Does Power Commander V overwrites Harley stage 1 Map/ECM?
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Does Power Commander V overwrites Harley stage 1 Map/ECM?
I have a forty eight mod with V & H short shots, stage 1 SE air cleaner, dealer stage 1 download remap, and power commander V, my question is does PCV overwrites Harley’s stage 1 map ECM? I am getting different answers from Dynojet and Fuel Moto.
I am getting very low fuel mileage (between 26 – 31 MPG), Dynojet said because I am running two maps, so the fuel must be too rich, but Fuel Moto said the HD stage 1 map shouldn’t make significant changes and should not affect PCV map, should I flush the ECM to stock map and run only map from PCV.
I am getting very low fuel mileage (between 26 – 31 MPG), Dynojet said because I am running two maps, so the fuel must be too rich, but Fuel Moto said the HD stage 1 map shouldn’t make significant changes and should not affect PCV map, should I flush the ECM to stock map and run only map from PCV.
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I had the stage 1 put on my 48 when I bought it and now have the PCV on it. The PCV will over ride all the other maps in the ecm. I did end up taking mine to a dyno shop to get it totally re-programmed and tuned and it runs way better now plus I gained 7Hp out of it. Gas mileage did go down with all my mods and tuning though.
#6
I had the stage 1 put on my 48 when I bought it and now have the PCV on it. The PCV will over ride all the other maps in the ecm. I did end up taking mine to a dyno shop to get it totally re-programmed and tuned and it runs way better now plus I gained 7Hp out of it. Gas mileage did go down with all my mods and tuning though.
So both companies could be correct. IIRC the Stage 1 download from Harley doesn't do much to fueling. However, such poor gas milage usually is caused by running too rich and if you're running off a canned tune on your PCV, which is designed to run on a stock ECM and thus adds fuel, you could have an issue if the Stage 1 download DID richen the mixture since you now have the PCV richening up an already rich mixture.
I'd suggest either getting some dyno time and having their tuner adjust your PCV, reflash the ECM with the stock tune, or remove the PCV and just run on the Stage 1 ECM.
Last edited by Robotech; 04-12-2012 at 05:54 PM.
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#8
This is true. The PCV will OVER-RIDE, but not over-write, the maps in the ECM. To the OP, remember that the PCV does not write anything to the ECM...all it does is take the commands from the ECM, modify them, then send them off to the Fuel and Ignition systems then takes the readings from the bikes sensors, modify some of them, and return that information to the ECM.
So both companies could be correct. IIRC the Stage 1 download from Harley doesn't do much to fueling. However, such poor gas milage usually is caused by running too rich and if you're running off a canned tune on your PCV, which is designed to run on a stock ECM and thus adds fuel, you could have an issue if the Stage 1 download DID richen the mixture since you now have the PCV richening up an already rich mixture.
I'd suggest either getting some dyno time and having their tuner adjust your PCV, reflash the ECM with the stock tune, or remove the PCV and just run on the Stage 1 ECM.
So both companies could be correct. IIRC the Stage 1 download from Harley doesn't do much to fueling. However, such poor gas milage usually is caused by running too rich and if you're running off a canned tune on your PCV, which is designed to run on a stock ECM and thus adds fuel, you could have an issue if the Stage 1 download DID richen the mixture since you now have the PCV richening up an already rich mixture.
I'd suggest either getting some dyno time and having their tuner adjust your PCV, reflash the ECM with the stock tune, or remove the PCV and just run on the Stage 1 ECM.
#9
This is true. The PCV will OVER-RIDE, but not over-write, the maps in the ECM. To the OP, remember that the PCV does not write anything to the ECM...all it does is take the commands from the ECM, modify them, then send them off to the Fuel and Ignition systems then takes the readings from the bikes sensors, modify some of them, and return that information to the ECM.
So both companies could be correct. IIRC the Stage 1 download from Harley doesn't do much to fueling. However, such poor gas milage usually is caused by running too rich and if you're running off a canned tune on your PCV, which is designed to run on a stock ECM and thus adds fuel, you could have an issue if the Stage 1 download DID richen the mixture since you now have the PCV richening up an already rich mixture.
I'd suggest either getting some dyno time and having their tuner adjust your PCV, reflash the ECM with the stock tune, or remove the PCV and just run on the Stage 1 ECM.
So both companies could be correct. IIRC the Stage 1 download from Harley doesn't do much to fueling. However, such poor gas milage usually is caused by running too rich and if you're running off a canned tune on your PCV, which is designed to run on a stock ECM and thus adds fuel, you could have an issue if the Stage 1 download DID richen the mixture since you now have the PCV richening up an already rich mixture.
I'd suggest either getting some dyno time and having their tuner adjust your PCV, reflash the ECM with the stock tune, or remove the PCV and just run on the Stage 1 ECM.
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