Power Commander V

[Heidhurtin]

Guys - genuine question, be gentle. 2012 Roadster. I'm trying to sort a "firing on 2" issue, and it's the first time I've had to remove the side cover. Imagine my surprise to find this....

So, given I have Jardines fitted but OEM intakes, what good is the Power Commander V? I'm a noob at the tuning thing but does this negate any maps I flash using TuneECU? I'm not chasing any power gains but would like the bike to run a little richer (cooler).
Any pointers to explanations in plain english would be appreciated.....

.

 

[Kevin frazier]

I just bought one myself with this settup. Ive never run either but have seen them (pcv auto tune) fail. The auto tune seems to try to get fuel right but struggles compared to what i normally do and thats dyno tune. I will be deleting auto tune next week as we hit the dyno to dial in. Youre firing on 2 issue could be the coil getting hot and failing, if hot has nothing to do with it a plug wire could be jumping arc, the spade connectors could be loose, tighten with pliers, and check plugs. Autotune and pcv may not be your issue like i said i think auto tune trys to keep fueling right not necessarily causing misfire, mine back fires alot right now but its 250hp and a very angry engine. Others will chime in and sort you out.

 

[atomsplitter]

You should be able to download a manual to set the Dynojet stuff up. If all else fails read the manual: DYNOJET POWER COMMANDER V INSTALLATION INSTRUCTIONS MANUAL Pdf Download

 

[Heidhurtin]

Thanks Kevin. I didn't think the PCV was responsible for the missing cyl, I was just curious as to what good it does on an unmodified (Jardines) bike? It's an expensive addition, and unless there's more going on in this bike than I know, a bit of a waste. I've had the plugs out and it is running a little rich, which is what I want, and I've no idea how to use/modify or even remove PCV.

Now, onto the misfire, which is REALLY odd.

 

[Heidhurtin]

Thanks Atomsplitter, there's a manual for setting up the unit specific to the Rocket, but the PCV's already installed on the bike. My question is, now that I know the PCV is there, changing the map using Tuneecu would be pointless (and a lot of wasted effort already), correct? I also don't see the benefit in the PCV for my particular bike.

 

[Bunny Burrell]

Once you’ve sorted the miss fire, get yourself a quality airfilter set up. It’ll get more air in.

 

[leatal]

Thanks Atomsplitter, there's a manual for setting up the unit specific to the Rocket, but the PCV's already installed on the bike. My question is, now that I know the PCV is there, changing the map using Tuneecu would be pointless (and a lot of wasted effort already), correct? I also don't see the benefit in the PCV for my particular bike.

You should zero all adjustments in the PC5 if you are using a new tune. You can still use the PC5 with autotune. Make sure O2 sensor is turned off, set your fuel/air ratio to say 13.2, and let the autotune maintain the correct ratio while driving. You never have to accept PC5 recommended changes, just let autotune make continuous adjustments. You can also also accept the PC5 recommended adjustments by following dynojet's procedures for tuning.

 

[Heidhurtin]

Thanks Leatal - but my question in basic terms is; if I load a new tune into the ECU using Tuneecu (which I have tried) will it have any effect, or will the PCV always override it and do its own thing? I'll read up on using the PCV, but initial impressions are it's a bit too advanced for me - I can just about get my head round Tuneecu.

I'm also a bit confused around why anybody would install the PCV on a stock bike with only Jardines fitted.

 

[leatal]

Thanks Leatal - but my question in basic terms is; if I load a new tune into the ECU using Tuneecu (which I have tried) will it have any effect, or will the PCV always override it and do its own thing? I'll read up on using the PCV, but initial impressions are it's a bit too advanced for me - I can just about get my head round Tuneecu.

I'm also a bit confused around why anybody would install the PCV on a stock bike with only Jardines fitted.

If the PC5 has any saved adjustments on it's base map, it will apply those adjustments regardless of the tune in the ecu. The PC5 does not read the fuel being sent by the ecu, it only knows what to add/subtract from it's base map. If you add a new map to the ECU and don't erase the numbers stored on the PC5 base map, the fueling will be way off. Now, if the autotune is active, it will adjust the fuel given to the injectors by the PC5 map. So yes, the PC5 will over ride the tune in the ecu. As far as adding a PC5 and autotune to a stock bike with Jardines, it will allow for more precise fueling (provided it is set up and adjusted properly).

 

[Heidhurtin]

If the PC5 has any saved adjustments on it's base map, it will apply those adjustments regardless of the tune in the ecu. The PC5 does not read the fuel being sent by the ecu, it only knows what to add/subtract from it's base map. If you add a new map to the ECU and don't erase the numbers stored on the PC5 base map, the fueling will be way off. Now, if the autotune is active, it will adjust the fuel given to the injectors by the PC5 map. So yes, the PC5 will over ride the tune in the ecu. As far as adding a PC5 and autotune to a stock bike with Jardines, it will allow for more precise fueling (provided it is set up and adjusted properly).

Thanks. Forgive my simpleton brain - the PCV (or PC5) adds or subtracts to/from the values in the ECU map, but doesn't hold the base values itself. Correct?
So changing the ECU map could, as you say, give some really odd behaviour without also changing the PCV additions/subtractions. So, after changing an ECU map, I'd need to run autotune to update the PCV?

Sorry but I still fail to see the advantages of the PC5 for a near-stock bike. It seems like an expensive fit for little gain. To be clear, I'm not trying to get somebody to justify it, I'm just curious and appreciate people's time educating me.