i looked at the spring chart for the tial q and the lowest is a -6psi spring which is black. Is that the one I need?

 

then what does he do when the valve is open while cruising? and when he goes WOT and the BOV is pushed open for a brief second before the charge gets to the intake manifold and down the vacuum line into the BOV and the car falls on it's face?


do not get the -2

 

get the appropriate spring(if you don't already have the correct spring), vacuum line ID size (1/4" ID) and have the car re-tuned by someone reputable


I've also seen it where the cam timing was so F'ed up because a 'pro' tuned the car the car started to pull more vacuum as throttle increased causing the bov to suck open at part throttle yet it remained closed at idle

 

There has to be someone out there that can post up their setup that works fine.

 

Whats your wgdc look like at low rpm? Are you self tuning? What cams?

 

What are you running for boost control? OE ECU?

Lower % WGDC, possibly even % TPS vs WGDC. You describe surging, you were told what to do about it, what's the problem? Did you lower WGDC? Results?

 

Seems like a lot lately that people have solved surging issues with lowering WGDC on standalone boost controllers, and factory ECU boost by dropping the 100% wgdc under x rpm. I think this would be the OP's best place to start, and move from there.

a leaking BPV on spool is not necessarily the worst thing. Its getting the turbine up to speed and applying pressure to close it on a good design, where the diaphragm or pistion is larger than the valve face thats sealing the uicp. On maf non recirculated is the worst thing you could do in this instance though.

 

I don't do any of my own tuning. Thats one thing ive never took the time to learn. All I'm looking for is someone with a mild bolt on evo x to post up their setup and that they don't have any of the surging issues like i do.

 

It might help if you post this in the evo X section if that's what you're looking for.

 

changing anything with the boost control in this case is not likely to help. I suspect the boost levels of concern here are below the baseline wastegate pressure so it's going to stay closed regardless of what you do to the wgdc or mbc.

 

Wtf I swore i put this in the evo x section. If someone could move it I would appreciate it.

 

Agreed that the logic isnt there, but I can definitely find the posts where members have solved their problems this way. Its worth a shot for as simple as it could be. Infact there was 2 recent threads where this was the case. One was a moderator/guru raptord maybe? The other was jameswwt as far as i can remember.

 

I've seen plenty of wot spool up surge problems fixed via wgdc changes, but nothing on cruise surge.

 

Here is a video in the car of what is happening.

http://youtu.be/uNB3JXu6T94

 

yup, true comp surge

didn't hear a single BOV sound