Today is the day...PCV and Auto Tune - Victory Forums - Victory Motorcycle Forum
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post #1 of 33 (permalink) Old 01-18-2012, 04:29 AM Thread Starter
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Default Today is the day...PCV and Auto Tune

My Power Commander V and Auto Tune came in yesterday and I'm picking it up today. Having looked through what little documentation is available I have a question for anyone that has this installed as far as how you actually use it.

Apparently the Auto Tune and PCV are set to the pre-configured map for my bike's configuration (2011 106 CI/Performance pipes and air filter). As best as I can understand it, the Auto Tune will collect trim table info as I ride that's being used to keep the bike at the target AFR's specified. When you select 'Accept All Trims' from the Map Tools menu, it transfers the trim map entries to the PCV and zero's out the Auto Tune trim entries. The idea here being that the trim's you collect after that will get smaller and smaller as you progressively dial-in the bike.

It seems there are two schools of thought on this. Some say just leave it alone and let the Auto Tune keep the bike in tune rather than accepting the trims. For those that have this system installed, how do you do this? Do you leave the Auto Tune trims alone and just let it keep adjusting on the fly, or do you accept/zero the trims and transfer them to the PCV to progressively dial in the PCV map? What are the advantages/disadvantages?

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PCV and Autotune

Last edited by DunedinDragon; 01-18-2012 at 04:32 AM.
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post #2 of 33 (permalink) Old 01-18-2012, 08:06 AM
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Quote:
Originally Posted by DunedinDragon View Post
My Power Commander V and Auto Tune came in yesterday and I'm picking it up today. Having looked through what little documentation is available I have a question for anyone that has this installed as far as how you actually use it.

Apparently the Auto Tune and PCV are set to the pre-configured map for my bike's configuration (2011 106 CI/Performance pipes and air filter). As best as I can understand it, the Auto Tune will collect trim table info as I ride that's being used to keep the bike at the target AFR's specified. When you select 'Accept All Trims' from the Map Tools menu, it transfers the trim map entries to the PCV and zero's out the Auto Tune trim entries. The idea here being that the trim's you collect after that will get smaller and smaller as you progressively dial-in the bike.

It seems there are two schools of thought on this. Some say just leave it alone and let the Auto Tune keep the bike in tune rather than accepting the trims. For those that have this system installed, how do you do this? Do you leave the Auto Tune trims alone and just let it keep adjusting on the fly, or do you accept/zero the trims and transfer them to the PCV to progressively dial in the PCV map? What are the advantages/disadvantages?
I think you got the two schools of thought a little combined. The premise is to go ahead and accept trims, but then once you get it pretty refined, remove the AT unit (and wide band o2 sensors) altogether. I believe the thought process is that it preserves the sensors longer, and at this point, you just have the fixed fuel map that was derived from the Auto Tune. Personally, I don't see any benefit. Leave the AT hooked up, but still accept the trims periodically. The Auto Tune will still constantly be keeping the AFRs where you want them on the fly (but theoretically, the variances won't be as large)... If you think about it, this is what every modern automobile on the road does, and you don't see anyone disconnecting those sensors to preserve their lifespan.

2011 Silver/black Vision, Ness Big Honkers, Ness Twin Sucker, PC-V w/AT, Lloydz VM1-DR cams, Lloydz Adj Intake, Lloydz Variable Timing Wheel.

2006 110" (133hp/142tq) +nitrous Kingpin (sold)

Last edited by Gunslinger; 01-18-2012 at 08:10 AM.
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post #3 of 33 (permalink) Old 01-18-2012, 09:01 AM
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"increasing lifespan" notwithstanding, you don't have to remove the AT unit and sensors to turn it off. You can globally or even selectively turn off autotune by simply putting in a zero AFR map into the unit. That is, the AT software sees 0's as a signal to skip over those cells and not autotune there at all.

