So I recently sold my HKS BOV to go back to the stock one. But what I noticed afterward, is that full boost comes at 300 RPM slower and 5 PSI less! What the heck? I checked all the hoses, everything seems to be tight, I have no idea what is wrong with my car.

My mods are...

T1R intercooler pipes
Agency power intake
Cobbs stage 2 93+SF

Edit:

So I might have found the reason for this. Apparently the stock BOV opens up at certain PSI, this is perhaps the reason it is spooling slower. Also, when I take a look at the datalog, I get virtually NO knocks compared to the HKS BOV SSQV, probably because I was running VTA instead of recur.

 

Hm.

That's an odd one...

Did you remove the boost pill to do the Stg 2?

 

yeah i felt the same way. i had a turbosmart and besides the sound it actually felt better then the stocker and the spooling was faster too.

 

Ya, I removed the pill. Odd that you have the same problem too...looks like a BOV does have its use

 

That's funny. I removed my HKS SSQV and put the stocker back on... you can definitely notice a difference... I have a feeling that the stock diverter valve is leaking under pressure.

Hate to admit it but... I actually miss my HKS! lol

 

I miss the HKS bov as well, shouldn't have sold it!

 

dang figured the stock bov would been better

 

I am having the sme problem, I was having issues with the car shutting off under part throttle boost like in 4th and or 5th gear, but when I changed the BOV back to the stock one it does not do it at all anymore. I can actually hear the Bov leak sometimes lol. I also went to the track the other night and could only make a 13.3 pass or something like that and the mph was way down, the only mods are the boost is turned up to like 24 and and have a full exhaust. so I dunno, my guess is as good as yours.

 

I'm surprised the cheap fix wasn't told to you

Ask Oliver about the cheap fix I was using ..

 

what was this cheap fix that you speak of, because I still have an HKS as well but it was creating way to much flutter in the intake and throwing the maf way out of wack and then shutting the car off

 

Damn it, Oliver is keeping so many secrets from me!

At least now I don't have to get a new BOV

 

Flip the stock BOV around. Instead of boost pressure pushing up on the piston and opening the valve, the pressure pushes down on top of the piston and keeps it closed, just like the HKS.

 

does this really work, or is this someone just messing around trying to fool me lol. because at this point i am willing to try anything just want my car to be running at its best ya know.

 

No messing around about it. Why wouldn't it work?

 

So with just a flip, it turns into a pull type BOV...lolz