Addition to Smokem's AFC SIMPLIFIED thread. Now locked.

exciting conversation

I have considered the case of (2) springs, with slightly differing rates... or as someone has mentioned a progressive rate spring.
 
I currently run 2 springs in mine, TST (28 lb) and spring I found at the hardware store (~15lb). I'm also running a regulator on the reference line. It seemed to have good midrange and top end manners but like everyone else I wish it wouldnt budge until I had 8-10 psi. I've thought about running a solenoid valve on a Hobbes switch so it wouldn't see any boost until 10 psi.
 
Are you running an inside and outside spring or are they on top of each other? Probably inside/outside..

Is the inside spring's diameter small enough to where it stays on the afc control rod or do you have the springs separated somehow?
 
Inside spring is small enough it is on the rod, that way they don't interfere with one another and there isn't any bind.
 
That's what so hard is to have a stiff enough spring without coil bind. Atleast that what I run into with my springs
 
there has been for a awhile.. i think people just need to show a demand for it
 
i have a inner valve spring from a c15 i wanna try out, its a bit long but could be easily cut down
 
2 springs would be pretty easy as long as they are wound in opposite directions. My problem has always been needing a higher transition for low boost then let it dump after the turbo is lite. If my current setup doesn't pan out I think the boost elbow will be getting a try with a softer spring.
 
burnin oil said:
My problem has always been needing a higher transition for low boost then let it dump after the turbo is lite.
Click to expand...

BELL CRANK!!!!!!!

my perfect setup would revolve around a stepper motor, small PLC, and inputs from engine RPM, TPS, boost, etc.

that way one could have a chipped 12V!
 
copenglenn said:
I currently run 2 springs in mine, TST (28 lb) and spring I found at the hardware store (~15lb). I'm also running a regulator on the reference line. It seemed to have good midrange and top end manners but like everyone else I wish it wouldnt budge until I had 8-10 psi. I've thought about running a solenoid valve on a Hobbes switch so it wouldn't see any boost until 10 psi.
Click to expand...

Are you running an actual regulator, or just a valve with an orifice?
 
copenglenn said:
A regulator with a gauge so I know, relatively close, where the AFC foot is at a given psi. Let me see if I can find a pic.
Click to expand...

I think he's more concerned with the actual difference in equipment... regulator's going to 'cap' the peak boost pressure, where-as the bleed-off valve will allow pressure to constantly rise (probably other differences based on boost response & valve reaction)
 
Hurley said:
BELL CRANK!!!!!!!

my perfect setup would revolve around a stepper motor, small PLC, and inputs from engine RPM, TPS, boost, etc.

that way one could have a chipped 12V!
Click to expand...

That's exactly what I was thinking! Seems like such a good idea
 
Hurley said:
I think he's more concerned with the actual difference in equipment... regulator's going to 'cap' the peak boost pressure, where-as the bleed-off valve will allow pressure to constantly rise (probably other differences based on boost response & valve reaction)
Click to expand...

The boost elbow will also cap pressure as only so much air can get through the restriction. Much like setting the waste gate on a HX35. I see where you're going though.
 
so here is a question about this that just popped into my head. what about running smaller dv's like 131s and a light afc spring along with big injectors? it seems like you could have good streetability combined with good WOT at full travel. at least thats how i think it could be with my lack of sleep.

Sent from my YP-G70 using Tapatalk 2
 
no dice with that scenario..... even with 131's and 5x14's my boost response was much better with tighter afc
 
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