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post #1 of 11 (permalink) Old 06-13-2012, 10:11 PM Thread Starter
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Default Tuning/mapping question

This is my first FI motorcycle, 04 TC it runs great has plenty of power nice and smooth. It has enough power that I would give some of it up for better mpg. Can these bikes be tuned for fuel efficiency?

I don't fully understand "mapping" If I took my bike to the dealership I wouldn't even know what to ask for lol. Is mapping the same thing as tuning? Can it be fine tuned with out a fuel tuner?

When I bought the bike it had a Big Shot fuel tuner on it and I was getting 25 mpg I fooled around with it for about a week the best I could get was 35 mpg. I removed it and I'm getting 38 to 40 mpg now.
I can live with that but if it's possible to increase it even 5 mpg by having it remapped or tuned I'd do it even if it cost me some power, as long as it's not harmful to the engine.

As far as I know its completely stock the exhaust is pretty quiet I really don't know why it had the Big Shot installed. Thanks for any advice.

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post #2 of 11 (permalink) Old 06-14-2012, 03:43 AM
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Welcome to the very confusing world of fuel injection tuning. I have a lot of old school type friends who still struggle with some of the concepts, but I'll try to give you some overview of what it's all about.

As you may know, fuel injection is a computer driven process as compared to the mechanical process used in carburation. Instead of jets of varyious sizes that control the amount of fuel, a computer determines the amount of fuel by controlling the duration of the feed during the combustion process. Ultimately in fuel injection tuning you're trying to achieve an efficient and effective air to fuel ratio. In a well tuned bike this fuel ratio isn't constant throughout the RPM settings. It's typically leaner (less gas, more air) at lower RPM's and richer (more gas, less air) as RPM's increase. Lean settings can give you better fuel efficiency (and in a lot of cases better responsiveness) at the cost of higher temperatures with the opposite being the case with richer settings. A "map" is simply a table of values that defines how much fuel to feed for a given RPM and throttle setting.

With a fuel injection tuner you can easily change this map to suit your needs versus having to go to the dealer and have the ECU flashed. By and large injection tuning isn't about creating more overall horsepower as much as it is optimizing the power (responsiveness) for any given throttle/horsepower setting while balancing it against the heat produced by the combustion process and the mileage. Although it seems counter-intuitive, a richer setting actually makes the engine run cooler and that's why, in most maps, you'll see leaner settings at low rpm/throttle and richer settings as the rpm/throttle increases.

Those are the main concepts behind it all and the implementation of how it's done varies with different manufacturers of these injection tuners. The differences tend to be about how much precision and control you want over the tuning process. Products like Power Commander allow you to individually tweak almost every aspect while others like Cobra do it all for you automatically through some pre-determined logic, with other products allowing varying levels of control and automation.

I'd tell you more, but i can see your eyes are glazing over at this point just like some of my old school buddies...good luck..

2012 Victory High Ball
Victory Stage 1 swept pipes and performance air filter
PCV and Autotune

Last edited by DunedinDragon; 06-14-2012 at 03:46 AM.
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post #3 of 11 (permalink) Old 06-14-2012, 05:54 AM
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38-40MPG out of a TC is excellent. Only way you are going to improve on that is with your right hand

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post #4 of 11 (permalink) Old 06-14-2012, 08:56 AM
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Welcome to the world of big engines. I felt the same way when I went from 750cc Honda shadow to 1500cc victory Vegas.
But not any more, you'll get used to it.

2003 Victory vegas
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post #5 of 11 (permalink) Old 06-14-2012, 09:51 AM Thread Starter
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Ok thanks like I said if that mpg is about right then good, I guess I'm just the opposite of the guy who wants to get 5 more horse power.

