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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 job.

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 are difficult or not possible to see in on-the-road datalogging alone.

What is datalogging?
Datalogging is the collection (recording) of engine 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 to evaluate how an engine is running.

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 test conditions are the same for each test that you do... wind, road, and traffic conditions will affect repeatability accuracy)

But, a datalogger alone shouldn't be used for ignition timing adjustments, sub-throttle adjustments, and all the other very significant HP and driveability improvements that
must be carefully measured, adjusted accurately and repeatedly for the results to be meaningful and useful.
These items should 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 best way to properly test all the conditions that an engine will see on the road…
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 for my customers, 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.



Below is a screenshot of one of the tuning programs that I use for viewing fuel mixture.

This is a low rpm view of a bike's fuel mixture during tuning of it's vacuum tables (MAP)

It's far from perfect, but it's just a screenshot of what this type of equipment allows you to see.
When the fueling is correct, there's a more uniform color that starts in one color and smoothly transitions to another from left to right.

Having this type of view allows me to see a lot more than a single line shows at full throttle on a dyno chart.

If you look at the bottom row (X axis), it reads in the vacuum level that I have my logger calibrated to. (trying to explain this in simple terms)

RPM is on the left vertical

AFR (fuel mixture) is on the right vertical

New Dynojet 250I



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