Strange noise after 4k!!

[superflysr20]

I have a 1990 s13 red top sr20det with a greddy fmic and bov with the stock manifold (soon to upgrade)

In first and 2nd gear my car makes a really odd almost like quacking/rattling noise when reving above 4k. This noise gets more intense as the car warms up. It may be paranoia but I also feel like the the turbo/intake inhale sound sounds off as well?

I checked it out and the sound looks like its coming from under the exhaust (or is it turbo?) manifold shield... could it be an exhaust gasket or the turbo gasket?

[sommmatt]

Only in first or second? Try transmission.

[superflysr20]

well its most audible in first and 2nd... I can still faintly hear it through the rest of the gears

[adrianfromthecastle]

notice any coolant leaks? Check your turbo lines

[sldewyz]

i had the same problem, it was both a leak in the exhaust, and the heat sheild under and above the catalictic converter. very weird it only happened after 3.5k but that fixed it.

[superflysr20]

i had the same problem, it was both a leak in the exhaust, and the heat sheild under and above the catalictic converter. very weird it only happened after 3.5k but that fixed it.

How expensive/what was required to fix your problem... I have a megan racing downpipe with a blitz nur spec cat back... was the exhaust gasket your problem?

[sldewyz]

no i had the stock exhaust, it was leaking cuz it had a small hole in it. and it didnt cost me anything to rip out the exhaust shields around the cat, just take out the bolts lol...im not sayin its your problem 100% but thats what mine did and i did the above and it worked fine

[superflysr20]

took it to a shop today... dude said he didnt hear anything!!! (i think he just wanted to get outta there) The more i listen the more it sounds like a heat shield rattle....

[sldewyz]

try taking it off and see if it works...if you can its good to have it on there so maybe replace bolts? or find another one to pu up

[superflysr20]

lol i wonder how rusted these babies are gunna be

[xX RB Xx]

sounds just like the exhaust. my rb did the exact same thing. it made a rattle noise that i only noticed around 2.0-2.5k rpms. it was annoying.

[superflysr20]

Man... did things take a turn for the worse. I drove the car home from college yesterday (two hour drive) and since I have gotten back the car just sounds worse and worse.

The noise now sounds like an old chevy pickup truck during acceleration (real deep and puttering). I can hear it through all the gears and its so loud that I can barely hear my bov.

Im pretty sure its not a rod knock (holy crap I hope not)and im pretty sure its not the turbo cause my boost gauge is showing full boost.

What the hell?

[sldewyz]

then dont drive it until you know someone that can help u asses the problem properly..sounds like a heat shield rattle is the least of your worries. whens the lats time u checked oil and things like that

[wzntha]

.

[superflysr20]

this sound is audible through every gear at any rpm as long as i'm accelerating. the car doesn't seem to have any power loss, and the sound seems to be coming from somewhere between the downpipe and the exhaust manifold. any clue to what this may be? i will post a video of the sound if i can figure out how to.thanks.

[superflysr20]

found the problem... turbo manifold crack

am I ok driving on this in the mean time?.... im not going anywhere far but the 240 is all I got!

[sldewyz]

its not the greatest thing to do, but im sure youll be fine. order one soon and ull be good to go.