Author Topic: PCV Autotune trick  (Read 6378 times)

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Offline Fred_Harmon_TX

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PCV Autotune trick
« on: April 26, 2012, 06:52:26 pm »
I just learned a new trick you can do with the PCV and Autotune system.

If you hook up a map switch to the PCV, you can configure the switch through the software to turn the Autotune function on and off on the fly. I've known about this feature for some time, but what I didn't know was that since the Autotuner only makes fuel trims when it is turned on, it also only uses those trim outputs and applies them to the base map when the Autotune function is active. If the Autotune function is turned off, whatever is in the trim files is basically ignored and your running off the base map only.

So you can load a zero map in the fuel tables, and then ride with the Autotune on and let it build trim files for you, and as soon as you turn the switch off, the PCV reverts back to using the zero map. As long as you never apply the trims to the base map, you can always have a zero map (or whatever base map you want) available. And if you want to take advantage of the autotuner and use the trim files, all you have to do is flip the switch to turn the Autotuner on.

I've verified this works by loading some real high values in at idle speed into the trim files but left the base map at zero, and sure enough, when I flip the Autotune switch on and off, you can hear the idle change. I also spoke to a rep at DynoJet, and he said this does indeed work and that the trim files are ignored when the Autotune is shut off.

What this does, is allow you to have both a static and a dynamic map loaded on the bike at the same time that you can switch back and forth between on the fly.

If you don't have an autotune system, you can also hook up a switch to the PCV and load two seperate maps that you can then toggle back and forth between.
« Last Edit: April 26, 2012, 07:13:07 pm by Fred_Harmon_TX »
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Offline Dolittle

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Re: PCV Autotune trick
« Reply #1 on: April 26, 2012, 08:33:48 pm »
I had the lap top hooked up to my 08 and i cleared the trim files. Before i rode the bike if throttled up seting still it would miss but after i took it for a ride it ran better, does the auto tune make a map all the time it is on ?
Rich 8)
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Offline Jeremy

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Re: PCV Autotune trick
« Reply #2 on: April 26, 2012, 09:02:17 pm »
I have been doing this since January and I really like having the option of two maps.  Would you be will to email me the two maps that you are running?  I am trying to build my collection of maps up, to find the happy medium between fuel mileage and power. 
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Offline Fred_Harmon_TX

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Re: PCV Autotune trick
« Reply #3 on: April 26, 2012, 09:36:56 pm »
I had the lap top hooked up to my 08 and i cleared the trim files. Before i rode the bike if throttled up seting still it would miss but after i took it for a ride it ran better, does the auto tune make a map all the time it is on ?
Rich 8)

Yes, anytime the Autotuner is on, it is making adjustments to the trim files, and the trim files are being applied to the base map.

I have been doing this since January and I really like having the option of two maps.  Would you be will to email me the two maps that you are running?  I am trying to build my collection of maps up, to find the happy medium between fuel mileage and power.

My maps won't apply to your bike, because my ECU has been reflashed and the base fuel maps in the ECU were altered. I've got a bit of a hybrid set up that utilizes both the Guhl Reflash and the PCV with Autotune.
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Offline Russ

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Re: PCV Autotune trick
« Reply #4 on: April 26, 2012, 10:26:51 pm »
I had the lap top hooked up to my 08 and i cleared the trim files. Before i rode the bike if throttled up seting still it would miss but after i took it for a ride it ran better, does the auto tune make a map all the time it is on ?
Rich 8)


A Power Commander 5 will work on an '08?

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Offline Jeremy

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Re: PCV Autotune trick
« Reply #5 on: April 27, 2012, 12:09:41 am »

A Power Commander 5 will work on an '08?


Yes it will.  The 2008 is listed to take the PCIII so that Dynajet could clear out the old stock.  I have had a PCV  on my 2008 for almost two years now and it runs great (installed the AutoTune this past winter).
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Offline rcannon409

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Re: PCV Autotune trick
« Reply #6 on: April 27, 2012, 01:23:08 pm »
Russ, as Jeremy said, yes it will. Mine was marked 2009 on the box it came in and was for an 08.  That was from Fuel Moto
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Offline Bud

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Re: PCV Autotune trick
« Reply #7 on: April 27, 2012, 06:01:20 pm »
I just learned a new trick you can do with the PCV and Autotune system.

If you hook up a map switch to the PCV, you can configure the switch through the software to turn the Autotune function on and off on the fly. I've known about this feature for some time, but what I didn't know was that since the Autotuner only makes fuel trims when it is turned on, it also only uses those trim outputs and applies them to the base map when the Autotune function is active. If the Autotune function is turned off, whatever is in the trim files is basically ignored and your running off the base map only.

So you can load a zero map in the fuel tables, and then ride with the Autotune on and let it build trim files for you, and as soon as you turn the switch off, the PCV reverts back to using the zero map. As long as you never apply the trims to the base map, you can always have a zero map (or whatever base map you want) available. And if you want to take advantage of the autotuner and use the trim files, all you have to do is flip the switch to turn the Autotuner on.

I've verified this works by loading some real high values in at idle speed into the trim files but left the base map at zero, and sure enough, when I flip the Autotune switch on and off, you can hear the idle change. I also spoke to a rep at DynoJet, and he said this does indeed work and that the trim files are ignored when the Autotune is shut off.

What this does, is allow you to have both a static and a dynamic map loaded on the bike at the same time that you can switch back and forth between on the fly.

If you don't have an autotune system, you can also hook up a switch to the PCV and load two seperate maps that you can then toggle back and forth between.

This is not a new trick Fred.  I've been using my '09 with the PCV, Autotune and a toggle switch this way for three years.