I purchased this Evo 8 that came with the older style Profec B electronic boost controller. I've noticed recently, boost seems to just do what it wants and I've even hit 30psi not paying attention. I've checked and rechecked the vacuum lines and all the connections, and everything seems to be fine. I'm assuming, because of the Profec B's reputation for unreliable solenoids, that mine failed on me as well.

Which leaves me with a few choices;

1) Replace the solenoid with another $100 GReddy solenoid
2) Replace the controller entirely with a MBC
3) Skip it all, purchase a 3 port solenoid, install, tune, and allow the ecu to do all the work. I don't know how to tune, so I'll just let Aaron @ ER do his magic for me. (this option will be spendy compared to the other two)

if I do replace the solenoid, do I have to go with the GReddy unit or will any 12v solenoid work?

Opinions?

 

Get yourself a manual boost controller and get a retune.

 

I have no experience tuning so take this with a grain of salt but I was told by a tuner that with smallish turbos with moderately low boost, eg. stock frame and turbos like 30r's, that 3-ports would be your best bet but anything big with high boost, an MBC would be best because 3-ports are only good for a certain range.

 

Hrmm I didn't really know that about 3 ports. I'll have to look into it more.

I kinda wanted to salvage the profec b but I'm probably just going to pick up a Hallman, Forge or Grimmspeed mbc and call it a day.

 

I have a profec solenoid that I will sell you. Pm me if youre interested

 

Ive got a greddy profec b spec II and the boost solenoid also acts funny. I've got it pretty consistent, but before I start my build its definitely going to change or go.