Ok so i'm a noob and....

mishuko · 07-28-2015, 06:14 PM

So driving home today it was a pretty humid 34*c... or 93F for you muricans.

Car oil temp goes above 100*c (212f) and I start noticing some lag/timing pull and more pronounced at 110*c (230f) which is cool since that's normal but the real question is this:

Is it normal for your exhaust to sound louder as it gets hotter? Especially in the 1.5-2.5k range? I found that it was deeper/louder than normal as if the car was warming up.

birdman71 · 07-28-2015, 06:59 PM

Almost the exact opposite with my car. When it is cold/warming up my exhaust is louder at an idle and while going, but when my car is warm/normal, between 210F-220F, when I am idle it is almost silent but there is a slight sound and when I'm going it is loud.

SouthArk370Z · 07-29-2015, 11:14 AM

The loss of power probably has more to do with IAT than coolant temp. The ECM starts pulling ignition timing, &c, at around 90F IAT. IAT is usually a few degrees above ambient when cruising and can be 20F or more higher when sitting at a stop.

My _guess_ is that the changes made to reduce power are causing the change in exhaust sound level. Maybe the exhaust valves are opening sooner/longer to reduce effective compression.

kenchan · 07-29-2015, 11:18 AM

^^ wat he said.

/thread

mishuko · 07-29-2015, 11:49 AM

Thanks! Makes sense

kenchan · 07-29-2015, 12:04 PM

now delete the tread pls..

FPenvy · 07-29-2015, 12:12 PM

Quote:

Originally Posted by mishuko

So driving home today it was a pretty humid 34*c... or 93F for you muricans.

Car oil temp goes above 100*c (212f) and I start noticing some lag/timing pull and more pronounced at 110*c (230f) which is cool since that's normal but the real question is this:

Is it normal for your exhaust to sound louder as it gets hotter? Especially in the 1.5-2.5k range? I found that it was deeper/louder than normal as if the car was warming up.

is your AC on? being that hot I would assume yes.

engine runs harder when AC is on meaning louder exhaust when at idle.

JARblue · 07-29-2015, 12:26 PM

Quote:

Originally Posted by FPenvy

is your AC on? being that hot I would assume yes.

engine runs harder when AC is on meaning louder exhaust when at idle.

In my experience, the AC can help with IATs because the radiator fans turn on. I'm sure there's a difference between running it at the lowest setting and full blast. I usually had my windows down and AC off altogether, so I if I needed to run the fans, I would turn it on low with the AC off. Now I have a tune that kicks the fans on at a cooler temp than stock. I think without the tune adjustment you are more likely to encounter high enough IATs to pull timing, even though oil temps aren't anywhere near high enough to pull timing, without the AC on than you are with it on. But that's just my uneducated guess.

I need to start turning my AC on full blast for better idle sounds

FPenvy · 07-29-2015, 12:27 PM

Quote:

Originally Posted by JARblue

In my experience, the AC can help with IATs because the radiator fans turn on. I'm sure there's a difference between running it at the lowest setting and full blast. I usually had my windows down and AC off altogether, so I if I needed to run the fans, I would turn it on low with the AC off. Now I have a tune that kicks the fans on at a cooler temp than stock. I think without the tune adjustment you are more likely to encounter high enough IATs to pull timing, even though oil temps aren't anywhere near high enough to pull timing, without the AC on than you are with it on. But that's just my uneducated guess.

I need to start turning my AC on full blast for better idle sounds

too technical.

I was just saying its 93 out so the AC is most likely on hence his louder exhaust lol

JARblue · 07-29-2015, 12:29 PM

Quote:

Originally Posted by FPenvy

too technical.

I was just saying its 93 out so the AC is most likely on hence his louder exhaust lol

It's 100F here. No AC

07-28-2015, 06:14 PM	#1 (permalink)
mishuko A True Z Fanatic Join Date: Jul 2014 Location: bouncin on tigga Posts: 8,062 Drives: '12 Z Rep Power: 9435	Ok so i'm a noob and.... So driving home today it was a pretty humid 34c... or 93F for you muricans. Car oil temp goes above 100c (212f) and I start noticing some lag/timing pull and more pronounced at 110*c (230f) which is cool since that's normal but the real question is this: Is it normal for your exhaust to sound louder as it gets hotter? Especially in the 1.5-2.5k range? I found that it was deeper/louder than normal as if the car was warming up.

07-28-2015, 06:59 PM	#2 (permalink)
birdman71 A True Z Fanatic Join Date: Apr 2015 Location: Los Angeles, CA Posts: 1,579 Drives: People Crazy! Rep Power: 40	Almost the exact opposite with my car. When it is cold/warming up my exhaust is louder at an idle and while going, but when my car is warm/normal, between 210F-220F, when I am idle it is almost silent but there is a slight sound and when I'm going it is loud. __________________ *Birdman's Build:* Powerhouse Amuse/ Nismo/ Eibach/ ACT/ Tommy Kaira/ Avant Garde/ Fast Intentions/ Project Kics/ Fly 1 Motorsports/ EVO-R/ Z1 Motorsports/ Weber Sports/ Zoom/ Zele Japan

07-29-2015, 11:14 AM	#3 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	The loss of power probably has more to do with IAT than coolant temp. The ECM starts pulling ignition timing, &c, at around 90F IAT. IAT is usually a few degrees above ambient when cruising and can be 20F or more higher when sitting at a stop. My _guess_ is that the changes made to reduce power are causing the change in exhaust sound level. Maybe the exhaust valves are opening sooner/longer to reduce effective compression. JARblue 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 Last edited by SouthArk370Z; 07-29-2015 at 11:53 AM.

07-29-2015, 11:18 AM	#4 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	^^ wat he said. /thread njobe89 and birdman71 like this.

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07-29-2015, 11:49 AM	#5 (permalink)
mishuko A True Z Fanatic Join Date: Jul 2014 Location: bouncin on tigga Posts: 8,062 Drives: '12 Z Rep Power: 9435	Thanks! Makes sense

07-29-2015, 12:04 PM	#6 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	now delete the tread pls..