Exhaust "Pop" noise

delusional · 11-21-2011, 06:29 PM

Lately ive been noticing that when I let off the gas, sometimes i'll hear a "pop" sound coming from the exhaust. Is this normal? I have the berk tp & berk cbe.

Skeeterbop · 11-21-2011, 06:31 PM

Given your exhaust setup I would venture to say that it is to be expected. Somebody with more experience can confirm.

haitech · 11-21-2011, 06:34 PM

backfiring?

VQStryker · 11-21-2011, 08:19 PM

Your just running a little rich. Backfire is caused from unburned fuel or bad spark plugs or timing. A tune or intake should help. Try looking at your plugs too. If your untuned then I wouldn't say its the timing which can also be a cause. A too "retarded" set timing will also cause backfire. Fuel injectors spraying fuel after cylinder has already combusted is another but that's not going to be it either. If i mixed anything up Feel free to correct me.

MattP725 · 11-21-2011, 08:29 PM

It is actually most likely backpressure, nothing to do with timing. I don't hear it with my current setup but had CB's on other cars that produce it...

Normal, don't worry. I actually get a fair amount of hiss when I let off the gas so you probably just have more backpressure suction with the TPs.

delusional · 11-21-2011, 08:47 PM

yeah i'm not tuned at all so i probably am running a bit rich. ok so as long as its not something that i should worry too much its fine i dont really mind it. thanks for help guys

jaycz · 11-21-2011, 08:48 PM

You might check for an exhaust leak. This can cause back firing when you back off the gas.

VQStryker · 11-21-2011, 09:13 PM

Quote:

Originally Posted by delusional

yeah i'm not tuned at all so i probably am running a bit rich. ok so as long as its not something that i should worry too much its fine i dont really mind it. thanks for help guys

Always remember that being too rich is almost as bad as being too lean. you can bend an exhaust valves, burn your piston oil rings, and foul plugs. don't worry you won't be that rich from exhaust mods, that's more of a just so you know thing

Will@Logic · 11-21-2011, 10:15 PM

Quote:

Originally Posted by delusional

Lately ive been noticing that when I let off the gas, sometimes i'll hear a "pop" sound coming from the exhaust. Is this normal? I have the berk tp & berk cbe.

Sounds like a little back fire. Not uncommon with an unrestricted exhaust system.

m4a1mustang · 11-21-2011, 10:22 PM

Quote:

Originally Posted by Will@Logic

Sounds like a little back fire. Not uncommon with an unrestricted exhaust system.

GaleForce · 11-21-2011, 10:34 PM

Quote:

Originally Posted by Will@Logic

Sounds like a little back fire. Not uncommon with an unrestricted exhaust system.

Quote:

Originally Posted by m4a1mustang

this 100%

I have a similar set-up ( Berk HFC and CBE). I am also tuned, I had/have the "pops" before and after. It's just because the exhaust is so unrestrictive like Will said. This was also confirmed by my tuner (Sasha at SG Motorsports) he knows his Nissan's!

11-21-2011, 06:29 PM	#1 (permalink)
delusional Track Member Join Date: Feb 2011 Location: NewYork Posts: 968 Drives: 09 PG T/S/N 7AT Rep Power: 15	Exhaust "Pop" noise Lately ive been noticing that when I let off the gas, sometimes i'll hear a "pop" sound coming from the exhaust. Is this normal? I have the berk tp & berk cbe. __________________ 2009 Platinum Graphite Touring [ Sport Package ¦¦ Navigation ¦¦ 7 Speed Automatic ] [ Berk ¦ H&R ¦ ONEighty ¦ K&N ¦ Stillen ¦ Eibach ¦ Cobb ¦ Ichiba ¦ Hankook ]

11-21-2011, 06:31 PM	#2 (permalink)
Skeeterbop A True Z Fanatic Join Date: Jan 2011 Location: Fort Bliss, TX Age: 40 Posts: 1,440 Drives: 2011 GM 370 base SP Rep Power: 16	Given your exhaust setup I would venture to say that it is to be expected. Somebody with more experience can confirm. __________________ Srenity: "Yeah no rest needed to spread the love when your 20 that's for sure...."

11-21-2011, 08:19 PM	#4 (permalink)
VQStryker Track Member Join Date: Jul 2011 Location: Texas Age: 36 Posts: 659 Drives: :( Rep Power: 15	Your just running a little rich. Backfire is caused from unburned fuel or bad spark plugs or timing. A tune or intake should help. Try looking at your plugs too. If your untuned then I wouldn't say its the timing which can also be a cause. A too "retarded" set timing will also cause backfire. Fuel injectors spraying fuel after cylinder has already combusted is another but that's not going to be it either. If i mixed anything up Feel free to correct me. Last edited by VQStryker; 11-21-2011 at 08:21 PM.

11-21-2011, 08:47 PM	#6 (permalink)
delusional Track Member Join Date: Feb 2011 Location: NewYork Posts: 968 Drives: 09 PG T/S/N 7AT Rep Power: 15	yeah i'm not tuned at all so i probably am running a bit rich. ok so as long as its not something that i should worry too much its fine i dont really mind it. thanks for help guys __________________ 2009 Platinum Graphite Touring [ Sport Package ¦¦ Navigation ¦¦ 7 Speed Automatic ] [ Berk ¦ H&R ¦ ONEighty ¦ K&N ¦ Stillen ¦ Eibach ¦ Cobb ¦ Ichiba ¦ Hankook ]

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11-21-2011, 06:34 PM	#3 (permalink)
haitech Track Member Join Date: Sep 2011 Location: Austin/Dallas Posts: 922 Drives: 11' 370z Magnetic M6 Rep Power: 15	backfiring?

11-21-2011, 08:29 PM	#5 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 17	It is actually most likely backpressure, nothing to do with timing. I don't hear it with my current setup but had CB's on other cars that produce it... Normal, don't worry. I actually get a fair amount of hiss when I let off the gas so you probably just have more backpressure suction with the TPs.

11-21-2011, 08:48 PM	#7 (permalink)
jaycz Base Member Join Date: Aug 2010 Location: Oregon Posts: 189 Drives: 09 370z Tour Red 6MT Rep Power: 15	You might check for an exhaust leak. This can cause back firing when you back off the gas.