Auto Tune, how does it work ?
6th Gear
Joined: Jul 2014
Posts: 13
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From: Ny
I really don't know that much about efi tuning but my bike had a lot of deceleration pop and it was annoying so I went for the power vision and the target tune. I got it from fuel Moto they were great the map they installed got rid of 95% of the popping so I'm hoping that when I auto tune I can get rid of the rest.
Seasoned HDF Member
Joined: Jan 2011
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From: Michigan 15 Minutes East Of Hell
Tourer
Joined: Jun 2013
Posts: 321
Likes: 10
From: Oklahoma
Excellent thread gentlemen. Just got a power vision myself, great info.
I had a stage I downloaded by the stealer with my a/c install so the bike was already running better. Installed some different slip ons recently and had some decel pop. Loaded the tune suggested by Roy @ dynojet and its running better but want to go through the auto tune process when the weather clears.
What is the best way to fill as many cells as possible during the AT sessions?
I had a stage I downloaded by the stealer with my a/c install so the bike was already running better. Installed some different slip ons recently and had some decel pop. Loaded the tune suggested by Roy @ dynojet and its running better but want to go through the auto tune process when the weather clears.
What is the best way to fill as many cells as possible during the AT sessions?
Extreme HDF Member
Joined: Aug 2013
Posts: 16,271
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From: Somewhere SW
The VEs are basically set, they are the foundation for your tune.
When operating in closed loop (14.2-15.0) the ECU gets feedback from the 02 sensors to make sure that the right amount of fuel is delivered to a cell that is in closed loop.
Parts of your tune will not be in closed loop, when you get a canned map a good percentage of the tune will be in open loop.
In open loop the ECU uses the VE settings to calculate the correct amount fuel for those open loop cells.
If one or both of your 02 sensors were to fail the ECU will automatically fallback on the VEs to set the correct fuel in those areas where the ECU was once getting feedback.
The VEs also set a beginning reference point where the tune will start.
The VEs are also used when engine is cold and the 02 sensors haven't reached operating temperature.
Keep in mind that the tuner is used to create the map, the map is a set instructions which are carried out by the ECU. The ECU doesn't really change anything on the map (though there is a slight rounding of numbers that have been know to take place during the flashing process).
Last edited by JustDave13; Nov 27, 2015 at 01:48 PM.
Thread Starter
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Cruiser
Joined: Aug 2015
Posts: 113
Likes: 4
From: Dartmouth, Devon, UK
It must do in closed loop ? Otherwise what closes the loop ?
But all my questions still stand :
But all my questions still stand :
Extreme HDF Member
Joined: Aug 2013
Posts: 16,271
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From: Somewhere SW
Open loop is when the set afrs are out of the range of the 02 sensors (an example would be 13.8).
What closes the loop would be the settings on the map.
Maybe you missed this.
What it simply does is add or take away fuel until it reaches the desired 14.7, then using injector pulse time the software calculates how much air your engine is passing at that given moment. (this is why you want to hit as many cells as possible)
This is how it figures the VE ratios (how much your engine breathes) which are the most important numbers for setting up an accurate tune.
Without accurate VE numbers as a foundation your tune will be off.
This is how it figures the VE ratios (how much your engine breathes) which are the most important numbers for setting up an accurate tune.
Without accurate VE numbers as a foundation your tune will be off.
Last edited by JustDave13; Nov 27, 2015 at 05:50 PM.
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Road Master
Joined: Mar 2007
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Thread Starter
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Cruiser
Joined: Aug 2015
Posts: 113
Likes: 4
From: Dartmouth, Devon, UK
Thanks guys.
In which case, what is the Auto Tune sensor/measuring to set VE if the O2 sensors are out range?
I'm still looking for my answers. I am a skilled electronic design engineer, that's why I really want to know.
Any more input welcome. BTW I never trust Google, only acknowledged experts in their field.
I'm still looking for my answers. I am a skilled electronic design engineer, that's why I really want to know.
Any more input welcome. BTW I never trust Google, only acknowledged experts in their field.
Last edited by Dave Cawley; Nov 28, 2015 at 04:53 AM.