Why have a dyno for ECU flash development?
Dyno vs. datalogger - USE BOTH !!
When tuning an engine, there needs to be tools that can measure small
changes in horsepower and torque in controlled conditions for the results
to be meaningful.
Today's eddy current dynos can simulate any load condition that an engine
will see on the road, and can measure within 1/10th of a hp.
This gives an experienced tuner the best possible tool for doing his/her
Using a datalogger when dyno tuning is the best method for collecting
engine data and using specific software to view and analyze small changes
that won't show up in on-the-road datalogging.
What is datalogging?
Datalogging is the collection of data from various sensors while the engine
is running, throttle position sensor, MAP sensor, coolant temp sensor,
wideband AFR sensor, rpm input,
and whatever else a tuner wishes to record and look at for how an engine
Using a basic logger exclusively (without a dyno) does not give the whole
picture that a good tuner needs to properly develop a performance ECU
flash for a stock ECU.
If you have very little adjustment capability, I suppose that using a
logger only for fuel adjustments can be useful and give an improvement.
(if you know what you are doing and your outside conditions are the same
for each test that you do... wind will play a major role for repeatability
But, a datalogger alone can't be used for ignition timing adjustments,
sub-throttle adjustments, and all the other very significant HP and driveability
must be carefully measured, adjusted accurately and repeatedly for the
results to be meaningful and useful.
These items need to be tested in a controlled environment over and over
and adjusted until it's right.
My ECU flash development cycle involves hundreds of dyno runs, and hundreds
if not thousands of flashes before the product is ready.
During tuning, the ECU can be flashed 20-30 times a day or even more at
times. This will happen for several months.
Every facet of the tune needs to be tested, adjusted, re-tested, and road
tested over and over.
Sometimes adjusting one part of the file requires minor adjustments in
a part of the file that was done already
This is the way that fine,
thorough tuning is done.
Using a dyno and datalogger together for ECU flash development is the
only way to properly test all the conditions that an engine will see on
and also can simulate any load/road condition that an experienced tuner
needs to see.
Will using a $300.00 datalogger without a dyno yield some improvement?
Sure it will, but it will not be able to give a similar result to the
massive amount of data that was carefully measured, calculated, analyzed,
and adjusted in a controlled environment by specialized equipment (Dyno)
by someone who is intimately familiar with this type of equipment.
The end result after dyno tuning is beyond comparison.
In my quest for offering the best product possible from my business, I
have purchased the latest and greatest industry standard dyno,
with every option that they offer for it, to replace my old dyno that
I have used since 1997.
This will allow me to simulate any on-the-road load condition that I ask
it to, and to analyze any aspect of engine tuning that I connect it to
all in a temperature controlled environment. Using this and the latest
logging and log analyzing software helps ensure that I am doing the best
for my customers.
After the tune is completed, it is logged on the road for any deficiencies
and corrected if any are needed (rarely)
Tuning without a dyno is like claiming to be a great carpenter that doesn't
use a tape measure.