Yeah that is a tradeoff that only you can value. I personally have never accepted sacrificing spoolup speed. Me I'd rather set the WGA at optimal preload, which for me is about 2# before peak boost.

After I set WG spring pressure as described above I know that I am pretty much maximizing spoolup speed. If this induces compresor surge...then I'l gladly live with the resultantly shortened bearing lifespan. I just personally like to maximize spoolup speed on a turbocharged car.

I am not that sold on BCS' myself. I like setting boost the old-fashioned way first. I disconnect all BCS's, MBC,s and EBC's first. Then I run a hose from the comp discharge nipple to the WGA cannister. Then I set spring pressure by rotating the turnbuckle on the end of the wastegate actuator rod.

I set spring pressure to just two PSI below peak target boost. This way I am assured of having the quickest spoolup possible. And as I said...I'll accept a bit of surge .

I have always aimed for really quick spoolup as I value this to be a paramount asset on turbocharged cars. Of course, I have nevr had to wonder why my turbo is spooling slowly or why my compressor is surging. I am pretty much on top of it.

Sure, you have the tecnological sophistication of a three port BCS, but you yourself admit that your turbo spool is not optimized and that your compressor is surging anyway, and that you'll have to further reduce the WGDC. So, you have both slow spool and compressor surge simultaneously...Go figure! No one else is getting their Black to surge on a 2-Litre engine.

 

I have experienced a little compressor surge on my FP Black before. Although, my problem is my GReddy Profec B SpecII. The Profec B SpecII is a great EBC, but it just does not have the control needed to maximize the Black's characteristics. I'm going to move to the Grimspeed BCS and go back to ECU based boost control.

Also, to the guy saying you can't do pulls on a FP Black in 4th gear without shortening bearing life, this is totally not true. There is nothing wrong with doing 4th gear pulls, as long as there is little or no compressor surge. Real compressor surge can occur in any gear and IS bad for the turbo, regardless. But to make a blanket statement about not being able to do 4th gear pulls is ridicules. Hell, even 5th gear pulls are fine, as long as you're not doing top-speed runs for long periods.

 

Has anyone else had compressor surge on their Black? If so, what is your set-up?