high pitched whistle sound? from exhaust

KB2 · 05-10-2014, 09:00 AM

So, my exhaust lately has been making a high pitched/whistle type of noise lately upon acceleration, and it's quite honestly driving me nuts.

I have the hks hi-power, and it was great, until I recently got ppe long tube headers installed. And while I now make alot more power and the car feels great,it dosent sound great....

So In an attempt to experiment, I even removed the hks and installed my tanabe system. Now this one doesn't whistle, but it feels congested and is very raspy. Before headers, tanabe sounded great!

So now I'm in a debate, with a y pipe the car feels slow and you can tell a difference,but the whistle went away. With the "h pipe" it feels great, but whistles....

now the hks h-pipe section is not welded together, you bolt it together, so maybe that creates a whistle? Compared to a traditional h pipe?

My question is, how do I get maximum flow for my car, with my new headers, while still making it sound fantastic?

I'm considering the aam s-line mid pipe section. With tanabe axle-back....

If anyone has some feedback, I would love it. Because I'm going nuts over exhaust

KB2 · 05-10-2014, 09:13 AM

I should also say what my breather mods are;

Motordyne m370 intake manifold
Smooth tubes and filters
ppe long tube headers
Exhaust-
and custom up rev dyno tune.

JARblue · 05-10-2014, 09:30 AM

I'm assuming you didn't install some whistle tips?

Zteve · 05-10-2014, 09:46 AM

turn up the stereo. problem solved

SouthArk370Z · 05-10-2014, 10:03 AM

I'd try the piece-of-tubing-stuck-to-the-ear trick to try to locate where the whistle is coming from. With the tubing "amplifying" the sound, you may be able to hear it just by revving the engine. Once you know which part(s) is causing the problem, you can look for specific solutions.

zefaulter · 05-10-2014, 05:43 PM

Are you lowered? Did you scrape the hks? Maybe it has a tiny crack somewhere

KB2 · 05-10-2014, 07:03 PM

I am lowered...but not enough to damage it, that is a good thought. It's currently off the car, looks perfect

H2O_Doc · 05-10-2014, 08:00 PM

I sometimes whistle when I'm happy.

Maybe your car is just happy?

Now, if it starts yodeling, definitely get it checked out.

05-10-2014, 09:00 AM	#1 (permalink)
KB2 Base Member Join Date: Apr 2010 Location: Illinois Posts: 243 Drives: 370z Rep Power: 15	high pitched whistle sound? from exhaust So, my exhaust lately has been making a high pitched/whistle type of noise lately upon acceleration, and it's quite honestly driving me nuts. I have the hks hi-power, and it was great, until I recently got ppe long tube headers installed. And while I now make alot more power and the car feels great,it dosent sound great.... So In an attempt to experiment, I even removed the hks and installed my tanabe system. Now this one doesn't whistle, but it feels congested and is very raspy. Before headers, tanabe sounded great! So now I'm in a debate, with a y pipe the car feels slow and you can tell a difference,but the whistle went away. With the "h pipe" it feels great, but whistles.... now the hks h-pipe section is not welded together, you bolt it together, so maybe that creates a whistle? Compared to a traditional h pipe? My question is, how do I get maximum flow for my car, with my new headers, while still making it sound fantastic? I'm considering the aam s-line mid pipe section. With tanabe axle-back.... If anyone has some feedback, I would love it. Because I'm going nuts over exhaust

05-10-2014, 09:30 AM	#3 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	I'm assuming you didn't install some whistle tips? ScottOmatic likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

05-10-2014, 09:46 AM	#4 (permalink)
Zteve Enthusiast Member Join Date: Jul 2013 Location: Clarksville TN Posts: 348 Drives: 2013 370Z MB w/Sport Rep Power: 3369	turn up the stereo. problem solved __________________ 2013 Midnight Blue 370Z Base w/Sport Package

05-10-2014, 10:03 AM	#5 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	I'd try the piece-of-tubing-stuck-to-the-ear trick to try to locate where the whistle is coming from. With the tubing "amplifying" the sound, you may be able to hear it just by revving the engine. Once you know which part(s) is causing the problem, you can look for specific solutions. SterlingDrive likes this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

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05-10-2014, 09:13 AM	#2 (permalink)
KB2 Base Member Join Date: Apr 2010 Location: Illinois Posts: 243 Drives: 370z Rep Power: 15	I should also say what my breather mods are; Motordyne m370 intake manifold Smooth tubes and filters ppe long tube headers Exhaust- and custom up rev dyno tune.

05-10-2014, 05:43 PM	#6 (permalink)
zefaulter A True Z Fanatic Join Date: Jan 2013 Location: Toronto, Canada Posts: 1,983 Drives: 40th 370Z Rep Power: 27	Are you lowered? Did you scrape the hks? Maybe it has a tiny crack somewhere

05-10-2014, 07:03 PM	#7 (permalink)
KB2 Base Member Join Date: Apr 2010 Location: Illinois Posts: 243 Drives: 370z Rep Power: 15	I am lowered...but not enough to damage it, that is a good thought. It's currently off the car, looks perfect

05-10-2014, 08:00 PM	#8 (permalink)
H2O_Doc A True Z Fanatic Join Date: Apr 2013 Location: Northern VA Posts: 1,083 Drives: '14 370Z, '12 4Runr Rep Power: 14	I sometimes whistle when I'm happy. Maybe your car is just happy? Now, if it starts yodeling, definitely get it checked out.