How boost leaks can KILL your power - and how to test for them
Originally Posted by Warrtalon
This is the link I used to make mine. It seemed to work, but I appeared to leak at the valve stem once I hit 1.6bar. Also, I was only able to get to 1.6bar using a freakin bicycle tire pump (oof). My air compressor would only pump the system to 1.2psi, then stop, even though I had NO leaks. My only guess is that there was a malfunction at the point where the compressor hose mated with the valve stem...
How did you get 1.6 bar espeically with a bike pump? Was your car at TDC? Did you cap the upper pipe? Best I got using a compressor was 15lb. The rubber on the turbo inlet was balloooning like crazy.
Originally Posted by Warrtalon
K&N panel filter, 3" Cat-back, S-AFC, and Hallman Pro MBC
Nothing major, and the first 3 mods were working like a charm with no leaks and no problems whatsoever until I installed the Hallman. At first, I was peaking and holding 1.4bar or so in 3rd gear with only a slight taper near redline (assuming the stock bov was leaking it off). I could run full boost at WOT to redline in gears 1-4 without the bad leak ever happening.
I then went to the drag strip, and on my first launch, PSHHHHHHHHHHHHHH, the leak occurred. At first, it would only happen when there was immediate full boost like on a launch or after a really fast 1-2 shift near redline. Now, after re-installing EVERYTHING 5 times, the leak occurs in every gear at 6k rpm, so it's much worse now. I assumed that I had made a mistake in reassembling everything, but now that I've done the pressure test and ruled out all the IC connections and vaccuum lines, I am clueless. My only guess now is its either the Hallman somehow messing up (doubtful) or the stock BOV is sticking open, if that's possible.
Nothing major, and the first 3 mods were working like a charm with no leaks and no problems whatsoever until I installed the Hallman. At first, I was peaking and holding 1.4bar or so in 3rd gear with only a slight taper near redline (assuming the stock bov was leaking it off). I could run full boost at WOT to redline in gears 1-4 without the bad leak ever happening.
I then went to the drag strip, and on my first launch, PSHHHHHHHHHHHHHH, the leak occurred. At first, it would only happen when there was immediate full boost like on a launch or after a really fast 1-2 shift near redline. Now, after re-installing EVERYTHING 5 times, the leak occurs in every gear at 6k rpm, so it's much worse now. I assumed that I had made a mistake in reassembling everything, but now that I've done the pressure test and ruled out all the IC connections and vaccuum lines, I am clueless. My only guess now is its either the Hallman somehow messing up (doubtful) or the stock BOV is sticking open, if that's possible.
-Paul
i might give that pressure tester a try tonight.
Originally Posted by GOKOU
How did you get 1.6 bar espeically with a bike pump? Was your car at TDC? Did you cap the upper pipe? Best I got using a compressor was 15lb. The rubber on the turbo inlet was balloooning like crazy.
Using my compressor, I could only get it up to about 1.2bar, though, but I don't know why. The silicone hosing I used to cap the turbo inlet was not ballooning...
Originally Posted by Sean I
Surprise Surprise. Seems to be common assault these days. What do you expect though....
Originally Posted by Warrtalon
K&N panel filter, 3" Cat-back, S-AFC, and Hallman Pro MBC
Nothing major, and the first 3 mods were working like a charm with no leaks and no problems whatsoever until I installed the Hallman. At first, I was peaking and holding 1.4bar or so in 3rd gear with only a slight taper near redline (assuming the stock bov was leaking it off). I could run full boost at WOT to redline in gears 1-4 without the bad leak ever happening.
I then went to the drag strip, and on my first launch, PSHHHHHHHHHHHHHH, the leak occurred. At first, it would only happen when there was immediate full boost like on a launch or after a really fast 1-2 shift near redline. Now, after re-installing EVERYTHING 5 times, the leak occurs in every gear at 6k rpm, so it's much worse now. I assumed that I had made a mistake in reassembling everything, but now that I've done the pressure test and ruled out all the IC connections and vaccuum lines, I am clueless. My only guess now is its either the Hallman somehow messing up (doubtful) or the stock BOV is sticking open, if that's possible.
Nothing major, and the first 3 mods were working like a charm with no leaks and no problems whatsoever until I installed the Hallman. At first, I was peaking and holding 1.4bar or so in 3rd gear with only a slight taper near redline (assuming the stock bov was leaking it off). I could run full boost at WOT to redline in gears 1-4 without the bad leak ever happening.
I then went to the drag strip, and on my first launch, PSHHHHHHHHHHHHHH, the leak occurred. At first, it would only happen when there was immediate full boost like on a launch or after a really fast 1-2 shift near redline. Now, after re-installing EVERYTHING 5 times, the leak occurs in every gear at 6k rpm, so it's much worse now. I assumed that I had made a mistake in reassembling everything, but now that I've done the pressure test and ruled out all the IC connections and vaccuum lines, I am clueless. My only guess now is its either the Hallman somehow messing up (doubtful) or the stock BOV is sticking open, if that's possible.
Originally Posted by 3deep
Sounds like its time for a better blowoff valve.Try a forge.
take off your bov and plug the intake and upper ic and see if you lose boost. If not, you know its the bov, if it does, its something else. It will not hurt to give the car a little turbo surge a couple of times. Just trying to save you money, and nothing feels quite like the stocker.
Originally Posted by an0ther
take off your bov and plug the intake and upper ic and see if you lose boost. If not, you know its the bov, if it does, its something else. It will not hurt to give the car a little turbo surge a couple of times. Just trying to save you money, and nothing feels quite like the stocker.
i think i know what it is, do you have the stock intake box in? if you do check and see if the clips are on the scoop that goes to the airbox, if not it will suck the scoop up against the hood. you mMUST have the clips in the scoop, i made this mistake. I bet you forgot to put them in when you put on your K&N. 
Originally Posted by Transient
i think i know what it is, do you have the stock intake box in? if you do check and see if the clips are on the scoop that goes to the airbox, if not it will suck the scoop up against the hood. you mMUST have the clips in the scoop, i made this mistake. I bet you forgot to put them in when you put on your K&N.
It isn't a leak ...BUT....when you floor it, at about 5500-6500 rpm enough vacuum is created that the scoop is sucked UP against the hood. Then not enough air can get in...can't boost...less power...and a crazy whistle noise as the air tries to get in the snorkel between it and the hood. Trust me I did it.