weird noise when underthrottle? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

qvester · 09-07-2004, 08:53 AM

i have a redtop in a 89 fast back when i accelerate or give it gas i don't have to be moving, i have a weird noise it sounds like my car is a airplane getting ready for take off i still have the stock fan off of the water pump on it could it be the fan bearing going out of that. i know alot of people take that fan off when they do the swap but i left it on should i just take it off and see if it goes away i have put about 25k on my swap and it just now started to make this noise it really sounds like a airplane or like a really loud fan i am almost sure it is something to do with that just needs some input thanx.

asbestos · 09-07-2004, 01:29 PM

The fan clutch could be seized up causing the fan to spin at the exact same rpm as your motor and that would cause the loud "wooosh" sound whenever you rev up. This happened on my old 94' 300zx, it was very annoying because it seemed like you could hear more of the air sound than the motor sound.

Just use this "problem" as an excuse to install electric fans

qvester · 09-07-2004, 03:26 PM

ya that is what i figured it was ya more of a woosh sound gets real loud sometime it goes away i actually have an electric fan installed on my radiator that is why i dont' even really need it i jsut left it on how hard are they to take off anything specail to use or to do once it is off?

sleep · 09-07-2004, 07:10 PM

take off the couple of bolts to remove the fan from the clutch, then remove the clutch from the pulley. 5 minute job

s13silady · 09-08-2004, 02:14 AM

does it sound when you are hitting boost? because if its the sound im thinking of then we got a problem...i have my stock fan still installed and no problems with it...

if its the sound im thinking then your probably starting to develop a gap in between your turbo and your manifold due to the bolts getting loose..

then you have the time and your car is not hot, take off the heatshield to the mani using 10mm socket and reach down to the flanges where the turbo meets the manifold, and feel to see if all 4 nuts are there... if not then thats your sound..

i had a post a while ago describing my situation maybe it'll help you out...GL..

twitchy · 09-08-2004, 06:26 AM

could it be your turbocharger?

qvester · 09-08-2004, 08:36 AM

na i listen to it under the hood it is comming from the front where the stock fan is i am jsut going to try and take that off see if it goes away i have heard of them making that noise when the fan clutch goes out so thanx for the info i will check it make sure but i am going to try and take off fan first since i really don't need it......thanx

qvester · 09-08-2004, 09:28 AM

ya and if it was anything like that i wouldn't be able to build boost and i am building boost with no problems my turbo seems to be working fine no smoke or anything so that is what the problem has to be or the only thing that i can think of...

09-07-2004, 08:53 AM	#1
qvester Leaky Injector Join Date: Dec 2003 Location: Indiana Age: 42 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	weird noise when underthrottle? i have a redtop in a 89 fast back when i accelerate or give it gas i don't have to be moving, i have a weird noise it sounds like my car is a airplane getting ready for take off i still have the stock fan off of the water pump on it could it be the fan bearing going out of that. i know alot of people take that fan off when they do the swap but i left it on should i just take it off and see if it goes away i have put about 25k on my swap and it just now started to make this noise it really sounds like a airplane or like a really loud fan i am almost sure it is something to do with that just needs some input thanx.

09-08-2004, 02:14 AM	#5
s13silady Nissanaholic! Join Date: May 2002 Location: Bay Area, San Jose Posts: 1,804 Trader Rating: (0) Feedback Score: 0 reviews	does it sound when you are hitting boost? because if its the sound im thinking of then we got a problem...i have my stock fan still installed and no problems with it... if its the sound im thinking then your probably starting to develop a gap in between your turbo and your manifold due to the bolts getting loose.. then you have the time and your car is not hot, take off the heatshield to the mani using 10mm socket and reach down to the flanges where the turbo meets the manifold, and feel to see if all 4 nuts are there... if not then thats your sound.. i had a post a while ago describing my situation maybe it'll help you out...GL.. __________________

09-08-2004, 06:26 AM	#6
twitchy Zilvia FREAK! Join Date: Apr 2003 Location: Ontario Posts: 1,579 Trader Rating: (0) Feedback Score: 0 reviews	could it be your turbocharger? __________________ Who the hell needs a sig anyhow

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09-07-2004, 01:29 PM	#2
asbestos Join Date: Jul 2004 Location: fl Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	The fan clutch could be seized up causing the fan to spin at the exact same rpm as your motor and that would cause the loud "wooosh" sound whenever you rev up. This happened on my old 94' 300zx, it was very annoying because it seemed like you could hear more of the air sound than the motor sound. Just use this "problem" as an excuse to install electric fans

09-07-2004, 03:26 PM	#3
qvester Leaky Injector Join Date: Dec 2003 Location: Indiana Age: 42 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	ya that is what i figured it was ya more of a woosh sound gets real loud sometime it goes away i actually have an electric fan installed on my radiator that is why i dont' even really need it i jsut left it on how hard are they to take off anything specail to use or to do once it is off?

09-07-2004, 07:10 PM	#4
sleep Zilvia Addict Join Date: Mar 2004 Location: San Tan Valley, AZ Age: 42 Posts: 776 Trader Rating: (0) Feedback Score: 0 reviews	take off the couple of bolts to remove the fan from the clutch, then remove the clutch from the pulley. 5 minute job

09-08-2004, 08:36 AM	#7
qvester Leaky Injector Join Date: Dec 2003 Location: Indiana Age: 42 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	na i listen to it under the hood it is comming from the front where the stock fan is i am jsut going to try and take that off see if it goes away i have heard of them making that noise when the fan clutch goes out so thanx for the info i will check it make sure but i am going to try and take off fan first since i really don't need it......thanx

09-08-2004, 09:28 AM	#8
qvester Leaky Injector Join Date: Dec 2003 Location: Indiana Age: 42 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	ya and if it was anything like that i wouldn't be able to build boost and i am building boost with no problems my turbo seems to be working fine no smoke or anything so that is what the problem has to be or the only thing that i can think of...