thats exactly the issue it’s right on the edge. They are way over clocked which is causing some issues. He said the pcv will make it much better. I don’t understand why but he gave me the pcv s said he’s only seen it one other time and it was on a 139ci m8. Once he added the pcv it was much better gas mileage, throttle response and ride ability.

 

I will say this, if he is telling you the PCV shows 250rpm increments and the Power Vision does not, he is wrong. Never heard of somebody needing a Power Commander to fix a tuning issue over a Vision. But there are a lot smarter tuners on this board than I. I'd ask/post in the touring section or the engine section if I were you.

 

Thanks for the input guys it gives me some ammo over just blindly following what he says. Would be more of an issue to me if I was paying for the tuner and another dyno session. Or if the bike didn’t make good power but it did just seems to be having trouble everywhere else lol.

 

As a tuner I have run across several bikes over the years that didn’t seem to tune properly using a closed loop flash system and tuning the bike in open loop (ie: power commander) seemed to help or “cover up” running issues.
That said, what I’ve found is it is better to figure what the closed loop tuning problem is/are and correcting it/them and the bike tuned as it should.
Bob

 

Yes! What he said! To add to that, my experience has been that the exhaust is the most common component to cause tuning issues. There may be other causes but exhaust is #1 IMO. YMMV.

 

If you are maxing the 5.5 SE injectors I would contact Frank at Dragos. He can make you a custom set of bigger injectors. They're not much more than what the SE's cost.

 

Tune resolution? Let us really take a look at that. With the Delphi system and VE tables. Resolution is more than just the columns and rows. The system takes just not what cell you are in but looks at several before coming to a conclusion on PW. The PC does not do this but the underlying calibration still does. Besides, there is more columns and rows with a flash based tuner over the PC5. Add in the tables such as CDE or EGR to flatten out the tables and the margin of error goes down even less.

I will say I have piggy backed on top of my flash based tunes but only for controlling power adders.

 

talked w him this weekend and that’s exactly what he had to say about it. Was going to use it as a tool to really tweak. Not as the main tuning device or to hide anything. The issue I was having was more about him not spending enough time on before I took the bike home. I should have just let him finish what he wanted to do before I freaked out but hey I runs great now

 

To be clear. Power adders are boost or NOS. I would never think about fine tuning on top of a flash based with a piggy back. No reason too. Flash based tuners give you so many more options and tools. Piggy backs are relying on what that flash based cal is.

 

i caught what u were saying. I did not let him put it on. And he said it probably wasn’t needed.