High Pitched Noise Under Load

[200sxRb20]

ok, now i have a new problem and will do my best to describe it. engine is an r32 rb20. under load, usually around 3-4000 rpm I get this high pitched whistle/noise. it starts off low pitched but rev it abit higher and it gets..higher pitched..yeah. cant seem to figure out what it is. fresh oil change, checked all the couplers for the front mount intercooler piping. checked as many places i could for some sort of leak that would give me an indication of why its doing this. also the exhaust sounds abit different like there is a leak somewhere, sounds more like an old truck now and every now and then when shifting or rpm drops i get a pop out of the exhaust, usually abit of fire. it tends to want to just die on me as well. starts fine but from time to time if i dont hit the accelerator pedal, the rpms will just drop until it dies. any ideas? here are a list of my mods incase something might be related. the engine has appx 60,000 miles on it(around 96,000 kms?)

ARP Head Studs,

GReddy 1.2mm Head Gasket,

GReddy Timing belt,

Fidanza adjustable cam gears,

Hybrid FMIC and piping,

Turbo XS BOV,

HKS pod filter,

3" exhaust with Fujitsubo NGK axle back

GTR fuel pump

Koyo radiator w/ dual 12" fans,

GReddy EManage,

GReddy Profec E-01

,GReddy Auto Timer,

HKS Hypermax D coilovers,

front camber plates,

Cusco front strut bar,

Cusco front tension rods,

[200sxRb20]

heres a vid or two of the noise, hope this helps out.

http://s25.photobucket.com/albums/c73/vg30...nt=105_1583.flv

105_1582.MOV

Edited December 16, 2007 by 200sxRb20

[(B1) MR_fanny]

have you pin-pointed exactly where the nois is comming from? turbo? front of the engine? i had a loud screeching whistle noise on boost that turned out to be turbo + manifold gasket leak. it didnt affect idling though.

[Dj laBBy]

My first thing i thought of was exhaust, as if you get a bit of air entering the ex, it can combine and you can get that pop from the unburnt fuel, could explain the whistle too as coz its on load it could be coming out from the manifold or somewhere. Oooh check that you have your O2 sensor in there, sounds silly, but i forgot to put mine in one time and the car ran like a bitch until wot and i had a serious noise/wistle. I just listened to the vid. Damn that is weird. Besides the sounds of tappets clacking away, it sounded like a turbo type sound, like proportional with the turbo, not engine revs(or am i mistaken) Thats where i'd check, turbo area...

[200sxRb20]

lol, yeah the 02 sensor is in, cant say that ive made that mistake before. cant really pin point the area the noise comes from, will try some more today as well as check the turbo out. has no shaft play in it, i have checked that out, but ill check the gaskets and such today.

[(B1) MR_fanny]

what i did was use a engine carbon cleaner that you can get from a subie dealer workshop for $15-20. when you start and rev the engine to clean it out, white smoke should come out of any area's in the engine bay that has a leak. smoke came out from my turbo side so i knew it was the gaskets.

[TTT]

on most nissans, the gaskets around the hot side become and issue.

Check these gaskets between:

engine and manifold.

manifold and turbo

turbo and dump pipe.

ALSO, you may find that you are missing some nuts or that they are loose.

check the nuts that hold all of the above together.

that subi upper engine cleaner stuff is good shit on the EJ motors..

probably have same effect on any motor.

farken stinks when coming out the exhaust though..

Edited December 18, 2007 by GTST

[200sxRb20]

thanks for the tips guys working on checking the gaskets on the mentioned areas today. might use this as an excuse to put the larger turbo on..

[200sxRb20]

ok so finally got around to working on it. exhaust manifold gasket checked out, manifold to turbo gasket had crack in it, but that wasnt the issue. broken blades(see pics). usually id be upset about a broken turbo, but just using this as an excuse to put on the t3.

[W0rp3D]

dam, i was going to suggest that one of the belts were too tight, couldnt be more wrong.

[200sxRb20]

yeah, the video was abit misleading sound wise, but didnt hurt to check the belts first just incase it was something simple like that.