Exhaust Leak or just a sound I have to live with?

Kandy OrangeZ · 05-02-2012, 07:40 PM

I just installed a set of Berk non resonated test pipes along with my F.I. CBE that Ive had. Under Load Im getting a raspy noise from what sounds like under the car. On deaccelration, it makes a sucking sound...almost like an open wastegate. It doesnt sound like a typical exhaust leak sound so thats why im asking...is this common with tp's? Or do i have a leak?

edub370 · 05-02-2012, 07:45 PM

almost like a hiss??

Kandy OrangeZ · 05-02-2012, 07:46 PM

yes, but not from the rear.

Staples · 05-02-2012, 10:21 PM

You can check everything over again and make sure there aren't any leaks. Otherwise it's resonance from lack of restriction. A lot of exhausts do that, especially when you had test pipes or high flow cats to the mix.

6MT · 05-02-2012, 10:23 PM

Quote:

Originally Posted by Kandy OrangeZ

yes, but not from the rear.

Normal.

reldas · 05-02-2012, 10:34 PM

i currently have stillen hfc and FI exhasut and i get the hiss on decel and a hiss on high load accel. i am going to swtich my HFC to FI resonated HFC to try fix it a bit. becaus eon accel the hiss is extremely annoying. and i got my mechanic to look it over and there are no leaks

Staples · 05-03-2012, 12:49 AM

Quote:

Originally Posted by reldas

i currently have stillen hfc and FI exhasut and i get the hiss on decel and a hiss on high load accel. i am going to swtich my HFC to FI resonated HFC to try fix it a bit. becaus eon accel the hiss is extremely annoying. and i got my mechanic to look it over and there are no leaks

It's not going to fix it. I had resonated cat pipes and resonated test pipes. You're better off using exhaust wrap, that will minimize it.

Kandy OrangeZ · 05-03-2012, 02:38 AM

Damn that sucks! I mainly work on Z32's and they dont have that problem :/
The sound really is annoying too, do FI's LTH's create that sound also?

Kandy OrangeZ · 05-03-2012, 02:38 AM

Quote:

Originally Posted by Staples

It's not going to fix it. I had resonated cat pipes and resonated test pipes. You're better off using exhaust wrap, that will minimize it.

Wrap just the test pipes?

SS_Firehawk · 05-03-2012, 08:25 AM

Test pipes will definitely rasp a lot like you mentioned. Header wrap around the TP is a good inexpensive solution. Next best thing is look for something resonated if you are still unhappy with it. Regarding headers, they do have a much cleaner sound. My PPE's rasp but with a HFC, it's very minimal now. I haven't really heard any with the F.I. LTH's. Either way, it's an expensive upgrade from TP's to gain maybe 5whp.

scottIN · 05-04-2012, 04:29 AM

What causes the hiss on decel? I only hear it if I'm sitting still and revving it and let off quick-not on the open road. So it really doesn't bother me - just curious. I've got FI resonated CBE and 18" resonated HFCs.

SS_Firehawk · 05-04-2012, 10:52 AM

I don't get hissing on decel with my LTH's. Not sure about the F.I. headers. I only get a small hint of rasp, but its masked by scavenging. It might originate from the factory header design, idk, I'm only guessing from my limited experience.

erkthejerk73 · 05-04-2012, 11:32 AM

does it sound like this?

Kandy OrangeZ · 05-04-2012, 12:23 PM

^ Yes it does, just reving, on accelaration and decel

Staples · 05-04-2012, 02:23 PM

Quote:

Originally Posted by Kandy OrangeZ

^ Yes it does, just reving, on accelaration and decel

Very normal, unfortunately. You could exhaust wrap the test pipes and x-pipe to break some of the resonance. It does work, I've done it on two different exhaust set-ups.

