We do not sell maps, the result would be poor, so we developed methods to provide a service with enthusiastic results even for those who could not come to the Tuning Center.
Tuning, the juice is worth the squeeze
Many are the most widespread preconceptions against the tuning of the engines of our beloved motorcycles, especially those put around by incompetent or biased people; here is a quick overview: “they break your bike”, “it invalidates your warranty”, “it’s useless”, “have you ever exceeded 120 km/h with your Harley?”, “are you going to run on the track?
Obviously, I am biased, but I will still try to give you objective advice.
It’s true that a good Tuning won’t costs two cents, just as it’s true that the performance gains are not always stunning.
What is always true is the exciting feeling you get when you ride the bike after a good engine tuning: smooth power delivery, easier to drive, exuberant torque and very quick throttle response; if you’ve ever ridden a bike with a well tuned engine not with a canned map, but with a map accurately developed for the bike, you know what I’m talking about.
Is the juice is worth the squeeze? Yes, always.
Let’s consider prices, reliability and results.
Prices are absolutely sustainable: for our bikes we have often spent much more on accessories that have proved to be useless.
Reliability: a perfectly tuned engine is more efficient, cleaner combustion for the benefit of engine life and reliability, reduced fuel consumption, more torque and power and less overheating.
Results: increased joy of riding, smooth engine response in relaxed riding but powerful and aggressive in “critical” situations, with a motto: “you will never had such an exciting bike before”.
Tuning or not tuning depends on tuner, I speak for myself: what I wrote is true and verifiable.
What a Power/Torque Dyno chart can’t say
At the end of an engine tuning often the most desired thing by many bikers is a nice dyno chart (like the one in Figure 1) that highlights the power and torque gains.
- Red Lines : Standard Motorcycles.
- Blue Lines : Partial Stage I: Slipons and Tuning.
- Green Lines : Complete Stage I: Air cleaner, Slipons and Tuning.
The difference in terms of power and torque is remarkable, but dyno chart does not give a truthful idea whether the Tuning was really performed at the best.
Let us now try to give the reasons for this statement.
To obtain a dyno chart like the one in Figure 1 you keep the bike in 4th/5th gear at a regime of about 1600/1800 rpm for a few moments and then quickly accelerate to full open throttle up to the maximum engine rpm. In order to relata the dyno chart to the engine map, I have published Figure 2, which represents the table of the volumetric efficiencyIn internal combustion engine VE is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure of a cylinder and I have highlighted the column in which correspond to full open throttle: TP (Throttle Position) = 100%. The highlighted column is therefore the only part of the entire map table measured in a dyno run.
Mirror, mirror of the wall, who’s the fairest AFR of them all?
Amomg a heated discussion about the one who has the best chrome accessory or the darkest bike or durnig the complain for the amount of money spent on useless accessories, often we hear about ECM and stechiometric ratios.
Stoichiometric ratio: what an evocative word, but no does not refer to strange initiatory rites of ngorongoro, although often the “technicians” first speak of it as if they were.
The Stoichiometric ratio takes its name from the Stoichiometry that is the branch of chemistry that studies the quantitative ratios of substances involved in chemical reactions. The purpose is to identify right quantities of substances so that the chamical reactions are balanced.
For our beloved bikes the Stoichiometric tells us that in gasoline engines – in normal operating conditions – the ideal air/fuel ratio for a complete combustion is 14.7:1.
So talking about “Stoichiometric ratios” is totally inappropriate, the Stoichiometric ratio for a gasoline engine is one and only one 14.7:1.
Talking about “Stoichiometric ratios” in a gasoline engine is wrong as if we assume that in order to calculate the area of a circumference A we need a π A, while for a circumference B we need a π B.
There are no rich or lean stechiometric ratios!
Now that we have clarified what is a Stoichiometric ratios, that is: for gasoline-powered internal combustion engines the Stoichiometric ratios is one and is equal to 14.7 parts of air per 1 part of gasoline, let’s question the mirror of the wall about who is the fairest AFR and the disasters of those who venture to map based on myths and beliefs.
… continues on Jasper the “coalman”
Power Vision for Harley-Davidson 2020 models
|Power Vision EPV-1
|Power Vision EPV-2
To ensure support for the entire H-D range listed, remember to update WinPV, PV Firmware, and the Tune PV Database through the Power Vision Update Client.