You have the right idea with ride, accept trims, ride. Once refined, your options are to disable autotune like above, or to reduce the enrichment/enleanment limits. I recommend the latter because you can reduce hunting (which honestly is not a big problem on these units once you are zeroed in), while allowing for some variation in environmental factors. The thing to note is if you have anrich/leanment limits of say +/-5, and you see values of +/-5 in your trim map, you should either accept the trim and retune, or widen your limits because you may be out of tune in those cells since the software is maxed out.

Finally, autotune works well in cells that can be easily reached in a steady state. 0% throttle at anything above idle, for example is not a column you want to turn on autotune for- it will just be wrong and can cause major popping. in fact, most maps I've seen have a zero AFR in the 0% column for this very reason.

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post #4 of 33 (permalink) Old 01-18-2012, 09:37 AM
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Originally Posted by ashmostro View Post
"increasing lifespan" notwithstanding, you don't have to remove the AT unit and sensors to turn it off. You can globally or even selectively turn off autotune by simply putting in a zero AFR map into the unit. That is, the AT software sees 0's as a signal to skip over those cells and not autotune there at all.
In the DynoJet software there is an option to enable or disable the AutoTune, one check in the block and done much easier than zeroing out a column in the fuel table.

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post #5 of 33 (permalink) Old 01-18-2012, 09:50 AM
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In the DynoJet software there is an option to enable or disable the AutoTune, one check in the block and done much easier than zeroing out a column in the fuel table.
True, but there is no reason to do this, other than for the hope of preserving the sensors. However, the only way to do that, is to get them out of the exhaust stream. But, if this is so critical, why don't cars have issues with sensor longevity?

Also, the maps that are supplied for our bikes are typically crazy rich, especially if you get the unit from FuelMoto. You can easily subtract about 2-5 10ths from whatever they have as AFR values....

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post #6 of 33 (permalink) Old 01-18-2012, 09:58 AM
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I'm still kinda new to this, but I'm thinking one of the advantages to something like an autotune would be to have it adjust real time for things like altitude (air density) and temperature on the fly. Thus it would seem the best method would be to allow the unit to operate constantly...or do I have my head up my?
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post #7 of 33 (permalink) Old 01-18-2012, 10:03 AM
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I'm still kinda new to this, but I'm thinking one of the advantages to something like an autotune would be to have it adjust real time for things like altitude (air density) and temperature on the fly. Thus it would seem the best method would be to allow the unit to operate constantly...or do I have my head up my?
That's why I leave mine functioning all the time.

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post #8 of 33 (permalink) Old 01-18-2012, 10:21 AM
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That's why I leave mine functioning all the time.
Thanks. Just wanted to make sure I understood.
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post #9 of 33 (permalink) Old 01-18-2012, 10:55 AM
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Quote:
Originally Posted by depot picker View Post
I'm still kinda new to this, but I'm thinking one of the advantages to something like an autotune would be to have it adjust real time for things like altitude (air density) and temperature on the fly. Thus it would seem the best method would be to allow the unit to operate constantly...or do I have my head up my?
Yep. That's the idea. But, the option is there to selectively enable or disable if you want, for whatever reason you may have. Testing, or drag runs, for example (wouldn't be hard to comw up with many more).

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post #10 of 33 (permalink) Old 01-18-2012, 11:08 AM
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Disabling the AT also gives you the option to control the toggle option, giving you access to select from two different fuel maps on the fly. With the AT enabled, the toggle inputs are driven to the base map or learn mode for the AT.

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Lloydz LSC Cams
Lloydz Air Filter
Lloydz Turn Throttle Ring
Fuel Tank Lift
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Forged Highway Bars
RC Components RCX Exhaust
National Cycle 8.25in Windscreen
FMB Choppers Phat Apes
Arlen Ness Slash-Cut Grips
Kurakyn Bahn Mirrors

2016 Hammer "S"
-INWORK-
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U/D Front Pulley
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