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We'll, upped the DC to like 70-80% and my 18psi boost cut-off kicked-in and momentarily shut the engine down, so looks like the current arrangement has some decent range (7-18psi). I think it may have 20psi if needed so I don't see the need to reroute anything at this point!
We'll, upped the DC to like 70-80% and my 18psi boost cut-off kicked-in and momentarily shut the engine down, so looks like the current arrangement has some decent range (7-18psi). I think it may have 20psi if needed so I don't see the need to reroute anything at this point!
That's a great range. I'll be contacting you to assit me with the setup down the road if you don't mind?!
I agree, though this won't give you near as wide of a boost window without on board air. Which might not be a concern depending on boost level he wants to run.
I use a 3 port solenoid. With no power it allows all the boost to the bottom port and none to the top. As it pulses it slowly limits flow to the bottom port while allowing more air to the top. When it's 100% closed it allows no air to the bottom and 100% to the top.
With a 3 port solenoid and no on board air this will give you the largest boost window. I can run 8-25 lbs this way... Sure I can run more but haven't tried more DC at this point. You do need a small bleed hole for the top chamber when plumbed this way.
i did this on my evo and didnt like it. i didnt like the bleed/vent stuff.
I have since gone to this and have been very happy with it.
i did this on my evo and didnt like it. i didnt like the bleed/vent stuff.
I have since gone to this and have been very happy with it.
lots of different ways that all can work well.
That method will have less overall range than what Forcefed is using, but as you say there are literally dozens of configurations and it's up the each user to decide what their setup needs.
my spring pressure is about 14psi and ive maxed my gm 3 bar (28psi measured) on 60% wgdc ¯\_(ツ)_/¯
I just switch to a 5 bar yesterday so i can keep going.
My spring pressure is 7psi and I've run up to 28psi...just havent tried more yet.
A genuine GM 3 bar should read to 310kpa which is a little over 30psi.
yeah its the scaling in my pcm. the evo pcm is all hacky and hard to get right...most people use a omni 4 bar and the info to do your own stuff isnt always easy to come by. so my datalog flat lined at 28.x psi but it was whatever the sensor maxes out at.
during my 5 bar swap i spent some time digging in the source and this sensor should be much more accurate now, i learned a little better how the scaling works and how to datalog it more accurately.
As expected the DC/open-loop method does not correct for a preset target boost so I get a boost curve that is exactly like my manual controller....it varies slightly with load. Some day when I get brave enough I'll try closed-loop control. Here's what it looks like now...I am happy with the consistency.
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