Cold starts : engine / exhaust sound

245kW · 11-18-2010, 06:29 AM

How does everyone else's 370 sound on the first cold start? Mine sounds extremely loud, like an amplified V8 hollow rumble - more from the front of the car rather than the rear muffler. Lasts for about 15 - 20secs then as the revs drop it's extremely quiet. Is that normal or consistent with other 370's?

VaGntlmn · 11-18-2010, 08:02 AM

Mine does the same thing. I think it just takes her a minute to wake up and get going.
Actually I think it has more to do with the ecu getting adjusted when she first starts.

m4a1mustang · 11-18-2010, 08:21 AM

It's very normal. On a cold start the ECU is programmed for a high-idle to get fluids pumping and the engine warmed up. Enjoy it.

esfourteen · 11-18-2010, 12:26 PM

Yeah cold starts are unusually loud on this car, nothing to worry about.

fuct · 11-18-2010, 02:00 PM

i concur. loud and rough!

theDreamer · 11-18-2010, 02:02 PM

Loud, pfht mine is dead silent.
Long tube headers with 12" resonators, dead quiet.

370zsport09 · 11-18-2010, 02:06 PM

I wish it was COLD every morning

I like how the sound is even louder in the Garage

"Tell my neighbors its time to WAKE UP"

504 370z · 11-18-2010, 02:21 PM

the gf's g37 is louder than my Z on cold starts

Cleto · 11-18-2010, 04:14 PM

Mine at first is very quite, then it starts to do like a pouring sound after, you can hear like a miooooouuuuuuuuu sound all day!

christian370z · 11-18-2010, 06:52 PM

I love cold starts on this car; I wish it sounded like that all the time, really deep and burly.

sonic370 · 11-18-2010, 06:55 PM

same here loud at start up then settles down in about 10 sec.

245kW · 11-18-2010, 07:29 PM

Ok cool, sounds like most people are on the same boat - must be normal then. Thought it might have been loose flanges or leaking gaskets at first.

Jamaica · 11-18-2010, 07:34 PM

Quote:

Originally Posted by esfourteen

Yeah cold starts are unusually loud on this car, nothing to worry about.

SouthArk370Z · 12-11-2010, 02:29 PM

. Mine does the same thing - sounds like an exhaust leak near the rear of the engine (I haven't been able to pinpoint exact location, so that may be way off) until fast idle starts backing down.
. OK. I'll believe that it's normal, but what causes it? Is there a simple and easy way to make it quieter?

DIGItonium · 12-12-2010, 01:13 AM

When I had the Berk HFC with the TDX 12", it was like waking up an angry bear every morning and after work. It rattles the garage door, window, and loose objects.

11-18-2010, 06:29 AM	#1 (permalink)
245kW Base Member Join Date: Oct 2010 Location: Melbourne, Australia Posts: 8 Drives: 370Z Rep Power: 14	Cold starts : engine / exhaust sound How does everyone else's 370 sound on the first cold start? Mine sounds extremely loud, like an amplified V8 hollow rumble - more from the front of the car rather than the rear muffler. Lasts for about 15 - 20secs then as the revs drop it's extremely quiet. Is that normal or consistent with other 370's?

11-18-2010, 08:02 AM	#2 (permalink)
VaGntlmn Enthusiast Member Join Date: May 2010 Location: Centreville, Va Age: 63 Posts: 377 Drives: '10 Tour/Sport, 6MT Rep Power: 14	Mine does the same thing. I think it just takes her a minute to wake up and get going. Actually I think it has more to do with the ecu getting adjusted when she first starts. __________________ Bill 2010 370z; Tour/Sport; 6mt; BlackCherry/Grey; 318 rwhp; 265 lbs rwtq. To view a list of my mods, click here; To view a photo journal of the mods, click here.

11-18-2010, 08:21 AM	#3 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	It's very normal. On a cold start the ECU is programmed for a high-idle to get fluids pumping and the engine warmed up. Enjoy it. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

11-18-2010, 12:26 PM	#4 (permalink)
esfourteen A True Z Fanatic Join Date: Mar 2010 Location: LI, NY Posts: 1,375 Drives: 40th TT Rep Power: 18	Yeah cold starts are unusually loud on this car, nothing to worry about. __________________ Build Thread \| GTM TT Install Thread \| Engine Build Thread

11-18-2010, 02:02 PM	#6 (permalink)
theDreamer A True Z Fanatic Join Date: Feb 2009 Location: Texas Posts: 30,879 Drives: 370z Rep Power: 4210	Loud, pfht mine is dead silent. Long tube headers with 12" resonators, dead quiet. __________________ theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN theDreamer's Silvia // URAS // GREDDY Houston Zs // Facebook // Twitter // Instagram

11-18-2010, 02:00 PM	#5 (permalink)
fuct A True Z Fanatic Join Date: May 2009 Location: Sugar Land Posts: 3,692 Drives: 97' Ranger :) Rep Power: 23	i concur. loud and rough!

11-18-2010, 02:06 PM	#7 (permalink)
370zsport09 Base Member Join Date: Apr 2010 Location: san antonio Posts: 195 Drives: 2011 Tacoma SR5 Rep Power: 15	I wish it was COLD every morning I like how the sound is even louder in the Garage "Tell my neighbors its time to WAKE UP"

11-18-2010, 02:21 PM	#8 (permalink)
504 370z Base Member Join Date: May 2010 Location: new orleans Posts: 44 Drives: 370z m6 g37 a5 Rep Power: 14	the gf's g37 is louder than my Z on cold starts

11-18-2010, 04:14 PM	#9 (permalink)
Cleto Base Member Join Date: Oct 2010 Location: riverside Posts: 16 Drives: 370z Rep Power: 14	Mine at first is very quite, then it starts to do like a pouring sound after, you can hear like a miooooouuuuuuuuu sound all day!

11-18-2010, 06:52 PM	#10 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 431	I love cold starts on this car; I wish it sounded like that all the time, really deep and burly. ajm216 likes this. __________________ -320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

11-18-2010, 06:55 PM	#11 (permalink)
sonic370 A True Z Fanatic Join Date: May 2010 Location: Orange Texas Posts: 1,574 Drives: 09 370Z Sports PGK Rep Power: 18	same here loud at start up then settles down in about 10 sec.

11-18-2010, 07:29 PM	#12 (permalink)
245kW Base Member Join Date: Oct 2010 Location: Melbourne, Australia Posts: 8 Drives: 370Z Rep Power: 14	Ok cool, sounds like most people are on the same boat - must be normal then. Thought it might have been loose flanges or leaking gaskets at first.

12-11-2010, 02:29 PM	#14 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	. Mine does the same thing - sounds like an exhaust leak near the rear of the engine (I haven't been able to pinpoint exact location, so that may be way off) until fast idle starts backing down. . OK. I'll believe that it's normal, but what causes it? Is there a simple and easy way to make it quieter?

12-12-2010, 01:13 AM	#15 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	When I had the Berk HFC with the TDX 12", it was like waking up an angry bear every morning and after work. It rattles the garage door, window, and loose objects. __________________

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