ST Boost Control problem

TWilly

Specialist
Jul 7, 2017
85
18
0
Ride
Tyler
need some help with the boost control side of my AFC single turbo kit. using jb4 + ST BEF. I can run wastegate pressure (9psi) no problem but cant get anything over that in any other map. I narrowed it down to being on the electric side. I can make the solenoid click if I give it power and ground. but where my problem is (I believe) is on the car side. At the Solenoid connector the one pin I have the 12volts with the key on. the other pin I have nothing.. (where I believe it should be about 6volts or so). so my question is where does that pin get its power from? the jb4?

Thanks for any info or thoughts on this.
 

Terry@BMS

Sergeant
Platinum Vendor
Jan 23, 2017
462
379
50
There isn't a good sure fire way to troubleshoot it. One thing you could do is install a volt meter on the solenoid itself (to each side) and then see if the voltage is changing as you try to build boost. If it wasn't though I don't think you'd have solenoid clicking doing the ign on, engine off, half throttle test.

Once you rule out electronic issues then it can only be something physical with the line routing or solenoid itself.
 

kaldyn55

New Member
Jul 8, 2023
2
0
0
need some help with the boost control side of my AFC single turbo kit. using jb4 + ST BEF. I can run wastegate pressure (9psi) no problem but cant get anything over that in any other map. I narrowed it down to being on the electric side. I can make the solenoid click if I give it power and ground. but where my problem is (I believe) is on the car side. At the Solenoid connector the one pin I have the 12volts with the key on. the other pin I have nothing.. (where I believe it should be about 6volts or so). so my question is where does that pin get its power from? the jb4?

Thanks for any info or thoughts on this.
Did you ever figure this out?
I am having same issue. My boost target is 17 psi and I am only getting 11 psi which is waste gate spring pressure. When I tried to test Mac solenoid I do not get any clicks when pressing pedal on map 1 with ignition on. I manually applied 12 volts to mac solenoid from external motorcycle battery and I do get click from solenoid . I also tested power at solenoid connectors on the car side and I get 12 volts on one side and 0 on the other wire. On both connectors .
 

kaldyn55

New Member
Jul 8, 2023
2
0
0
There isn't a good sure fire way to troubleshoot it. One thing you could do is install a volt meter on the solenoid itself (to each side) and then see if the voltage is changing as you try to build boost. If it wasn't though I don't think you'd have solenoid clicking doing the ign on, engine off, half throttle test.

Once you rule out electronic issues then it can only be something physical with the line routing or solenoid itself.
Terry any idea why mac solenoid is not clicking when ignition is on l, map 1 and pressing pedal down ?