Correct Way To Set Up Profec B To External Gate

[Simon-S14]

Hey guys ive hearing some conflicting things in regards to hooking up the lines to an external gate. The instruction manual says to hook up the side port to manifold and the top port to the COM side of the solenoid with NC seeing the hot pipe pressure.

however a few guys i know who run them have them hooked up like you'd see on an internal gate actuactor with NO to hot pipe pressure and com to the side port of the gate and nothing in the top port.

when asked why they did it this way compared to the way the manual says to do it they said they had overboost issues,

anyone want to clarify?

[D_Stirls]

Simon have a read of the turbo smart instruction manual, i know it's a different controller but they go through the different setups and advantages and disadvantages of each. Pages 6, 7 and 8.

eBoost2_Manual_V3.16.pdf

[TiTAN]

One line is pressure to help hold the gate closed (intake plenum AFTER TB) , one is pressure to open the gate before the TB.

How you hook the lines up to the NO (normally open), NC (normally closed), and COM (common) fittings on the boost control solenoid depends how you want the solenoid to work. Hooking the source (from intercooler pipe pre TB) to COM and from NO to the waste gate will give the safest option as the wastegate will open at spring pressure (high solenoid duty high boost - low duty low boost) if the solenoid fails, hooking it up to COM and NC will hold all the pressure back from the gate (and give the best response/may be required to hold boost using antilag) until duty is added to the solenoid so if the solenoid /lines fail you run unlimited boost (low solenoid duty high boost - high duty low boost).

[Simon-S14]

ah yes that makes sense now thanks, I have a fairly weak spring set up and wish to run around 1.1 bar. which way would be the best way to hook it up for fast ramp up or does that not really matter as the controller will take care of that regardless?

[TiTAN]

you may be limited to one way or the other depending on how the profec b works. if it is purely duty based then it can use either method but most will only do the safer of the two methods.

[Simon-S14]

it can do both methods, its pretty much a duty cycle solenoid. but which method would best suit my application?

[TiTAN]

try both and see which you prefer. its not hard to change which way it operates just a bit of fiddling to get the boost pressure right again.