Captain Spalding's Fried chicken and gasoline. * EXIT 13 OFF ROUT 1 at RUGGSVILLE*

2004 TC, 05 Vegas 8Ball, 09 Yamaha FZ6R
Lake Havasu City AZ.
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post #6 of 11 (permalink) Old 06-15-2012, 05:55 PM
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While y'all are giving opinions..... I had them put exhaust on my white Cross Country Tour. It is about equal to, maybe a little louder than stage one.They said it didn't really have to be mapped because of all the automatic sensors.
Runs very well and mileage is around 37-40 depending on me.
The only thing that bothers me is it is rich and the pipes are really black, AND I have the very noticeable black spray on the back of the fender and saddlebags.
Any thoughts? It is not too hard to wipe down, and I bought it to ride, so it gets dirty. Just wondering if I need to follow up on anything.

Thank You

2012 Pearl White Cross Country Tour

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post #7 of 11 (permalink) Old 06-15-2012, 06:15 PM Thread Starter
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dprevette this is a quote from another thread https://www.victoryforums.com/showthr...t=11891&page=2

Quote:
Originally Posted by Buster View Post
Hi, I have an 08 Vision and use to run 91, I now run a lower octane. I would get black soot on the pipes, I took it to the dealer and everything checks out OK. People did not want to ride behind me because of the fumes and unburnt gas coming out. I was reading on this forum that had information on high octane and black soot on the pipes. I beleive Kevin said it, 91 burns slower and can send unburned fuel out the exhaust. I changed to a lower octane fuel to try it out, and got an increse in milage (3 to 5 depending on the thottle) and my pipes are now a gray color.
So if it does not knock you can use it.
I have level 1 pipes, LLoydz secondary air intake and IAV.

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2004 TC, 05 Vegas 8Ball, 09 Yamaha FZ6R
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post #8 of 11 (permalink) Old 06-15-2012, 09:27 PM
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Quote:
Originally Posted by dprevette View Post
While y'all are giving opinions..... I had them put exhaust on my white Cross Country Tour. It is about equal to, maybe a little louder than stage one.They said it didn't really have to be mapped because of all the automatic sensors.
Runs very well and mileage is around 37-40 depending on me.
The only thing that bothers me is it is rich and the pipes are really black, AND I have the very noticeable black spray on the back of the fender and saddlebags.
Any thoughts? It is not too hard to wipe down, and I bought it to ride, so it gets dirty. Just wondering if I need to follow up on anything.

Thank You
What pipes exactly did they put on for you without flashing the ECM or installing some kind of fuel controller? Did they simply disconnect the O2 sensors and leave it at that?

The black soot isn't something to be worried about per se because the bike goes into an enrichment mode for a certain amount of time or until the heads get to a certain temp. KevX could tell you exactly. Anyway; this causes that soot in the tail pipes. It's how it runs and what kind of mileage you are getting that I want to know.
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post #9 of 11 (permalink) Old 06-16-2012, 04:27 AM
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Quote:
Originally Posted by dprevette View Post
While y'all are giving opinions..... I had them put exhaust on my white Cross Country Tour. It is about equal to, maybe a little louder than stage one.They said it didn't really have to be mapped because of all the automatic sensors.
Runs very well and mileage is around 37-40 depending on me.
The only thing that bothers me is it is rich and the pipes are really black, AND I have the very noticeable black spray on the back of the fender and saddlebags.
Any thoughts? It is not too hard to wipe down, and I bought it to ride, so it gets dirty. Just wondering if I need to follow up on anything.

Thank You
The cats are gone that would have burned up the unburnt fuel. It is really not running rich. When you gun it some of the fuel is blown through the cylinder with out getting flamed. Fuel is from oil so that is why it is black. You could put the cats back in..

2012 Fireball Jackpot
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post #10 of 11 (permalink) Old 06-16-2012, 05:47 AM
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Quote:
Originally Posted by gibson View Post
The cats are gone that would have burned up the unburnt fuel. It is really not running rich. When you gun it some of the fuel is blown through the cylinder with out getting flamed. Fuel is from oil so that is why it is black. You could put the cats back in..
Does not say in his post that cats are gone, and cats do NOT burn fuel. As the name suggests. A catalytic converter uses a catalyst strata to convert some of the gass into a more harmless form, but a rich engine is rich with oro without them.
That said these things are basically air cooled and need a rich mixture to properly cool. So a little rich is just right

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