less money
and then make the right choices in new parts before you buy them. The
nice thing about the whole package is that you can play with one or many
changes for your car to get the most bang for the buck especially
concerning cams, gears, tires, carburetors, jets, heads etc.
article was originally written, 30
pounds of lead has been added to the
nose of the dragster. The dragster has
been running with this same basic
setup to a best 5.13 at 135mph in the
1/8 mile with a stunning 1.13 60'
foot. It is very common for the car to
run 1.15 - 1.16 60' times
depending on the air and track
conditions. We are sold that this
software is deadly accurate and in the
long run will save any racer a lot of