I do not have any auxilary boost controller. Just the PFC.

In the Boost Menu there are two settings. For each setting there are settings for each turbo.

Setting one reads

.80 56%
.70 64%

Second setting reads

.90 forgot
.80 forgot


Now how do I set which one I want to use?

What does changing the duty cycle do?

From what I understand. I should first set my target boost and the higher the duty cycle the higher the boost. And if duty cycle is too high I will either spike or creep.

 

You just go into the boost setting and highlight either the first or second setting, then just back out and it will use that setting.

As for duty cycle, yes, you want to set your boost first, if higher, then increase the % duty by a small amount. The PFC will self adjust this number, but it will take it less time if the % duty you entered is closer to the value that the PFC will eventually use. I am not aware of any specific calculation or method to figure ou the duty, but if you increase the boost, increase the duty. You can guesstimate by looking at the differences in duty from the first to the second setting. Make sense?

As for the % duty, it is the percentage of open and closed cycles of the selenoids that control the wastegate spring to achieve your desired boost level.

You may get a slight boost spike, not necessarily boost creep, but I doubt it since it learns anyways.

 

I REALLY LIke the looks of that yellow fd above. nice job!

matt

 

Thanks Matty.

It was originally TristarX's car, another guy on this forum. He did all the work on it and I just bought it, and am now cleaning up a few things here and there.

As for the PFC boost.

at the setting of .70 and base duty of 56% (i lowered it) for the second turbo it's going as high as .84 (which I don't mind) But I'd like it to be consistent with what I set it at.

P.S. I have no cats.

 

sorry off subject again....but....what suspension work do u hvae done to the car....its lowered nicely.

 

Hey fellas, I'm wondering some of hte same things. I know you can turn down the boost by adjusting the duty cyle but I did that and now I'm having this huge boost/fuel cut problem in third gear around 6000 rpm. Any ideas? I know its the boost because my second map doesn't have this problem but I can't use it because its too cold out right now and I'm already running 96% Injector Duty Cycle (I know thats way too high, injectors are next up on the purchase list). Thanks

 

i think you answered your own question....you have no cats. My personal experience is that the PFC controls boost poorly when there is no restriction in flow. I mean for me, my boost is "close" to what i programed it at but not exact. Also i had to lower my duty cycle alot now that its colder out. in fact in this weather i try not to go WOT alot...its just alot harder to control now. This makes me wonder if i am going to be able to control boost next spring when i get an IC.
Also, are you hitting .84 for a second then levels off at .70?

 

Not so sure about the no cats part.
I'm getting pretty good boost control with the PFC, and I have no cats. No discernible spikes or creep. Having the wastegate ported is probably playing its part also.

Boost is under much better control now then when I was running with the PMC(?) the purple box.

 

To adjust the boost pressure you should adjust the duty cycles & boost pressure.

Lower duty for lower boost and higher duty for high boost.

The pressure setting in the boost menu is what the PFC tries to get the boost pressure up to by using the duty cycles, and it is used to base the fuel cut pressure, which will be .25 bar higher than what your max boost pressure is set to.

There is a "suggested" ratio to keep when modifying the duty cycles posted somewhere in the PFC Forum here, but I can't find it right now. It's based of the base ratio that the PFC comes with, so if you keep that then you should be ok.

 

Does the higher duty cycle bleed more boost? I'm confused as to what the % duty cycle of the wastegate control does? I have J-spec twins.