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Discussion Starter #1 (Edited)
Does the Dynojet Autotune Pro (the piggyback with widebands) allow the Harley ECM to run in Closed loop mode with lower AFRs?

Trying to decide if I want to buy the widebands or just take the bike to a dyno guy. I've read some semi conflicting information. Seems kinda lame if the AT pro is only useful during Tuning sessions and none of the added function is available in day to day riding. <deleted a significant mis-perception on my part lol >

Really would like to see the AT Pro O2 sensors be useful for more than just data logging/autotune.

Anyone who's got the AT pro unit using it and really happy they went that route?

Thanks!
 

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The AT is active on the piggy-back tuners by Dyno-Jet like the PC-V. The 'flash' tuner(s) such as PV only use the wideband when in autotune-pro mode. The map is then saved and flashed to the ECM.
 

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Discussion Starter #3
Hmmm. I understand while Autotuning it would be logging to the PV, just like Basic. But it seems as if it would actually have the ability to pass signals directly to the ECM.

I just looked at a picture of the AT-110 and see that it connects via the dataport. Crap. I really was thinking it piggy backed in line with the main harness connector like the PC-V.

Crap crap crap. Starting to wonder how the hell a Dyno operator can use the Power Vision to do a dyno tune... Thinking they can't tune with it anywhere as easily as with the PC-V.
 

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The dynojet piggy back units such as PC-v are quicker to tune because you can apply changes to fuel tables while the bike is running on the dyno. There is no need to shut down the engine because you are working with the signal created by the PC, not the ECM directly. All flash style tuners (tts, sert,sepst, direct link) need to be shut down and the altered map be applied. So the answer is yes it takes longer to tune the flash style units, how much longer depends on how close the starting map the operator has to your combination. As for the auto-tune pro on the Powervision, it allows you to set a/f that cannot accurately be obtained with narrow band (stock) O2 sensors. Any KPa ranges from 80 percent and above should be tuned with wideband sensors. The pro system does allow you to monitor a/f while riding and logging.
 

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so does it run in closed loop after u flash it or does it stay open loop? I have auto tune pro and it seems to work ok but I have nothing to compare it with so I really dont know for sure how it's "supposed" to feel......
 

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Discussion Starter #7
The pro system does allow you to monitor a/f while riding and logging.
Thanks for this confirmation mocotom. (I also confirmed this talking to a tuner last week)

I've decided to skip the AT Pro and put that coin toward a pro tune.

RenegadeSteve, Open or Closed loop depends on the AFR values used by the Map currently flashed to the ECM. The factory ECM is only able to use the narrow band O2 sensors which means it will only be able to operate in Closed loop when the target AFR is in the range of 14.2-15.1:1.

With PowerVision, the bike is always running exclusively off the map in your ECM which uses the narrow band O2's as much as it can. The ECM can't use the WB sensors at all, the AT Pro WB's are used only for logging purposes when using a PowerVision unit.

As faststan and mocotom said, if you have a PowerCommander V, you can use the AT Pro WB O2 sensors in real time because the factory O2 sensors aren't used at all, and the AT pro module is monitoring and altering your AFR

The relationship between the PV and ECM is more than a little confusing and it's taken me months to get this straight in my head... Especially when you are used to thinking in AFR vs Lambda... Most tuning information out in the interweb is around AFR, and understanding tuning with Lambda takes a different strategy.
 
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