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Check your Y-pipe, mine leaked hella bad once and i found that the y-pipe is usually the cause cuz the pressure from the turbos are so strong that it'll force the clamps loose sometimes. Hope that helps. Makes a hella lot of a difference too. Low boost to regular boost is a big difference!
I had the same problem and it turned out to be the rubber fitting the connects the intercooler piping to the Y-pipe .. if there is a tear in it most your boost will escape ... 50 bones from the dealer.
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FYI, that is your intake elbow, not the Y-pipe that everyone is talking about. The y pipe is located just below the hot side of the intercooler piping on the pass side of the engine bay and acts as a "collector" for the two turbos as it routes compressed air into the IC pipe. A rubber coupler connects the y pipe to the IC pipe via 2 hose clamps, and it is this coupler that often splits and creats [boost] leaks. CHeck that baby out...
On a related note, my FD also makes a whistling noise only when I have the fans on only when I give it gas. Does your whistling occur when you have the A/C or the fans running?
93 Red R1, sold
87 Red SE
Umm... that's not your Y-pipe, that's your elbow. The connection the guys are talking about above is the one that couples the black crossover tube that angles from the center of the engine back towards the passenger side to the metal pipe under the pass side of that black crossover pipe. This coupling is rubber, and is known to fail. The metal pipe under the crossover tube is your Y-pipe, BTW, though it's more an upside down Y. It combines the turbos, with a little door in the middle to keep out the secondary boost until 5000 rpm (called a charge control valve) (as opposed to charge relief valve, oftem mistaken as a second blow off valve, but I digress...)
Two things: do you have loss of boost? For that matter. do you have a boost gauge? I see the typical mount nipple is capped. Second, I have a nice loud whistle whenever my primary turbo spools up, so you may just be experiencing normal spool sound, though looking at your nicely stock set up, I'm guessing you don't have a down pipe in there yet?
Also, get that plastic AST replaced ASAP! They split open after long time, spraying coolant everywhere and potentially overheating your engine.
Welcome to the madness! I look at your pics and remember when mine was virgin!
I'm somewhat new to the third gen, but is there any reason why your air bypass valve is disconnected from the air box (its the brown valve just below the passenger side strut tower in your picture)? Under certain throttle/load/rpm situations I believe this could vent boost from the turbos which could create a whistling noise.
Originally posted by byrden I'm somewhat new to the third gen, but is there any reason why your air bypass valve is disconnected from the air box (its the brown valve just below the passenger side strut tower in your picture)? Under certain throttle/load/rpm situations I believe this could vent boost from the turbos which could create a whistling noise.
He just vented it to the atmosphere. That wouldn't be causing any loss in boost or that whistling noise.
It's just making that PSSSHHHHH noise that an aftermarket bov makes.
Originally posted by Palumbo1337
so now i know its the coupler/pipe down there
Don't be so sure just yet. Hopefully the coupler is the culprit (although I believe it is a $70 or so part from the dealer), but it could be about a million other things too. The stock FD sequential system is very complex and often difficult to diagnose.
Also, hook up a boost gauge. There is pretty much NO WAY you know what boost pattern you have without one unless you have been driving FDs for many years and know exactly what the stock pattern feels like.
Good luck with everything.
93 Red R1, sold
87 Red SE
Sorry, to dig up such an old thread, but I am having the same problem. I have a whistling sound that gets louder as the RPM's increase (has no correlation with vacuum/boost level). There is no audible sound at idle and the whistling becomes noticably louder when I flip the fans on. I suspect the coupler between the crossover pipe and the y-pipe (this is where it sounds like the sound is coming from). Also, there have been no changes in the boost pattern.
So did you ever find out if the coupler was the problem? I will be taking the intake off and looking once I get back home from school.