STOCK BIPASS VALVE tested.

[Kosh]

Ok man, I just didn't want to relive the 'my engine is going to fall out' paranoia that spreads around here sometimes

 

[Haltech]

Ok man, I just didn't want to relive the 'my engine is going to fall out' paranoia that spreads around here sometimes

LOL, theres enough of that going around as is! (boobs)

 

[sleeper3]

what do you guys mean when you say "my car isn't holding boost?"

like your boost needle is jumping around? or falling off early? I don't understand.

 

[knowledge007]

So wait a minute, I am about to pick this thing up. What would guys recommend? I have a CAI, TBE @ stock boost right now. Waiting for the connectors from CP-E for the EMS, or waiting for someone to take the EMS off my hands.

BTW, I can sure tell you that when I took my HKS off and put the stocker back on, shifting did become a little smoother.

 

[nypest]

lol thats what im trying to find out .......Seems like ppl like the blue spring i think im gonna try the yellow with the shims first to see how she reacts before i go to the blue spring. Im just afraid that under low boost the blue spring might hold the piston shut, creating a surging situation.

 

[Haltech]

I hold boost fine with the blue spring.

 

[nypest]

I hold boost fine with the blue spring.

im more concerned over the release

thank you for your input haltech as always!!

 

[ill_eagle94]

Just because 1 or 2 people's stock bpv isn't holding boost doesn't mean all of them are leaking. Wouldn't hurt to test your own but it doesn't mean everyone's isn't holding proper boost levels.

I could actually feel mine leak going done the 1/4 mile. It would pull hard then let up and pull hard again. No missing, no backfiring, just a smooth fluctuation between more and less power.

 

[LazerBlueP5]

Forgive me for this noob question: If the stock bpv is crappy would that play a part in our brutal lag during upshifts? I know a turbo engine will bleed off boost when the throttle's lifted, but other turbo cars I've driven haven't felt nearly as bad. Isn't the bpv supposed to vent the intake backpressure when the throttle's closed to let the turbo freewheel and build pressure quickly when the throttle's reopened after a shift? I refuse to flat-shift as it's so hard on the drivetrain and I like letting the revs match for (mostly) smooth upshifts even when I'm charging through the gears.

I've noticed this too! I hope someone addresses this question.

 

[nypest]

I've noticed this too! I hope someone addresses this question.

Any time you lift of the throttle your bpv/bov which ever you desire should bleed of un-used boost (into the intake or atmosphere depending on the system you run) stopping evil compressor surge. Using a more aggressive bpv with a stiffer spring may help close the system up more efficiently keeping some of that hard earned boost for the next gear

Trick is tuning it right so you get less bleed off and leakage(if its leaking) without going to far the other direction and having nasty compressor surge.

 

[redspeed]

Well, I just installed a type rs bov. I feel like is holding to 6k rpm a lot better and the sound is the best I heard so far. Is on vta until I get the recir adapter, but I just love the sound. Slight flutter sound at low boost and a solid wooshhh at high boost/full throttle. I don't know if that actually means the stock bov was leaking, but it sure revs more freely to 6k.

I also got a cel. I forgot the code #, but it was a lean code bank 1. A lean code with a vta bov, wtf? Every body gets slightly rich when shifting with vta and I got a lean code. I wonder if this means I gained some boost? I don't have a boost gauge yet, so I'll find out later.