Whistle on acceleration '94 (1 Viewer)

[lagwagon]

I thought I had seen something written hear before about a whistle on accel and I now have it. I am headed home saturday(about 450 miles). I am not concerned about the trip as it still runs great but am wondering if it is anything I can fix before I go. Of course I left the new intake and t-body gaskets at home. I will be checking it out tomorrow.
Thanks in advance, Jeff

 

[landtank]

My whistle left with my old exhaust. Put on a Borla and all is good.

 

[alia176]

Just curious, what exactly causes the whistling in the exhaust stream? Does it have something to do with air flow through exhaust valves?

 

[Photo_Cruiser]

Landtank,
was that just a catback, did you replace the muffler as well....I got the whistle, but I cut my resonator off to install a bumper. I'm thinking replacing everything from the cats back is the solution....any body that has done this have any muffler recommendations....does it matter that much...or just go with something hi-flow....

 

[Eduardo96FZJ80]

mine has it also, i just turn up the tunes

 

[RavenTai]

mine has it also, it sounds somewhere between a turbo and the chirpy exhaust noise that a VW betle makes (without the chug)

 

[GXO]

Awww come on, it is "VW" cool!

 

[RavenTai]

[quote author=alia176 link=board=2;threadid=14486;start=msg135792#msg135792 date=1081516201]
Does it have something to do with air flow through exhaust valves?
[/quote]

I don't think so but I do not know for sure, it does not sound like normal exhaust pulse, more like gas flowing past a sharp angle later in the system, a noise that that far up stream should not be able to make it through 2 cats a muffler and a resonator,

Photo cruiser did you have the whistle before you cut off your resonator? or only after?

the dealer Mech that did the pre-purchase inspection on mine said it was probably a broken baffle in the muffler or resonator,

 

[mabrodis]

Mine also had the whistle, I don't recall if it had it when I had my full factory exhaust on, I think it did, I know it had it when I cut the last resonator or whatever that thingy is at the back off. Now I have no whistle, but I have no muffler or 'exhaust' or anything, just a 12" piece after the cats...so it's really loud...loud enough I can't crank the tunes high enough to ignore it, believe me I've tried...

I think the whistle was designed in at the factory, to intimidate other vehicles who think we might have a turbo..

 

[landtank]

Borla is a cat back system. So yes the muffler was changed.

 

[lagwagon]

I was hoping you guys would just say " it's the vacuum line from there to here". I couldn't be that easy though. It sounds like a turbo except no tone fluctuation. I'll tell you if I find anything.

 

[concretejungle]

lagwagon, you mean sounds like a turbo but without the hard-on acceleration!

Yea, i've got the little wistle also on my 95, but it only occurs under hard acceleration. I was thinking maybe i needed to tighten the header up check the bolts along the exhaust for a loose leak somewhere. Who knows ???

It's Easter weekend and i'm at work This sucks i'm going wheelin!

 

[offroadkid]

My 97 has it. I just ignore it.

 

[montocr]

My 93 didn't make any noise. My 96 whistle is pretty loud. I have followed it on the freeway in another vehicle before and told the driver to floor it. It was very audible. I believe it comes from the tight pinch in the pipe between the frame crossmember and the cargo-area floor. My 93 wasn't pinched as flat. Also, how loud is the Borla exhaust?
Thanks,
Carl

 

[landtank]

The Borla is slightly louder and deeper than stock. Not really that bad at all. I'm not a loud exhaust kinda guy and it seems exceptable given it is a freer floing system than stock.

 

[Greddy0]

My 96 LX450 whistle also on hard acceleration. Thinking about swapping out the exhaust, what is the options for aftermarket? How about custom exhaust.... Mod the CATS to so they are higher up at the sametime. Run a high flow CAT, performance muffler, and straight out the back with no resonator.

 

[cary]

This was talked about a while back. Basically, you need to lube the muffler bearings as they have dried up. There are some Zirk fittings so you just hit them with a great gun. Synthetic grease works best with the high tempuratures.

Cary

 

[landtank]

Cary.....thanks for the help

 

[e9999]

dang you all, heard it for the first time (I think...) today after reading this thread !

E

 

[IdahoDoug]

This whistle is common if you scrape the tip of the exhaust pipe and create a burr or otherwise uneven edge. Take a file and emery cloth and clean things up. Nice clean edges vs a burr will actually cause a vehicle to pass or fail a required NHTSA "drive by noise level" test as we found at GM years ago.

DougM