05-02-2012, 07:40 PM	#1 (permalink)
Kandy OrangeZ Enthusiast Member Join Date: Mar 2011 Location: Jackson Posts: 268 Drives: 2010 370Z sport Rep Power: 14	Exhaust Leak or just a sound I have to live with? I just installed a set of Berk non resonated test pipes along with my F.I. CBE that Ive had. Under Load Im getting a raspy noise from what sounds like under the car. On deaccelration, it makes a sucking sound...almost like an open wastegate. It doesnt sound like a typical exhaust leak sound so thats why im asking...is this common with tp's? Or do i have a leak? __________________ If you even dream of beating me, you better wake up and apologize.

05-02-2012, 07:45 PM	#2 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 19	almost like a hiss?? __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

05-02-2012, 07:46 PM	#3 (permalink)
Kandy OrangeZ Enthusiast Member Join Date: Mar 2011 Location: Jackson Posts: 268 Drives: 2010 370Z sport Rep Power: 14	yes, but not from the rear. __________________ If you even dream of beating me, you better wake up and apologize.

05-02-2012, 10:21 PM	#4 (permalink)
Staples Track Member Join Date: Sep 2010 Location: Baltimore, MD Posts: 546 Drives: '08 Infiniti G37s Rep Power: 15	You can check everything over again and make sure there aren't any leaks. Otherwise it's resonance from lack of restriction. A lot of exhausts do that, especially when you had test pipes or high flow cats to the mix. __________________ '08 Infiniti G37s - Forced Induction Fed

05-03-2012, 02:38 AM	#8 (permalink)
Kandy OrangeZ Enthusiast Member Join Date: Mar 2011 Location: Jackson Posts: 268 Drives: 2010 370Z sport Rep Power: 14	Damn that sucks! I mainly work on Z32's and they dont have that problem :/ The sound really is annoying too, do FI's LTH's create that sound also? __________________ If you even dream of beating me, you better wake up and apologize.

05-02-2012, 10:34 PM	#6 (permalink)
reldas Base Member Join Date: Aug 2011 Location: Sydney Posts: 144 Drives: 09 Nissan 370z auto Rep Power: 13	i currently have stillen hfc and FI exhasut and i get the hiss on decel and a hiss on high load accel. i am going to swtich my HFC to FI resonated HFC to try fix it a bit. becaus eon accel the hiss is extremely annoying. and i got my mechanic to look it over and there are no leaks

05-03-2012, 08:25 AM	#10 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7334	Test pipes will definitely rasp a lot like you mentioned. Header wrap around the TP is a good inexpensive solution. Next best thing is look for something resonated if you are still unhappy with it. Regarding headers, they do have a much cleaner sound. My PPE's rasp but with a HFC, it's very minimal now. I haven't really heard any with the F.I. LTH's. Either way, it's an expensive upgrade from TP's to gain maybe 5whp. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

05-04-2012, 04:29 AM	#11 (permalink)
scottIN Track Member Join Date: Aug 2011 Location: New Castle, Indiana Posts: 764 Drives: '12 370Z Rep Power: 54	What causes the hiss on decel? I only hear it if I'm sitting still and revving it and let off quick-not on the open road. So it really doesn't bother me - just curious. I've got FI resonated CBE and 18" resonated HFCs.

05-04-2012, 10:52 AM	#12 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7334	I don't get hissing on decel with my LTH's. Not sure about the F.I. headers. I only get a small hint of rasp, but its masked by scavenging. It might originate from the factory header design, idk, I'm only guessing from my limited experience. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

05-04-2012, 11:32 AM	#13 (permalink)
erkthejerk73 Track Member Join Date: Mar 2011 Location: cincinnati Posts: 927 Drives: 13 F150 FX4 eb Rep Power: 15	does it sound like this?

05-04-2012, 12:23 PM	#14 (permalink)
Kandy OrangeZ Enthusiast Member Join Date: Mar 2011 Location: Jackson Posts: 268 Drives: 2010 370Z sport Rep Power: 14	^ Yes it does, just reving, on accelaration and decel __________________ If you even dream of beating me, you better wake up and apologize.

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